1 //===-- PPCISelLowering.cpp - PPC DAG Lowering Implementation -------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by Chris Lattner and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the PPCISelLowering class.
12 //===----------------------------------------------------------------------===//
14 #include "PPCISelLowering.h"
15 #include "PPCTargetMachine.h"
16 #include "llvm/ADT/VectorExtras.h"
17 #include "llvm/CodeGen/MachineFrameInfo.h"
18 #include "llvm/CodeGen/MachineFunction.h"
19 #include "llvm/CodeGen/MachineInstrBuilder.h"
20 #include "llvm/CodeGen/SelectionDAG.h"
21 #include "llvm/CodeGen/SSARegMap.h"
22 #include "llvm/Constants.h"
23 #include "llvm/Function.h"
24 #include "llvm/Support/MathExtras.h"
25 #include "llvm/Target/TargetOptions.h"
28 PPCTargetLowering::PPCTargetLowering(TargetMachine &TM)
29 : TargetLowering(TM) {
31 // Fold away setcc operations if possible.
32 setSetCCIsExpensive();
35 // Use _setjmp/_longjmp instead of setjmp/longjmp.
36 setUseUnderscoreSetJmpLongJmp(true);
38 // Set up the register classes.
39 addRegisterClass(MVT::i32, PPC::GPRCRegisterClass);
40 addRegisterClass(MVT::f32, PPC::F4RCRegisterClass);
41 addRegisterClass(MVT::f64, PPC::F8RCRegisterClass);
43 setOperationAction(ISD::ConstantFP, MVT::f64, Expand);
44 setOperationAction(ISD::ConstantFP, MVT::f32, Expand);
46 // PowerPC has no intrinsics for these particular operations
47 setOperationAction(ISD::MEMMOVE, MVT::Other, Expand);
48 setOperationAction(ISD::MEMSET, MVT::Other, Expand);
49 setOperationAction(ISD::MEMCPY, MVT::Other, Expand);
51 // PowerPC has an i16 but no i8 (or i1) SEXTLOAD
52 setOperationAction(ISD::SEXTLOAD, MVT::i1, Expand);
53 setOperationAction(ISD::SEXTLOAD, MVT::i8, Expand);
55 // PowerPC has no SREM/UREM instructions
56 setOperationAction(ISD::SREM, MVT::i32, Expand);
57 setOperationAction(ISD::UREM, MVT::i32, Expand);
59 // We don't support sin/cos/sqrt/fmod
60 setOperationAction(ISD::FSIN , MVT::f64, Expand);
61 setOperationAction(ISD::FCOS , MVT::f64, Expand);
62 setOperationAction(ISD::FREM , MVT::f64, Expand);
63 setOperationAction(ISD::FSIN , MVT::f32, Expand);
64 setOperationAction(ISD::FCOS , MVT::f32, Expand);
65 setOperationAction(ISD::FREM , MVT::f32, Expand);
67 // If we're enabling GP optimizations, use hardware square root
68 if (!TM.getSubtarget<PPCSubtarget>().hasFSQRT()) {
69 setOperationAction(ISD::FSQRT, MVT::f64, Expand);
70 setOperationAction(ISD::FSQRT, MVT::f32, Expand);
73 // PowerPC does not have BSWAP, CTPOP or CTTZ
74 setOperationAction(ISD::BSWAP, MVT::i32 , Expand);
75 setOperationAction(ISD::CTPOP, MVT::i32 , Expand);
76 setOperationAction(ISD::CTTZ , MVT::i32 , Expand);
78 // PowerPC does not have ROTR
79 setOperationAction(ISD::ROTR, MVT::i32 , Expand);
81 // PowerPC does not have Select
82 setOperationAction(ISD::SELECT, MVT::i32, Expand);
83 setOperationAction(ISD::SELECT, MVT::f32, Expand);
84 setOperationAction(ISD::SELECT, MVT::f64, Expand);
86 // PowerPC wants to turn select_cc of FP into fsel when possible.
