1 //===-- TargetLowering.cpp - Implement the TargetLowering class -----------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This implements the TargetLowering class.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/Target/TargetAsmInfo.h"
15 #include "llvm/Target/TargetLowering.h"
16 #include "llvm/Target/TargetSubtarget.h"
17 #include "llvm/Target/TargetData.h"
18 #include "llvm/Target/TargetMachine.h"
19 #include "llvm/Target/TargetRegisterInfo.h"
20 #include "llvm/GlobalVariable.h"
21 #include "llvm/DerivedTypes.h"
22 #include "llvm/CodeGen/MachineFrameInfo.h"
23 #include "llvm/CodeGen/SelectionDAG.h"
24 #include "llvm/ADT/StringExtras.h"
25 #include "llvm/ADT/STLExtras.h"
26 #include "llvm/Support/MathExtras.h"
29 /// InitLibcallNames - Set default libcall names.
31 static void InitLibcallNames(const char **Names) {
32 Names[RTLIB::SHL_I16] = "__ashli16";
33 Names[RTLIB::SHL_I32] = "__ashlsi3";
34 Names[RTLIB::SHL_I64] = "__ashldi3";
35 Names[RTLIB::SHL_I128] = "__ashlti3";
36 Names[RTLIB::SRL_I16] = "__lshri16";
37 Names[RTLIB::SRL_I32] = "__lshrsi3";
38 Names[RTLIB::SRL_I64] = "__lshrdi3";
39 Names[RTLIB::SRL_I128] = "__lshrti3";
40 Names[RTLIB::SRA_I16] = "__ashri16";
41 Names[RTLIB::SRA_I32] = "__ashrsi3";
42 Names[RTLIB::SRA_I64] = "__ashrdi3";
43 Names[RTLIB::SRA_I128] = "__ashrti3";
44 Names[RTLIB::MUL_I16] = "__muli16";
45 Names[RTLIB::MUL_I32] = "__mulsi3";
46 Names[RTLIB::MUL_I64] = "__muldi3";
47 Names[RTLIB::MUL_I128] = "__multi3";
48 Names[RTLIB::SDIV_I32] = "__divsi3";
49 Names[RTLIB::SDIV_I64] = "__divdi3";
50 Names[RTLIB::SDIV_I128] = "__divti3";
51 Names[RTLIB::UDIV_I32] = "__udivsi3";
52 Names[RTLIB::UDIV_I64] = "__udivdi3";
53 Names[RTLIB::UDIV_I128] = "__udivti3";
54 Names[RTLIB::SREM_I32] = "__modsi3";
55 Names[RTLIB::SREM_I64] = "__moddi3";
56 Names[RTLIB::SREM_I128] = "__modti3";
57 Names[RTLIB::UREM_I32] = "__umodsi3";
58 Names[RTLIB::UREM_I64] = "__umoddi3";
59 Names[RTLIB::UREM_I128] = "__umodti3";
60 Names[RTLIB::NEG_I32] = "__negsi2";
61 Names[RTLIB::NEG_I64] = "__negdi2";
62 Names[RTLIB::ADD_F32] = "__addsf3";
63 Names[RTLIB::ADD_F64] = "__adddf3";
64 Names[RTLIB::ADD_F80] = "__addxf3";
65 Names[RTLIB::ADD_PPCF128] = "__gcc_qadd";
66 Names[RTLIB::SUB_F32] = "__subsf3";
67 Names[RTLIB::SUB_F64] = "__subdf3";
68 Names[RTLIB::SUB_F80] = "__subxf3";
69 Names[RTLIB::SUB_PPCF128] = "__gcc_qsub";
70 Names[RTLIB::MUL_F32] = "__mulsf3";
71 Names[RTLIB::MUL_F64] = "__muldf3";
72 Names[RTLIB::MUL_F80] = "__mulxf3";
73 Names[RTLIB::MUL_PPCF128] = "__gcc_qmul";
74 Names[RTLIB::DIV_F32] = "__divsf3";
75 Names[RTLIB::DIV_F64] = "__divdf3";
76 Names[RTLIB::DIV_F80] = "__divxf3";
77 Names[RTLIB::DIV_PPCF128] = "__gcc_qdiv";
78 Names[RTLIB::REM_F32] = "fmodf";
79 Names[RTLIB::REM_F64] = "fmod";
80 Names[RTLIB::REM_F80] = "fmodl";
81 Names[RTLIB::REM_PPCF128] = "fmodl";
82 Names[RTLIB::POWI_F32] = "__powisf2";
83 Names[RTLIB::POWI_F64] = "__powidf2";
84 Names[RTLIB::POWI_F80] = "__powixf2";
85 Names[RTLIB::POWI_PPCF128] = "__powitf2";
86 Names[RTLIB::SQRT_F32] = "sqrtf";
87 Names[RTLIB::SQRT_F64] = "sqrt";
88 Names[RTLIB::SQRT_F80] = "sqrtl";
89 Names[RTLIB::SQRT_PPCF128] = "sqrtl";
90 Names[RTLIB::LOG_F32] = "logf";
91 Names[RTLIB::LOG_F64] = "log";
92 Names[RTLIB::LOG_F80] = "logl";
93 Names[RTLIB::LOG_PPCF128] = "logl";
94 Names[RTLIB::LOG2_F32] = "log2f";
95 Names[RTLIB::LOG2_F64] = "log2";
96 Names[RTLIB::LOG2_F80] = "log2l";
97 Names[RTLIB::LOG2_PPCF128] = "log2l";
98 Names[RTLIB::LOG10_F32] = "log10f";
99 Names[RTLIB::LOG10_F64] = "log10";
100 Names[RTLIB::LOG10_F80] = "log10l";
101 Names[RTLIB::LOG10_PPCF128] = "log10l";
102 Names[RTLIB::EXP_F32] = "expf";
103 Names[RTLIB::EXP_F64] = "exp";
104 Names[RTLIB::EXP_F80] = "expl";
105 Names[RTLIB::EXP_PPCF128] = "expl";
106 Names[RTLIB::EXP2_F32] = "exp2f";
107 Names[RTLIB::EXP2_F64] = "exp2";
108 Names[RTLIB::EXP2_F80] = "exp2l";
109 Names[RTLIB::EXP2_PPCF128] = "exp2l";
110 Names[RTLIB::SIN_F32] = "sinf";
111 Names[RTLIB::SIN_F64] = "sin";
112 Names[RTLIB::SIN_F80] = "sinl";
113 Names[RTLIB::SIN_PPCF128] = "sinl";
114 Names[RTLIB::COS_F32] = "cosf";
115 Names[RTLIB::COS_F64] = "cos";
116 Names[RTLIB::COS_F80] = "cosl";
117 Names[RTLIB::COS_PPCF128] = "cosl";
118 Names[RTLIB::POW_F32] = "powf";
119 Names[RTLIB::POW_F64] = "pow";
120 Names[RTLIB::POW_F80] = "powl";
121 Names[RTLIB::POW_PPCF128] = "powl";
122 Names[RTLIB::CEIL_F32] = "ceilf";
123 Names[RTLIB::CEIL_F64] = "ceil";
124 Names[RTLIB::CEIL_F80] = "ceill";
125 Names[RTLIB::CEIL_PPCF128] = "ceill";
126 Names[RTLIB::TRUNC_F32] = "truncf";
127 Names[RTLIB::TRUNC_F64] = "trunc";
128 Names[RTLIB::TRUNC_F80] = "truncl";
129 Names[RTLIB::TRUNC_PPCF128] = "truncl";
130 Names[RTLIB::RINT_F32] = "rintf";
131 Names[RTLIB::RINT_F64] = "rint";
132 Names[RTLIB::RINT_F80] = "rintl";
133 Names[RTLIB::RINT_PPCF128] = "rintl";
134 Names[RTLIB::NEARBYINT_F32] = "nearbyintf";
135 Names[RTLIB::NEARBYINT_F64] = "nearbyint";
136 Names[RTLIB::NEARBYINT_F80] = "nearbyintl";
137 Names[RTLIB::NEARBYINT_PPCF128] = "nearbyintl";
138 Names[RTLIB::FLOOR_F32] = "floorf";
139 Names[RTLIB::FLOOR_F64] = "floor";
140 Names[RTLIB::FLOOR_F80] = "floorl";
141 Names[RTLIB::FLOOR_PPCF128] = "floorl";
142 Names[RTLIB::FPEXT_F32_F64] = "__extendsfdf2";
143 Names[RTLIB::FPROUND_F64_F32] = "__truncdfsf2";
144 Names[RTLIB::FPROUND_F80_F32] = "__truncxfsf2";
145 Names[RTLIB::FPROUND_PPCF128_F32] = "__trunctfsf2";
146 Names[RTLIB::FPROUND_F80_F64] = "__truncxfdf2";
147 Names[RTLIB::FPROUND_PPCF128_F64] = "__trunctfdf2";
148 Names[RTLIB::FPTOSINT_F32_I32] = "__fixsfsi";
149 Names[RTLIB::FPTOSINT_F32_I64] = "__fixsfdi";
150 Names[RTLIB::FPTOSINT_F32_I128] = "__fixsfti";
151 Names[RTLIB::FPTOSINT_F64_I32] = "__fixdfsi";
152 Names[RTLIB::FPTOSINT_F64_I64] = "__fixdfdi";
153 Names[RTLIB::FPTOSINT_F64_I128] = "__fixdfti";
154 Names[RTLIB::FPTOSINT_F80_I32] = "__fixxfsi";
155 Names[RTLIB::FPTOSINT_F80_I64] = "__fixxfdi";
156 Names[RTLIB::FPTOSINT_F80_I128] = "__fixxfti";
157 Names[RTLIB::FPTOSINT_PPCF128_I32] = "__fixtfsi";
158 Names[RTLIB::FPTOSINT_PPCF128_I64] = "__fixtfdi";
159 Names[RTLIB::FPTOSINT_PPCF128_I128] = "__fixtfti";
160 Names[RTLIB::FPTOUINT_F32_I32] = "__fixunssfsi";
161 Names[RTLIB::FPTOUINT_F32_I64] = "__fixunssfdi";
162 Names[RTLIB::FPTOUINT_F32_I128] = "__fixunssfti";
163 Names[RTLIB::FPTOUINT_F64_I32] = "__fixunsdfsi";
164 Names[RTLIB::FPTOUINT_F64_I64] = "__fixunsdfdi";
165 Names[RTLIB::FPTOUINT_F64_I128] = "__fixunsdfti";
166 Names[RTLIB::FPTOUINT_F80_I32] = "__fixunsxfsi";
167 Names[RTLIB::FPTOUINT_F80_I64] = "__fixunsxfdi";
168 Names[RTLIB::FPTOUINT_F80_I128] = "__fixunsxfti";
169 Names[RTLIB::FPTOUINT_PPCF128_I32] = "__fixunstfsi";
170 Names[RTLIB::FPTOUINT_PPCF128_I64] = "__fixunstfdi";
171 Names[RTLIB::FPTOUINT_PPCF128_I128] = "__fixunstfti";
172 Names[RTLIB::SINTTOFP_I32_F32] = "__floatsisf";
173 Names[RTLIB::SINTTOFP_I32_F64] = "__floatsidf";
174 Names[RTLIB::SINTTOFP_I32_F80] = "__floatsixf";
175 Names[RTLIB::SINTTOFP_I32_PPCF128] = "__floatsitf";
176 Names[RTLIB::SINTTOFP_I64_F32] = "__floatdisf";
177 Names[RTLIB::SINTTOFP_I64_F64] = "__floatdidf";
178 Names[RTLIB::SINTTOFP_I64_F80] = "__floatdixf";
179 Names[RTLIB::SINTTOFP_I64_PPCF128] = "__floatditf";
180 Names[RTLIB::SINTTOFP_I128_F32] = "__floattisf";
181 Names[RTLIB::SINTTOFP_I128_F64] = "__floattidf";
182 Names[RTLIB::SINTTOFP_I128_F80] = "__floattixf";
183 Names[RTLIB::SINTTOFP_I128_PPCF128] = "__floattitf";
184 Names[RTLIB::UINTTOFP_I32_F32] = "__floatunsisf";
185 Names[RTLIB::UINTTOFP_I32_F64] = "__floatunsidf";
186 Names[RTLIB::UINTTOFP_I32_F80] = "__floatunsixf";
187 Names[RTLIB::UINTTOFP_I32_PPCF128] = "__floatunsitf";
188 Names[RTLIB::UINTTOFP_I64_F32] = "__floatundisf";
189 Names[RTLIB::UINTTOFP_I64_F64] = "__floatundidf";
190 Names[RTLIB::UINTTOFP_I64_F80] = "__floatundixf";
191 Names[RTLIB::UINTTOFP_I64_PPCF128] = "__floatunditf";
192 Names[RTLIB::UINTTOFP_I128_F32] = "__floatuntisf";
193 Names[RTLIB::UINTTOFP_I128_F64] = "__floatuntidf";
194 Names[RTLIB::UINTTOFP_I128_F80] = "__floatuntixf";
195 Names[RTLIB::UINTTOFP_I128_PPCF128] = "__floatuntitf";
196 Names[RTLIB::OEQ_F32] = "__eqsf2";
197 Names[RTLIB::OEQ_F64] = "__eqdf2";
198 Names[RTLIB::UNE_F32] = "__nesf2";
199 Names[RTLIB::UNE_F64] = "__nedf2";
200 Names[RTLIB::OGE_F32] = "__gesf2";
201 Names[RTLIB::OGE_F64] = "__gedf2";
202 Names[RTLIB::OLT_F32] = "__ltsf2";
203 Names[RTLIB::OLT_F64] = "__ltdf2";
204 Names[RTLIB::OLE_F32] = "__lesf2";
205 Names[RTLIB::OLE_F64] = "__ledf2";
206 Names[RTLIB::OGT_F32] = "__gtsf2";
207 Names[RTLIB::OGT_F64] = "__gtdf2";
208 Names[RTLIB::UO_F32] = "__unordsf2";
209 Names[RTLIB::UO_F64] = "__unorddf2";
210 Names[RTLIB::O_F32] = "__unordsf2";
211 Names[RTLIB::O_F64] = "__unorddf2";
214 /// getFPEXT - Return the FPEXT_*_* value for the given types, or
215 /// UNKNOWN_LIBCALL if there is none.
