1 //===-- ARMISelLowering.cpp - ARM DAG Lowering Implementation -------------===//
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 file defines the interfaces that ARM uses to lower LLVM code into a
13 //===----------------------------------------------------------------------===//
16 #include "ARMAddressingModes.h"
17 #include "ARMConstantPoolValue.h"
18 #include "ARMISelLowering.h"
19 #include "ARMMachineFunctionInfo.h"
20 #include "ARMRegisterInfo.h"
21 #include "ARMSubtarget.h"
22 #include "ARMTargetMachine.h"
23 #include "llvm/CallingConv.h"
24 #include "llvm/Constants.h"
25 #include "llvm/Function.h"
26 #include "llvm/Instruction.h"
27 #include "llvm/Intrinsics.h"
28 #include "llvm/GlobalValue.h"
29 #include "llvm/CodeGen/CallingConvLower.h"
30 #include "llvm/CodeGen/MachineBasicBlock.h"
31 #include "llvm/CodeGen/MachineFrameInfo.h"
32 #include "llvm/CodeGen/MachineFunction.h"
33 #include "llvm/CodeGen/MachineInstrBuilder.h"
34 #include "llvm/CodeGen/MachineRegisterInfo.h"
35 #include "llvm/CodeGen/PseudoSourceValue.h"
36 #include "llvm/CodeGen/SelectionDAG.h"
37 #include "llvm/Target/TargetOptions.h"
38 #include "llvm/ADT/VectorExtras.h"
39 #include "llvm/Support/MathExtras.h"
42 static bool CC_ARM_APCS_Custom_f64(unsigned &ValNo, MVT &ValVT, MVT &LocVT,
43 CCValAssign::LocInfo &LocInfo,
44 ISD::ArgFlagsTy &ArgFlags,
46 static bool CC_ARM_AAPCS_Custom_f64(unsigned &ValNo, MVT &ValVT, MVT &LocVT,
47 CCValAssign::LocInfo &LocInfo,
48 ISD::ArgFlagsTy &ArgFlags,
50 static bool RetCC_ARM_APCS_Custom_f64(unsigned &ValNo, MVT &ValVT, MVT &LocVT,
51 CCValAssign::LocInfo &LocInfo,
52 ISD::ArgFlagsTy &ArgFlags,
54 static bool RetCC_ARM_AAPCS_Custom_f64(unsigned &ValNo, MVT &ValVT, MVT &LocVT,
55 CCValAssign::LocInfo &LocInfo,
56 ISD::ArgFlagsTy &ArgFlags,
59 ARMTargetLowering::ARMTargetLowering(TargetMachine &TM)
60 : TargetLowering(TM), ARMPCLabelIndex(0) {
61 Subtarget = &TM.getSubtarget<ARMSubtarget>();
63 if (Subtarget->isTargetDarwin()) {
64 // Uses VFP for Thumb libfuncs if available.
65 if (Subtarget->isThumb() && Subtarget->hasVFP2()) {
66 // Single-precision floating-point arithmetic.
67 setLibcallName(RTLIB::ADD_F32, "__addsf3vfp");
68 setLibcallName(RTLIB::SUB_F32, "__subsf3vfp");
69 setLibcallName(RTLIB::MUL_F32, "__mulsf3vfp");
70 setLibcallName(RTLIB::DIV_F32, "__divsf3vfp");
72 // Double-precision floating-point arithmetic.
73 setLibcallName(RTLIB::ADD_F64, "__adddf3vfp");
74 setLibcallName(RTLIB::SUB_F64, "__subdf3vfp");
75 setLibcallName(RTLIB::MUL_F64, "__muldf3vfp");
76 setLibcallName(RTLIB::DIV_F64, "__divdf3vfp");
78 // Single-precision comparisons.
79 setLibcallName(RTLIB::OEQ_F32, "__eqsf2vfp");
80 setLibcallName(RTLIB::UNE_F32, "__nesf2vfp");
81 setLibcallName(RTLIB::OLT_F32, "__ltsf2vfp");
82 setLibcallName(RTLIB::OLE_F32, "__lesf2vfp");
83 setLibcallName(RTLIB::OGE_F32, "__gesf2vfp");
84 setLibcallName(RTLIB::OGT_F32, "__gtsf2vfp");
85 setLibcallName(RTLIB::UO_F32, "__unordsf2vfp");
86 setLibcallName(RTLIB::O_F32, "__unordsf2vfp");
88 setCmpLibcallCC(RTLIB::OEQ_F32, ISD::SETNE);
89 setCmpLibcallCC(RTLIB::UNE_F32, ISD::SETNE);
90 setCmpLibcallCC(RTLIB::OLT_F32, ISD::SETNE);
91 setCmpLibcallCC(RTLIB::OLE_F32, ISD::SETNE);
92 setCmpLibcallCC(RTLIB::OGE_F32, ISD::SETNE);
93 setCmpLibcallCC(RTLIB::OGT_F32, ISD::SETNE);
94 setCmpLibcallCC(RTLIB::UO_F32, ISD::SETNE);
95 setCmpLibcallCC(RTLIB::O_F32, ISD::SETEQ);
97 // Double-precision comparisons.
98 setLibcallName(RTLIB::OEQ_F64, "__eqdf2vfp");
99 setLibcallName(RTLIB::UNE_F64, "__nedf2vfp");
100 setLibcallName(RTLIB::OLT_F64, "__ltdf2vfp");
101 setLibcallName(RTLIB::OLE_F64, "__ledf2vfp");
102 setLibcallName(RTLIB::OGE_F64, "__gedf2vfp");
103 setLibcallName(RTLIB::OGT_F64, "__gtdf2vfp");
104 setLibcallName(RTLIB::UO_F64, "__unorddf2vfp");
105 setLibcallName(RTLIB::O_F64, "__unorddf2vfp");
107 setCmpLibcallCC(RTLIB::OEQ_F64, ISD::SETNE);
108 setCmpLibcallCC(RTLIB::UNE_F64, ISD::SETNE);
109 setCmpLibcallCC(RTLIB::OLT_F64, ISD::SETNE);
110 setCmpLibcallCC(RTLIB::OLE_F64, ISD::SETNE);
111 setCmpLibcallCC(RTLIB::OGE_F64, ISD::SETNE);
112 setCmpLibcallCC(RTLIB::OGT_F64, ISD::SETNE);
113 setCmpLibcallCC(RTLIB::UO_F64, ISD::SETNE);
114 setCmpLibcallCC(RTLIB::O_F64, ISD::SETEQ);
116 // Floating-point to integer conversions.
117 // i64 conversions are done via library routines even when generating VFP
118 // instructions, so use the same ones.
119 setLibcallName(RTLIB::FPTOSINT_F64_I32, "__fixdfsivfp");
120 setLibcallName(RTLIB::FPTOUINT_F64_I32, "__fixunsdfsivfp");
121 setLibcallName(RTLIB::FPTOSINT_F32_I32, "__fixsfsivfp");
122 setLibcallName(RTLIB::FPTOUINT_F32_I32, "__fixunssfsivfp");
124 // Conversions between floating types.
125 setLibcallName(RTLIB::FPROUND_F64_F32, "__truncdfsf2vfp");
126 setLibcallName(RTLIB::FPEXT_F32_F64, "__extendsfdf2vfp");
128 // Integer to floating-point conversions.
129 // i64 conversions are done via library routines even when generating VFP
130 // instructions, so use the same ones.
131 // FIXME: There appears to be some naming inconsistency in ARM libgcc:
132 // e.g., __floatunsidf vs. __floatunssidfvfp.
133 setLibcallName(RTLIB::SINTTOFP_I32_F64, "__floatsidfvfp");
134 setLibcallName(RTLIB::UINTTOFP_I32_F64, "__floatunssidfvfp");
135 setLibcallName(RTLIB::SINTTOFP_I32_F32, "__floatsisfvfp");
136 setLibcallName(RTLIB::UINTTOFP_I32_F32, "__floatunssisfvfp");
140 if (Subtarget->isThumb())
141 addRegisterClass(MVT::i32, ARM::tGPRRegisterClass);
143 addRegisterClass(MVT::i32, ARM::GPRRegisterClass);
144 if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb()) {
145 addRegisterClass(MVT::f32, ARM::SPRRegisterClass);
146 addRegisterClass(MVT::f64, ARM::DPRRegisterClass);
148 setTruncStoreAction(MVT::f64, MVT::f32, Expand);
150 computeRegisterProperties();
152 // ARM does not have f32 extending load.
153 setLoadExtAction(ISD::EXTLOAD, MVT::f32, Expand);
155 // ARM does not have i1 sign extending load.
156 setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Promote);
158 // ARM supports all 4 flavors of integer indexed load / store.
159 for (unsigned im = (unsigned)ISD::PRE_INC;
160 im != (unsigned)ISD::LAST_INDEXED_MODE; ++im) {
161 setIndexedLoadAction(im, MVT::i1, Legal);
162 setIndexedLoadAction(im, MVT::i8, Legal);
163 setIndexedLoadAction(im, MVT::i16, Legal);
164 setIndexedLoadAction(im, MVT::i32, Legal);
165 setIndexedStoreAction(im, MVT::i1, Legal);
166 setIndexedStoreAction(im, MVT::i8, Legal);
167 setIndexedStoreAction(im, MVT::i16, Legal);
168 setIndexedStoreAction(im, MVT::i32, Legal);
171 // i64 operation support.
172 if (Subtarget->isThumb()) {
173 setOperationAction(ISD::MUL, MVT::i64, Expand);
174 setOperationAction(ISD::MULHU, MVT::i32, Expand);
175 setOperationAction(ISD::MULHS, MVT::i32, Expand);
176 setOperationAction(ISD::UMUL_LOHI, MVT::i32, Expand);
177 setOperationAction(ISD::SMUL_LOHI, MVT::i32, Expand);
179 setOperationAction(ISD::MUL, MVT::i64, Expand);
180 setOperationAction(ISD::MULHU, MVT::i32, Expand);
181 if (!Subtarget->hasV6Ops())
182 setOperationAction(ISD::MULHS, MVT::i32, Expand);
184 setOperationAction(ISD::SHL_PARTS, MVT::i32, Expand);
185 setOperationAction(ISD::SRA_PARTS, MVT::i32, Expand);
186 setOperationAction(ISD::SRL_PARTS, MVT::i32, Expand);
187 setOperationAction(ISD::SRL, MVT::i64, Custom);
188 setOperationAction(ISD::SRA, MVT::i64, Custom);
190 // ARM does not have ROTL.
191 setOperationAction(ISD::ROTL, MVT::i32, Expand);
192 setOperationAction(ISD::CTTZ, MVT::i32, Expand);
193 setOperationAction(ISD::CTPOP, MVT::i32, Expand);
194 if (!Subtarget->hasV5TOps() || Subtarget->isThumb())
195 setOperationAction(ISD::CTLZ, MVT::i32, Expand);
197 // Only ARMv6 has BSWAP.
198 if (!Subtarget->hasV6Ops())
199 setOperationAction(ISD::BSWAP, MVT::i32, Expand);
201 // These are expanded into libcalls.
202 setOperationAction(ISD::SDIV, MVT::i32, Expand);
203 setOperationAction(ISD::UDIV, MVT::i32, Expand);
204 setOperationAction(ISD::SREM, MVT::i32, Expand);
205 setOperationAction(ISD::UREM, MVT::i32, Expand);
206 setOperationAction(ISD::SDIVREM, MVT::i32, Expand);
207 setOperationAction(ISD::UDIVREM, MVT::i32, Expand);
209 // Support label based line numbers.
210 setOperationAction(ISD::DBG_STOPPOINT, MVT::Other, Expand);
211 setOperationAction(ISD::DEBUG_LOC, MVT::Other, Expand);
213 setOperationAction(ISD::RET, MVT::Other, Custom);
214 setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
215 setOperationAction(ISD::ConstantPool, MVT::i32, Custom);
216 setOperationAction(ISD::GLOBAL_OFFSET_TABLE, MVT::i32, Custom);
217 setOperationAction(ISD::GlobalTLSAddress, MVT::i32, Custom);
219 // Use the default implementation.