87 setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
88 setOperationAction(ISD::SELECT_CC, MVT::f64, Custom);
90 // PowerPC wants to optimize integer setcc a bit
91 setOperationAction(ISD::SETCC, MVT::i32, Custom);
93 // PowerPC does not have BRCOND* which requires SetCC
94 setOperationAction(ISD::BRCOND, MVT::Other, Expand);
95 setOperationAction(ISD::BRCONDTWOWAY, MVT::Other, Expand);
97 // PowerPC turns FP_TO_SINT into FCTIWZ and some load/stores.
98 setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom);
100 // PowerPC does not have [U|S]INT_TO_FP
101 setOperationAction(ISD::SINT_TO_FP, MVT::i32, Expand);
102 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Expand);
104 setOperationAction(ISD::BIT_CONVERT, MVT::f32, Expand);
105 setOperationAction(ISD::BIT_CONVERT, MVT::i32, Expand);
107 // PowerPC does not have truncstore for i1.
108 setOperationAction(ISD::TRUNCSTORE, MVT::i1, Promote);
110 // Support label based line numbers.
111 setOperationAction(ISD::LOCATION, MVT::Other, Expand);
112 setOperationAction(ISD::DEBUG_LOC, MVT::Other, Expand);
113 // FIXME - use subtarget debug flags
114 if (!TM.getSubtarget<PPCSubtarget>().isDarwin())
115 setOperationAction(ISD::DEBUG_LABEL, MVT::Other, Expand);
117 // We want to legalize GlobalAddress and ConstantPool nodes into the
118 // appropriate instructions to materialize the address.
119 setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
120 setOperationAction(ISD::ConstantPool, MVT::i32, Custom);
122 // RET must be custom lowered, to meet ABI requirements
123 setOperationAction(ISD::RET , MVT::Other, Custom);
125 // VASTART needs to be custom lowered to use the VarArgsFrameIndex
126 setOperationAction(ISD::VASTART , MVT::Other, Custom);
128 // Use the default implementation.
129 setOperationAction(ISD::VAARG , MVT::Other, Expand);
130 setOperationAction(ISD::VACOPY , MVT::Other, Expand);
131 setOperationAction(ISD::VAEND , MVT::Other, Expand);
132 setOperationAction(ISD::STACKSAVE , MVT::Other, Expand);
133 setOperationAction(ISD::STACKRESTORE , MVT::Other, Expand);
134 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32 , Expand);
136 if (TM.getSubtarget<PPCSubtarget>().is64Bit()) {
137 // They also have instructions for converting between i64 and fp.
138 setOperationAction(ISD::FP_TO_SINT, MVT::i64, Custom);
139 setOperationAction(ISD::SINT_TO_FP, MVT::i64, Custom);
140 // To take advantage of the above i64 FP_TO_SINT, promote i32 FP_TO_UINT
141 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Promote);
143 // PowerPC does not have FP_TO_UINT on 32-bit implementations.
144 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Expand);
147 if (TM.getSubtarget<PPCSubtarget>().has64BitRegs()) {
148 // 64 bit PowerPC implementations can support i64 types directly
149 addRegisterClass(MVT::i64, PPC::G8RCRegisterClass);
150 // BUILD_PAIR can't be handled natively, and should be expanded to shl/or
151 setOperationAction(ISD::BUILD_PAIR, MVT::i64, Expand);
153 // 32 bit PowerPC wants to expand i64 shifts itself.
154 setOperationAction(ISD::SHL, MVT::i64, Custom);
155 setOperationAction(ISD::SRL, MVT::i64, Custom);
156 setOperationAction(ISD::SRA, MVT::i64, Custom);
159 // First set operation action for all vector types to expand. Then we
160 // will selectively turn on ones that can be effectively codegen'd.