216 RTLIB::Libcall RTLIB::getFPEXT(MVT OpVT, MVT RetVT) {
217 if (OpVT == MVT::f32) {
218 if (RetVT == MVT::f64)
219 return FPEXT_F32_F64;
221 return UNKNOWN_LIBCALL;
224 /// getFPROUND - Return the FPROUND_*_* value for the given types, or
225 /// UNKNOWN_LIBCALL if there is none.
226 RTLIB::Libcall RTLIB::getFPROUND(MVT OpVT, MVT RetVT) {
227 if (RetVT == MVT::f32) {
228 if (OpVT == MVT::f64)
229 return FPROUND_F64_F32;
230 if (OpVT == MVT::f80)
231 return FPROUND_F80_F32;
232 if (OpVT == MVT::ppcf128)
233 return FPROUND_PPCF128_F32;
234 } else if (RetVT == MVT::f64) {
235 if (OpVT == MVT::f80)
236 return FPROUND_F80_F64;
237 if (OpVT == MVT::ppcf128)
238 return FPROUND_PPCF128_F64;
240 return UNKNOWN_LIBCALL;
243 /// getFPTOSINT - Return the FPTOSINT_*_* value for the given types, or
244 /// UNKNOWN_LIBCALL if there is none.
245 RTLIB::Libcall RTLIB::getFPTOSINT(MVT OpVT, MVT RetVT) {
246 if (OpVT == MVT::f32) {
247 if (RetVT == MVT::i32)
248 return FPTOSINT_F32_I32;
249 if (RetVT == MVT::i64)
250 return FPTOSINT_F32_I64;
251 if (RetVT == MVT::i128)
252 return FPTOSINT_F32_I128;
253 } else if (OpVT == MVT::f64) {
254 if (RetVT == MVT::i32)
255 return FPTOSINT_F64_I32;
256 if (RetVT == MVT::i64)
257 return FPTOSINT_F64_I64;
258 if (RetVT == MVT::i128)
259 return FPTOSINT_F64_I128;
260 } else if (OpVT == MVT::f80) {
261 if (RetVT == MVT::i32)
262 return FPTOSINT_F80_I32;
263 if (RetVT == MVT::i64)
264 return FPTOSINT_F80_I64;
265 if (RetVT == MVT::i128)
266 return FPTOSINT_F80_I128;
267 } else if (OpVT == MVT::ppcf128) {
268 if (RetVT == MVT::i32)
269 return FPTOSINT_PPCF128_I32;
270 if (RetVT == MVT::i64)
271 return FPTOSINT_PPCF128_I64;
272 if (RetVT == MVT::i128)
273 return FPTOSINT_PPCF128_I128;
275 return UNKNOWN_LIBCALL;
278 /// getFPTOUINT - Return the FPTOUINT_*_* value for the given types, or
279 /// UNKNOWN_LIBCALL if there is none.
280 RTLIB::Libcall RTLIB::getFPTOUINT(MVT OpVT, MVT RetVT) {
281 if (OpVT == MVT::f32) {
282 if (RetVT == MVT::i32)
283 return FPTOUINT_F32_I32;
284 if (RetVT == MVT::i64)
285 return FPTOUINT_F32_I64;
286 if (RetVT == MVT::i128)
287 return FPTOUINT_F32_I128;
288 } else if (OpVT == MVT::f64) {
289 if (RetVT == MVT::i32)
290 return FPTOUINT_F64_I32;
291 if (RetVT == MVT::i64)
292 return FPTOUINT_F64_I64;
293 if (RetVT == MVT::i128)
294 return FPTOUINT_F64_I128;
295 } else if (OpVT == MVT::f80) {
296 if (RetVT == MVT::i32)
297 return FPTOUINT_F80_I32;
298 if (RetVT == MVT::i64)
299 return FPTOUINT_F80_I64;
300 if (RetVT == MVT::i128)
301 return FPTOUINT_F80_I128;
302 } else if (OpVT == MVT::ppcf128) {
303 if (RetVT == MVT::i32)
304 return FPTOUINT_PPCF128_I32;
305 if (RetVT == MVT::i64)
306 return FPTOUINT_PPCF128_I64;
307 if (RetVT == MVT::i128)
308 return FPTOUINT_PPCF128_I128;
310 return UNKNOWN_LIBCALL;
313 /// getSINTTOFP - Return the SINTTOFP_*_* value for the given types, or
314 /// UNKNOWN_LIBCALL if there is none.
315 RTLIB::Libcall RTLIB::getSINTTOFP(MVT OpVT, MVT RetVT) {
316 if (OpVT == MVT::i32) {
317 if (RetVT == MVT::f32)
318 return SINTTOFP_I32_F32;
319 else if (RetVT == MVT::f64)
320 return SINTTOFP_I32_F64;
321 else if (RetVT == MVT::f80)
322 return SINTTOFP_I32_F80;
323 else if (RetVT == MVT::ppcf128)
324 return SINTTOFP_I32_PPCF128;
325 } else if (OpVT == MVT::i64) {
326 if (RetVT == MVT::f32)
327 return SINTTOFP_I64_F32;
328 else if (RetVT == MVT::f64)
329 return SINTTOFP_I64_F64;
330 else if (RetVT == MVT::f80)
331 return SINTTOFP_I64_F80;
332 else if (RetVT == MVT::ppcf128)
333 return SINTTOFP_I64_PPCF128;
334 } else if (OpVT == MVT::i128) {
335 if (RetVT == MVT::f32)
336 return SINTTOFP_I128_F32;
337 else if (RetVT == MVT::f64)
338 return SINTTOFP_I128_F64;
339 else if (RetVT == MVT::f80)
340 return SINTTOFP_I128_F80;
341 else if (RetVT == MVT::ppcf128)
342 return SINTTOFP_I128_PPCF128;
344 return UNKNOWN_LIBCALL;
347 /// getUINTTOFP - Return the UINTTOFP_*_* value for the given types, or
348 /// UNKNOWN_LIBCALL if there is none.
349 RTLIB::Libcall RTLIB::getUINTTOFP(MVT OpVT, MVT RetVT) {
350 if (OpVT == MVT::i32) {
351 if (RetVT == MVT::f32)
352 return UINTTOFP_I32_F32;
353 else if (RetVT == MVT::f64)
354 return UINTTOFP_I32_F64;
355 else if (RetVT == MVT::f80)
356 return UINTTOFP_I32_F80;
357 else if (RetVT == MVT::ppcf128)
358 return UINTTOFP_I32_PPCF128;
359 } else if (OpVT == MVT::i64) {
360 if (RetVT == MVT::f32)
361 return UINTTOFP_I64_F32;
362 else if (RetVT == MVT::f64)
363 return UINTTOFP_I64_F64;
364 else if (RetVT == MVT::f80)
365 return UINTTOFP_I64_F80;
366 else if (RetVT == MVT::ppcf128)
367 return UINTTOFP_I64_PPCF128;
368 } else if (OpVT == MVT::i128) {
369 if (RetVT == MVT::f32)
370 return UINTTOFP_I128_F32;
371 else if (RetVT == MVT::f64)
372 return UINTTOFP_I128_F64;
373 else if (RetVT == MVT::f80)
374 return UINTTOFP_I128_F80;
375 else if (RetVT == MVT::ppcf128)
376 return UINTTOFP_I128_PPCF128;
378 return UNKNOWN_LIBCALL;
381 /// InitCmpLibcallCCs - Set default comparison libcall CC.
383 static void InitCmpLibcallCCs(ISD::CondCode *CCs) {
384 memset(CCs, ISD::SETCC_INVALID, sizeof(ISD::CondCode)*RTLIB::UNKNOWN_LIBCALL);
385 CCs[RTLIB::OEQ_F32] = ISD::SETEQ;
386 CCs[RTLIB::OEQ_F64] = ISD::SETEQ;
387 CCs[RTLIB::UNE_F32] = ISD::SETNE;
388 CCs[RTLIB::UNE_F64] = ISD::SETNE;
389 CCs[RTLIB::OGE_F32] = ISD::SETGE;
390 CCs[RTLIB::OGE_F64] = ISD::SETGE;
391 CCs[RTLIB::OLT_F32] = ISD::SETLT;
392 CCs[RTLIB::OLT_F64] = ISD::SETLT;
393 CCs[RTLIB::OLE_F32] = ISD::SETLE;
394 CCs[RTLIB::OLE_F64] = ISD::SETLE;
395 CCs[RTLIB::OGT_F32] = ISD::SETGT;
396 CCs[RTLIB::OGT_F64] = ISD::SETGT;
397 CCs[RTLIB::UO_F32] = ISD::SETNE;
398 CCs[RTLIB::UO_F64] = ISD::SETNE;
399 CCs[RTLIB::O_F32] = ISD::SETEQ;
400 CCs[RTLIB::O_F64] = ISD::SETEQ;
403 TargetLowering::TargetLowering(TargetMachine &tm)
404 : TM(tm), TD(TM.getTargetData()) {
405 // All operations default to being supported.
406 memset(OpActions, 0, sizeof(OpActions));
407 memset(LoadExtActions, 0, sizeof(LoadExtActions));
408 memset(TruncStoreActions, 0, sizeof(TruncStoreActions));
409 memset(IndexedModeActions, 0, sizeof(IndexedModeActions));
410 memset(ConvertActions, 0, sizeof(ConvertActions));
411 memset(CondCodeActions, 0, sizeof(CondCodeActions));
413 // Set default actions for various operations.
414 for (unsigned VT = 0; VT != (unsigned)MVT::LAST_VALUETYPE; ++VT) {
415 // Default all indexed load / store to expand.
416 for (unsigned IM = (unsigned)ISD::PRE_INC;
417 IM != (unsigned)ISD::LAST_INDEXED_MODE; ++IM) {
418 setIndexedLoadAction(IM, (MVT::SimpleValueType)VT, Expand);
419 setIndexedStoreAction(IM, (MVT::SimpleValueType)VT, Expand);
422 // These operations default to expand.
423 setOperationAction(ISD::FGETSIGN, (MVT::SimpleValueType)VT, Expand);
426 // Most targets ignore the @llvm.prefetch intrinsic.
427 setOperationAction(ISD::PREFETCH, MVT::Other, Expand);
429 // ConstantFP nodes default to expand. Targets can either change this to
430 // Legal, in which case all fp constants are legal, or use addLegalFPImmediate
431 // to optimize expansions for certain constants.
432 setOperationAction(ISD::ConstantFP, MVT::f32, Expand);
433 setOperationAction(ISD::ConstantFP, MVT::f64, Expand);
434 setOperationAction(ISD::ConstantFP, MVT::f80, Expand);
436 // These library functions default to expand.
437 setOperationAction(ISD::FLOG , MVT::f64, Expand);
438 setOperationAction(ISD::FLOG2, MVT::f64, Expand);
439 setOperationAction(ISD::FLOG10,MVT::f64, Expand);
440 setOperationAction(ISD::FEXP , MVT::f64, Expand);
441 setOperationAction(ISD::FEXP2, MVT::f64, Expand);
442 setOperationAction(ISD::FLOG , MVT::f32, Expand);
443 setOperationAction(ISD::FLOG2, MVT::f32, Expand);
444 setOperationAction(ISD::FLOG10,MVT::f32, Expand);
445 setOperationAction(ISD::FEXP , MVT::f32, Expand);
446 setOperationAction(ISD::FEXP2, MVT::f32, Expand);
448 // Default ISD::TRAP to expand (which turns it into abort).
449 setOperationAction(ISD::TRAP, MVT::Other, Expand);
451 IsLittleEndian = TD->isLittleEndian();
452 UsesGlobalOffsetTable = false;
453 ShiftAmountTy = PointerTy = getValueType(TD->getIntPtrType());
454 ShiftAmtHandling = Undefined;
455 memset(RegClassForVT, 0,MVT::LAST_VALUETYPE*sizeof(TargetRegisterClass*));
456 memset(TargetDAGCombineArray, 0, array_lengthof(TargetDAGCombineArray));
457 maxStoresPerMemset = maxStoresPerMemcpy = maxStoresPerMemmove = 8;
458 allowUnalignedMemoryAccesses = false;
459 UseUnderscoreSetJmp = false;
460 UseUnderscoreLongJmp = false;
461 SelectIsExpensive = false;
462 IntDivIsCheap = false;
463 Pow2DivIsCheap = false;
464 StackPointerRegisterToSaveRestore = 0;
465 ExceptionPointerRegister = 0;
466 ExceptionSelectorRegister = 0;
467 BooleanContents = UndefinedBooleanContent;
468 SchedPreferenceInfo = SchedulingForLatency;
470 JumpBufAlignment = 0;
471 IfCvtBlockSizeLimit = 2;
472 IfCvtDupBlockSizeLimit = 0;
473 PrefLoopAlignment = 0;
475 InitLibcallNames(LibcallRoutineNames);
476 InitCmpLibcallCCs(CmpLibcallCCs);
478 // Tell Legalize whether the assembler supports DEBUG_LOC.
479 const TargetAsmInfo *TASM = TM.getTargetAsmInfo();
480 if (!TASM || !TASM->hasDotLocAndDotFile())
481 setOperationAction(ISD::DEBUG_LOC, MVT::Other, Expand);
484 TargetLowering::~TargetLowering() {}
486 /// computeRegisterProperties - Once all of the register classes are added,
487 /// this allows us to compute derived properties we expose.
488 void TargetLowering::computeRegisterProperties() {
489 assert(MVT::LAST_VALUETYPE <= 32 &&
490 "Too many value types for ValueTypeActions to hold!");
492 // Everything defaults to needing one register.