220 setOperationAction(ISD::VASTART, MVT::Other, Custom);
221 setOperationAction(ISD::VAARG, MVT::Other, Expand);
222 setOperationAction(ISD::VACOPY, MVT::Other, Expand);
223 setOperationAction(ISD::VAEND, MVT::Other, Expand);
224 setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
225 setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
226 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32, Expand);
227 setOperationAction(ISD::MEMBARRIER, MVT::Other, Expand);
229 if (!Subtarget->hasV6Ops()) {
230 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i16, Expand);
231 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i8, Expand);
233 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
235 if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb())
236 // Turn f64->i64 into FMRRD, i64 -> f64 to FMDRR iff target supports vfp2.
237 setOperationAction(ISD::BIT_CONVERT, MVT::i64, Custom);
239 // We want to custom lower some of our intrinsics.
240 setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom);
242 setOperationAction(ISD::SETCC, MVT::i32, Expand);
243 setOperationAction(ISD::SETCC, MVT::f32, Expand);
244 setOperationAction(ISD::SETCC, MVT::f64, Expand);
245 setOperationAction(ISD::SELECT, MVT::i32, Expand);
246 setOperationAction(ISD::SELECT, MVT::f32, Expand);
247 setOperationAction(ISD::SELECT, MVT::f64, Expand);
248 setOperationAction(ISD::SELECT_CC, MVT::i32, Custom);
249 setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
250 setOperationAction(ISD::SELECT_CC, MVT::f64, Custom);
252 setOperationAction(ISD::BRCOND, MVT::Other, Expand);
253 setOperationAction(ISD::BR_CC, MVT::i32, Custom);
254 setOperationAction(ISD::BR_CC, MVT::f32, Custom);
255 setOperationAction(ISD::BR_CC, MVT::f64, Custom);
256 setOperationAction(ISD::BR_JT, MVT::Other, Custom);
258 // We don't support sin/cos/fmod/copysign/pow
259 setOperationAction(ISD::FSIN, MVT::f64, Expand);
260 setOperationAction(ISD::FSIN, MVT::f32, Expand);
261 setOperationAction(ISD::FCOS, MVT::f32, Expand);
262 setOperationAction(ISD::FCOS, MVT::f64, Expand);
263 setOperationAction(ISD::FREM, MVT::f64, Expand);
264 setOperationAction(ISD::FREM, MVT::f32, Expand);
265 if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb()) {
266 setOperationAction(ISD::FCOPYSIGN, MVT::f64, Custom);
267 setOperationAction(ISD::FCOPYSIGN, MVT::f32, Custom);
269 setOperationAction(ISD::FPOW, MVT::f64, Expand);
270 setOperationAction(ISD::FPOW, MVT::f32, Expand);
272 // int <-> fp are custom expanded into bit_convert + ARMISD ops.
273 if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb()) {
274 setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom);
275 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Custom);
276 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Custom);
277 setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom);
280 // We have target-specific dag combine patterns for the following nodes:
281 // ARMISD::FMRRD - No need to call setTargetDAGCombine
282 setTargetDAGCombine(ISD::ADD);
283 setTargetDAGCombine(ISD::SUB);
285 setStackPointerRegisterToSaveRestore(ARM::SP);
286 setSchedulingPreference(SchedulingForRegPressure);
287 setIfCvtBlockSizeLimit(Subtarget->isThumb() ? 0 : 10);
288 setIfCvtDupBlockSizeLimit(Subtarget->isThumb() ? 0 : 2);
290 maxStoresPerMemcpy = 1; //// temporary - rewrite interface to use type
293 const char *ARMTargetLowering::getTargetNodeName(unsigned Opcode) const {
296 case ARMISD::Wrapper: return "ARMISD::Wrapper";
297 case ARMISD::WrapperJT: return "ARMISD::WrapperJT";
298 case ARMISD::CALL: return "ARMISD::CALL";
299 case ARMISD::CALL_PRED: return "ARMISD::CALL_PRED";
300 case ARMISD::CALL_NOLINK: return "ARMISD::CALL_NOLINK";
301 case ARMISD::tCALL: return "ARMISD::tCALL";
302 case ARMISD::BRCOND: return "ARMISD::BRCOND";
303 case ARMISD::BR_JT: return "ARMISD::BR_JT";
304 case ARMISD::RET_FLAG: return "ARMISD::RET_FLAG";
305 case ARMISD::PIC_ADD: return "ARMISD::PIC_ADD";
306 case ARMISD::CMP: return "ARMISD::CMP";
307 case ARMISD::CMPNZ: return "ARMISD::CMPNZ";
308 case ARMISD::CMPFP: return "ARMISD::CMPFP";
309 case ARMISD::CMPFPw0: return "ARMISD::CMPFPw0";
310 case ARMISD::FMSTAT: return "ARMISD::FMSTAT";
311 case ARMISD::CMOV: return "ARMISD::CMOV";
312 case ARMISD::CNEG: return "ARMISD::CNEG";
314 case ARMISD::FTOSI: return "ARMISD::FTOSI";
315 case ARMISD::FTOUI: return "ARMISD::FTOUI";
316 case ARMISD::SITOF: return "ARMISD::SITOF";
317 case ARMISD::UITOF: return "ARMISD::UITOF";
319 case ARMISD::SRL_FLAG: return "ARMISD::SRL_FLAG";
320 case ARMISD::SRA_FLAG: return "ARMISD::SRA_FLAG";
321 case ARMISD::RRX: return "ARMISD::RRX";
323 case ARMISD::FMRRD: return "ARMISD::FMRRD";
324 case ARMISD::FMDRR: return "ARMISD::FMDRR";
326 case ARMISD::THREAD_POINTER:return "ARMISD::THREAD_POINTER";
330 //===----------------------------------------------------------------------===//
332 //===----------------------------------------------------------------------===//
334 /// IntCCToARMCC - Convert a DAG integer condition code to an ARM CC
335 static ARMCC::CondCodes IntCCToARMCC(ISD::CondCode CC) {
337 default: assert(0 && "Unknown condition code!");
338 case ISD::SETNE: return ARMCC::NE;
339 case ISD::SETEQ: return ARMCC::EQ;
340 case ISD::SETGT: return ARMCC::GT;
341 case ISD::SETGE: return ARMCC::GE;
342 case ISD::SETLT: return ARMCC::LT;
343 case ISD::SETLE: return ARMCC::LE;
344 case ISD::SETUGT: return ARMCC::HI;
345 case ISD::SETUGE: return ARMCC::HS;
346 case ISD::SETULT: return ARMCC::LO;
347 case ISD::SETULE: return ARMCC::LS;
351 /// FPCCToARMCC - Convert a DAG fp condition code to an ARM CC. It
352 /// returns true if the operands should be inverted to form the proper
354 static bool FPCCToARMCC(ISD::CondCode CC, ARMCC::CondCodes &CondCode,
355 ARMCC::CondCodes &CondCode2) {
357 CondCode2 = ARMCC::AL;
359 default: assert(0 && "Unknown FP condition!");
361 case ISD::SETOEQ: CondCode = ARMCC::EQ; break;
363 case ISD::SETOGT: CondCode = ARMCC::GT; break;
365 case ISD::SETOGE: CondCode = ARMCC::GE; break;
366 case ISD::SETOLT: CondCode = ARMCC::MI; break;
367 case ISD::SETOLE: CondCode = ARMCC::GT; Invert = true; break;
368 case ISD::SETONE: CondCode = ARMCC::MI; CondCode2 = ARMCC::GT; break;
369 case ISD::SETO: CondCode = ARMCC::VC; break;
370 case ISD::SETUO: CondCode = ARMCC::VS; break;
371 case ISD::SETUEQ: CondCode = ARMCC::EQ; CondCode2 = ARMCC::VS; break;
372 case ISD::SETUGT: CondCode = ARMCC::HI; break;
373 case ISD::SETUGE: CondCode = ARMCC::PL; break;
375 case ISD::SETULT: CondCode = ARMCC::LT; break;
377 case ISD::SETULE: CondCode = ARMCC::LE; break;
379 case ISD::SETUNE: CondCode = ARMCC::NE; break;
384 //===----------------------------------------------------------------------===//
385 // Calling Convention Implementation
387 // The lower operations present on calling convention works on this order:
388 // LowerCALL (virt regs --> phys regs, virt regs --> stack)
389 // LowerFORMAL_ARGUMENTS (phys --> virt regs, stack --> virt regs)
390 // LowerRET (virt regs --> phys regs)
391 // LowerCALL (phys regs --> virt regs)
393 //===----------------------------------------------------------------------===//
395 #include "ARMGenCallingConv.inc"
397 // APCS f64 is in register pairs, possibly split to stack
398 static bool CC_ARM_APCS_Custom_f64(unsigned &ValNo, MVT &ValVT, MVT &LocVT,
399 CCValAssign::LocInfo &LocInfo,
400 ISD::ArgFlagsTy &ArgFlags,
402 static const unsigned HiRegList[] = { ARM::R0, ARM::R1, ARM::R2, ARM::R3 };
403 static const unsigned LoRegList[] = { ARM::R1,
408 if (unsigned Reg = State.AllocateReg(HiRegList, LoRegList, 4)) {
410 for (i = 0; i < 4; ++i)
411 if (HiRegList[i] == Reg)
414 State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, Reg,
416 if (LoRegList[i] != ARM::NoRegister)
417 State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, LoRegList[i],
420 State.addLoc(CCValAssign::getCustomMem(ValNo, ValVT,
421 State.AllocateStack(4, 4),
423 return true; // we handled it
426 return false; // we didn't handle it
429 // AAPCS f64 is in aligned register pairs
430 static bool CC_ARM_AAPCS_Custom_f64(unsigned &ValNo, MVT &ValVT, MVT &LocVT,
431 CCValAssign::LocInfo &LocInfo,
432 ISD::ArgFlagsTy &ArgFlags,
434 static const unsigned HiRegList[] = { ARM::R0, ARM::R2 };
435 static const unsigned LoRegList[] = { ARM::R1, ARM::R3 };
437 if (unsigned Reg = State.AllocateReg(HiRegList, LoRegList, 2)) {
439 for (i = 0; i < 2; ++i)
440 if (HiRegList[i] == Reg)
443 State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, Reg,
445 State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, LoRegList[i],
447 return true; // we handled it
450 return false; // we didn't handle it
453 static bool RetCC_ARM_APCS_Custom_f64(unsigned &ValNo, MVT &ValVT, MVT &LocVT,
454 CCValAssign::LocInfo &LocInfo,
455 ISD::ArgFlagsTy &ArgFlags,
457 static const unsigned HiRegList[] = { ARM::R0, ARM::R2 };
458 static const unsigned LoRegList[] = { ARM::R1, ARM::R3 };
460 if (unsigned Reg = State.AllocateReg(HiRegList, LoRegList, 2)) {
462 for (i = 0; i < 2; ++i)
463 if (HiRegList[i] == Reg)
466 State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, Reg,
468 State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, LoRegList[i],
470 return true; // we handled it
473 return false; // we didn't handle it
476 static bool RetCC_ARM_AAPCS_Custom_f64(unsigned &ValNo, MVT &ValVT, MVT &LocVT,
477 CCValAssign::LocInfo &LocInfo,
478 ISD::ArgFlagsTy &ArgFlags,
480 return RetCC_ARM_APCS_Custom_f64(ValNo, ValVT, LocVT, LocInfo, ArgFlags,
484 /// AddLiveIn - This helper function adds the specified physical register to the
485 /// MachineFunction as a live in value. It also creates a corresponding virtual
487 static unsigned AddLiveIn(MachineFunction &MF, unsigned PReg,
488 const TargetRegisterClass *RC) {
489 assert(RC->contains(PReg) && "Not the correct regclass!");
490 unsigned VReg = MF.getRegInfo().createVirtualRegister(RC);
491 MF.getRegInfo().addLiveIn(PReg, VReg);
495 /// LowerCallResult - Lower the result values of an ISD::CALL into the
496 /// appropriate copies out of appropriate physical registers. This assumes that
497 /// Chain/InFlag are the input chain/flag to use, and that TheCall is the call
498 /// being lowered. The returns a SDNode with the same number of values as the
500 SDNode *ARMTargetLowering::
501 LowerCallResult(SDValue Chain, SDValue InFlag, CallSDNode *TheCall,
502 unsigned CallingConv, SelectionDAG &DAG) {
504 DebugLoc dl = TheCall->getDebugLoc();
505 // Assign locations to each value returned by this call.