161 for (unsigned VT = (unsigned)MVT::Vector + 1;
162 VT != (unsigned)MVT::LAST_VALUETYPE; VT++) {
163 setOperationAction(ISD::ADD , (MVT::ValueType)VT, Expand);
164 setOperationAction(ISD::SUB , (MVT::ValueType)VT, Expand);
165 setOperationAction(ISD::MUL , (MVT::ValueType)VT, Expand);
166 setOperationAction(ISD::LOAD, (MVT::ValueType)VT, Expand);
169 if (TM.getSubtarget<PPCSubtarget>().hasAltivec()) {
170 addRegisterClass(MVT::v4f32, PPC::VRRCRegisterClass);
171 addRegisterClass(MVT::v4i32, PPC::VRRCRegisterClass);
173 setOperationAction(ISD::ADD , MVT::v4f32, Legal);
174 setOperationAction(ISD::SUB , MVT::v4f32, Legal);
175 setOperationAction(ISD::MUL , MVT::v4f32, Legal);
176 setOperationAction(ISD::LOAD , MVT::v4f32, Legal);
177 setOperationAction(ISD::ADD , MVT::v4i32, Legal);
178 setOperationAction(ISD::LOAD , MVT::v4i32, Legal);
179 // FIXME: We don't support any ConstantVec's yet. We should custom expand
181 setOperationAction(ISD::ConstantVec, MVT::v4f32, Expand);
182 setOperationAction(ISD::ConstantVec, MVT::v4i32, Expand);
185 setSetCCResultContents(ZeroOrOneSetCCResult);
186 setStackPointerRegisterToSaveRestore(PPC::R1);
188 computeRegisterProperties();
191 const char *PPCTargetLowering::getTargetNodeName(unsigned Opcode) const {
194 case PPCISD::FSEL: return "PPCISD::FSEL";
195 case PPCISD::FCFID: return "PPCISD::FCFID";
196 case PPCISD::FCTIDZ: return "PPCISD::FCTIDZ";
197 case PPCISD::FCTIWZ: return "PPCISD::FCTIWZ";
198 case PPCISD::VMADDFP: return "PPCISD::VMADDFP";
199 case PPCISD::VNMSUBFP: return "PPCISD::VNMSUBFP";
200 case PPCISD::Hi: return "PPCISD::Hi";
201 case PPCISD::Lo: return "PPCISD::Lo";
202 case PPCISD::GlobalBaseReg: return "PPCISD::GlobalBaseReg";
203 case PPCISD::SRL: return "PPCISD::SRL";
204 case PPCISD::SRA: return "PPCISD::SRA";
205 case PPCISD::SHL: return "PPCISD::SHL";
206 case PPCISD::CALL: return "PPCISD::CALL";
207 case PPCISD::RET_FLAG: return "PPCISD::RET_FLAG";
211 /// isFloatingPointZero - Return true if this is 0.0 or -0.0.
212 static bool isFloatingPointZero(SDOperand Op) {
213 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(Op))
214 return CFP->isExactlyValue(-0.0) || CFP->isExactlyValue(0.0);
215 else if (Op.getOpcode() == ISD::EXTLOAD || Op.getOpcode() == ISD::LOAD) {
216 // Maybe this has already been legalized into the constant pool?
217 if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(Op.getOperand(1)))
218 if (ConstantFP *CFP = dyn_cast<ConstantFP>(CP->get()))
219 return CFP->isExactlyValue(-0.0) || CFP->isExactlyValue(0.0);
224 /// LowerOperation - Provide custom lowering hooks for some operations.
226 SDOperand PPCTargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
227 switch (Op.getOpcode()) {
228 default: assert(0 && "Wasn't expecting to be able to lower this!");
229 case ISD::FP_TO_SINT: {
230 assert(MVT::isFloatingPoint(Op.getOperand(0).getValueType()));
231 SDOperand Src = Op.getOperand(0);
232 if (Src.getValueType() == MVT::f32)
233 Src = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Src);
236 switch (Op.getValueType()) {
237 default: assert(0 && "Unhandled FP_TO_SINT type in custom expander!");
239 Tmp = DAG.getNode(PPCISD::FCTIWZ, MVT::f64, Src);
242 Tmp = DAG.getNode(PPCISD::FCTIDZ, MVT::f64, Src);
246 // Convert the FP value to an int value through memory.