493 for (unsigned i = 0; i != MVT::LAST_VALUETYPE; ++i) {
494 NumRegistersForVT[i] = 1;
495 RegisterTypeForVT[i] = TransformToType[i] = (MVT::SimpleValueType)i;
497 // ...except isVoid, which doesn't need any registers.
498 NumRegistersForVT[MVT::isVoid] = 0;
500 // Find the largest integer register class.
501 unsigned LargestIntReg = MVT::LAST_INTEGER_VALUETYPE;
502 for (; RegClassForVT[LargestIntReg] == 0; --LargestIntReg)
503 assert(LargestIntReg != MVT::i1 && "No integer registers defined!");
505 // Every integer value type larger than this largest register takes twice as
506 // many registers to represent as the previous ValueType.
507 for (unsigned ExpandedReg = LargestIntReg + 1; ; ++ExpandedReg) {
508 MVT EVT = (MVT::SimpleValueType)ExpandedReg;
509 if (!EVT.isInteger())
511 NumRegistersForVT[ExpandedReg] = 2*NumRegistersForVT[ExpandedReg-1];
512 RegisterTypeForVT[ExpandedReg] = (MVT::SimpleValueType)LargestIntReg;
513 TransformToType[ExpandedReg] = (MVT::SimpleValueType)(ExpandedReg - 1);
514 ValueTypeActions.setTypeAction(EVT, Expand);
517 // Inspect all of the ValueType's smaller than the largest integer
518 // register to see which ones need promotion.
519 unsigned LegalIntReg = LargestIntReg;
520 for (unsigned IntReg = LargestIntReg - 1;
521 IntReg >= (unsigned)MVT::i1; --IntReg) {
522 MVT IVT = (MVT::SimpleValueType)IntReg;
523 if (isTypeLegal(IVT)) {
524 LegalIntReg = IntReg;
526 RegisterTypeForVT[IntReg] = TransformToType[IntReg] =
527 (MVT::SimpleValueType)LegalIntReg;
528 ValueTypeActions.setTypeAction(IVT, Promote);
532 // ppcf128 type is really two f64's.
533 if (!isTypeLegal(MVT::ppcf128)) {
534 NumRegistersForVT[MVT::ppcf128] = 2*NumRegistersForVT[MVT::f64];
535 RegisterTypeForVT[MVT::ppcf128] = MVT::f64;
536 TransformToType[MVT::ppcf128] = MVT::f64;
537 ValueTypeActions.setTypeAction(MVT::ppcf128, Expand);
540 // Decide how to handle f64. If the target does not have native f64 support,
541 // expand it to i64 and we will be generating soft float library calls.
542 if (!isTypeLegal(MVT::f64)) {
543 NumRegistersForVT[MVT::f64] = NumRegistersForVT[MVT::i64];
544 RegisterTypeForVT[MVT::f64] = RegisterTypeForVT[MVT::i64];
545 TransformToType[MVT::f64] = MVT::i64;
546 ValueTypeActions.setTypeAction(MVT::f64, Expand);
549 // Decide how to handle f32. If the target does not have native support for
550 // f32, promote it to f64 if it is legal. Otherwise, expand it to i32.
551 if (!isTypeLegal(MVT::f32)) {
552 if (isTypeLegal(MVT::f64)) {
553 NumRegistersForVT[MVT::f32] = NumRegistersForVT[MVT::f64];
554 RegisterTypeForVT[MVT::f32] = RegisterTypeForVT[MVT::f64];
555 TransformToType[MVT::f32] = MVT::f64;
556 ValueTypeActions.setTypeAction(MVT::f32, Promote);
558 NumRegistersForVT[MVT::f32] = NumRegistersForVT[MVT::i32];
559 RegisterTypeForVT[MVT::f32] = RegisterTypeForVT[MVT::i32];
560 TransformToType[MVT::f32] = MVT::i32;
561 ValueTypeActions.setTypeAction(MVT::f32, Expand);
565 // Loop over all of the vector value types to see which need transformations.
566 for (unsigned i = MVT::FIRST_VECTOR_VALUETYPE;
567 i <= (unsigned)MVT::LAST_VECTOR_VALUETYPE; ++i) {
568 MVT VT = (MVT::SimpleValueType)i;
569 if (!isTypeLegal(VT)) {
570 MVT IntermediateVT, RegisterVT;
571 unsigned NumIntermediates;
572 NumRegistersForVT[i] =
573 getVectorTypeBreakdown(VT,
574 IntermediateVT, NumIntermediates,
576 RegisterTypeForVT[i] = RegisterVT;
578 // Determine if there is a legal wider type.
579 bool IsLegalWiderType = false;
580 MVT EltVT = VT.getVectorElementType();
581 unsigned NElts = VT.getVectorNumElements();
582 for (unsigned nVT = i+1; nVT <= MVT::LAST_VECTOR_VALUETYPE; ++nVT) {
583 MVT SVT = (MVT::SimpleValueType)nVT;
584 if (isTypeLegal(SVT) && SVT.getVectorElementType() == EltVT &&
585 SVT.getVectorNumElements() > NElts) {
586 TransformToType[i] = SVT;
587 ValueTypeActions.setTypeAction(VT, Promote);
588 IsLegalWiderType = true;
592 if (!IsLegalWiderType) {
593 MVT NVT = VT.getPow2VectorType();
595 // Type is already a power of 2. The default action is to split.
596 TransformToType[i] = MVT::Other;
597 ValueTypeActions.setTypeAction(VT, Expand);
599 TransformToType[i] = NVT;
600 ValueTypeActions.setTypeAction(VT, Promote);
607 const char *TargetLowering::getTargetNodeName(unsigned Opcode) const {
612 MVT TargetLowering::getSetCCResultType(MVT VT) const {
613 return getValueType(TD->getIntPtrType());
617 /// getVectorTypeBreakdown - Vector types are broken down into some number of
618 /// legal first class types. For example, MVT::v8f32 maps to 2 MVT::v4f32
619 /// with Altivec or SSE1, or 8 promoted MVT::f64 values with the X86 FP stack.
620 /// Similarly, MVT::v2i64 turns into 4 MVT::i32 values with both PPC and X86.
622 /// This method returns the number of registers needed, and the VT for each
623 /// register. It also returns the VT and quantity of the intermediate values
624 /// before they are promoted/expanded.
626 unsigned TargetLowering::getVectorTypeBreakdown(MVT VT,
628 unsigned &NumIntermediates,
629 MVT &RegisterVT) const {
630 // Figure out the right, legal destination reg to copy into.
631 unsigned NumElts = VT.getVectorNumElements();
632 MVT EltTy = VT.getVectorElementType();
634 unsigned NumVectorRegs = 1;
636 // FIXME: We don't support non-power-of-2-sized vectors for now. Ideally we
637 // could break down into LHS/RHS like LegalizeDAG does.
638 if (!isPowerOf2_32(NumElts)) {
639 NumVectorRegs = NumElts;
643 // Divide the input until we get to a supported size. This will always
644 // end with a scalar if the target doesn't support vectors.
645 while (NumElts > 1 && !isTypeLegal(MVT::getVectorVT(EltTy, NumElts))) {
650 NumIntermediates = NumVectorRegs;
652 MVT NewVT = MVT::getVectorVT(EltTy, NumElts);
653 if (!isTypeLegal(NewVT))
655 IntermediateVT = NewVT;
657 MVT DestVT = getTypeToTransformTo(NewVT);
659 if (DestVT.bitsLT(NewVT)) {
660 // Value is expanded, e.g. i64 -> i16.
661 return NumVectorRegs*(NewVT.getSizeInBits()/DestVT.getSizeInBits());
663 // Otherwise, promotion or legal types use the same number of registers as
664 // the vector decimated to the appropriate level.
665 return NumVectorRegs;
671 /// getWidenVectorType: given a vector type, returns the type to widen to
672 /// (e.g., v7i8 to v8i8). If the vector type is legal, it returns itself.
673 /// If there is no vector type that we want to widen to, returns MVT::Other
674 /// When and where to widen is target dependent based on the cost of
675 /// scalarizing vs using the wider vector type.
676 MVT TargetLowering::getWidenVectorType(MVT VT) const {
677 assert(VT.isVector());
681 // Default is not to widen until moved to LegalizeTypes
685 /// getByValTypeAlignment - Return the desired alignment for ByVal aggregate
686 /// function arguments in the caller parameter area. This is the actual
687 /// alignment, not its logarithm.
688 unsigned TargetLowering::getByValTypeAlignment(const Type *Ty) const {
689 return TD->getCallFrameTypeAlignment(Ty);
692 SDValue TargetLowering::getPICJumpTableRelocBase(SDValue Table,
693 SelectionDAG &DAG) const {
694 if (usesGlobalOffsetTable())
695 return DAG.getNode(ISD::GLOBAL_OFFSET_TABLE, getPointerTy());
700 TargetLowering::isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const {
701 // Assume that everything is safe in static mode.
702 if (getTargetMachine().getRelocationModel() == Reloc::Static)
705 // In dynamic-no-pic mode, assume that known defined values are safe.
706 if (getTargetMachine().getRelocationModel() == Reloc::DynamicNoPIC &&
708 !GA->getGlobal()->isDeclaration() &&
709 !GA->getGlobal()->mayBeOverridden())
712 // Otherwise assume nothing is safe.
716 //===----------------------------------------------------------------------===//
717 // Optimization Methods
718 //===----------------------------------------------------------------------===//
720 /// ShrinkDemandedConstant - Check to see if the specified operand of the
721 /// specified instruction is a constant integer. If so, check to see if there
722 /// are any bits set in the constant that are not demanded. If so, shrink the
723 /// constant and return true.
724 bool TargetLowering::TargetLoweringOpt::ShrinkDemandedConstant(SDValue Op,
725 const APInt &Demanded) {
726 // FIXME: ISD::SELECT, ISD::SELECT_CC
727 switch(Op.getOpcode()) {
732 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1)))
733 if (C->getAPIntValue().intersects(~Demanded)) {
734 MVT VT = Op.getValueType();
735 SDValue New = DAG.getNode(Op.getOpcode(), VT, Op.getOperand(0),
736 DAG.getConstant(Demanded &
739 return CombineTo(Op, New);
746 /// SimplifyDemandedBits - Look at Op. At this point, we know that only the
747 /// DemandedMask bits of the result of Op are ever used downstream. If we can
748 /// use this information to simplify Op, create a new simplified DAG node and
749 /// return true, returning the original and new nodes in Old and New. Otherwise,
750 /// analyze the expression and return a mask of KnownOne and KnownZero bits for
751 /// the expression (used to simplify the caller). The KnownZero/One bits may
752 /// only be accurate for those bits in the DemandedMask.
753 bool TargetLowering::SimplifyDemandedBits(SDValue Op,
754 const APInt &DemandedMask,
757 TargetLoweringOpt &TLO,
758 unsigned Depth) const {
759 unsigned BitWidth = DemandedMask.getBitWidth();
760 assert(Op.getValueSizeInBits() == BitWidth &&
761 "Mask size mismatches value type size!");
762 APInt NewMask = DemandedMask;
764 // Don't know anything.
765 KnownZero = KnownOne = APInt(BitWidth, 0);
767 // Other users may use these bits.
768 if (!Op.getNode()->hasOneUse()) {
770 // If not at the root, Just compute the KnownZero/KnownOne bits to
771 // simplify things downstream.
772 TLO.DAG.ComputeMaskedBits(Op, DemandedMask, KnownZero, KnownOne, Depth);
775 // If this is the root being simplified, allow it to have multiple uses,
776 // just set the NewMask to all bits.
777 NewMask = APInt::getAllOnesValue(BitWidth);
778 } else if (DemandedMask == 0) {
779 // Not demanding any bits from Op.
780 if (Op.getOpcode() != ISD::UNDEF)
781 return TLO.CombineTo(Op, TLO.DAG.getNode(ISD::UNDEF, Op.getValueType()));
783 } else if (Depth == 6) { // Limit search depth.
787 APInt KnownZero2, KnownOne2, KnownZeroOut, KnownOneOut;
788 switch (Op.getOpcode()) {
790 // We know all of the bits for a constant!
791 KnownOne = cast<ConstantSDNode>(Op)->getAPIntValue() & NewMask;
792 KnownZero = ~KnownOne & NewMask;
793 return false; // Don't fall through, will infinitely loop.
795 // If the RHS is a constant, check to see if the LHS would be zero without
796 // using the bits from the RHS. Below, we use knowledge about the RHS to
797 // simplify the LHS, here we're using information from the LHS to simplify
799 if (ConstantSDNode *RHSC = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
800 APInt LHSZero, LHSOne;
801 TLO.DAG.ComputeMaskedBits(Op.getOperand(0), NewMask,
802 LHSZero, LHSOne, Depth+1);
803 // If the LHS already has zeros where RHSC does, this and is dead.
804 if ((LHSZero & NewMask) == (~RHSC->getAPIntValue() & NewMask))
805 return TLO.CombineTo(Op, Op.getOperand(0));
806 // If any of the set bits in the RHS are known zero on the LHS, shrink
808 if (TLO.ShrinkDemandedConstant(Op, ~LHSZero & NewMask))
812 if (SimplifyDemandedBits(Op.getOperand(1), NewMask, KnownZero,
813 KnownOne, TLO, Depth+1))
815 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
816 if (SimplifyDemandedBits(Op.getOperand(0), ~KnownZero & NewMask,
817 KnownZero2, KnownOne2, TLO, Depth+1))
819 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
821 // If all of the demanded bits are known one on one side, return the other.
822 // These bits cannot contribute to the result of the 'and'.
823 if ((NewMask & ~KnownZero2 & KnownOne) == (~KnownZero2 & NewMask))
824 return TLO.CombineTo(Op, Op.getOperand(0));
825 if ((NewMask & ~KnownZero & KnownOne2) == (~KnownZero & NewMask))
826 return TLO.CombineTo(Op, Op.getOperand(1));
827 // If all of the demanded bits in the inputs are known zeros, return zero.