506 SmallVector<CCValAssign, 16> RVLocs;
507 bool isVarArg = TheCall->isVarArg();
508 CCState CCInfo(CallingConv, isVarArg, getTargetMachine(), RVLocs);
509 CCInfo.AnalyzeCallResult(TheCall, RetCC_ARM);
511 SmallVector<SDValue, 8> ResultVals;
513 // Copy all of the result registers out of their specified physreg.
514 for (unsigned i = 0; i != RVLocs.size(); ++i) {
515 CCValAssign VA = RVLocs[i];
517 // handle f64 as custom
518 if (VA.needsCustom()) {
519 SDValue Lo = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(), VA.getLocVT(),
521 VA = RVLocs[++i]; // skip ahead to next loc
522 SDValue Hi = DAG.getCopyFromReg(Lo, dl, VA.getLocReg(), VA.getLocVT(),
524 ResultVals.push_back(DAG.getNode(ARMISD::FMDRR, dl, VA.getValVT(), Lo,
527 Chain = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(), VA.getLocVT(),
529 SDValue Val = Chain.getValue(0);
530 InFlag = Chain.getValue(2);
532 switch (VA.getLocInfo()) {
533 default: assert(0 && "Unknown loc info!");
534 case CCValAssign::Full: break;
535 case CCValAssign::BCvt:
536 Val = DAG.getNode(ISD::BIT_CONVERT, dl, VA.getValVT(),
541 ResultVals.push_back(Val);
545 // Merge everything together with a MERGE_VALUES node.
546 ResultVals.push_back(Chain);
547 return DAG.getNode(ISD::MERGE_VALUES, dl, TheCall->getVTList(),
548 &ResultVals[0], ResultVals.size()).getNode();
551 /// CreateCopyOfByValArgument - Make a copy of an aggregate at address specified
552 /// by "Src" to address "Dst" of size "Size". Alignment information is
553 /// specified by the specific parameter attribute. The copy will be passed as
554 /// a byval function parameter.
555 /// Sometimes what we are copying is the end of a larger object, the part that
556 /// does not fit in registers.
558 CreateCopyOfByValArgument(SDValue Src, SDValue Dst, SDValue Chain,
559 ISD::ArgFlagsTy Flags, SelectionDAG &DAG,
561 SDValue SizeNode = DAG.getConstant(Flags.getByValSize(), MVT::i32);
562 return DAG.getMemcpy(Chain, dl, Dst, Src, SizeNode, Flags.getByValAlign(),
563 /*AlwaysInline=*/false, NULL, 0, NULL, 0);
566 /// LowerMemOpCallTo - Store the argument to the stack.
568 ARMTargetLowering::LowerMemOpCallTo(CallSDNode *TheCall, SelectionDAG &DAG,
569 const SDValue &StackPtr,
570 const CCValAssign &VA, SDValue Chain,
571 SDValue Arg, ISD::ArgFlagsTy Flags) {
572 DebugLoc dl = TheCall->getDebugLoc();
573 unsigned LocMemOffset = VA.getLocMemOffset();
574 SDValue PtrOff = DAG.getIntPtrConstant(LocMemOffset);
575 PtrOff = DAG.getNode(ISD::ADD, dl, getPointerTy(), StackPtr, PtrOff);
576 if (Flags.isByVal()) {
577 return CreateCopyOfByValArgument(Arg, PtrOff, Chain, Flags, DAG, dl);
579 return DAG.getStore(Chain, dl, Arg, PtrOff,
580 PseudoSourceValue::getStack(), LocMemOffset);
583 /// LowerCALL - Lowering a ISD::CALL node into a callseq_start <-
584 /// ARMISD:CALL <- callseq_end chain. Also add input and output parameter
586 SDValue ARMTargetLowering::LowerCALL(SDValue Op, SelectionDAG &DAG) {
587 CallSDNode *TheCall = cast<CallSDNode>(Op.getNode());
588 MVT RetVT = TheCall->getRetValType(0);
589 SDValue Chain = TheCall->getChain();
590 unsigned CC = TheCall->getCallingConv();
591 assert((CC == CallingConv::C ||
592 CC == CallingConv::Fast) && "unknown calling convention");
593 bool isVarArg = TheCall->isVarArg();
594 SDValue Callee = TheCall->getCallee();
595 DebugLoc dl = TheCall->getDebugLoc();
597 // Analyze operands of the call, assigning locations to each operand.
598 SmallVector<CCValAssign, 16> ArgLocs;
599 CCState CCInfo(CC, isVarArg, getTargetMachine(), ArgLocs);
600 CCInfo.AnalyzeCallOperands(TheCall, CC_ARM);
602 // Get a count of how many bytes are to be pushed on the stack.
603 unsigned NumBytes = CCInfo.getNextStackOffset();
605 // Adjust the stack pointer for the new arguments...
606 // These operations are automatically eliminated by the prolog/epilog pass
607 Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(NumBytes, true));
609 SDValue StackPtr = DAG.getRegister(ARM::SP, MVT::i32);
611 SmallVector<std::pair<unsigned, SDValue>, 8> RegsToPass;
612 SmallVector<SDValue, 8> MemOpChains;
614 // Walk the register/memloc assignments, inserting copies/loads. In the case
615 // of tail call optimization, arguments are handled later.
616 for (unsigned i = 0, realArgIdx = 0, e = ArgLocs.size();
619 CCValAssign &VA = ArgLocs[i];
620 SDValue Arg = TheCall->getArg(realArgIdx);
621 ISD::ArgFlagsTy Flags = TheCall->getArgFlags(realArgIdx);
623 // Promote the value if needed.
624 switch (VA.getLocInfo()) {
625 default: assert(0 && "Unknown loc info!");
626 case CCValAssign::Full: break;
627 case CCValAssign::SExt:
628 Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg);
630 case CCValAssign::ZExt:
631 Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), Arg);
633 case CCValAssign::AExt:
634 Arg = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), Arg);
636 case CCValAssign::BCvt:
637 Arg = DAG.getNode(ISD::BIT_CONVERT, dl, VA.getLocVT(), Arg);
641 // f64 is passed in i32 pairs and must be combined
642 if (VA.needsCustom()) {
643 SDValue fmrrd = DAG.getNode(ARMISD::FMRRD, dl,
644 DAG.getVTList(MVT::i32, MVT::i32), &Arg, 1);
645 RegsToPass.push_back(std::make_pair(VA.getLocReg(), fmrrd));
646 VA = ArgLocs[++i]; // skip ahead to next loc
648 RegsToPass.push_back(std::make_pair(VA.getLocReg(), fmrrd.getValue(1)));
650 assert(VA.isMemLoc());
651 if (StackPtr.getNode() == 0)
652 StackPtr = DAG.getCopyFromReg(Chain, dl, ARM::SP, getPointerTy());
654 MemOpChains.push_back(LowerMemOpCallTo(TheCall, DAG, StackPtr, VA,
655 Chain, fmrrd.getValue(1),
658 } else if (VA.isRegLoc()) {
659 RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
661 assert(VA.isMemLoc());
662 if (StackPtr.getNode() == 0)
663 StackPtr = DAG.getCopyFromReg(Chain, dl, ARM::SP, getPointerTy());
665 MemOpChains.push_back(LowerMemOpCallTo(TheCall, DAG, StackPtr, VA,
670 if (!MemOpChains.empty())
671 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
672 &MemOpChains[0], MemOpChains.size());
674 // Build a sequence of copy-to-reg nodes chained together with token chain
675 // and flag operands which copy the outgoing args into the appropriate regs.
677 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
678 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
679 RegsToPass[i].second, InFlag);
680 InFlag = Chain.getValue(1);
683 // If the callee is a GlobalAddress/ExternalSymbol node (quite common, every
684 // direct call is) turn it into a TargetGlobalAddress/TargetExternalSymbol
685 // node so that legalize doesn't hack it.
686 bool isDirect = false;
687 bool isARMFunc = false;
688 bool isLocalARMFunc = false;
689 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
690 GlobalValue *GV = G->getGlobal();
692 bool isExt = (GV->isDeclaration() || GV->hasWeakLinkage() ||
693 GV->hasLinkOnceLinkage());
694 bool isStub = (isExt && Subtarget->isTargetDarwin()) &&
695 getTargetMachine().getRelocationModel() != Reloc::Static;
696 isARMFunc = !Subtarget->isThumb() || isStub;
697 // ARM call to a local ARM function is predicable.
698 isLocalARMFunc = !Subtarget->isThumb() && !isExt;
699 // tBX takes a register source operand.
700 if (isARMFunc && Subtarget->isThumb() && !Subtarget->hasV5TOps()) {
701 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(GV, ARMPCLabelIndex,
703 SDValue CPAddr = DAG.getTargetConstantPool(CPV, getPointerTy(), 4);
704 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
705 Callee = DAG.getLoad(getPointerTy(), dl,
706 DAG.getEntryNode(), CPAddr, NULL, 0);
707 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
708 Callee = DAG.getNode(ARMISD::PIC_ADD, dl,
709 getPointerTy(), Callee, PICLabel);
711 Callee = DAG.getTargetGlobalAddress(GV, getPointerTy());
712 } else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee)) {
714 bool isStub = Subtarget->isTargetDarwin() &&
715 getTargetMachine().getRelocationModel() != Reloc::Static;
716 isARMFunc = !Subtarget->isThumb() || isStub;
717 // tBX takes a register source operand.
718 const char *Sym = S->getSymbol();
719 if (isARMFunc && Subtarget->isThumb() && !Subtarget->hasV5TOps()) {
720 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(Sym, ARMPCLabelIndex,
722 SDValue CPAddr = DAG.getTargetConstantPool(CPV, getPointerTy(), 4);
723 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
724 Callee = DAG.getLoad(getPointerTy(), dl,
725 DAG.getEntryNode(), CPAddr, NULL, 0);
726 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
727 Callee = DAG.getNode(ARMISD::PIC_ADD, dl,
728 getPointerTy(), Callee, PICLabel);
730 Callee = DAG.getTargetExternalSymbol(Sym, getPointerTy());
733 // FIXME: handle tail calls differently.
735 if (Subtarget->isThumb()) {
736 if (!Subtarget->hasV5TOps() && (!isDirect || isARMFunc))
737 CallOpc = ARMISD::CALL_NOLINK;
739 CallOpc = isARMFunc ? ARMISD::CALL : ARMISD::tCALL;
741 CallOpc = (isDirect || Subtarget->hasV5TOps())
742 ? (isLocalARMFunc ? ARMISD::CALL_PRED : ARMISD::CALL)
743 : ARMISD::CALL_NOLINK;
745 if (CallOpc == ARMISD::CALL_NOLINK && !Subtarget->isThumb()) {
746 // implicit def LR - LR mustn't be allocated as GRP:$dst of CALL_NOLINK
747 Chain = DAG.getCopyToReg(Chain, dl, ARM::LR, DAG.getUNDEF(MVT::i32),InFlag);
748 InFlag = Chain.getValue(1);
751 std::vector<SDValue> Ops;
752 Ops.push_back(Chain);
753 Ops.push_back(Callee);
755 // Add argument registers to the end of the list so that they are known live
757 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
758 Ops.push_back(DAG.getRegister(RegsToPass[i].first,
759 RegsToPass[i].second.getValueType()));
761 if (InFlag.getNode())
762 Ops.push_back(InFlag);
763 // Returns a chain and a flag for retval copy to use.
764 Chain = DAG.getNode(CallOpc, dl, DAG.getVTList(MVT::Other, MVT::Flag),
765 &Ops[0], Ops.size());
766 InFlag = Chain.getValue(1);
768 Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(NumBytes, true),
769 DAG.getIntPtrConstant(0, true), InFlag);
770 if (RetVT != MVT::Other)
771 InFlag = Chain.getValue(1);
773 // Handle result values, copying them out of physregs into vregs that we
775 return SDValue(LowerCallResult(Chain, InFlag, TheCall, CC, DAG),
779 SDValue ARMTargetLowering::LowerRET(SDValue Op, SelectionDAG &DAG) {
780 // The chain is always operand #0
781 SDValue Chain = Op.getOperand(0);
782 DebugLoc dl = Op.getDebugLoc();
784 // CCValAssign - represent the assignment of the return value to a location.