247 SDOperand Bits = DAG.getNode(ISD::BIT_CONVERT, MVT::i64, Tmp);
248 if (Op.getValueType() == MVT::i32)
249 Bits = DAG.getNode(ISD::TRUNCATE, MVT::i32, Bits);
252 case ISD::SINT_TO_FP: {
253 assert(MVT::i64 == Op.getOperand(0).getValueType() &&
254 "Unhandled SINT_TO_FP type in custom expander!");
255 SDOperand Bits = DAG.getNode(ISD::BIT_CONVERT, MVT::f64, Op.getOperand(0));
256 SDOperand FP = DAG.getNode(PPCISD::FCFID, MVT::f64, Bits);
257 if (MVT::f32 == Op.getValueType())
258 FP = DAG.getNode(ISD::FP_ROUND, MVT::f32, FP);
261 case ISD::SELECT_CC: {
262 // Turn FP only select_cc's into fsel instructions.
263 if (!MVT::isFloatingPoint(Op.getOperand(0).getValueType()) ||
264 !MVT::isFloatingPoint(Op.getOperand(2).getValueType()))
267 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
269 // Cannot handle SETEQ/SETNE.
270 if (CC == ISD::SETEQ || CC == ISD::SETNE) break;
272 MVT::ValueType ResVT = Op.getValueType();
273 MVT::ValueType CmpVT = Op.getOperand(0).getValueType();
274 SDOperand LHS = Op.getOperand(0), RHS = Op.getOperand(1);
275 SDOperand TV = Op.getOperand(2), FV = Op.getOperand(3);
277 // If the RHS of the comparison is a 0.0, we don't need to do the
278 // subtraction at all.
279 if (isFloatingPointZero(RHS))
281 default: break; // SETUO etc aren't handled by fsel.
284 std::swap(TV, FV); // fsel is natively setge, swap operands for setlt
287 if (LHS.getValueType() == MVT::f32) // Comparison is always 64-bits
288 LHS = DAG.getNode(ISD::FP_EXTEND, MVT::f64, LHS);
289 return DAG.getNode(PPCISD::FSEL, ResVT, LHS, TV, FV);
292 std::swap(TV, FV); // fsel is natively setge, swap operands for setlt
295 if (LHS.getValueType() == MVT::f32) // Comparison is always 64-bits
296 LHS = DAG.getNode(ISD::FP_EXTEND, MVT::f64, LHS);
297 return DAG.getNode(PPCISD::FSEL, ResVT,
298 DAG.getNode(ISD::FNEG, MVT::f64, LHS), TV, FV);
303 default: break; // SETUO etc aren't handled by fsel.
306 Cmp = DAG.getNode(ISD::FSUB, CmpVT, LHS, RHS);
307 if (Cmp.getValueType() == MVT::f32) // Comparison is always 64-bits
308 Cmp = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Cmp);
309 return DAG.getNode(PPCISD::FSEL, ResVT, Cmp, FV, TV);
312 Cmp = DAG.getNode(ISD::FSUB, CmpVT, LHS, RHS);
313 if (Cmp.getValueType() == MVT::f32) // Comparison is always 64-bits
314 Cmp = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Cmp);
315 return DAG.getNode(PPCISD::FSEL, ResVT, Cmp, TV, FV);
318 Cmp = DAG.getNode(ISD::FSUB, CmpVT, RHS, LHS);
319 if (Cmp.getValueType() == MVT::f32) // Comparison is always 64-bits
320 Cmp = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Cmp);
321 return DAG.getNode(PPCISD::FSEL, ResVT, Cmp, FV, TV);
324 Cmp = DAG.getNode(ISD::FSUB, CmpVT, RHS, LHS);
325 if (Cmp.getValueType() == MVT::f32) // Comparison is always 64-bits
326 Cmp = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Cmp);
327 return DAG.getNode(PPCISD::FSEL, ResVT, Cmp, TV, FV);
332 assert(Op.getValueType() == MVT::i64 &&
333 Op.getOperand(1).getValueType() == MVT::i32 && "Unexpected SHL!");
334 // The generic code does a fine job expanding shift by a constant.