828 if ((NewMask & (KnownZero|KnownZero2)) == NewMask)
829 return TLO.CombineTo(Op, TLO.DAG.getConstant(0, Op.getValueType()));
830 // If the RHS is a constant, see if we can simplify it.
831 if (TLO.ShrinkDemandedConstant(Op, ~KnownZero2 & NewMask))
834 // Output known-1 bits are only known if set in both the LHS & RHS.
835 KnownOne &= KnownOne2;
836 // Output known-0 are known to be clear if zero in either the LHS | RHS.
837 KnownZero |= KnownZero2;
840 if (SimplifyDemandedBits(Op.getOperand(1), NewMask, KnownZero,
841 KnownOne, TLO, Depth+1))
843 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
844 if (SimplifyDemandedBits(Op.getOperand(0), ~KnownOne & NewMask,
845 KnownZero2, KnownOne2, TLO, Depth+1))
847 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
849 // If all of the demanded bits are known zero on one side, return the other.
850 // These bits cannot contribute to the result of the 'or'.
851 if ((NewMask & ~KnownOne2 & KnownZero) == (~KnownOne2 & NewMask))
852 return TLO.CombineTo(Op, Op.getOperand(0));
853 if ((NewMask & ~KnownOne & KnownZero2) == (~KnownOne & NewMask))
854 return TLO.CombineTo(Op, Op.getOperand(1));
855 // If all of the potentially set bits on one side are known to be set on
856 // the other side, just use the 'other' side.
857 if ((NewMask & ~KnownZero & KnownOne2) == (~KnownZero & NewMask))
858 return TLO.CombineTo(Op, Op.getOperand(0));
859 if ((NewMask & ~KnownZero2 & KnownOne) == (~KnownZero2 & NewMask))
860 return TLO.CombineTo(Op, Op.getOperand(1));
861 // If the RHS is a constant, see if we can simplify it.
862 if (TLO.ShrinkDemandedConstant(Op, NewMask))
865 // Output known-0 bits are only known if clear in both the LHS & RHS.
866 KnownZero &= KnownZero2;
867 // Output known-1 are known to be set if set in either the LHS | RHS.
868 KnownOne |= KnownOne2;
871 if (SimplifyDemandedBits(Op.getOperand(1), NewMask, KnownZero,
872 KnownOne, TLO, Depth+1))
874 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
875 if (SimplifyDemandedBits(Op.getOperand(0), NewMask, KnownZero2,
876 KnownOne2, TLO, Depth+1))
878 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
880 // If all of the demanded bits are known zero on one side, return the other.
881 // These bits cannot contribute to the result of the 'xor'.
882 if ((KnownZero & NewMask) == NewMask)
883 return TLO.CombineTo(Op, Op.getOperand(0));
884 if ((KnownZero2 & NewMask) == NewMask)
885 return TLO.CombineTo(Op, Op.getOperand(1));
887 // If all of the unknown bits are known to be zero on one side or the other
888 // (but not both) turn this into an *inclusive* or.
889 // e.g. (A & C1)^(B & C2) -> (A & C1)|(B & C2) iff C1&C2 == 0
890 if ((NewMask & ~KnownZero & ~KnownZero2) == 0)
891 return TLO.CombineTo(Op, TLO.DAG.getNode(ISD::OR, Op.getValueType(),
895 // Output known-0 bits are known if clear or set in both the LHS & RHS.
896 KnownZeroOut = (KnownZero & KnownZero2) | (KnownOne & KnownOne2);
897 // Output known-1 are known to be set if set in only one of the LHS, RHS.
898 KnownOneOut = (KnownZero & KnownOne2) | (KnownOne & KnownZero2);
900 // If all of the demanded bits on one side are known, and all of the set
901 // bits on that side are also known to be set on the other side, turn this
902 // into an AND, as we know the bits will be cleared.
903 // e.g. (X | C1) ^ C2 --> (X | C1) & ~C2 iff (C1&C2) == C2
904 if ((NewMask & (KnownZero|KnownOne)) == NewMask) { // all known
905 if ((KnownOne & KnownOne2) == KnownOne) {
906 MVT VT = Op.getValueType();
907 SDValue ANDC = TLO.DAG.getConstant(~KnownOne & NewMask, VT);
908 return TLO.CombineTo(Op, TLO.DAG.getNode(ISD::AND, VT, Op.getOperand(0),
913 // If the RHS is a constant, see if we can simplify it.
914 // for XOR, we prefer to force bits to 1 if they will make a -1.
915 // if we can't force bits, try to shrink constant
916 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
917 APInt Expanded = C->getAPIntValue() | (~NewMask);
918 // if we can expand it to have all bits set, do it
919 if (Expanded.isAllOnesValue()) {
920 if (Expanded != C->getAPIntValue()) {
921 MVT VT = Op.getValueType();
922 SDValue New = TLO.DAG.getNode(Op.getOpcode(), VT, Op.getOperand(0),
923 TLO.DAG.getConstant(Expanded, VT));
924 return TLO.CombineTo(Op, New);
926 // if it already has all the bits set, nothing to change
927 // but don't shrink either!
928 } else if (TLO.ShrinkDemandedConstant(Op, NewMask)) {
933 KnownZero = KnownZeroOut;
934 KnownOne = KnownOneOut;
937 if (SimplifyDemandedBits(Op.getOperand(2), NewMask, KnownZero,
938 KnownOne, TLO, Depth+1))
940 if (SimplifyDemandedBits(Op.getOperand(1), NewMask, KnownZero2,
941 KnownOne2, TLO, Depth+1))
943 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
944 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
946 // If the operands are constants, see if we can simplify them.
947 if (TLO.ShrinkDemandedConstant(Op, NewMask))
950 // Only known if known in both the LHS and RHS.
951 KnownOne &= KnownOne2;
952 KnownZero &= KnownZero2;
955 if (SimplifyDemandedBits(Op.getOperand(3), NewMask, KnownZero,
956 KnownOne, TLO, Depth+1))
958 if (SimplifyDemandedBits(Op.getOperand(2), NewMask, KnownZero2,
959 KnownOne2, TLO, Depth+1))
961 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
962 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
964 // If the operands are constants, see if we can simplify them.
965 if (TLO.ShrinkDemandedConstant(Op, NewMask))
968 // Only known if known in both the LHS and RHS.
969 KnownOne &= KnownOne2;
970 KnownZero &= KnownZero2;
973 if (ConstantSDNode *SA = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
974 unsigned ShAmt = SA->getZExtValue();
975 SDValue InOp = Op.getOperand(0);
977 // If the shift count is an invalid immediate, don't do anything.
978 if (ShAmt >= BitWidth)
981 // If this is ((X >>u C1) << ShAmt), see if we can simplify this into a
982 // single shift. We can do this if the bottom bits (which are shifted
983 // out) are never demanded.
984 if (InOp.getOpcode() == ISD::SRL &&
985 isa<ConstantSDNode>(InOp.getOperand(1))) {
986 if (ShAmt && (NewMask & APInt::getLowBitsSet(BitWidth, ShAmt)) == 0) {
987 unsigned C1= cast<ConstantSDNode>(InOp.getOperand(1))->getZExtValue();
988 unsigned Opc = ISD::SHL;
996 TLO.DAG.getConstant(Diff, Op.getOperand(1).getValueType());
997 MVT VT = Op.getValueType();
998 return TLO.CombineTo(Op, TLO.DAG.getNode(Opc, VT,
999 InOp.getOperand(0), NewSA));
1003 if (SimplifyDemandedBits(Op.getOperand(0), NewMask.lshr(ShAmt),
1004 KnownZero, KnownOne, TLO, Depth+1))
1006 KnownZero <<= SA->getZExtValue();
1007 KnownOne <<= SA->getZExtValue();
1008 // low bits known zero.
1009 KnownZero |= APInt::getLowBitsSet(BitWidth, SA->getZExtValue());
1013 if (ConstantSDNode *SA = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
1014 MVT VT = Op.getValueType();
1015 unsigned ShAmt = SA->getZExtValue();
1016 unsigned VTSize = VT.getSizeInBits();
1017 SDValue InOp = Op.getOperand(0);
1019 // If the shift count is an invalid immediate, don't do anything.
1020 if (ShAmt >= BitWidth)
1023 // If this is ((X << C1) >>u ShAmt), see if we can simplify this into a
1024 // single shift. We can do this if the top bits (which are shifted out)
1025 // are never demanded.
1026 if (InOp.getOpcode() == ISD::SHL &&
1027 isa<ConstantSDNode>(InOp.getOperand(1))) {
1028 if (ShAmt && (NewMask & APInt::getHighBitsSet(VTSize, ShAmt)) == 0) {
1029 unsigned C1= cast<ConstantSDNode>(InOp.getOperand(1))->getZExtValue();
1030 unsigned Opc = ISD::SRL;
1031 int Diff = ShAmt-C1;
1038 TLO.DAG.getConstant(Diff, Op.getOperand(1).getValueType());
1039 return TLO.CombineTo(Op, TLO.DAG.getNode(Opc, VT,
1040 InOp.getOperand(0), NewSA));
1044 // Compute the new bits that are at the top now.
1045 if (SimplifyDemandedBits(InOp, (NewMask << ShAmt),
1046 KnownZero, KnownOne, TLO, Depth+1))
1048 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1049 KnownZero = KnownZero.lshr(ShAmt);
1050 KnownOne = KnownOne.lshr(ShAmt);
1052 APInt HighBits = APInt::getHighBitsSet(BitWidth, ShAmt);
1053 KnownZero |= HighBits; // High bits known zero.
1057 if (ConstantSDNode *SA = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
1058 MVT VT = Op.getValueType();
1059 unsigned ShAmt = SA->getZExtValue();
1061 // If the shift count is an invalid immediate, don't do anything.
1062 if (ShAmt >= BitWidth)
1065 APInt InDemandedMask = (NewMask << ShAmt);
1067 // If any of the demanded bits are produced by the sign extension, we also
1068 // demand the input sign bit.
1069 APInt HighBits = APInt::getHighBitsSet(BitWidth, ShAmt);
1070 if (HighBits.intersects(NewMask))
1071 InDemandedMask |= APInt::getSignBit(VT.getSizeInBits());
1073 if (SimplifyDemandedBits(Op.getOperand(0), InDemandedMask,
1074 KnownZero, KnownOne, TLO, Depth+1))
1076 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1077 KnownZero = KnownZero.lshr(ShAmt);
1078 KnownOne = KnownOne.lshr(ShAmt);
1080 // Handle the sign bit, adjusted to where it is now in the mask.
1081 APInt SignBit = APInt::getSignBit(BitWidth).lshr(ShAmt);
1083 // If the input sign bit is known to be zero, or if none of the top bits
1084 // are demanded, turn this into an unsigned shift right.
1085 if (KnownZero.intersects(SignBit) || (HighBits & ~NewMask) == HighBits) {
1086 return TLO.CombineTo(Op, TLO.DAG.getNode(ISD::SRL, VT, Op.getOperand(0),
1088 } else if (KnownOne.intersects(SignBit)) { // New bits are known one.
1089 KnownOne |= HighBits;
1093 case ISD::SIGN_EXTEND_INREG: {
1094 MVT EVT = cast<VTSDNode>(Op.getOperand(1))->getVT();
1096 // Sign extension. Compute the demanded bits in the result that are not
1097 // present in the input.
1098 APInt NewBits = APInt::getHighBitsSet(BitWidth,
1099 BitWidth - EVT.getSizeInBits()) &
1102 // If none of the extended bits are demanded, eliminate the sextinreg.
1104 return TLO.CombineTo(Op, Op.getOperand(0));
1106 APInt InSignBit = APInt::getSignBit(EVT.getSizeInBits());
1107 InSignBit.zext(BitWidth);
1108 APInt InputDemandedBits = APInt::getLowBitsSet(BitWidth,
1109 EVT.getSizeInBits()) &
1112 // Since the sign extended bits are demanded, we know that the sign
1114 InputDemandedBits |= InSignBit;
1116 if (SimplifyDemandedBits(Op.getOperand(0), InputDemandedBits,
1117 KnownZero, KnownOne, TLO, Depth+1))
1119 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1121 // If the sign bit of the input is known set or clear, then we know the
1122 // top bits of the result.
1124 // If the input sign bit is known zero, convert this into a zero extension.
1125 if (KnownZero.intersects(InSignBit))
1126 return TLO.CombineTo(Op,
1127 TLO.DAG.getZeroExtendInReg(Op.getOperand(0), EVT));
1129 if (KnownOne.intersects(InSignBit)) { // Input sign bit known set
1130 KnownOne |= NewBits;
1131 KnownZero &= ~NewBits;
1132 } else { // Input sign bit unknown
1133 KnownZero &= ~NewBits;
1134 KnownOne &= ~NewBits;
1138 case ISD::ZERO_EXTEND: {
1139 unsigned OperandBitWidth = Op.getOperand(0).getValueSizeInBits();
1140 APInt InMask = NewMask;
1141 InMask.trunc(OperandBitWidth);
1143 // If none of the top bits are demanded, convert this into an any_extend.
1145 APInt::getHighBitsSet(BitWidth, BitWidth - OperandBitWidth) & NewMask;
1146 if (!NewBits.intersects(NewMask))
1147 return TLO.CombineTo(Op, TLO.DAG.getNode(ISD::ANY_EXTEND,
1151 if (SimplifyDemandedBits(Op.getOperand(0), InMask,
1152 KnownZero, KnownOne, TLO, Depth+1))
1154 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1155 KnownZero.zext(BitWidth);
1156 KnownOne.zext(BitWidth);
1157 KnownZero |= NewBits;
1160 case ISD::SIGN_EXTEND: {
1161 MVT InVT = Op.getOperand(0).getValueType();
1162 unsigned InBits = InVT.getSizeInBits();
1163 APInt InMask = APInt::getLowBitsSet(BitWidth, InBits);
1164 APInt InSignBit = APInt::getBitsSet(BitWidth, InBits - 1, InBits);
1165 APInt NewBits = ~InMask & NewMask;
1167 // If none of the top bits are demanded, convert this into an any_extend.