785 SmallVector<CCValAssign, 16> RVLocs;
786 unsigned CC = DAG.getMachineFunction().getFunction()->getCallingConv();
787 bool isVarArg = DAG.getMachineFunction().getFunction()->isVarArg();
789 // CCState - Info about the registers and stack slots.
790 CCState CCInfo(CC, isVarArg, getTargetMachine(), RVLocs);
792 // Analyze return values of ISD::RET.
793 CCInfo.AnalyzeReturn(Op.getNode(), RetCC_ARM);
795 // If this is the first return lowered for this function, add
796 // the regs to the liveout set for the function.
797 if (DAG.getMachineFunction().getRegInfo().liveout_empty()) {
798 for (unsigned i = 0; i != RVLocs.size(); ++i)
799 if (RVLocs[i].isRegLoc())
800 DAG.getMachineFunction().getRegInfo().addLiveOut(RVLocs[i].getLocReg());
805 // Copy the result values into the output registers.
806 for (unsigned i = 0, realRVLocIdx = 0;
808 ++i, ++realRVLocIdx) {
809 CCValAssign &VA = RVLocs[i];
810 assert(VA.isRegLoc() && "Can only return in registers!");
812 // ISD::RET => ret chain, (regnum1,val1), ...
813 // So i*2+1 index only the regnums
814 SDValue Arg = Op.getOperand(realRVLocIdx*2+1);
816 switch (VA.getLocInfo()) {
817 default: assert(0 && "Unknown loc info!");
818 case CCValAssign::Full: break;
819 case CCValAssign::BCvt:
820 Arg = DAG.getNode(ISD::BIT_CONVERT, dl, VA.getLocVT(), Arg);
824 // Legalize ret f64 -> ret 2 x i32. We always have fmrrd if f64 is
826 if (VA.needsCustom()) {
827 SDValue fmrrd = DAG.getNode(ARMISD::FMRRD, dl,
828 DAG.getVTList(MVT::i32, MVT::i32), &Arg, 1);
829 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), fmrrd, Flag);
830 VA = RVLocs[++i]; // skip ahead to next loc
831 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), fmrrd.getValue(1),
834 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), Arg, Flag);
836 // Guarantee that all emitted copies are
837 // stuck together, avoiding something bad.
838 Flag = Chain.getValue(1);
843 result = DAG.getNode(ARMISD::RET_FLAG, dl, MVT::Other, Chain, Flag);
845 result = DAG.getNode(ARMISD::RET_FLAG, dl, MVT::Other, Chain);
850 // ConstantPool, JumpTable, GlobalAddress, and ExternalSymbol are lowered as
851 // their target countpart wrapped in the ARMISD::Wrapper node. Suppose N is
852 // one of the above mentioned nodes. It has to be wrapped because otherwise
853 // Select(N) returns N. So the raw TargetGlobalAddress nodes, etc. can only
854 // be used to form addressing mode. These wrapped nodes will be selected
856 static SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) {
857 MVT PtrVT = Op.getValueType();
858 // FIXME there is no actual debug info here
859 DebugLoc dl = Op.getDebugLoc();
860 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
862 if (CP->isMachineConstantPoolEntry())
863 Res = DAG.getTargetConstantPool(CP->getMachineCPVal(), PtrVT,
866 Res = DAG.getTargetConstantPool(CP->getConstVal(), PtrVT,
868 return DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, Res);
871 // Lower ISD::GlobalTLSAddress using the "general dynamic" model
873 ARMTargetLowering::LowerToTLSGeneralDynamicModel(GlobalAddressSDNode *GA,
875 DebugLoc dl = GA->getDebugLoc();
876 MVT PtrVT = getPointerTy();
877 unsigned char PCAdj = Subtarget->isThumb() ? 4 : 8;
878 ARMConstantPoolValue *CPV =
879 new ARMConstantPoolValue(GA->getGlobal(), ARMPCLabelIndex, ARMCP::CPValue,
880 PCAdj, "tlsgd", true);
881 SDValue Argument = DAG.getTargetConstantPool(CPV, PtrVT, 4);
882 Argument = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, Argument);
883 Argument = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), Argument, NULL, 0);
884 SDValue Chain = Argument.getValue(1);
886 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
887 Argument = DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Argument, PICLabel);
889 // call __tls_get_addr.
892 Entry.Node = Argument;
893 Entry.Ty = (const Type *) Type::Int32Ty;
894 Args.push_back(Entry);
895 // FIXME: is there useful debug info available here?
896 std::pair<SDValue, SDValue> CallResult =
897 LowerCallTo(Chain, (const Type *) Type::Int32Ty, false, false, false, false,
898 CallingConv::C, false,
899 DAG.getExternalSymbol("__tls_get_addr", PtrVT), Args, DAG, dl);
900 return CallResult.first;
903 // Lower ISD::GlobalTLSAddress using the "initial exec" or
904 // "local exec" model.
906 ARMTargetLowering::LowerToTLSExecModels(GlobalAddressSDNode *GA,
908 GlobalValue *GV = GA->getGlobal();
909 DebugLoc dl = GA->getDebugLoc();
911 SDValue Chain = DAG.getEntryNode();
912 MVT PtrVT = getPointerTy();
913 // Get the Thread Pointer
914 SDValue ThreadPointer = DAG.getNode(ARMISD::THREAD_POINTER, dl, PtrVT);
916 if (GV->isDeclaration()){
917 // initial exec model
918 unsigned char PCAdj = Subtarget->isThumb() ? 4 : 8;
919 ARMConstantPoolValue *CPV =
920 new ARMConstantPoolValue(GA->getGlobal(), ARMPCLabelIndex, ARMCP::CPValue,
921 PCAdj, "gottpoff", true);
922 Offset = DAG.getTargetConstantPool(CPV, PtrVT, 4);
923 Offset = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, Offset);
924 Offset = DAG.getLoad(PtrVT, dl, Chain, Offset, NULL, 0);
925 Chain = Offset.getValue(1);
927 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
928 Offset = DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Offset, PICLabel);
930 Offset = DAG.getLoad(PtrVT, dl, Chain, Offset, NULL, 0);
933 ARMConstantPoolValue *CPV =
934 new ARMConstantPoolValue(GV, ARMCP::CPValue, "tpoff");
935 Offset = DAG.getTargetConstantPool(CPV, PtrVT, 4);
936 Offset = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, Offset);
937 Offset = DAG.getLoad(PtrVT, dl, Chain, Offset, NULL, 0);
940 // The address of the thread local variable is the add of the thread
941 // pointer with the offset of the variable.
942 return DAG.getNode(ISD::ADD, dl, PtrVT, ThreadPointer, Offset);
946 ARMTargetLowering::LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) {
947 // TODO: implement the "local dynamic" model
948 assert(Subtarget->isTargetELF() &&
949 "TLS not implemented for non-ELF targets");
950 GlobalAddressSDNode *GA = cast<GlobalAddressSDNode>(Op);
951 // If the relocation model is PIC, use the "General Dynamic" TLS Model,
952 // otherwise use the "Local Exec" TLS Model
953 if (getTargetMachine().getRelocationModel() == Reloc::PIC_)
954 return LowerToTLSGeneralDynamicModel(GA, DAG);
956 return LowerToTLSExecModels(GA, DAG);
959 SDValue ARMTargetLowering::LowerGlobalAddressELF(SDValue Op,
961 MVT PtrVT = getPointerTy();
962 DebugLoc dl = Op.getDebugLoc();
963 GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
964 Reloc::Model RelocM = getTargetMachine().getRelocationModel();
965 if (RelocM == Reloc::PIC_) {
966 bool UseGOTOFF = GV->hasLocalLinkage() || GV->hasHiddenVisibility();
967 ARMConstantPoolValue *CPV =
968 new ARMConstantPoolValue(GV, ARMCP::CPValue, UseGOTOFF ? "GOTOFF":"GOT");
969 SDValue CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4);
970 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
971 SDValue Result = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(),
973 SDValue Chain = Result.getValue(1);
974 SDValue GOT = DAG.getGLOBAL_OFFSET_TABLE(PtrVT);
975 Result = DAG.getNode(ISD::ADD, dl, PtrVT, Result, GOT);
977 Result = DAG.getLoad(PtrVT, dl, Chain, Result, NULL, 0);
980 SDValue CPAddr = DAG.getTargetConstantPool(GV, PtrVT, 4);
981 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
982 return DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), CPAddr, NULL, 0);
986 /// GVIsIndirectSymbol - true if the GV will be accessed via an indirect symbol
987 /// even in non-static mode.
988 static bool GVIsIndirectSymbol(GlobalValue *GV, Reloc::Model RelocM) {
989 // If symbol visibility is hidden, the extra load is not needed if
990 // the symbol is definitely defined in the current translation unit.
991 bool isDecl = GV->isDeclaration() && !GV->hasNotBeenReadFromBitcode();
992 if (GV->hasHiddenVisibility() && (!isDecl && !GV->hasCommonLinkage()))
994 return RelocM != Reloc::Static && (isDecl || GV->isWeakForLinker());
997 SDValue ARMTargetLowering::LowerGlobalAddressDarwin(SDValue Op,
999 MVT PtrVT = getPointerTy();
1000 DebugLoc dl = Op.getDebugLoc();
1001 GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
1002 Reloc::Model RelocM = getTargetMachine().getRelocationModel();
1003 bool IsIndirect = GVIsIndirectSymbol(GV, RelocM);
1005 if (RelocM == Reloc::Static)
1006 CPAddr = DAG.getTargetConstantPool(GV, PtrVT, 4);
1008 unsigned PCAdj = (RelocM != Reloc::PIC_)
1009 ? 0 : (Subtarget->isThumb() ? 4 : 8);
1010 ARMCP::ARMCPKind Kind = IsIndirect ? ARMCP::CPNonLazyPtr
1012 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(GV, ARMPCLabelIndex,
1014 CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4);
1016 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1018 SDValue Result = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), CPAddr, NULL, 0);
1019 SDValue Chain = Result.getValue(1);
1021 if (RelocM == Reloc::PIC_) {
1022 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
1023 Result = DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Result, PICLabel);
1026 Result = DAG.getLoad(PtrVT, dl, Chain, Result, NULL, 0);
1031 SDValue ARMTargetLowering::LowerGLOBAL_OFFSET_TABLE(SDValue Op,
1033 assert(Subtarget->isTargetELF() &&
1034 "GLOBAL OFFSET TABLE not implemented for non-ELF targets");
1035 MVT PtrVT = getPointerTy();
1036 DebugLoc dl = Op.getDebugLoc();
1037 unsigned PCAdj = Subtarget->isThumb() ? 4 : 8;
1038 ARMConstantPoolValue *CPV = new ARMConstantPoolValue("_GLOBAL_OFFSET_TABLE_",
1040 ARMCP::CPValue, PCAdj);
1041 SDValue CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4);
1042 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1043 SDValue Result = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), CPAddr, NULL, 0);
1044 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
1045 return DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Result, PICLabel);
1048 static SDValue LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG) {
1049 MVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
1050 unsigned IntNo = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
1052 default: return SDValue(); // Don't custom lower most intrinsics.
1053 case Intrinsic::arm_thread_pointer:
1054 return DAG.getNode(ARMISD::THREAD_POINTER, DebugLoc::getUnknownLoc(),
1059 static SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG,
1060 unsigned VarArgsFrameIndex) {
1061 // vastart just stores the address of the VarArgsFrameIndex slot into the
1062 // memory location argument.