335 if (isa<ConstantSDNode>(Op.getOperand(1))) break;
337 // Otherwise, expand into a bunch of logical ops. Note that these ops
338 // depend on the PPC behavior for oversized shift amounts.
339 SDOperand Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Op.getOperand(0),
340 DAG.getConstant(0, MVT::i32));
341 SDOperand Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Op.getOperand(0),
342 DAG.getConstant(1, MVT::i32));
343 SDOperand Amt = Op.getOperand(1);
345 SDOperand Tmp1 = DAG.getNode(ISD::SUB, MVT::i32,
346 DAG.getConstant(32, MVT::i32), Amt);
347 SDOperand Tmp2 = DAG.getNode(PPCISD::SHL, MVT::i32, Hi, Amt);
348 SDOperand Tmp3 = DAG.getNode(PPCISD::SRL, MVT::i32, Lo, Tmp1);
349 SDOperand Tmp4 = DAG.getNode(ISD::OR , MVT::i32, Tmp2, Tmp3);
350 SDOperand Tmp5 = DAG.getNode(ISD::ADD, MVT::i32, Amt,
351 DAG.getConstant(-32U, MVT::i32));
352 SDOperand Tmp6 = DAG.getNode(PPCISD::SHL, MVT::i32, Lo, Tmp5);
353 SDOperand OutHi = DAG.getNode(ISD::OR, MVT::i32, Tmp4, Tmp6);
354 SDOperand OutLo = DAG.getNode(PPCISD::SHL, MVT::i32, Lo, Amt);
355 return DAG.getNode(ISD::BUILD_PAIR, MVT::i64, OutLo, OutHi);
358 assert(Op.getValueType() == MVT::i64 &&
359 Op.getOperand(1).getValueType() == MVT::i32 && "Unexpected SHL!");
360 // The generic code does a fine job expanding shift by a constant.
361 if (isa<ConstantSDNode>(Op.getOperand(1))) break;
363 // Otherwise, expand into a bunch of logical ops. Note that these ops
364 // depend on the PPC behavior for oversized shift amounts.
365 SDOperand Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Op.getOperand(0),
366 DAG.getConstant(0, MVT::i32));
367 SDOperand Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Op.getOperand(0),
368 DAG.getConstant(1, MVT::i32));
369 SDOperand Amt = Op.getOperand(1);
371 SDOperand Tmp1 = DAG.getNode(ISD::SUB, MVT::i32,
372 DAG.getConstant(32, MVT::i32), Amt);
373 SDOperand Tmp2 = DAG.getNode(PPCISD::SRL, MVT::i32, Lo, Amt);
374 SDOperand Tmp3 = DAG.getNode(PPCISD::SHL, MVT::i32, Hi, Tmp1);
375 SDOperand Tmp4 = DAG.getNode(ISD::OR , MVT::i32, Tmp2, Tmp3);
376 SDOperand Tmp5 = DAG.getNode(ISD::ADD, MVT::i32, Amt,
377 DAG.getConstant(-32U, MVT::i32));
378 SDOperand Tmp6 = DAG.getNode(PPCISD::SRL, MVT::i32, Hi, Tmp5);
379 SDOperand OutLo = DAG.getNode(ISD::OR, MVT::i32, Tmp4, Tmp6);
380 SDOperand OutHi = DAG.getNode(PPCISD::SRL, MVT::i32, Hi, Amt);
381 return DAG.getNode(ISD::BUILD_PAIR, MVT::i64, OutLo, OutHi);
384 assert(Op.getValueType() == MVT::i64 &&
385 Op.getOperand(1).getValueType() == MVT::i32 && "Unexpected SRA!");
386 // The generic code does a fine job expanding shift by a constant.