1169 return TLO.CombineTo(Op,TLO.DAG.getNode(ISD::ANY_EXTEND,Op.getValueType(),
1172 // Since some of the sign extended bits are demanded, we know that the sign
1174 APInt InDemandedBits = InMask & NewMask;
1175 InDemandedBits |= InSignBit;
1176 InDemandedBits.trunc(InBits);
1178 if (SimplifyDemandedBits(Op.getOperand(0), InDemandedBits, KnownZero,
1179 KnownOne, TLO, Depth+1))
1181 KnownZero.zext(BitWidth);
1182 KnownOne.zext(BitWidth);
1184 // If the sign bit is known zero, convert this to a zero extend.
1185 if (KnownZero.intersects(InSignBit))
1186 return TLO.CombineTo(Op, TLO.DAG.getNode(ISD::ZERO_EXTEND,
1190 // If the sign bit is known one, the top bits match.
1191 if (KnownOne.intersects(InSignBit)) {
1192 KnownOne |= NewBits;
1193 KnownZero &= ~NewBits;
1194 } else { // Otherwise, top bits aren't known.
1195 KnownOne &= ~NewBits;
1196 KnownZero &= ~NewBits;
1200 case ISD::ANY_EXTEND: {
1201 unsigned OperandBitWidth = Op.getOperand(0).getValueSizeInBits();
1202 APInt InMask = NewMask;
1203 InMask.trunc(OperandBitWidth);
1204 if (SimplifyDemandedBits(Op.getOperand(0), InMask,
1205 KnownZero, KnownOne, TLO, Depth+1))
1207 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1208 KnownZero.zext(BitWidth);
1209 KnownOne.zext(BitWidth);
1212 case ISD::TRUNCATE: {
1213 // Simplify the input, using demanded bit information, and compute the known
1214 // zero/one bits live out.
1215 APInt TruncMask = NewMask;
1216 TruncMask.zext(Op.getOperand(0).getValueSizeInBits());
1217 if (SimplifyDemandedBits(Op.getOperand(0), TruncMask,
1218 KnownZero, KnownOne, TLO, Depth+1))
1220 KnownZero.trunc(BitWidth);
1221 KnownOne.trunc(BitWidth);
1223 // If the input is only used by this truncate, see if we can shrink it based
1224 // on the known demanded bits.
1225 if (Op.getOperand(0).getNode()->hasOneUse()) {
1226 SDValue In = Op.getOperand(0);
1227 unsigned InBitWidth = In.getValueSizeInBits();
1228 switch (In.getOpcode()) {
1231 // Shrink SRL by a constant if none of the high bits shifted in are
1233 if (ConstantSDNode *ShAmt = dyn_cast<ConstantSDNode>(In.getOperand(1))){
1234 APInt HighBits = APInt::getHighBitsSet(InBitWidth,
1235 InBitWidth - BitWidth);
1236 HighBits = HighBits.lshr(ShAmt->getZExtValue());
1237 HighBits.trunc(BitWidth);
1239 if (ShAmt->getZExtValue() < BitWidth && !(HighBits & NewMask)) {
1240 // None of the shifted in bits are needed. Add a truncate of the
1241 // shift input, then shift it.
1242 SDValue NewTrunc = TLO.DAG.getNode(ISD::TRUNCATE,
1245 return TLO.CombineTo(Op, TLO.DAG.getNode(ISD::SRL,Op.getValueType(),
1246 NewTrunc, In.getOperand(1)));
1253 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1256 case ISD::AssertZext: {
1257 MVT VT = cast<VTSDNode>(Op.getOperand(1))->getVT();
1258 APInt InMask = APInt::getLowBitsSet(BitWidth,
1259 VT.getSizeInBits());
1260 if (SimplifyDemandedBits(Op.getOperand(0), InMask & NewMask,
1261 KnownZero, KnownOne, TLO, Depth+1))
1263 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1264 KnownZero |= ~InMask & NewMask;
1267 case ISD::BIT_CONVERT:
1269 // If this is an FP->Int bitcast and if the sign bit is the only thing that
1270 // is demanded, turn this into a FGETSIGN.
1271 if (NewMask == MVT::getIntegerVTSignBit(Op.getValueType()) &&
1272 MVT::isFloatingPoint(Op.getOperand(0).getValueType()) &&
1273 !MVT::isVector(Op.getOperand(0).getValueType())) {
1274 // Only do this xform if FGETSIGN is valid or if before legalize.
1275 if (!TLO.AfterLegalize ||
1276 isOperationLegal(ISD::FGETSIGN, Op.getValueType())) {
1277 // Make a FGETSIGN + SHL to move the sign bit into the appropriate
1278 // place. We expect the SHL to be eliminated by other optimizations.
1279 SDValue Sign = TLO.DAG.getNode(ISD::FGETSIGN, Op.getValueType(),
1281 unsigned ShVal = Op.getValueType().getSizeInBits()-1;
1282 SDValue ShAmt = TLO.DAG.getConstant(ShVal, getShiftAmountTy());
1283 return TLO.CombineTo(Op, TLO.DAG.getNode(ISD::SHL, Op.getValueType(),
1290 // Just use ComputeMaskedBits to compute output bits.
1291 TLO.DAG.ComputeMaskedBits(Op, NewMask, KnownZero, KnownOne, Depth);
1295 // If we know the value of all of the demanded bits, return this as a
1297 if ((NewMask & (KnownZero|KnownOne)) == NewMask)
1298 return TLO.CombineTo(Op, TLO.DAG.getConstant(KnownOne, Op.getValueType()));
1303 /// computeMaskedBitsForTargetNode - Determine which of the bits specified
1304 /// in Mask are known to be either zero or one and return them in the
1305 /// KnownZero/KnownOne bitsets.
1306 void TargetLowering::computeMaskedBitsForTargetNode(const SDValue Op,
1310 const SelectionDAG &DAG,
1311 unsigned Depth) const {
1312 assert((Op.getOpcode() >= ISD::BUILTIN_OP_END ||
1313 Op.getOpcode() == ISD::INTRINSIC_WO_CHAIN ||
1314 Op.getOpcode() == ISD::INTRINSIC_W_CHAIN ||
1315 Op.getOpcode() == ISD::INTRINSIC_VOID) &&
1316 "Should use MaskedValueIsZero if you don't know whether Op"
1317 " is a target node!");
1318 KnownZero = KnownOne = APInt(Mask.getBitWidth(), 0);
1321 /// ComputeNumSignBitsForTargetNode - This method can be implemented by
1322 /// targets that want to expose additional information about sign bits to the
1324 unsigned TargetLowering::ComputeNumSignBitsForTargetNode(SDValue Op,
1325 unsigned Depth) const {
1326 assert((Op.getOpcode() >= ISD::BUILTIN_OP_END ||
1327 Op.getOpcode() == ISD::INTRINSIC_WO_CHAIN ||
1328 Op.getOpcode() == ISD::INTRINSIC_W_CHAIN ||
1329 Op.getOpcode() == ISD::INTRINSIC_VOID) &&
1330 "Should use ComputeNumSignBits if you don't know whether Op"
1331 " is a target node!");
1336 /// SimplifySetCC - Try to simplify a setcc built with the specified operands
1337 /// and cc. If it is unable to simplify it, return a null SDValue.
1339 TargetLowering::SimplifySetCC(MVT VT, SDValue N0, SDValue N1,
1340 ISD::CondCode Cond, bool foldBooleans,
1341 DAGCombinerInfo &DCI) const {
1342 SelectionDAG &DAG = DCI.DAG;
1344 // These setcc operations always fold.
1348 case ISD::SETFALSE2: return DAG.getConstant(0, VT);
1350 case ISD::SETTRUE2: return DAG.getConstant(1, VT);
1353 if (ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.getNode())) {
1354 const APInt &C1 = N1C->getAPIntValue();
1355 if (isa<ConstantSDNode>(N0.getNode())) {
1356 return DAG.FoldSetCC(VT, N0, N1, Cond);
1358 // If the LHS is '(srl (ctlz x), 5)', the RHS is 0/1, and this is an
1359 // equality comparison, then we're just comparing whether X itself is
1361 if (N0.getOpcode() == ISD::SRL && (C1 == 0 || C1 == 1) &&
1362 N0.getOperand(0).getOpcode() == ISD::CTLZ &&
1363 N0.getOperand(1).getOpcode() == ISD::Constant) {
1364 unsigned ShAmt = cast<ConstantSDNode>(N0.getOperand(1))->getZExtValue();
1365 if ((Cond == ISD::SETEQ || Cond == ISD::SETNE) &&
1366 ShAmt == Log2_32(N0.getValueType().getSizeInBits())) {
1367 if ((C1 == 0) == (Cond == ISD::SETEQ)) {
1368 // (srl (ctlz x), 5) == 0 -> X != 0
1369 // (srl (ctlz x), 5) != 1 -> X != 0
1372 // (srl (ctlz x), 5) != 0 -> X == 0
1373 // (srl (ctlz x), 5) == 1 -> X == 0
1376 SDValue Zero = DAG.getConstant(0, N0.getValueType());
1377 return DAG.getSetCC(VT, N0.getOperand(0).getOperand(0),
1382 // If the LHS is '(and load, const)', the RHS is 0,
1383 // the test is for equality or unsigned, and all 1 bits of the const are
1384 // in the same partial word, see if we can shorten the load.
1385 if (DCI.isBeforeLegalize() &&
1386 N0.getOpcode() == ISD::AND && C1 == 0 &&
1387 isa<LoadSDNode>(N0.getOperand(0)) &&
1388 N0.getOperand(0).getNode()->hasOneUse() &&
1389 isa<ConstantSDNode>(N0.getOperand(1))) {
1390 LoadSDNode *Lod = cast<LoadSDNode>(N0.getOperand(0));
1391 uint64_t Mask = cast<ConstantSDNode>(N0.getOperand(1))->getZExtValue();
1392 uint64_t bestMask = 0;
1393 unsigned bestWidth = 0, bestOffset = 0;
1394 if (!Lod->isVolatile() && Lod->isUnindexed()) {
1395 unsigned origWidth = N0.getValueType().getSizeInBits();
1396 // We can narrow (e.g.) 16-bit extending loads on 32-bit target to
1397 // 8 bits, but have to be careful...
1398 if (Lod->getExtensionType() != ISD::NON_EXTLOAD)
1399 origWidth = Lod->getMemoryVT().getSizeInBits();
1400 for (unsigned width = origWidth / 2; width>=8; width /= 2) {
1401 uint64_t newMask = (1ULL << width) - 1;
1402 for (unsigned offset=0; offset<origWidth/width; offset++) {
1403 if ((newMask & Mask)==Mask) {
1404 if (!TD->isLittleEndian())
1405 bestOffset = (origWidth/width - offset - 1) * (width/8);
1407 bestOffset = (uint64_t)offset * (width/8);
1408 bestMask = Mask >> (offset * (width/8) * 8);
1412 newMask = newMask << width;
1417 MVT newVT = MVT::getIntegerVT(bestWidth);
1418 if (newVT.isRound()) {
1419 MVT PtrType = Lod->getOperand(1).getValueType();
1420 SDValue Ptr = Lod->getBasePtr();
1421 if (bestOffset != 0)
1422 Ptr = DAG.getNode(ISD::ADD, PtrType, Lod->getBasePtr(),
1423 DAG.getConstant(bestOffset, PtrType));
1424 unsigned NewAlign = MinAlign(Lod->getAlignment(), bestOffset);
1425 SDValue NewLoad = DAG.getLoad(newVT, Lod->getChain(), Ptr,
1427 Lod->getSrcValueOffset() + bestOffset,
1429 return DAG.getSetCC(VT, DAG.getNode(ISD::AND, newVT, NewLoad,
1430 DAG.getConstant(bestMask, newVT)),
1431 DAG.getConstant(0LL, newVT), Cond);
1436 // If the LHS is a ZERO_EXTEND, perform the comparison on the input.
1437 if (N0.getOpcode() == ISD::ZERO_EXTEND) {
1438 unsigned InSize = N0.getOperand(0).getValueType().getSizeInBits();
1440 // If the comparison constant has bits in the upper part, the
1441 // zero-extended value could never match.
1442 if (C1.intersects(APInt::getHighBitsSet(C1.getBitWidth(),
1443 C1.getBitWidth() - InSize))) {
1447 case ISD::SETEQ: return DAG.getConstant(0, VT);
1450 case ISD::SETNE: return DAG.getConstant(1, VT);
1453 // True if the sign bit of C1 is set.
1454 return DAG.getConstant(C1.isNegative(), VT);
1457 // True if the sign bit of C1 isn't set.
1458 return DAG.getConstant(C1.isNonNegative(), VT);
1464 // Otherwise, we can perform the comparison with the low bits.
1472 return DAG.getSetCC(VT, N0.getOperand(0),
1473 DAG.getConstant(APInt(C1).trunc(InSize),
1474 N0.getOperand(0).getValueType()),
1477 break; // todo, be more careful with signed comparisons
1479 } else if (N0.getOpcode() == ISD::SIGN_EXTEND_INREG &&
1480 (Cond == ISD::SETEQ || Cond == ISD::SETNE)) {
1481 MVT ExtSrcTy = cast<VTSDNode>(N0.getOperand(1))->getVT();
1482 unsigned ExtSrcTyBits = ExtSrcTy.getSizeInBits();
1483 MVT ExtDstTy = N0.getValueType();
1484 unsigned ExtDstTyBits = ExtDstTy.getSizeInBits();
1486 // If the extended part has any inconsistent bits, it cannot ever
1487 // compare equal. In other words, they have to be all ones or all
1490 APInt::getHighBitsSet(ExtDstTyBits, ExtDstTyBits - ExtSrcTyBits);
1491 if ((C1 & ExtBits) != 0 && (C1 & ExtBits) != ExtBits)
1492 return DAG.getConstant(Cond == ISD::SETNE, VT);
1495 MVT Op0Ty = N0.getOperand(0).getValueType();
1496 if (Op0Ty == ExtSrcTy) {
1497 ZextOp = N0.getOperand(0);
1499 APInt Imm = APInt::getLowBitsSet(ExtDstTyBits, ExtSrcTyBits);
1500 ZextOp = DAG.getNode(ISD::AND, Op0Ty, N0.getOperand(0),
1501 DAG.getConstant(Imm, Op0Ty));
1503 if (!DCI.isCalledByLegalizer())
1504 DCI.AddToWorklist(ZextOp.getNode());
1505 // Otherwise, make this a use of a zext.