1063 DebugLoc dl = Op.getDebugLoc();
1064 MVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
1065 SDValue FR = DAG.getFrameIndex(VarArgsFrameIndex, PtrVT);
1066 const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
1067 return DAG.getStore(Op.getOperand(0), dl, FR, Op.getOperand(1), SV, 0);
1071 ARMTargetLowering::LowerFORMAL_ARGUMENTS(SDValue Op, SelectionDAG &DAG) {
1072 MachineFunction &MF = DAG.getMachineFunction();
1073 MachineFrameInfo *MFI = MF.getFrameInfo();
1075 SDValue Root = Op.getOperand(0);
1076 DebugLoc dl = Op.getDebugLoc();
1077 bool isVarArg = cast<ConstantSDNode>(Op.getOperand(2))->getZExtValue() != 0;
1078 unsigned CC = MF.getFunction()->getCallingConv();
1079 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1081 // Assign locations to all of the incoming arguments.
1082 SmallVector<CCValAssign, 16> ArgLocs;
1083 CCState CCInfo(CC, isVarArg, getTargetMachine(), ArgLocs);
1084 CCInfo.AnalyzeFormalArguments(Op.getNode(), CC_ARM);
1086 SmallVector<SDValue, 16> ArgValues;
1088 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
1089 CCValAssign &VA = ArgLocs[i];
1091 // Arguments stored in registers.
1092 if (VA.isRegLoc()) {
1093 MVT RegVT = VA.getLocVT();
1094 TargetRegisterClass *RC;
1095 if (AFI->isThumbFunction())
1096 RC = ARM::tGPRRegisterClass;
1098 RC = ARM::GPRRegisterClass;
1100 if (RegVT == MVT::f64) {
1101 // f64 is passed in pairs of GPRs and must be combined.
1103 } else if (!((RegVT == MVT::i32) || (RegVT == MVT::f32)))
1104 assert(0 && "RegVT not supported by FORMAL_ARGUMENTS Lowering");
1106 // Transform the arguments stored in physical registers into virtual ones.
1107 unsigned Reg = AddLiveIn(MF, VA.getLocReg(), RC);
1108 SDValue ArgValue = DAG.getCopyFromReg(Root, dl, Reg, RegVT);
1110 // f64 is passed in i32 pairs and must be combined.
1111 if (VA.needsCustom()) {
1114 VA = ArgLocs[++i]; // skip ahead to next loc
1115 if (VA.isMemLoc()) {
1116 // must be APCS and older than V5T to split like this
1117 unsigned ArgSize = VA.getLocVT().getSizeInBits()/8;
1118 int FI = MFI->CreateFixedObject(ArgSize, VA.getLocMemOffset());
1120 // Create load node to retrieve arguments from the stack.
1121 SDValue FIN = DAG.getFrameIndex(FI, getPointerTy());
1122 ArgValue2 = DAG.getLoad(MVT::i32, dl, Root, FIN, NULL, 0);
1124 Reg = AddLiveIn(MF, VA.getLocReg(), RC);
1125 ArgValue2 = DAG.getCopyFromReg(Root, dl, Reg, MVT::i32);
1128 ArgValue = DAG.getNode(ARMISD::FMDRR, dl, MVT::f64,
1129 ArgValue, ArgValue2);
1132 // If this is an 8 or 16-bit value, it is really passed promoted
1133 // to 32 bits. Insert an assert[sz]ext to capture this, then
1134 // truncate to the right size.
1135 switch (VA.getLocInfo()) {
1136 default: assert(0 && "Unknown loc info!");
1137 case CCValAssign::Full: break;
1138 case CCValAssign::BCvt:
1139 ArgValue = DAG.getNode(ISD::BIT_CONVERT, dl, VA.getValVT(), ArgValue);
1141 case CCValAssign::SExt:
1142 ArgValue = DAG.getNode(ISD::AssertSext, dl, RegVT, ArgValue,
1143 DAG.getValueType(VA.getValVT()));
1144 ArgValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), ArgValue);
1146 case CCValAssign::ZExt:
1147 ArgValue = DAG.getNode(ISD::AssertZext, dl, RegVT, ArgValue,
1148 DAG.getValueType(VA.getValVT()));
1149 ArgValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), ArgValue);
1153 ArgValues.push_back(ArgValue);
1155 } else { // VA.isRegLoc()
1158 assert(VA.isMemLoc());
1159 assert(VA.getValVT() != MVT::i64 && "i64 should already be lowered");
1161 unsigned ArgSize = VA.getLocVT().getSizeInBits()/8;
1162 int FI = MFI->CreateFixedObject(ArgSize, VA.getLocMemOffset());
1164 // Create load nodes to retrieve arguments from the stack.
1165 SDValue FIN = DAG.getFrameIndex(FI, getPointerTy());
1166 ArgValues.push_back(DAG.getLoad(VA.getValVT(), dl, Root, FIN, NULL, 0));
1172 static const unsigned GPRArgRegs[] = {
1173 ARM::R0, ARM::R1, ARM::R2, ARM::R3
1176 unsigned NumGPRs = CCInfo.getFirstUnallocated
1177 (GPRArgRegs, sizeof(GPRArgRegs) / sizeof(GPRArgRegs[0]));
1179 unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
1180 unsigned VARegSize = (4 - NumGPRs) * 4;
1181 unsigned VARegSaveSize = (VARegSize + Align - 1) & ~(Align - 1);
1182 unsigned ArgOffset = 0;
1183 if (VARegSaveSize) {
1184 // If this function is vararg, store any remaining integer argument regs
1185 // to their spots on the stack so that they may be loaded by deferencing
1186 // the result of va_next.
1187 AFI->setVarArgsRegSaveSize(VARegSaveSize);
1188 ArgOffset = CCInfo.getNextStackOffset();
1189 VarArgsFrameIndex = MFI->CreateFixedObject(VARegSaveSize, ArgOffset +
1190 VARegSaveSize - VARegSize);
1191 SDValue FIN = DAG.getFrameIndex(VarArgsFrameIndex, getPointerTy());
1193 SmallVector<SDValue, 4> MemOps;
1194 for (; NumGPRs < 4; ++NumGPRs) {
1195 TargetRegisterClass *RC;
1196 if (AFI->isThumbFunction())
1197 RC = ARM::tGPRRegisterClass;
1199 RC = ARM::GPRRegisterClass;
1201 unsigned VReg = AddLiveIn(MF, GPRArgRegs[NumGPRs], RC);
1202 SDValue Val = DAG.getCopyFromReg(Root, dl, VReg, MVT::i32);
1203 SDValue Store = DAG.getStore(Val.getValue(1), dl, Val, FIN, NULL, 0);
1204 MemOps.push_back(Store);
1205 FIN = DAG.getNode(ISD::ADD, dl, getPointerTy(), FIN,
1206 DAG.getConstant(4, getPointerTy()));
1208 if (!MemOps.empty())
1209 Root = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
1210 &MemOps[0], MemOps.size());
1212 // This will point to the next argument passed via stack.
1213 VarArgsFrameIndex = MFI->CreateFixedObject(4, ArgOffset);
1216 ArgValues.push_back(Root);
1218 // Return the new list of results.
1219 return DAG.getNode(ISD::MERGE_VALUES, dl, Op.getNode()->getVTList(),
1220 &ArgValues[0], ArgValues.size()).getValue(Op.getResNo());
1223 /// isFloatingPointZero - Return true if this is +0.0.
1224 static bool isFloatingPointZero(SDValue Op) {
1225 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(Op))
1226 return CFP->getValueAPF().isPosZero();
1227 else if (ISD::isEXTLoad(Op.getNode()) || ISD::isNON_EXTLoad(Op.getNode())) {
1228 // Maybe this has already been legalized into the constant pool?
1229 if (Op.getOperand(1).getOpcode() == ARMISD::Wrapper) {
1230 SDValue WrapperOp = Op.getOperand(1).getOperand(0);
1231 if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(WrapperOp))
1232 if (ConstantFP *CFP = dyn_cast<ConstantFP>(CP->getConstVal()))
1233 return CFP->getValueAPF().isPosZero();
1239 static bool isLegalCmpImmediate(unsigned C, bool isThumb) {
1240 return ( isThumb && (C & ~255U) == 0) ||
1241 (!isThumb && ARM_AM::getSOImmVal(C) != -1);
1244 /// Returns appropriate ARM CMP (cmp) and corresponding condition code for
1245 /// the given operands.
1246 static SDValue getARMCmp(SDValue LHS, SDValue RHS, ISD::CondCode CC,
1247 SDValue &ARMCC, SelectionDAG &DAG, bool isThumb,
1249 if (ConstantSDNode *RHSC = dyn_cast<ConstantSDNode>(RHS.getNode())) {
1250 unsigned C = RHSC->getZExtValue();
1251 if (!isLegalCmpImmediate(C, isThumb)) {
1252 // Constant does not fit, try adjusting it by one?
1257 if (isLegalCmpImmediate(C-1, isThumb)) {
1258 CC = (CC == ISD::SETLT) ? ISD::SETLE : ISD::SETGT;
1259 RHS = DAG.getConstant(C-1, MVT::i32);
1264 if (C > 0 && isLegalCmpImmediate(C-1, isThumb)) {
1265 CC = (CC == ISD::SETULT) ? ISD::SETULE : ISD::SETUGT;
1266 RHS = DAG.getConstant(C-1, MVT::i32);
1271 if (isLegalCmpImmediate(C+1, isThumb)) {
1272 CC = (CC == ISD::SETLE) ? ISD::SETLT : ISD::SETGE;
1273 RHS = DAG.getConstant(C+1, MVT::i32);
1278 if (C < 0xffffffff && isLegalCmpImmediate(C+1, isThumb)) {
1279 CC = (CC == ISD::SETULE) ? ISD::SETULT : ISD::SETUGE;
1280 RHS = DAG.getConstant(C+1, MVT::i32);
1287 ARMCC::CondCodes CondCode = IntCCToARMCC(CC);
1288 ARMISD::NodeType CompareType;
1291 CompareType = ARMISD::CMP;
1297 // Uses only N and Z Flags
1298 CompareType = ARMISD::CMPNZ;
1301 ARMCC = DAG.getConstant(CondCode, MVT::i32);
1302 return DAG.getNode(CompareType, dl, MVT::Flag, LHS, RHS);
1305 /// Returns a appropriate VFP CMP (fcmp{s|d}+fmstat) for the given operands.
1306 static SDValue getVFPCmp(SDValue LHS, SDValue RHS, SelectionDAG &DAG,
1309 if (!isFloatingPointZero(RHS))
1310 Cmp = DAG.getNode(ARMISD::CMPFP, dl, MVT::Flag, LHS, RHS);
1312 Cmp = DAG.getNode(ARMISD::CMPFPw0, dl, MVT::Flag, LHS);
1313 return DAG.getNode(ARMISD::FMSTAT, dl, MVT::Flag, Cmp);
1316 static SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG,
1317 const ARMSubtarget *ST) {
1318 MVT VT = Op.getValueType();
1319 SDValue LHS = Op.getOperand(0);
1320 SDValue RHS = Op.getOperand(1);
1321 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
1322 SDValue TrueVal = Op.getOperand(2);
1323 SDValue FalseVal = Op.getOperand(3);
1324 DebugLoc dl = Op.getDebugLoc();
1326 if (LHS.getValueType() == MVT::i32) {
1328 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
1329 SDValue Cmp = getARMCmp(LHS, RHS, CC, ARMCC, DAG, ST->isThumb(), dl);
1330 return DAG.getNode(ARMISD::CMOV, dl, VT, FalseVal, TrueVal, ARMCC, CCR,Cmp);
1333 ARMCC::CondCodes CondCode, CondCode2;
1334 if (FPCCToARMCC(CC, CondCode, CondCode2))
1335 std::swap(TrueVal, FalseVal);
1337 SDValue ARMCC = DAG.getConstant(CondCode, MVT::i32);
1338 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
1339 SDValue Cmp = getVFPCmp(LHS, RHS, DAG, dl);
1340 SDValue Result = DAG.getNode(ARMISD::CMOV, dl, VT, FalseVal, TrueVal,
1342 if (CondCode2 != ARMCC::AL) {
1343 SDValue ARMCC2 = DAG.getConstant(CondCode2, MVT::i32);
1344 // FIXME: Needs another CMP because flag can have but one use.