387 if (isa<ConstantSDNode>(Op.getOperand(1))) break;
389 // Otherwise, expand into a bunch of logical ops, followed by a select_cc.
390 SDOperand Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Op.getOperand(0),
391 DAG.getConstant(0, MVT::i32));
392 SDOperand Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Op.getOperand(0),
393 DAG.getConstant(1, MVT::i32));
394 SDOperand Amt = Op.getOperand(1);
396 SDOperand Tmp1 = DAG.getNode(ISD::SUB, MVT::i32,
397 DAG.getConstant(32, MVT::i32), Amt);
398 SDOperand Tmp2 = DAG.getNode(PPCISD::SRL, MVT::i32, Lo, Amt);
399 SDOperand Tmp3 = DAG.getNode(PPCISD::SHL, MVT::i32, Hi, Tmp1);
400 SDOperand Tmp4 = DAG.getNode(ISD::OR , MVT::i32, Tmp2, Tmp3);
401 SDOperand Tmp5 = DAG.getNode(ISD::ADD, MVT::i32, Amt,
402 DAG.getConstant(-32U, MVT::i32));
403 SDOperand Tmp6 = DAG.getNode(PPCISD::SRA, MVT::i32, Hi, Tmp5);
404 SDOperand OutHi = DAG.getNode(PPCISD::SRA, MVT::i32, Hi, Amt);
405 SDOperand OutLo = DAG.getSelectCC(Tmp5, DAG.getConstant(0, MVT::i32),
406 Tmp4, Tmp6, ISD::SETLE);
407 return DAG.getNode(ISD::BUILD_PAIR, MVT::i64, OutLo, OutHi);
409 case ISD::ConstantPool: {
410 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
411 Constant *C = CP->get();
412 SDOperand CPI = DAG.getTargetConstantPool(C, MVT::i32, CP->getAlignment());
413 SDOperand Zero = DAG.getConstant(0, MVT::i32);
415 if (getTargetMachine().getRelocationModel() == Reloc::Static) {
416 // Generate non-pic code that has direct accesses to the constant pool.
417 // The address of the global is just (hi(&g)+lo(&g)).
418 SDOperand Hi = DAG.getNode(PPCISD::Hi, MVT::i32, CPI, Zero);
419 SDOperand Lo = DAG.getNode(PPCISD::Lo, MVT::i32, CPI, Zero);
420 return DAG.getNode(ISD::ADD, MVT::i32, Hi, Lo);
423 // Only lower ConstantPool on Darwin.
424 if (!getTargetMachine().getSubtarget<PPCSubtarget>().isDarwin()) break;
425 SDOperand Hi = DAG.getNode(PPCISD::Hi, MVT::i32, CPI, Zero);
426 if (getTargetMachine().getRelocationModel() == Reloc::PIC) {
427 // With PIC, the first instruction is actually "GR+hi(&G)".
428 Hi = DAG.getNode(ISD::ADD, MVT::i32,
429 DAG.getNode(PPCISD::GlobalBaseReg, MVT::i32), Hi);
432 SDOperand Lo = DAG.getNode(PPCISD::Lo, MVT::i32, CPI, Zero);
433 Lo = DAG.getNode(ISD::ADD, MVT::i32, Hi, Lo);
436 case ISD::GlobalAddress: {
437 GlobalAddressSDNode *GSDN = cast<GlobalAddressSDNode>(Op);
438 GlobalValue *GV = GSDN->getGlobal();
439 SDOperand GA = DAG.getTargetGlobalAddress(GV, MVT::i32, GSDN->getOffset());
440 SDOperand Zero = DAG.getConstant(0, MVT::i32);
442 if (getTargetMachine().getRelocationModel() == Reloc::Static) {
443 // Generate non-pic code that has direct accesses to globals.
444 // The address of the global is just (hi(&g)+lo(&g)).