1506 return DAG.getSetCC(VT, ZextOp,
1507 DAG.getConstant(C1 & APInt::getLowBitsSet(
1512 } else if ((N1C->isNullValue() || N1C->getAPIntValue() == 1) &&
1513 (Cond == ISD::SETEQ || Cond == ISD::SETNE)) {
1515 // SETCC (SETCC), [0|1], [EQ|NE] -> SETCC
1516 if (N0.getOpcode() == ISD::SETCC) {
1517 bool TrueWhenTrue = (Cond == ISD::SETEQ) ^ (N1C->getZExtValue() != 1);
1521 // Invert the condition.
1522 ISD::CondCode CC = cast<CondCodeSDNode>(N0.getOperand(2))->get();
1523 CC = ISD::getSetCCInverse(CC,
1524 N0.getOperand(0).getValueType().isInteger());
1525 return DAG.getSetCC(VT, N0.getOperand(0), N0.getOperand(1), CC);
1528 if ((N0.getOpcode() == ISD::XOR ||
1529 (N0.getOpcode() == ISD::AND &&
1530 N0.getOperand(0).getOpcode() == ISD::XOR &&
1531 N0.getOperand(1) == N0.getOperand(0).getOperand(1))) &&
1532 isa<ConstantSDNode>(N0.getOperand(1)) &&
1533 cast<ConstantSDNode>(N0.getOperand(1))->getAPIntValue() == 1) {
1534 // If this is (X^1) == 0/1, swap the RHS and eliminate the xor. We
1535 // can only do this if the top bits are known zero.
1536 unsigned BitWidth = N0.getValueSizeInBits();
1537 if (DAG.MaskedValueIsZero(N0,
1538 APInt::getHighBitsSet(BitWidth,
1540 // Okay, get the un-inverted input value.
1542 if (N0.getOpcode() == ISD::XOR)
1543 Val = N0.getOperand(0);
1545 assert(N0.getOpcode() == ISD::AND &&
1546 N0.getOperand(0).getOpcode() == ISD::XOR);
1547 // ((X^1)&1)^1 -> X & 1
1548 Val = DAG.getNode(ISD::AND, N0.getValueType(),
1549 N0.getOperand(0).getOperand(0),
1552 return DAG.getSetCC(VT, Val, N1,
1553 Cond == ISD::SETEQ ? ISD::SETNE : ISD::SETEQ);
1558 APInt MinVal, MaxVal;
1559 unsigned OperandBitSize = N1C->getValueType(0).getSizeInBits();
1560 if (ISD::isSignedIntSetCC(Cond)) {
1561 MinVal = APInt::getSignedMinValue(OperandBitSize);
1562 MaxVal = APInt::getSignedMaxValue(OperandBitSize);
1564 MinVal = APInt::getMinValue(OperandBitSize);
1565 MaxVal = APInt::getMaxValue(OperandBitSize);
1568 // Canonicalize GE/LE comparisons to use GT/LT comparisons.
1569 if (Cond == ISD::SETGE || Cond == ISD::SETUGE) {
1570 if (C1 == MinVal) return DAG.getConstant(1, VT); // X >= MIN --> true
1571 // X >= C0 --> X > (C0-1)
1572 return DAG.getSetCC(VT, N0, DAG.getConstant(C1-1, N1.getValueType()),
1573 (Cond == ISD::SETGE) ? ISD::SETGT : ISD::SETUGT);
1576 if (Cond == ISD::SETLE || Cond == ISD::SETULE) {
1577 if (C1 == MaxVal) return DAG.getConstant(1, VT); // X <= MAX --> true
1578 // X <= C0 --> X < (C0+1)
1579 return DAG.getSetCC(VT, N0, DAG.getConstant(C1+1, N1.getValueType()),
1580 (Cond == ISD::SETLE) ? ISD::SETLT : ISD::SETULT);
1583 if ((Cond == ISD::SETLT || Cond == ISD::SETULT) && C1 == MinVal)
1584 return DAG.getConstant(0, VT); // X < MIN --> false
1585 if ((Cond == ISD::SETGE || Cond == ISD::SETUGE) && C1 == MinVal)
1586 return DAG.getConstant(1, VT); // X >= MIN --> true
1587 if ((Cond == ISD::SETGT || Cond == ISD::SETUGT) && C1 == MaxVal)
1588 return DAG.getConstant(0, VT); // X > MAX --> false
1589 if ((Cond == ISD::SETLE || Cond == ISD::SETULE) && C1 == MaxVal)
1590 return DAG.getConstant(1, VT); // X <= MAX --> true
1592 // Canonicalize setgt X, Min --> setne X, Min
1593 if ((Cond == ISD::SETGT || Cond == ISD::SETUGT) && C1 == MinVal)
1594 return DAG.getSetCC(VT, N0, N1, ISD::SETNE);
1595 // Canonicalize setlt X, Max --> setne X, Max
1596 if ((Cond == ISD::SETLT || Cond == ISD::SETULT) && C1 == MaxVal)
1597 return DAG.getSetCC(VT, N0, N1, ISD::SETNE);
1599 // If we have setult X, 1, turn it into seteq X, 0
1600 if ((Cond == ISD::SETLT || Cond == ISD::SETULT) && C1 == MinVal+1)
1601 return DAG.getSetCC(VT, N0, DAG.getConstant(MinVal, N0.getValueType()),
1603 // If we have setugt X, Max-1, turn it into seteq X, Max
1604 else if ((Cond == ISD::SETGT || Cond == ISD::SETUGT) && C1 == MaxVal-1)
1605 return DAG.getSetCC(VT, N0, DAG.getConstant(MaxVal, N0.getValueType()),
1608 // If we have "setcc X, C0", check to see if we can shrink the immediate
1611 // SETUGT X, SINTMAX -> SETLT X, 0
1612 if (Cond == ISD::SETUGT &&
1613 C1 == APInt::getSignedMaxValue(OperandBitSize))
1614 return DAG.getSetCC(VT, N0, DAG.getConstant(0, N1.getValueType()),
1617 // SETULT X, SINTMIN -> SETGT X, -1
1618 if (Cond == ISD::SETULT &&
1619 C1 == APInt::getSignedMinValue(OperandBitSize)) {
1620 SDValue ConstMinusOne =
1621 DAG.getConstant(APInt::getAllOnesValue(OperandBitSize),
1623 return DAG.getSetCC(VT, N0, ConstMinusOne, ISD::SETGT);
1626 // Fold bit comparisons when we can.
1627 if ((Cond == ISD::SETEQ || Cond == ISD::SETNE) &&
1628 VT == N0.getValueType() && N0.getOpcode() == ISD::AND)
1629 if (ConstantSDNode *AndRHS =
1630 dyn_cast<ConstantSDNode>(N0.getOperand(1))) {
1631 if (Cond == ISD::SETNE && C1 == 0) {// (X & 8) != 0 --> (X & 8) >> 3
1632 // Perform the xform if the AND RHS is a single bit.
1633 if (isPowerOf2_64(AndRHS->getZExtValue())) {
1634 return DAG.getNode(ISD::SRL, VT, N0,
1635 DAG.getConstant(Log2_64(AndRHS->getZExtValue()),
1636 getShiftAmountTy()));
1638 } else if (Cond == ISD::SETEQ && C1 == AndRHS->getZExtValue()) {
1639 // (X & 8) == 8 --> (X & 8) >> 3
1640 // Perform the xform if C1 is a single bit.
1641 if (C1.isPowerOf2()) {
1642 return DAG.getNode(ISD::SRL, VT, N0,
1643 DAG.getConstant(C1.logBase2(), getShiftAmountTy()));
1648 } else if (isa<ConstantSDNode>(N0.getNode())) {
1649 // Ensure that the constant occurs on the RHS.
1650 return DAG.getSetCC(VT, N1, N0, ISD::getSetCCSwappedOperands(Cond));
1653 if (isa<ConstantFPSDNode>(N0.getNode())) {
1654 // Constant fold or commute setcc.
1655 SDValue O = DAG.FoldSetCC(VT, N0, N1, Cond);
1656 if (O.getNode()) return O;
1657 } else if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(N1.getNode())) {
1658 // If the RHS of an FP comparison is a constant, simplify it away in
1660 if (CFP->getValueAPF().isNaN()) {
1661 // If an operand is known to be a nan, we can fold it.
1662 switch (ISD::getUnorderedFlavor(Cond)) {
1663 default: assert(0 && "Unknown flavor!");
1664 case 0: // Known false.
1665 return DAG.getConstant(0, VT);
1666 case 1: // Known true.
1667 return DAG.getConstant(1, VT);
1668 case 2: // Undefined.
1669 return DAG.getNode(ISD::UNDEF, VT);
1673 // Otherwise, we know the RHS is not a NaN. Simplify the node to drop the
1674 // constant if knowing that the operand is non-nan is enough. We prefer to
1675 // have SETO(x,x) instead of SETO(x, 0.0) because this avoids having to
1677 if (Cond == ISD::SETO || Cond == ISD::SETUO)
1678 return DAG.getSetCC(VT, N0, N0, Cond);
1682 // We can always fold X == X for integer setcc's.
1683 if (N0.getValueType().isInteger())
1684 return DAG.getConstant(ISD::isTrueWhenEqual(Cond), VT);
1685 unsigned UOF = ISD::getUnorderedFlavor(Cond);
1686 if (UOF == 2) // FP operators that are undefined on NaNs.
1687 return DAG.getConstant(ISD::isTrueWhenEqual(Cond), VT);
1688 if (UOF == unsigned(ISD::isTrueWhenEqual(Cond)))
1689 return DAG.getConstant(UOF, VT);
1690 // Otherwise, we can't fold it. However, we can simplify it to SETUO/SETO
1691 // if it is not already.
1692 ISD::CondCode NewCond = UOF == 0 ? ISD::SETO : ISD::SETUO;
1693 if (NewCond != Cond)
1694 return DAG.getSetCC(VT, N0, N1, NewCond);
1697 if ((Cond == ISD::SETEQ || Cond == ISD::SETNE) &&
1698 N0.getValueType().isInteger()) {
1699 if (N0.getOpcode() == ISD::ADD || N0.getOpcode() == ISD::SUB ||
1700 N0.getOpcode() == ISD::XOR) {
1701 // Simplify (X+Y) == (X+Z) --> Y == Z
1702 if (N0.getOpcode() == N1.getOpcode()) {
1703 if (N0.getOperand(0) == N1.getOperand(0))
1704 return DAG.getSetCC(VT, N0.getOperand(1), N1.getOperand(1), Cond);
1705 if (N0.getOperand(1) == N1.getOperand(1))
1706 return DAG.getSetCC(VT, N0.getOperand(0), N1.getOperand(0), Cond);
1707 if (DAG.isCommutativeBinOp(N0.getOpcode())) {
1708 // If X op Y == Y op X, try other combinations.
1709 if (N0.getOperand(0) == N1.getOperand(1))
1710 return DAG.getSetCC(VT, N0.getOperand(1), N1.getOperand(0), Cond);
1711 if (N0.getOperand(1) == N1.getOperand(0))
1712 return DAG.getSetCC(VT, N0.getOperand(0), N1.getOperand(1), Cond);
1716 if (ConstantSDNode *RHSC = dyn_cast<ConstantSDNode>(N1)) {
1717 if (ConstantSDNode *LHSR = dyn_cast<ConstantSDNode>(N0.getOperand(1))) {
1718 // Turn (X+C1) == C2 --> X == C2-C1
1719 if (N0.getOpcode() == ISD::ADD && N0.getNode()->hasOneUse()) {
1720 return DAG.getSetCC(VT, N0.getOperand(0),
1721 DAG.getConstant(RHSC->getAPIntValue()-
1722 LHSR->getAPIntValue(),
1723 N0.getValueType()), Cond);
1726 // Turn (X^C1) == C2 into X == C1^C2 iff X&~C1 = 0.
1727 if (N0.getOpcode() == ISD::XOR)
1728 // If we know that all of the inverted bits are zero, don't bother
1729 // performing the inversion.