1345 SDValue Cmp2 = getVFPCmp(LHS, RHS, DAG, dl);
1346 Result = DAG.getNode(ARMISD::CMOV, dl, VT,
1347 Result, TrueVal, ARMCC2, CCR, Cmp2);
1352 static SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG,
1353 const ARMSubtarget *ST) {
1354 SDValue Chain = Op.getOperand(0);
1355 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get();
1356 SDValue LHS = Op.getOperand(2);
1357 SDValue RHS = Op.getOperand(3);
1358 SDValue Dest = Op.getOperand(4);
1359 DebugLoc dl = Op.getDebugLoc();
1361 if (LHS.getValueType() == MVT::i32) {
1363 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
1364 SDValue Cmp = getARMCmp(LHS, RHS, CC, ARMCC, DAG, ST->isThumb(), dl);
1365 return DAG.getNode(ARMISD::BRCOND, dl, MVT::Other,
1366 Chain, Dest, ARMCC, CCR,Cmp);
1369 assert(LHS.getValueType() == MVT::f32 || LHS.getValueType() == MVT::f64);
1370 ARMCC::CondCodes CondCode, CondCode2;
1371 if (FPCCToARMCC(CC, CondCode, CondCode2))
1372 // Swap the LHS/RHS of the comparison if needed.
1373 std::swap(LHS, RHS);
1375 SDValue Cmp = getVFPCmp(LHS, RHS, DAG, dl);
1376 SDValue ARMCC = DAG.getConstant(CondCode, MVT::i32);
1377 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
1378 SDVTList VTList = DAG.getVTList(MVT::Other, MVT::Flag);
1379 SDValue Ops[] = { Chain, Dest, ARMCC, CCR, Cmp };
1380 SDValue Res = DAG.getNode(ARMISD::BRCOND, dl, VTList, Ops, 5);
1381 if (CondCode2 != ARMCC::AL) {
1382 ARMCC = DAG.getConstant(CondCode2, MVT::i32);
1383 SDValue Ops[] = { Res, Dest, ARMCC, CCR, Res.getValue(1) };
1384 Res = DAG.getNode(ARMISD::BRCOND, dl, VTList, Ops, 5);
1389 SDValue ARMTargetLowering::LowerBR_JT(SDValue Op, SelectionDAG &DAG) {
1390 SDValue Chain = Op.getOperand(0);
1391 SDValue Table = Op.getOperand(1);
1392 SDValue Index = Op.getOperand(2);
1393 DebugLoc dl = Op.getDebugLoc();
1395 MVT PTy = getPointerTy();
1396 JumpTableSDNode *JT = cast<JumpTableSDNode>(Table);
1397 ARMFunctionInfo *AFI = DAG.getMachineFunction().getInfo<ARMFunctionInfo>();
1398 SDValue UId = DAG.getConstant(AFI->createJumpTableUId(), PTy);
1399 SDValue JTI = DAG.getTargetJumpTable(JT->getIndex(), PTy);
1400 Table = DAG.getNode(ARMISD::WrapperJT, dl, MVT::i32, JTI, UId);
1401 Index = DAG.getNode(ISD::MUL, dl, PTy, Index, DAG.getConstant(4, PTy));
1402 SDValue Addr = DAG.getNode(ISD::ADD, dl, PTy, Index, Table);
1403 bool isPIC = getTargetMachine().getRelocationModel() == Reloc::PIC_;
1404 Addr = DAG.getLoad(isPIC ? (MVT)MVT::i32 : PTy, dl,
1405 Chain, Addr, NULL, 0);
1406 Chain = Addr.getValue(1);
1408 Addr = DAG.getNode(ISD::ADD, dl, PTy, Addr, Table);
1409 return DAG.getNode(ARMISD::BR_JT, dl, MVT::Other, Chain, Addr, JTI, UId);
1412 static SDValue LowerFP_TO_INT(SDValue Op, SelectionDAG &DAG) {
1413 DebugLoc dl = Op.getDebugLoc();
1415 Op.getOpcode() == ISD::FP_TO_SINT ? ARMISD::FTOSI : ARMISD::FTOUI;
1416 Op = DAG.getNode(Opc, dl, MVT::f32, Op.getOperand(0));
1417 return DAG.getNode(ISD::BIT_CONVERT, dl, MVT::i32, Op);
1420 static SDValue LowerINT_TO_FP(SDValue Op, SelectionDAG &DAG) {
1421 MVT VT = Op.getValueType();
1422 DebugLoc dl = Op.getDebugLoc();
1424 Op.getOpcode() == ISD::SINT_TO_FP ? ARMISD::SITOF : ARMISD::UITOF;
1426 Op = DAG.getNode(ISD::BIT_CONVERT, dl, MVT::f32, Op.getOperand(0));
1427 return DAG.getNode(Opc, dl, VT, Op);
1430 static SDValue LowerFCOPYSIGN(SDValue Op, SelectionDAG &DAG) {
1431 // Implement fcopysign with a fabs and a conditional fneg.
1432 SDValue Tmp0 = Op.getOperand(0);
1433 SDValue Tmp1 = Op.getOperand(1);
1434 DebugLoc dl = Op.getDebugLoc();
1435 MVT VT = Op.getValueType();
1436 MVT SrcVT = Tmp1.getValueType();
1437 SDValue AbsVal = DAG.getNode(ISD::FABS, dl, VT, Tmp0);
1438 SDValue Cmp = getVFPCmp(Tmp1, DAG.getConstantFP(0.0, SrcVT), DAG, dl);
1439 SDValue ARMCC = DAG.getConstant(ARMCC::LT, MVT::i32);
1440 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
1441 return DAG.getNode(ARMISD::CNEG, dl, VT, AbsVal, AbsVal, ARMCC, CCR, Cmp);
1445 ARMTargetLowering::EmitTargetCodeForMemcpy(SelectionDAG &DAG, DebugLoc dl,
1447 SDValue Dst, SDValue Src,
1448 SDValue Size, unsigned Align,
1450 const Value *DstSV, uint64_t DstSVOff,
1451 const Value *SrcSV, uint64_t SrcSVOff){
1452 // Do repeated 4-byte loads and stores. To be improved.
1453 // This requires 4-byte alignment.
1454 if ((Align & 3) != 0)
1456 // This requires the copy size to be a constant, preferrably
1457 // within a subtarget-specific limit.
1458 ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size);
1461 uint64_t SizeVal = ConstantSize->getZExtValue();
1462 if (!AlwaysInline && SizeVal > getSubtarget()->getMaxInlineSizeThreshold())
1465 unsigned BytesLeft = SizeVal & 3;
1466 unsigned NumMemOps = SizeVal >> 2;
1467 unsigned EmittedNumMemOps = 0;
1469 unsigned VTSize = 4;
1471 const unsigned MAX_LOADS_IN_LDM = 6;
1472 SDValue TFOps[MAX_LOADS_IN_LDM];
1473 SDValue Loads[MAX_LOADS_IN_LDM];
1474 uint64_t SrcOff = 0, DstOff = 0;
1476 // Emit up to MAX_LOADS_IN_LDM loads, then a TokenFactor barrier, then the
1477 // same number of stores. The loads and stores will get combined into
1478 // ldm/stm later on.
1479 while (EmittedNumMemOps < NumMemOps) {
1481 i < MAX_LOADS_IN_LDM && EmittedNumMemOps + i < NumMemOps; ++i) {
1482 Loads[i] = DAG.getLoad(VT, dl, Chain,
1483 DAG.getNode(ISD::ADD, dl, MVT::i32, Src,
1484 DAG.getConstant(SrcOff, MVT::i32)),
1485 SrcSV, SrcSVOff + SrcOff);
1486 TFOps[i] = Loads[i].getValue(1);
1489 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &TFOps[0], i);
1492 i < MAX_LOADS_IN_LDM && EmittedNumMemOps + i < NumMemOps; ++i) {
1493 TFOps[i] = DAG.getStore(Chain, dl, Loads[i],
1494 DAG.getNode(ISD::ADD, dl, MVT::i32, Dst,
1495 DAG.getConstant(DstOff, MVT::i32)),
1496 DstSV, DstSVOff + DstOff);
1499 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &TFOps[0], i);
1501 EmittedNumMemOps += i;
1507 // Issue loads / stores for the trailing (1 - 3) bytes.
1508 unsigned BytesLeftSave = BytesLeft;
1511 if (BytesLeft >= 2) {
1519 Loads[i] = DAG.getLoad(VT, dl, Chain,
1520 DAG.getNode(ISD::ADD, dl, MVT::i32, Src,
1521 DAG.getConstant(SrcOff, MVT::i32)),
1522 SrcSV, SrcSVOff + SrcOff);
1523 TFOps[i] = Loads[i].getValue(1);
1526 BytesLeft -= VTSize;
1528 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &TFOps[0], i);
1531 BytesLeft = BytesLeftSave;
1533 if (BytesLeft >= 2) {
1541 TFOps[i] = DAG.getStore(Chain, dl, Loads[i],
1542 DAG.getNode(ISD::ADD, dl, MVT::i32, Dst,
1543 DAG.getConstant(DstOff, MVT::i32)),
1544 DstSV, DstSVOff + DstOff);
1547 BytesLeft -= VTSize;
1549 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &TFOps[0], i);
1552 static SDValue ExpandBIT_CONVERT(SDNode *N, SelectionDAG &DAG) {
1553 SDValue Op = N->getOperand(0);
1554 DebugLoc dl = N->getDebugLoc();
1555 if (N->getValueType(0) == MVT::f64) {
1556 // Turn i64->f64 into FMDRR.
1557 SDValue Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, Op,
1558 DAG.getConstant(0, MVT::i32));
1559 SDValue Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, Op,
1560 DAG.getConstant(1, MVT::i32));
1561 return DAG.getNode(ARMISD::FMDRR, dl, MVT::f64, Lo, Hi);
1564 // Turn f64->i64 into FMRRD.
1565 SDValue Cvt = DAG.getNode(ARMISD::FMRRD, dl,
1566 DAG.getVTList(MVT::i32, MVT::i32), &Op, 1);
1568 // Merge the pieces into a single i64 value.
1569 return DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, Cvt, Cvt.getValue(1));
1572 static SDValue ExpandSRx(SDNode *N, SelectionDAG &DAG, const ARMSubtarget *ST) {
1573 assert(N->getValueType(0) == MVT::i64 &&
1574 (N->getOpcode() == ISD::SRL || N->getOpcode() == ISD::SRA) &&
1575 "Unknown shift to lower!");
1577 // We only lower SRA, SRL of 1 here, all others use generic lowering.
1578 if (!isa<ConstantSDNode>(N->getOperand(1)) ||
1579 cast<ConstantSDNode>(N->getOperand(1))->getZExtValue() != 1)
1582 // If we are in thumb mode, we don't have RRX.
1583 if (ST->isThumb()) return SDValue();
1585 // Okay, we have a 64-bit SRA or SRL of 1. Lower this to an RRX expr.
1586 DebugLoc dl = N->getDebugLoc();
1587 SDValue Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, N->getOperand(0),
1588 DAG.getConstant(0, MVT::i32));
1589 SDValue Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, N->getOperand(0),
1590 DAG.getConstant(1, MVT::i32));
1592 // First, build a SRA_FLAG/SRL_FLAG op, which shifts the top part by one and
1593 // captures the result into a carry flag.
1594 unsigned Opc = N->getOpcode() == ISD::SRL ? ARMISD::SRL_FLAG:ARMISD::SRA_FLAG;
1595 Hi = DAG.getNode(Opc, dl, DAG.getVTList(MVT::i32, MVT::Flag), &Hi, 1);
1597 // The low part is an ARMISD::RRX operand, which shifts the carry in.
1598 Lo = DAG.getNode(ARMISD::RRX, dl, MVT::i32, Lo, Hi.getValue(1));
1600 // Merge the pieces into a single i64 value.