445 SDOperand Hi = DAG.getNode(PPCISD::Hi, MVT::i32, GA, Zero);
446 SDOperand Lo = DAG.getNode(PPCISD::Lo, MVT::i32, GA, Zero);
447 return DAG.getNode(ISD::ADD, MVT::i32, Hi, Lo);
450 // Only lower GlobalAddress on Darwin.
451 if (!getTargetMachine().getSubtarget<PPCSubtarget>().isDarwin()) break;
453 SDOperand Hi = DAG.getNode(PPCISD::Hi, MVT::i32, GA, Zero);
454 if (getTargetMachine().getRelocationModel() == Reloc::PIC) {
455 // With PIC, the first instruction is actually "GR+hi(&G)".
456 Hi = DAG.getNode(ISD::ADD, MVT::i32,
457 DAG.getNode(PPCISD::GlobalBaseReg, MVT::i32), Hi);
460 SDOperand Lo = DAG.getNode(PPCISD::Lo, MVT::i32, GA, Zero);
461 Lo = DAG.getNode(ISD::ADD, MVT::i32, Hi, Lo);
463 if (!GV->hasWeakLinkage() && !GV->hasLinkOnceLinkage() &&
464 (!GV->isExternal() || GV->hasNotBeenReadFromBytecode()))
467 // If the global is weak or external, we have to go through the lazy
469 return DAG.getLoad(MVT::i32, DAG.getEntryNode(), Lo, DAG.getSrcValue(0));
472 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(2))->get();
474 // If we're comparing for equality to zero, expose the fact that this is
475 // implented as a ctlz/srl pair on ppc, so that the dag combiner can
476 // fold the new nodes.
477 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
478 if (C->isNullValue() && CC == ISD::SETEQ) {
479 MVT::ValueType VT = Op.getOperand(0).getValueType();
480 SDOperand Zext = Op.getOperand(0);
483 Zext = DAG.getNode(ISD::ZERO_EXTEND, VT, Op.getOperand(0));
485 unsigned Log2b = Log2_32(MVT::getSizeInBits(VT));
486 SDOperand Clz = DAG.getNode(ISD::CTLZ, VT, Zext);
487 SDOperand Scc = DAG.getNode(ISD::SRL, VT, Clz,
488 DAG.getConstant(Log2b, getShiftAmountTy()));
489 return DAG.getNode(ISD::TRUNCATE, getSetCCResultTy(), Scc);
491 // Leave comparisons against 0 and -1 alone for now, since they're usually
492 // optimized. FIXME: revisit this when we can custom lower all setcc
494 if (C->isAllOnesValue() || C->isNullValue())
498 // If we have an integer seteq/setne, turn it into a compare against zero
499 // by subtracting the rhs from the lhs, which is faster than setting a
500 // condition register, reading it back out, and masking the correct bit.
501 MVT::ValueType LHSVT = Op.getOperand(0).getValueType();
502 if (MVT::isInteger(LHSVT) && (CC == ISD::SETEQ || CC == ISD::SETNE)) {
503 MVT::ValueType VT = Op.getValueType();
504 SDOperand Sub = DAG.getNode(ISD::SUB, LHSVT, Op.getOperand(0),
506 return DAG.getSetCC(VT, Sub, DAG.getConstant(0, LHSVT), CC);
511 // vastart just stores the address of the VarArgsFrameIndex slot into the
512 // memory location argument.