1730 if (DAG.MaskedValueIsZero(N0.getOperand(0), ~LHSR->getAPIntValue()))
1732 DAG.getSetCC(VT, N0.getOperand(0),
1733 DAG.getConstant(LHSR->getAPIntValue() ^
1734 RHSC->getAPIntValue(),
1739 // Turn (C1-X) == C2 --> X == C1-C2
1740 if (ConstantSDNode *SUBC = dyn_cast<ConstantSDNode>(N0.getOperand(0))) {
1741 if (N0.getOpcode() == ISD::SUB && N0.getNode()->hasOneUse()) {
1743 DAG.getSetCC(VT, N0.getOperand(1),
1744 DAG.getConstant(SUBC->getAPIntValue() -
1745 RHSC->getAPIntValue(),
1752 // Simplify (X+Z) == X --> Z == 0
1753 if (N0.getOperand(0) == N1)
1754 return DAG.getSetCC(VT, N0.getOperand(1),
1755 DAG.getConstant(0, N0.getValueType()), Cond);
1756 if (N0.getOperand(1) == N1) {
1757 if (DAG.isCommutativeBinOp(N0.getOpcode()))
1758 return DAG.getSetCC(VT, N0.getOperand(0),
1759 DAG.getConstant(0, N0.getValueType()), Cond);
1760 else if (N0.getNode()->hasOneUse()) {
1761 assert(N0.getOpcode() == ISD::SUB && "Unexpected operation!");
1762 // (Z-X) == X --> Z == X<<1
1763 SDValue SH = DAG.getNode(ISD::SHL, N1.getValueType(),
1765 DAG.getConstant(1, getShiftAmountTy()));
1766 if (!DCI.isCalledByLegalizer())
1767 DCI.AddToWorklist(SH.getNode());
1768 return DAG.getSetCC(VT, N0.getOperand(0), SH, Cond);
1773 if (N1.getOpcode() == ISD::ADD || N1.getOpcode() == ISD::SUB ||
1774 N1.getOpcode() == ISD::XOR) {
1775 // Simplify X == (X+Z) --> Z == 0
1776 if (N1.getOperand(0) == N0) {
1777 return DAG.getSetCC(VT, N1.getOperand(1),
1778 DAG.getConstant(0, N1.getValueType()), Cond);
1779 } else if (N1.getOperand(1) == N0) {
1780 if (DAG.isCommutativeBinOp(N1.getOpcode())) {
1781 return DAG.getSetCC(VT, N1.getOperand(0),
1782 DAG.getConstant(0, N1.getValueType()), Cond);
1783 } else if (N1.getNode()->hasOneUse()) {
1784 assert(N1.getOpcode() == ISD::SUB && "Unexpected operation!");
1785 // X == (Z-X) --> X<<1 == Z
1786 SDValue SH = DAG.getNode(ISD::SHL, N1.getValueType(), N0,
1787 DAG.getConstant(1, getShiftAmountTy()));
1788 if (!DCI.isCalledByLegalizer())
1789 DCI.AddToWorklist(SH.getNode());
1790 return DAG.getSetCC(VT, SH, N1.getOperand(0), Cond);
1796 // Fold away ALL boolean setcc's.
1798 if (N0.getValueType() == MVT::i1 && foldBooleans) {
1800 default: assert(0 && "Unknown integer setcc!");
1801 case ISD::SETEQ: // X == Y -> ~(X^Y)
1802 Temp = DAG.getNode(ISD::XOR, MVT::i1, N0, N1);
1803 N0 = DAG.getNOT(Temp, MVT::i1);
1804 if (!DCI.isCalledByLegalizer())
1805 DCI.AddToWorklist(Temp.getNode());
1807 case ISD::SETNE: // X != Y --> (X^Y)
1808 N0 = DAG.getNode(ISD::XOR, MVT::i1, N0, N1);
1810 case ISD::SETGT: // X >s Y --> X == 0 & Y == 1 --> ~X & Y
1811 case ISD::SETULT: // X <u Y --> X == 0 & Y == 1 --> ~X & Y
1812 Temp = DAG.getNOT(N0, MVT::i1);
1813 N0 = DAG.getNode(ISD::AND, MVT::i1, N1, Temp);
1814 if (!DCI.isCalledByLegalizer())
1815 DCI.AddToWorklist(Temp.getNode());
1817 case ISD::SETLT: // X <s Y --> X == 1 & Y == 0 --> ~Y & X
1818 case ISD::SETUGT: // X >u Y --> X == 1 & Y == 0 --> ~Y & X
1819 Temp = DAG.getNOT(N1, MVT::i1);
1820 N0 = DAG.getNode(ISD::AND, MVT::i1, N0, Temp);
1821 if (!DCI.isCalledByLegalizer())
1822 DCI.AddToWorklist(Temp.getNode());
1824 case ISD::SETULE: // X <=u Y --> X == 0 | Y == 1 --> ~X | Y
1825 case ISD::SETGE: // X >=s Y --> X == 0 | Y == 1 --> ~X | Y
1826 Temp = DAG.getNOT(N0, MVT::i1);
1827 N0 = DAG.getNode(ISD::OR, MVT::i1, N1, Temp);
1828 if (!DCI.isCalledByLegalizer())
1829 DCI.AddToWorklist(Temp.getNode());
1831 case ISD::SETUGE: // X >=u Y --> X == 1 | Y == 0 --> ~Y | X
1832 case ISD::SETLE: // X <=s Y --> X == 1 | Y == 0 --> ~Y | X
1833 Temp = DAG.getNOT(N1, MVT::i1);
1834 N0 = DAG.getNode(ISD::OR, MVT::i1, N0, Temp);
1837 if (VT != MVT::i1) {
1838 if (!DCI.isCalledByLegalizer())
1839 DCI.AddToWorklist(N0.getNode());
1840 // FIXME: If running after legalize, we probably can't do this.
1841 N0 = DAG.getNode(ISD::ZERO_EXTEND, VT, N0);
1846 // Could not fold it.
1850 /// isGAPlusOffset - Returns true (and the GlobalValue and the offset) if the
1851 /// node is a GlobalAddress + offset.
1852 bool TargetLowering::isGAPlusOffset(SDNode *N, GlobalValue* &GA,
1853 int64_t &Offset) const {
1854 if (isa<GlobalAddressSDNode>(N)) {
1855 GlobalAddressSDNode *GASD = cast<GlobalAddressSDNode>(N);
1856 GA = GASD->getGlobal();
1857 Offset += GASD->getOffset();
1861 if (N->getOpcode() == ISD::ADD) {
1862 SDValue N1 = N->getOperand(0);
1863 SDValue N2 = N->getOperand(1);
1864 if (isGAPlusOffset(N1.getNode(), GA, Offset)) {
1865 ConstantSDNode *V = dyn_cast<ConstantSDNode>(N2);
1867 Offset += V->getSExtValue();
1870 } else if (isGAPlusOffset(N2.getNode(), GA, Offset)) {
1871 ConstantSDNode *V = dyn_cast<ConstantSDNode>(N1);
1873 Offset += V->getSExtValue();
1882 /// isConsecutiveLoad - Return true if LD (which must be a LoadSDNode) is
1883 /// loading 'Bytes' bytes from a location that is 'Dist' units away from the
1884 /// location that the 'Base' load is loading from.
1885 bool TargetLowering::isConsecutiveLoad(SDNode *LD, SDNode *Base,
1886 unsigned Bytes, int Dist,
1887 const MachineFrameInfo *MFI) const {
1888 if (LD->getOperand(0).getNode() != Base->getOperand(0).getNode())
1890 MVT VT = LD->getValueType(0);
1891 if (VT.getSizeInBits() / 8 != Bytes)
1894 SDValue Loc = LD->getOperand(1);
1895 SDValue BaseLoc = Base->getOperand(1);
1896 if (Loc.getOpcode() == ISD::FrameIndex) {
1897 if (BaseLoc.getOpcode() != ISD::FrameIndex)
1899 int FI = cast<FrameIndexSDNode>(Loc)->getIndex();
1900 int BFI = cast<FrameIndexSDNode>(BaseLoc)->getIndex();
1901 int FS = MFI->getObjectSize(FI);
1902 int BFS = MFI->getObjectSize(BFI);
1903 if (FS != BFS || FS != (int)Bytes) return false;
1904 return MFI->getObjectOffset(FI) == (MFI->getObjectOffset(BFI) + Dist*Bytes);
1907 GlobalValue *GV1 = NULL;
1908 GlobalValue *GV2 = NULL;
1909 int64_t Offset1 = 0;
1910 int64_t Offset2 = 0;
1911 bool isGA1 = isGAPlusOffset(Loc.getNode(), GV1, Offset1);
1912 bool isGA2 = isGAPlusOffset(BaseLoc.getNode(), GV2, Offset2);
1913 if (isGA1 && isGA2 && GV1 == GV2)
1914 return Offset1 == (Offset2 + Dist*Bytes);
1919 SDValue TargetLowering::
1920 PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const {
1921 // Default implementation: no optimization.
1925 //===----------------------------------------------------------------------===//
1926 // Inline Assembler Implementation Methods
1927 //===----------------------------------------------------------------------===//
1930 TargetLowering::ConstraintType
1931 TargetLowering::getConstraintType(const std::string &Constraint) const {
1932 // FIXME: lots more standard ones to handle.
1933 if (Constraint.size() == 1) {
1934 switch (Constraint[0]) {
1936 case 'r': return C_RegisterClass;
1938 case 'o': // offsetable
1939 case 'V': // not offsetable
1941 case 'i': // Simple Integer or Relocatable Constant
1942 case 'n': // Simple Integer
1943 case 's': // Relocatable Constant
1944 case 'X': // Allow ANY value.
1945 case 'I': // Target registers.
1957 if (Constraint.size() > 1 && Constraint[0] == '{' &&
1958 Constraint[Constraint.size()-1] == '}')
1963 /// LowerXConstraint - try to replace an X constraint, which matches anything,
1964 /// with another that has more specific requirements based on the type of the
1965 /// corresponding operand.
1966 const char *TargetLowering::LowerXConstraint(MVT ConstraintVT) const{
1967 if (ConstraintVT.isInteger())
1969 if (ConstraintVT.isFloatingPoint())
1970 return "f"; // works for many targets
1974 /// LowerAsmOperandForConstraint - Lower the specified operand into the Ops
1975 /// vector. If it is invalid, don't add anything to Ops.
1976 void TargetLowering::LowerAsmOperandForConstraint(SDValue Op,
1977 char ConstraintLetter,
1979 std::vector<SDValue> &Ops,
1980 SelectionDAG &DAG) const {
1981 switch (ConstraintLetter) {
1983 case 'X': // Allows any operand; labels (basic block) use this.
1984 if (Op.getOpcode() == ISD::BasicBlock) {
1989 case 'i': // Simple Integer or Relocatable Constant
1990 case 'n': // Simple Integer
1991 case 's': { // Relocatable Constant
1992 // These operands are interested in values of the form (GV+C), where C may
1993 // be folded in as an offset of GV, or it may be explicitly added. Also, it
1994 // is possible and fine if either GV or C are missing.
1995 ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op);
1996 GlobalAddressSDNode *GA = dyn_cast<GlobalAddressSDNode>(Op);
1998 // If we have "(add GV, C)", pull out GV/C
1999 if (Op.getOpcode() == ISD::ADD) {
2000 C = dyn_cast<ConstantSDNode>(Op.getOperand(1));
2001 GA = dyn_cast<GlobalAddressSDNode>(Op.getOperand(0));
2002 if (C == 0 || GA == 0) {
2003 C = dyn_cast<ConstantSDNode>(Op.getOperand(0));
2004 GA = dyn_cast<GlobalAddressSDNode>(Op.getOperand(1));
2006 if (C == 0 || GA == 0)
2010 // If we find a valid operand, map to the TargetXXX version so that the
2011 // value itself doesn't get selected.
2012 if (GA) { // Either &GV or &GV+C
2013 if (ConstraintLetter != 'n') {
2014 int64_t Offs = GA->getOffset();
2015 if (C) Offs += C->getZExtValue();
2016 Ops.push_back(DAG.getTargetGlobalAddress(GA->getGlobal(),
2017 Op.getValueType(), Offs));
2021 if (C) { // just C, no GV.
2022 // Simple constants are not allowed for 's'.
2023 if (ConstraintLetter != 's') {
2024 Ops.push_back(DAG.getTargetConstant(C->getAPIntValue(),
2025 Op.getValueType()));
2034 std::vector<unsigned> TargetLowering::
2035 getRegClassForInlineAsmConstraint(const std::string &Constraint,
2037 return std::vector<unsigned>();
2041 std::pair<unsigned, const TargetRegisterClass*> TargetLowering::
2042 getRegForInlineAsmConstraint(const std::string &Constraint,
2044 if (Constraint[0] != '{')
2045 return std::pair<unsigned, const TargetRegisterClass*>(0, 0);
2046 assert(*(Constraint.end()-1) == '}' && "Not a brace enclosed constraint?");
2048 // Remove the braces from around the name.
2049 std::string RegName(Constraint.begin()+1, Constraint.end()-1);
2051 // Figure out which register class contains this reg.
2052 const TargetRegisterInfo *RI = TM.getRegisterInfo();
2053 for (TargetRegisterInfo::regclass_iterator RCI = RI->regclass_begin(),
2054 E = RI->regclass_end(); RCI != E; ++RCI) {
2055 const TargetRegisterClass *RC = *RCI;
2057 // If none of the the value types for this register class are valid, we
2058 // can't use it. For example, 64-bit reg classes on 32-bit targets.
2059 bool isLegal = false;
2060 for (TargetRegisterClass::vt_iterator I = RC->vt_begin(), E = RC->vt_end();
2062 if (isTypeLegal(*I)) {
2068 if (!isLegal) continue;
2070 for (TargetRegisterClass::iterator I = RC->begin(), E = RC->end();
2072 if (StringsEqualNoCase(RegName, RI->get(*I).AsmName))
2073 return std::make_pair(*I, RC);
2077 return std::pair<unsigned, const TargetRegisterClass*>(0, 0);
2080 //===----------------------------------------------------------------------===//
2081 // Constraint Selection.
2083 /// isMatchingInputConstraint - Return true of this is an input operand that is
2084 /// a matching constraint like "4".
2085 bool TargetLowering::AsmOperandInfo::isMatchingInputConstraint() const {
2086 assert(!ConstraintCode.empty() && "No known constraint!");
2087 return isdigit(ConstraintCode[0]);
2090 /// getMatchedOperand - If this is an input matching constraint, this method
2091 /// returns the output operand it matches.
2092 unsigned TargetLowering::AsmOperandInfo::getMatchedOperand() const {
2093 assert(!ConstraintCode.empty() && "No known constraint!");
2094 return atoi(ConstraintCode.c_str());
2098 /// getConstraintGenerality - Return an integer indicating how general CT
2100 static unsigned getConstraintGenerality(TargetLowering::ConstraintType CT) {
2102 default: assert(0 && "Unknown constraint type!");
2103 case TargetLowering::C_Other:
2104 case TargetLowering::C_Unknown:
2106 case TargetLowering::C_Register:
2108 case TargetLowering::C_RegisterClass:
2110 case TargetLowering::C_Memory:
2115 /// ChooseConstraint - If there are multiple different constraints that we
2116 /// could pick for this operand (e.g. "imr") try to pick the 'best' one.