1601 return DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, Lo, Hi);
1604 SDValue ARMTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) {
1605 switch (Op.getOpcode()) {
1606 default: assert(0 && "Don't know how to custom lower this!"); abort();
1607 case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
1608 case ISD::GlobalAddress:
1609 return Subtarget->isTargetDarwin() ? LowerGlobalAddressDarwin(Op, DAG) :
1610 LowerGlobalAddressELF(Op, DAG);
1611 case ISD::GlobalTLSAddress: return LowerGlobalTLSAddress(Op, DAG);
1612 case ISD::CALL: return LowerCALL(Op, DAG);
1613 case ISD::RET: return LowerRET(Op, DAG);
1614 case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG, Subtarget);
1615 case ISD::BR_CC: return LowerBR_CC(Op, DAG, Subtarget);
1616 case ISD::BR_JT: return LowerBR_JT(Op, DAG);
1617 case ISD::VASTART: return LowerVASTART(Op, DAG, VarArgsFrameIndex);
1618 case ISD::SINT_TO_FP:
1619 case ISD::UINT_TO_FP: return LowerINT_TO_FP(Op, DAG);
1620 case ISD::FP_TO_SINT:
1621 case ISD::FP_TO_UINT: return LowerFP_TO_INT(Op, DAG);
1622 case ISD::FCOPYSIGN: return LowerFCOPYSIGN(Op, DAG);
1623 case ISD::FORMAL_ARGUMENTS: return LowerFORMAL_ARGUMENTS(Op, DAG);
1624 case ISD::RETURNADDR: break;
1625 case ISD::FRAMEADDR: break;
1626 case ISD::GLOBAL_OFFSET_TABLE: return LowerGLOBAL_OFFSET_TABLE(Op, DAG);
1627 case ISD::INTRINSIC_WO_CHAIN: return LowerINTRINSIC_WO_CHAIN(Op, DAG);
1628 case ISD::BIT_CONVERT: return ExpandBIT_CONVERT(Op.getNode(), DAG);
1630 case ISD::SRA: return ExpandSRx(Op.getNode(), DAG,Subtarget);
1635 /// ReplaceNodeResults - Replace the results of node with an illegal result
1636 /// type with new values built out of custom code.
1637 void ARMTargetLowering::ReplaceNodeResults(SDNode *N,
1638 SmallVectorImpl<SDValue>&Results,
1639 SelectionDAG &DAG) {
1640 switch (N->getOpcode()) {
1642 assert(0 && "Don't know how to custom expand this!");
1644 case ISD::BIT_CONVERT:
1645 Results.push_back(ExpandBIT_CONVERT(N, DAG));
1649 SDValue Res = ExpandSRx(N, DAG, Subtarget);
1651 Results.push_back(Res);
1657 //===----------------------------------------------------------------------===//
1658 // ARM Scheduler Hooks
1659 //===----------------------------------------------------------------------===//
1662 ARMTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
1663 MachineBasicBlock *BB) const {
1664 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
1665 DebugLoc dl = MI->getDebugLoc();
1666 switch (MI->getOpcode()) {
1667 default: assert(false && "Unexpected instr type to insert");
1668 case ARM::tMOVCCr: {
1669 // To "insert" a SELECT_CC instruction, we actually have to insert the
1670 // diamond control-flow pattern. The incoming instruction knows the
1671 // destination vreg to set, the condition code register to branch on, the
1672 // true/false values to select between, and a branch opcode to use.
1673 const BasicBlock *LLVM_BB = BB->getBasicBlock();
1674 MachineFunction::iterator It = BB;
1680 // cmpTY ccX, r1, r2
1682 // fallthrough --> copy0MBB
1683 MachineBasicBlock *thisMBB = BB;
1684 MachineFunction *F = BB->getParent();
1685 MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
1686 MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
1687 BuildMI(BB, dl, TII->get(ARM::tBcc)).addMBB(sinkMBB)
1688 .addImm(MI->getOperand(3).getImm()).addReg(MI->getOperand(4).getReg());
1689 F->insert(It, copy0MBB);
1690 F->insert(It, sinkMBB);
1691 // Update machine-CFG edges by first adding all successors of the current
1692 // block to the new block which will contain the Phi node for the select.
1693 for(MachineBasicBlock::succ_iterator i = BB->succ_begin(),
1694 e = BB->succ_end(); i != e; ++i)
1695 sinkMBB->addSuccessor(*i);
1696 // Next, remove all successors of the current block, and add the true
1697 // and fallthrough blocks as its successors.
1698 while(!BB->succ_empty())
1699 BB->removeSuccessor(BB->succ_begin());
1700 BB->addSuccessor(copy0MBB);
1701 BB->addSuccessor(sinkMBB);
1704 // %FalseValue = ...
1705 // # fallthrough to sinkMBB
1708 // Update machine-CFG edges
1709 BB->addSuccessor(sinkMBB);
1712 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
1715 BuildMI(BB, dl, TII->get(ARM::PHI), MI->getOperand(0).getReg())
1716 .addReg(MI->getOperand(1).getReg()).addMBB(copy0MBB)
1717 .addReg(MI->getOperand(2).getReg()).addMBB(thisMBB);
1719 F->DeleteMachineInstr(MI); // The pseudo instruction is gone now.
1725 //===----------------------------------------------------------------------===//
1726 // ARM Optimization Hooks
1727 //===----------------------------------------------------------------------===//
1730 SDValue combineSelectAndUse(SDNode *N, SDValue Slct, SDValue OtherOp,
1731 TargetLowering::DAGCombinerInfo &DCI) {
1732 SelectionDAG &DAG = DCI.DAG;
1733 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
1734 MVT VT = N->getValueType(0);
1735 unsigned Opc = N->getOpcode();
1736 bool isSlctCC = Slct.getOpcode() == ISD::SELECT_CC;
1737 SDValue LHS = isSlctCC ? Slct.getOperand(2) : Slct.getOperand(1);
1738 SDValue RHS = isSlctCC ? Slct.getOperand(3) : Slct.getOperand(2);
1739 ISD::CondCode CC = ISD::SETCC_INVALID;
1742 CC = cast<CondCodeSDNode>(Slct.getOperand(4))->get();
1744 SDValue CCOp = Slct.getOperand(0);
1745 if (CCOp.getOpcode() == ISD::SETCC)
1746 CC = cast<CondCodeSDNode>(CCOp.getOperand(2))->get();
1749 bool DoXform = false;
1751 assert ((Opc == ISD::ADD || (Opc == ISD::SUB && Slct == N->getOperand(1))) &&
1754 if (LHS.getOpcode() == ISD::Constant &&
1755 cast<ConstantSDNode>(LHS)->isNullValue()) {
1757 } else if (CC != ISD::SETCC_INVALID &&
1758 RHS.getOpcode() == ISD::Constant &&
1759 cast<ConstantSDNode>(RHS)->isNullValue()) {
1760 std::swap(LHS, RHS);
1761 SDValue Op0 = Slct.getOperand(0);
1762 MVT OpVT = isSlctCC ? Op0.getValueType() :
1763 Op0.getOperand(0).getValueType();
1764 bool isInt = OpVT.isInteger();
1765 CC = ISD::getSetCCInverse(CC, isInt);
1767 if (!TLI.isCondCodeLegal(CC, OpVT))
1768 return SDValue(); // Inverse operator isn't legal.
1775 SDValue Result = DAG.getNode(Opc, RHS.getDebugLoc(), VT, OtherOp, RHS);
1777 return DAG.getSelectCC(N->getDebugLoc(), OtherOp, Result,
1778 Slct.getOperand(0), Slct.getOperand(1), CC);
1779 SDValue CCOp = Slct.getOperand(0);
1781 CCOp = DAG.getSetCC(Slct.getDebugLoc(), CCOp.getValueType(),
1782 CCOp.getOperand(0), CCOp.getOperand(1), CC);
1783 return DAG.getNode(ISD::SELECT, N->getDebugLoc(), VT,
1784 CCOp, OtherOp, Result);
1789 /// PerformADDCombine - Target-specific dag combine xforms for ISD::ADD.
1790 static SDValue PerformADDCombine(SDNode *N,
1791 TargetLowering::DAGCombinerInfo &DCI) {
1792 // added by evan in r37685 with no testcase.
1793 SDValue N0 = N->getOperand(0), N1 = N->getOperand(1);
1795 // fold (add (select cc, 0, c), x) -> (select cc, x, (add, x, c))
1796 if (N0.getOpcode() == ISD::SELECT && N0.getNode()->hasOneUse()) {
1797 SDValue Result = combineSelectAndUse(N, N0, N1, DCI);
1798 if (Result.getNode()) return Result;
1800 if (N1.getOpcode() == ISD::SELECT && N1.getNode()->hasOneUse()) {
1801 SDValue Result = combineSelectAndUse(N, N1, N0, DCI);
1802 if (Result.getNode()) return Result;
1808 /// PerformSUBCombine - Target-specific dag combine xforms for ISD::SUB.
1809 static SDValue PerformSUBCombine(SDNode *N,
1810 TargetLowering::DAGCombinerInfo &DCI) {
1811 // added by evan in r37685 with no testcase.
1812 SDValue N0 = N->getOperand(0), N1 = N->getOperand(1);
1814 // fold (sub x, (select cc, 0, c)) -> (select cc, x, (sub, x, c))
1815 if (N1.getOpcode() == ISD::SELECT && N1.getNode()->hasOneUse()) {
1816 SDValue Result = combineSelectAndUse(N, N1, N0, DCI);
1817 if (Result.getNode()) return Result;
1824 /// PerformFMRRDCombine - Target-specific dag combine xforms for ARMISD::FMRRD.
1825 static SDValue PerformFMRRDCombine(SDNode *N,
1826 TargetLowering::DAGCombinerInfo &DCI) {
1827 // fmrrd(fmdrr x, y) -> x,y
1828 SDValue InDouble = N->getOperand(0);
1829 if (InDouble.getOpcode() == ARMISD::FMDRR)
1830 return DCI.CombineTo(N, InDouble.getOperand(0), InDouble.getOperand(1));
1834 SDValue ARMTargetLowering::PerformDAGCombine(SDNode *N,
1835 DAGCombinerInfo &DCI) const {
1836 switch (N->getOpcode()) {
1838 case ISD::ADD: return PerformADDCombine(N, DCI);
1839 case ISD::SUB: return PerformSUBCombine(N, DCI);
1840 case ARMISD::FMRRD: return PerformFMRRDCombine(N, DCI);
1846 /// isLegalAddressImmediate - Return true if the integer value can be used
1847 /// as the offset of the target addressing mode for load / store of the
1849 static bool isLegalAddressImmediate(int64_t V, MVT VT,
1850 const ARMSubtarget *Subtarget) {
1857 if (Subtarget->isThumb()) {
1862 switch (VT.getSimpleVT()) {
1863 default: return false;
1878 if ((V & (Scale - 1)) != 0)
1881 return V == (V & ((1LL << 5) - 1));
1886 switch (VT.getSimpleVT()) {
1887 default: return false;
1892 return V == (V & ((1LL << 12) - 1));
1895 return V == (V & ((1LL << 8) - 1));
1898 if (!Subtarget->hasVFP2())
1903 return V == (V & ((1LL << 8) - 1));
1907 /// isLegalAddressingMode - Return true if the addressing mode represented
1908 /// by AM is legal for this target, for a load/store of the specified type.
1909 bool ARMTargetLowering::isLegalAddressingMode(const AddrMode &AM,
1910 const Type *Ty) const {
1911 MVT VT = getValueType(Ty, true);
1912 if (!isLegalAddressImmediate(AM.BaseOffs, VT, Subtarget))
1915 // Can never fold addr of global into load/store.
1920 case 0: // no scale reg, must be "r+i" or "r", or "i".
1923 if (Subtarget->isThumb())
1927 // ARM doesn't support any R+R*scale+imm addr modes.
1934 int Scale = AM.Scale;
1935 switch (VT.getSimpleVT()) {
1936 default: return false;
1941 // This assumes i64 is legalized to a pair of i32. If not (i.e.
1942 // ldrd / strd are used, then its address mode is same as i16.
1944 if (Scale < 0) Scale = -Scale;
1948 return isPowerOf2_32(Scale & ~1);
1951 if (((unsigned)AM.HasBaseReg + Scale) <= 2)
1956 // Note, we allow "void" uses (basically, uses that aren't loads or
1957 // stores), because arm allows folding a scale into many arithmetic
1958 // operations. This should be made more precise and revisited later.
1960 // Allow r << imm, but the imm has to be a multiple of two.