2117 /// This is somewhat tricky: constraints fall into four classes:
2118 /// Other -> immediates and magic values
2119 /// Register -> one specific register
2120 /// RegisterClass -> a group of regs
2121 /// Memory -> memory
2122 /// Ideally, we would pick the most specific constraint possible: if we have
2123 /// something that fits into a register, we would pick it. The problem here
2124 /// is that if we have something that could either be in a register or in
2125 /// memory that use of the register could cause selection of *other*
2126 /// operands to fail: they might only succeed if we pick memory. Because of
2127 /// this the heuristic we use is:
2129 /// 1) If there is an 'other' constraint, and if the operand is valid for
2130 /// that constraint, use it. This makes us take advantage of 'i'
2131 /// constraints when available.
2132 /// 2) Otherwise, pick the most general constraint present. This prefers
2133 /// 'm' over 'r', for example.
2135 static void ChooseConstraint(TargetLowering::AsmOperandInfo &OpInfo,
2136 bool hasMemory, const TargetLowering &TLI,
2137 SDValue Op, SelectionDAG *DAG) {
2138 assert(OpInfo.Codes.size() > 1 && "Doesn't have multiple constraint options");
2139 unsigned BestIdx = 0;
2140 TargetLowering::ConstraintType BestType = TargetLowering::C_Unknown;
2141 int BestGenerality = -1;
2143 // Loop over the options, keeping track of the most general one.
2144 for (unsigned i = 0, e = OpInfo.Codes.size(); i != e; ++i) {
2145 TargetLowering::ConstraintType CType =
2146 TLI.getConstraintType(OpInfo.Codes[i]);
2148 // If this is an 'other' constraint, see if the operand is valid for it.
2149 // For example, on X86 we might have an 'rI' constraint. If the operand
2150 // is an integer in the range [0..31] we want to use I (saving a load
2151 // of a register), otherwise we must use 'r'.
2152 if (CType == TargetLowering::C_Other && Op.getNode()) {
2153 assert(OpInfo.Codes[i].size() == 1 &&
2154 "Unhandled multi-letter 'other' constraint");
2155 std::vector<SDValue> ResultOps;
2156 TLI.LowerAsmOperandForConstraint(Op, OpInfo.Codes[i][0], hasMemory,
2158 if (!ResultOps.empty()) {
2165 // This constraint letter is more general than the previous one, use it.
2166 int Generality = getConstraintGenerality(CType);
2167 if (Generality > BestGenerality) {
2170 BestGenerality = Generality;
2174 OpInfo.ConstraintCode = OpInfo.Codes[BestIdx];
2175 OpInfo.ConstraintType = BestType;
2178 /// ComputeConstraintToUse - Determines the constraint code and constraint
2179 /// type to use for the specific AsmOperandInfo, setting
2180 /// OpInfo.ConstraintCode and OpInfo.ConstraintType.
2181 void TargetLowering::ComputeConstraintToUse(AsmOperandInfo &OpInfo,
2184 SelectionDAG *DAG) const {
2185 assert(!OpInfo.Codes.empty() && "Must have at least one constraint");
2187 // Single-letter constraints ('r') are very common.
2188 if (OpInfo.Codes.size() == 1) {
2189 OpInfo.ConstraintCode = OpInfo.Codes[0];
2190 OpInfo.ConstraintType = getConstraintType(OpInfo.ConstraintCode);
2192 ChooseConstraint(OpInfo, hasMemory, *this, Op, DAG);
2195 // 'X' matches anything.
2196 if (OpInfo.ConstraintCode == "X" && OpInfo.CallOperandVal) {
2197 // Labels and constants are handled elsewhere ('X' is the only thing
2198 // that matches labels).
2199 if (isa<BasicBlock>(OpInfo.CallOperandVal) ||
2200 isa<ConstantInt>(OpInfo.CallOperandVal))
2203 // Otherwise, try to resolve it to something we know about by looking at
2204 // the actual operand type.
2205 if (const char *Repl = LowerXConstraint(OpInfo.ConstraintVT)) {
2206 OpInfo.ConstraintCode = Repl;
2207 OpInfo.ConstraintType = getConstraintType(OpInfo.ConstraintCode);
2212 //===----------------------------------------------------------------------===//
2213 // Loop Strength Reduction hooks
2214 //===----------------------------------------------------------------------===//
2216 /// isLegalAddressingMode - Return true if the addressing mode represented
2217 /// by AM is legal for this target, for a load/store of the specified type.
2218 bool TargetLowering::isLegalAddressingMode(const AddrMode &AM,
2219 const Type *Ty) const {
2220 // The default implementation of this implements a conservative RISCy, r+r and
2223 // Allows a sign-extended 16-bit immediate field.
2224 if (AM.BaseOffs <= -(1LL << 16) || AM.BaseOffs >= (1LL << 16)-1)
2227 // No global is ever allowed as a base.
2231 // Only support r+r,
2233 case 0: // "r+i" or just "i", depending on HasBaseReg.
2236 if (AM.HasBaseReg && AM.BaseOffs) // "r+r+i" is not allowed.
2238 // Otherwise we have r+r or r+i.
2241 if (AM.HasBaseReg || AM.BaseOffs) // 2*r+r or 2*r+i is not allowed.
2243 // Allow 2*r as r+r.
2251 APInt m; // magic number
2252 bool a; // add indicator
2253 unsigned s; // shift amount
2256 /// magicu - calculate the magic numbers required to codegen an integer udiv as
2257 /// a sequence of multiply, add and shifts. Requires that the divisor not be 0.
2258 static mu magicu(const APInt& d) {
2260 APInt nc, delta, q1, r1, q2, r2;
2262 magu.a = 0; // initialize "add" indicator
2263 APInt allOnes = APInt::getAllOnesValue(d.getBitWidth());
2264 APInt signedMin = APInt::getSignedMinValue(d.getBitWidth());
2265 APInt signedMax = APInt::getSignedMaxValue(d.getBitWidth());
2267 nc = allOnes - (-d).urem(d);
2268 p = d.getBitWidth() - 1; // initialize p
2269 q1 = signedMin.udiv(nc); // initialize q1 = 2p/nc
2270 r1 = signedMin - q1*nc; // initialize r1 = rem(2p,nc)
2271 q2 = signedMax.udiv(d); // initialize q2 = (2p-1)/d
2272 r2 = signedMax - q2*d; // initialize r2 = rem((2p-1),d)
2275 if (r1.uge(nc - r1)) {
2276 q1 = q1 + q1 + 1; // update q1
2277 r1 = r1 + r1 - nc; // update r1
2280 q1 = q1+q1; // update q1
2281 r1 = r1+r1; // update r1
2283 if ((r2 + 1).uge(d - r2)) {
2284 if (q2.uge(signedMax)) magu.a = 1;
2285 q2 = q2+q2 + 1; // update q2
2286 r2 = r2+r2 + 1 - d; // update r2
2289 if (q2.uge(signedMin)) magu.a = 1;
2290 q2 = q2+q2; // update q2
2291 r2 = r2+r2 + 1; // update r2
2294 } while (p < d.getBitWidth()*2 &&
2295 (q1.ult(delta) || (q1 == delta && r1 == 0)));
2296 magu.m = q2 + 1; // resulting magic number
2297 magu.s = p - d.getBitWidth(); // resulting shift
2301 // Magic for divide replacement
2303 APInt m; // magic number
2304 unsigned s; // shift amount
2307 /// magic - calculate the magic numbers required to codegen an integer sdiv as
2308 /// a sequence of multiply and shifts. Requires that the divisor not be 0, 1,
2310 static ms magic(const APInt& d) {
2312 APInt ad, anc, delta, q1, r1, q2, r2, t;
2313 APInt allOnes = APInt::getAllOnesValue(d.getBitWidth());
2314 APInt signedMin = APInt::getSignedMinValue(d.getBitWidth());
2315 APInt signedMax = APInt::getSignedMaxValue(d.getBitWidth());
2319 t = signedMin + (d.lshr(d.getBitWidth() - 1));
2320 anc = t - 1 - t.urem(ad); // absolute value of nc
2321 p = d.getBitWidth() - 1; // initialize p
2322 q1 = signedMin.udiv(anc); // initialize q1 = 2p/abs(nc)
2323 r1 = signedMin - q1*anc; // initialize r1 = rem(2p,abs(nc))
2324 q2 = signedMin.udiv(ad); // initialize q2 = 2p/abs(d)
2325 r2 = signedMin - q2*ad; // initialize r2 = rem(2p,abs(d))
2328 q1 = q1<<1; // update q1 = 2p/abs(nc)
2329 r1 = r1<<1; // update r1 = rem(2p/abs(nc))
2330 if (r1.uge(anc)) { // must be unsigned comparison
2334 q2 = q2<<1; // update q2 = 2p/abs(d)
2335 r2 = r2<<1; // update r2 = rem(2p/abs(d))
2336 if (r2.uge(ad)) { // must be unsigned comparison
2341 } while (q1.ule(delta) || (q1 == delta && r1 == 0));
2344 if (d.isNegative()) mag.m = -mag.m; // resulting magic number
2345 mag.s = p - d.getBitWidth(); // resulting shift
2349 /// BuildSDIVSequence - Given an ISD::SDIV node expressing a divide by constant,
2350 /// return a DAG expression to select that will generate the same value by
2351 /// multiplying by a magic number. See:
2352 /// <http://the.wall.riscom.net/books/proc/ppc/cwg/code2.html>
2353 SDValue TargetLowering::BuildSDIV(SDNode *N, SelectionDAG &DAG,
2354 std::vector<SDNode*>* Created) const {
2355 MVT VT = N->getValueType(0);
2357 // Check to see if we can do this.
2358 // FIXME: We should be more aggressive here.
2359 if (!isTypeLegal(VT))
2362 APInt d = cast<ConstantSDNode>(N->getOperand(1))->getAPIntValue();
2363 ms magics = magic(d);
2365 // Multiply the numerator (operand 0) by the magic value
2366 // FIXME: We should support doing a MUL in a wider type
2368 if (isOperationLegalOrCustom(ISD::MULHS, VT))
2369 Q = DAG.getNode(ISD::MULHS, VT, N->getOperand(0),
2370 DAG.getConstant(magics.m, VT));
2371 else if (isOperationLegalOrCustom(ISD::SMUL_LOHI, VT))
2372 Q = SDValue(DAG.getNode(ISD::SMUL_LOHI, DAG.getVTList(VT, VT),
2374 DAG.getConstant(magics.m, VT)).getNode(), 1);
2376 return SDValue(); // No mulhs or equvialent
2377 // If d > 0 and m < 0, add the numerator
2378 if (d.isStrictlyPositive() && magics.m.isNegative()) {
2379 Q = DAG.getNode(ISD::ADD, VT, Q, N->getOperand(0));
2381 Created->push_back(Q.getNode());
2383 // If d < 0 and m > 0, subtract the numerator.
2384 if (d.isNegative() && magics.m.isStrictlyPositive()) {
2385 Q = DAG.getNode(ISD::SUB, VT, Q, N->getOperand(0));
2387 Created->push_back(Q.getNode());
2389 // Shift right algebraic if shift value is nonzero
2391 Q = DAG.getNode(ISD::SRA, VT, Q,
2392 DAG.getConstant(magics.s, getShiftAmountTy()));
2394 Created->push_back(Q.getNode());
2396 // Extract the sign bit and add it to the quotient
2398 DAG.getNode(ISD::SRL, VT, Q, DAG.getConstant(VT.getSizeInBits()-1,
2399 getShiftAmountTy()));
2401 Created->push_back(T.getNode());
2402 return DAG.getNode(ISD::ADD, VT, Q, T);
2405 /// BuildUDIVSequence - Given an ISD::UDIV node expressing a divide by constant,
2406 /// return a DAG expression to select that will generate the same value by
2407 /// multiplying by a magic number. See:
2408 /// <http://the.wall.riscom.net/books/proc/ppc/cwg/code2.html>
2409 SDValue TargetLowering::BuildUDIV(SDNode *N, SelectionDAG &DAG,
2410 std::vector<SDNode*>* Created) const {
2411 MVT VT = N->getValueType(0);
2413 // Check to see if we can do this.
2414 // FIXME: We should be more aggressive here.
2415 if (!isTypeLegal(VT))
2418 // FIXME: We should use a narrower constant when the upper
2419 // bits are known to be zero.
2420 ConstantSDNode *N1C = cast<ConstantSDNode>(N->getOperand(1));
2421 mu magics = magicu(N1C->getAPIntValue());
2423 // Multiply the numerator (operand 0) by the magic value
2424 // FIXME: We should support doing a MUL in a wider type
2426 if (isOperationLegalOrCustom(ISD::MULHU, VT))
2427 Q = DAG.getNode(ISD::MULHU, VT, N->getOperand(0),
2428 DAG.getConstant(magics.m, VT));
2429 else if (isOperationLegalOrCustom(ISD::UMUL_LOHI, VT))
2430 Q = SDValue(DAG.getNode(ISD::UMUL_LOHI, DAG.getVTList(VT, VT),
2432 DAG.getConstant(magics.m, VT)).getNode(), 1);
2434 return SDValue(); // No mulhu or equvialent
2436 Created->push_back(Q.getNode());
2438 if (magics.a == 0) {
2439 assert(magics.s < N1C->getAPIntValue().getBitWidth() &&
2440 "We shouldn't generate an undefined shift!");
2441 return DAG.getNode(ISD::SRL, VT, Q,
2442 DAG.getConstant(magics.s, getShiftAmountTy()));
2444 SDValue NPQ = DAG.getNode(ISD::SUB, VT, N->getOperand(0), Q);
2446 Created->push_back(NPQ.getNode());
2447 NPQ = DAG.getNode(ISD::SRL, VT, NPQ,
2448 DAG.getConstant(1, getShiftAmountTy()));
2450 Created->push_back(NPQ.getNode());
2451 NPQ = DAG.getNode(ISD::ADD, VT, NPQ, Q);
2453 Created->push_back(NPQ.getNode());
2454 return DAG.getNode(ISD::SRL, VT, NPQ,
2455 DAG.getConstant(magics.s-1, getShiftAmountTy()));