1961 if (AM.Scale & 1) return false;
1962 return isPowerOf2_32(AM.Scale);
1969 static bool getIndexedAddressParts(SDNode *Ptr, MVT VT,
1970 bool isSEXTLoad, SDValue &Base,
1971 SDValue &Offset, bool &isInc,
1972 SelectionDAG &DAG) {
1973 if (Ptr->getOpcode() != ISD::ADD && Ptr->getOpcode() != ISD::SUB)
1976 if (VT == MVT::i16 || ((VT == MVT::i8 || VT == MVT::i1) && isSEXTLoad)) {
1978 Base = Ptr->getOperand(0);
1979 if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Ptr->getOperand(1))) {
1980 int RHSC = (int)RHS->getZExtValue();
1981 if (RHSC < 0 && RHSC > -256) {
1983 Offset = DAG.getConstant(-RHSC, RHS->getValueType(0));
1987 isInc = (Ptr->getOpcode() == ISD::ADD);
1988 Offset = Ptr->getOperand(1);
1990 } else if (VT == MVT::i32 || VT == MVT::i8 || VT == MVT::i1) {
1992 if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Ptr->getOperand(1))) {
1993 int RHSC = (int)RHS->getZExtValue();
1994 if (RHSC < 0 && RHSC > -0x1000) {
1996 Offset = DAG.getConstant(-RHSC, RHS->getValueType(0));
1997 Base = Ptr->getOperand(0);
2002 if (Ptr->getOpcode() == ISD::ADD) {
2004 ARM_AM::ShiftOpc ShOpcVal= ARM_AM::getShiftOpcForNode(Ptr->getOperand(0));
2005 if (ShOpcVal != ARM_AM::no_shift) {
2006 Base = Ptr->getOperand(1);
2007 Offset = Ptr->getOperand(0);
2009 Base = Ptr->getOperand(0);
2010 Offset = Ptr->getOperand(1);
2015 isInc = (Ptr->getOpcode() == ISD::ADD);
2016 Base = Ptr->getOperand(0);
2017 Offset = Ptr->getOperand(1);
2021 // FIXME: Use FLDM / FSTM to emulate indexed FP load / store.
2025 /// getPreIndexedAddressParts - returns true by value, base pointer and
2026 /// offset pointer and addressing mode by reference if the node's address
2027 /// can be legally represented as pre-indexed load / store address.
2029 ARMTargetLowering::getPreIndexedAddressParts(SDNode *N, SDValue &Base,
2031 ISD::MemIndexedMode &AM,
2032 SelectionDAG &DAG) const {
2033 if (Subtarget->isThumb())
2038 bool isSEXTLoad = false;
2039 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
2040 Ptr = LD->getBasePtr();
2041 VT = LD->getMemoryVT();
2042 isSEXTLoad = LD->getExtensionType() == ISD::SEXTLOAD;
2043 } else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
2044 Ptr = ST->getBasePtr();
2045 VT = ST->getMemoryVT();
2050 bool isLegal = getIndexedAddressParts(Ptr.getNode(), VT, isSEXTLoad, Base, Offset,
2053 AM = isInc ? ISD::PRE_INC : ISD::PRE_DEC;
2059 /// getPostIndexedAddressParts - returns true by value, base pointer and
2060 /// offset pointer and addressing mode by reference if this node can be
2061 /// combined with a load / store to form a post-indexed load / store.
2062 bool ARMTargetLowering::getPostIndexedAddressParts(SDNode *N, SDNode *Op,
2065 ISD::MemIndexedMode &AM,
2066 SelectionDAG &DAG) const {
2067 if (Subtarget->isThumb())
2072 bool isSEXTLoad = false;
2073 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
2074 VT = LD->getMemoryVT();
2075 isSEXTLoad = LD->getExtensionType() == ISD::SEXTLOAD;
2076 } else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
2077 VT = ST->getMemoryVT();
2082 bool isLegal = getIndexedAddressParts(Op, VT, isSEXTLoad, Base, Offset,
2085 AM = isInc ? ISD::POST_INC : ISD::POST_DEC;
2091 void ARMTargetLowering::computeMaskedBitsForTargetNode(const SDValue Op,
2095 const SelectionDAG &DAG,
2096 unsigned Depth) const {
2097 KnownZero = KnownOne = APInt(Mask.getBitWidth(), 0);
2098 switch (Op.getOpcode()) {
2100 case ARMISD::CMOV: {
2101 // Bits are known zero/one if known on the LHS and RHS.
2102 DAG.ComputeMaskedBits(Op.getOperand(0), Mask, KnownZero, KnownOne, Depth+1);
2103 if (KnownZero == 0 && KnownOne == 0) return;
2105 APInt KnownZeroRHS, KnownOneRHS;
2106 DAG.ComputeMaskedBits(Op.getOperand(1), Mask,
2107 KnownZeroRHS, KnownOneRHS, Depth+1);
2108 KnownZero &= KnownZeroRHS;
2109 KnownOne &= KnownOneRHS;
2115 //===----------------------------------------------------------------------===//
2116 // ARM Inline Assembly Support
2117 //===----------------------------------------------------------------------===//
2119 /// getConstraintType - Given a constraint letter, return the type of
2120 /// constraint it is for this target.
2121 ARMTargetLowering::ConstraintType
2122 ARMTargetLowering::getConstraintType(const std::string &Constraint) const {
2123 if (Constraint.size() == 1) {
2124 switch (Constraint[0]) {
2126 case 'l': return C_RegisterClass;
2127 case 'w': return C_RegisterClass;
2130 return TargetLowering::getConstraintType(Constraint);
2133 std::pair<unsigned, const TargetRegisterClass*>
2134 ARMTargetLowering::getRegForInlineAsmConstraint(const std::string &Constraint,
2136 if (Constraint.size() == 1) {
2137 // GCC RS6000 Constraint Letters
2138 switch (Constraint[0]) {
2140 if (Subtarget->isThumb())
2141 return std::make_pair(0U, ARM::tGPRRegisterClass);
2143 return std::make_pair(0U, ARM::GPRRegisterClass);
2145 return std::make_pair(0U, ARM::GPRRegisterClass);
2148 return std::make_pair(0U, ARM::SPRRegisterClass);
2150 return std::make_pair(0U, ARM::DPRRegisterClass);
2154 return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
2157 std::vector<unsigned> ARMTargetLowering::
2158 getRegClassForInlineAsmConstraint(const std::string &Constraint,
2160 if (Constraint.size() != 1)
2161 return std::vector<unsigned>();
2163 switch (Constraint[0]) { // GCC ARM Constraint Letters
2166 return make_vector<unsigned>(ARM::R0, ARM::R1, ARM::R2, ARM::R3,
2167 ARM::R4, ARM::R5, ARM::R6, ARM::R7,
2170 return make_vector<unsigned>(ARM::R0, ARM::R1, ARM::R2, ARM::R3,
2171 ARM::R4, ARM::R5, ARM::R6, ARM::R7,
2172 ARM::R8, ARM::R9, ARM::R10, ARM::R11,
2173 ARM::R12, ARM::LR, 0);
2176 return make_vector<unsigned>(ARM::S0, ARM::S1, ARM::S2, ARM::S3,
2177 ARM::S4, ARM::S5, ARM::S6, ARM::S7,
2178 ARM::S8, ARM::S9, ARM::S10, ARM::S11,
2179 ARM::S12,ARM::S13,ARM::S14,ARM::S15,
2180 ARM::S16,ARM::S17,ARM::S18,ARM::S19,
2181 ARM::S20,ARM::S21,ARM::S22,ARM::S23,
2182 ARM::S24,ARM::S25,ARM::S26,ARM::S27,
2183 ARM::S28,ARM::S29,ARM::S30,ARM::S31, 0);
2185 return make_vector<unsigned>(ARM::D0, ARM::D1, ARM::D2, ARM::D3,
2186 ARM::D4, ARM::D5, ARM::D6, ARM::D7,
2187 ARM::D8, ARM::D9, ARM::D10,ARM::D11,
2188 ARM::D12,ARM::D13,ARM::D14,ARM::D15, 0);
2192 return std::vector<unsigned>();
2195 /// LowerAsmOperandForConstraint - Lower the specified operand into the Ops
2196 /// vector. If it is invalid, don't add anything to Ops.
2197 void ARMTargetLowering::LowerAsmOperandForConstraint(SDValue Op,
2200 std::vector<SDValue>&Ops,
2201 SelectionDAG &DAG) const {
2202 SDValue Result(0, 0);
2204 switch (Constraint) {
2206 case 'I': case 'J': case 'K': case 'L':
2207 case 'M': case 'N': case 'O':
2208 ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op);
2212 int64_t CVal64 = C->getSExtValue();
2213 int CVal = (int) CVal64;
2214 // None of these constraints allow values larger than 32 bits. Check
2215 // that the value fits in an int.
2219 switch (Constraint) {
2221 if (Subtarget->isThumb()) {
2222 // This must be a constant between 0 and 255, for ADD immediates.
2223 if (CVal >= 0 && CVal <= 255)
2226 // A constant that can be used as an immediate value in a
2227 // data-processing instruction.
2228 if (ARM_AM::getSOImmVal(CVal) != -1)
2234 if (Subtarget->isThumb()) {
2235 // This must be a constant between -255 and -1, for negated ADD
2236 // immediates. This can be used in GCC with an "n" modifier that
2237 // prints the negated value, for use with SUB instructions. It is
2238 // not useful otherwise but is implemented for compatibility.
2239 if (CVal >= -255 && CVal <= -1)
2242 // This must be a constant between -4095 and 4095. It is not clear
2243 // what this constraint is intended for. Implemented for
2244 // compatibility with GCC.
2245 if (CVal >= -4095 && CVal <= 4095)
2251 if (Subtarget->isThumb()) {
2252 // A 32-bit value where only one byte has a nonzero value. Exclude
2253 // zero to match GCC. This constraint is used by GCC internally for
2254 // constants that can be loaded with a move/shift combination.
2255 // It is not useful otherwise but is implemented for compatibility.
2256 if (CVal != 0 && ARM_AM::isThumbImmShiftedVal(CVal))
2259 // A constant whose bitwise inverse can be used as an immediate
2260 // value in a data-processing instruction. This can be used in GCC
2261 // with a "B" modifier that prints the inverted value, for use with
2262 // BIC and MVN instructions. It is not useful otherwise but is
2263 // implemented for compatibility.
2264 if (ARM_AM::getSOImmVal(~CVal) != -1)
2270 if (Subtarget->isThumb()) {
2271 // This must be a constant between -7 and 7,
2272 // for 3-operand ADD/SUB immediate instructions.
2273 if (CVal >= -7 && CVal < 7)
2276 // A constant whose negation can be used as an immediate value in a
2277 // data-processing instruction. This can be used in GCC with an "n"
2278 // modifier that prints the negated value, for use with SUB
2279 // instructions. It is not useful otherwise but is implemented for
2281 if (ARM_AM::getSOImmVal(-CVal) != -1)
2287 if (Subtarget->isThumb()) {
2288 // This must be a multiple of 4 between 0 and 1020, for
2289 // ADD sp + immediate.
2290 if ((CVal >= 0 && CVal <= 1020) && ((CVal & 3) == 0))
2293 // A power of two or a constant between 0 and 32. This is used in
2294 // GCC for the shift amount on shifted register operands, but it is
2295 // useful in general for any shift amounts.
2296 if ((CVal >= 0 && CVal <= 32) || ((CVal & (CVal - 1)) == 0))
2302 if (Subtarget->isThumb()) {
2303 // This must be a constant between 0 and 31, for shift amounts.
2304 if (CVal >= 0 && CVal <= 31)
2310 if (Subtarget->isThumb()) {
2311 // This must be a multiple of 4 between -508 and 508, for
2312 // ADD/SUB sp = sp + immediate.
2313 if ((CVal >= -508 && CVal <= 508) && ((CVal & 3) == 0))
2318 Result = DAG.getTargetConstant(CVal, Op.getValueType());
2322 if (Result.getNode()) {
2323 Ops.push_back(Result);
2326 return TargetLowering::LowerAsmOperandForConstraint(Op, Constraint, hasMemory,