513 // FIXME: Replace MVT::i32 with PointerTy
514 SDOperand FR = DAG.getFrameIndex(VarArgsFrameIndex, MVT::i32);
515 return DAG.getNode(ISD::STORE, MVT::Other, Op.getOperand(0), FR,
516 Op.getOperand(1), Op.getOperand(2));
521 switch(Op.getNumOperands()) {
523 assert(0 && "Do not know how to return this many arguments!");
526 return SDOperand(); // ret void is legal
528 MVT::ValueType ArgVT = Op.getOperand(1).getValueType();
529 unsigned ArgReg = MVT::isInteger(ArgVT) ? PPC::R3 : PPC::F1;
530 Copy = DAG.getCopyToReg(Op.getOperand(0), ArgReg, Op.getOperand(1),
535 Copy = DAG.getCopyToReg(Op.getOperand(0), PPC::R3, Op.getOperand(2),
537 Copy = DAG.getCopyToReg(Copy, PPC::R4, Op.getOperand(1),Copy.getValue(1));
540 return DAG.getNode(PPCISD::RET_FLAG, MVT::Other, Copy, Copy.getValue(1));
546 std::vector<SDOperand>
547 PPCTargetLowering::LowerArguments(Function &F, SelectionDAG &DAG) {
549 // add beautiful description of PPC stack frame format, or at least some docs
551 MachineFunction &MF = DAG.getMachineFunction();
552 MachineFrameInfo *MFI = MF.getFrameInfo();
553 MachineBasicBlock& BB = MF.front();
554 SSARegMap *RegMap = MF.getSSARegMap();
555 std::vector<SDOperand> ArgValues;
557 unsigned ArgOffset = 24;
558 unsigned GPR_remaining = 8;
559 unsigned FPR_remaining = 13;
560 unsigned GPR_idx = 0, FPR_idx = 0;
561 static const unsigned GPR[] = {
562 PPC::R3, PPC::R4, PPC::R5, PPC::R6,
563 PPC::R7, PPC::R8, PPC::R9, PPC::R10,
565 static const unsigned FPR[] = {
566 PPC::F1, PPC::F2, PPC::F3, PPC::F4, PPC::F5, PPC::F6, PPC::F7,
567 PPC::F8, PPC::F9, PPC::F10, PPC::F11, PPC::F12, PPC::F13
570 // Add DAG nodes to load the arguments... On entry to a function on PPC,
571 // the arguments start at offset 24, although they are likely to be passed
573 for (Function::arg_iterator I = F.arg_begin(), E = F.arg_end(); I != E; ++I) {
574 SDOperand newroot, argt;
576 bool needsLoad = false;
577 bool ArgLive = !I->use_empty();
578 MVT::ValueType ObjectVT = getValueType(I->getType());
581 default: assert(0 && "Unhandled argument type!");
588 if (GPR_remaining > 0) {
589 unsigned VReg = RegMap->createVirtualRegister(&PPC::GPRCRegClass);
590 MF.addLiveIn(GPR[GPR_idx], VReg);
591 argt = newroot = DAG.getCopyFromReg(DAG.getRoot(), VReg, MVT::i32);
592 if (ObjectVT != MVT::i32) {
593 unsigned AssertOp = I->getType()->isSigned() ? ISD::AssertSext
595 argt = DAG.getNode(AssertOp, MVT::i32, argt,
596 DAG.getValueType(ObjectVT));
597 argt = DAG.getNode(ISD::TRUNCATE, ObjectVT, argt);
606 if (GPR_remaining > 0) {
607 SDOperand argHi, argLo;
608 unsigned VReg = RegMap->createVirtualRegister(&PPC::GPRCRegClass);
609 MF.addLiveIn(GPR[GPR_idx], VReg);
610 argHi = DAG.getCopyFromReg(DAG.getRoot(), VReg, MVT::i32);
611 // If we have two or more remaining argument registers, then both halves
612 // of the i64 can be sourced from there. Otherwise, the lower half will
613 // have to come off the stack. This can happen when an i64 is preceded
614 // by 28 bytes of arguments.
615 if (GPR_remaining > 1) {
616 unsigned VReg = RegMap->createVirtualRegister(&PPC::GPRCRegClass);
617 MF.addLiveIn(GPR[GPR_idx+1], VReg);
618 argLo = DAG.getCopyFromReg(argHi, VReg, MVT::i32);
620 int FI = MFI->CreateFixedObject(4, ArgOffset+4);
621 SDOperand FIN = DAG.getFrameIndex(FI, MVT::i32);
622 argLo = DAG.getLoad(MVT::i32, DAG.getEntryNode(), FIN,
623 DAG.getSrcValue(NULL));
625 // Build the outgoing arg thingy
626 argt = DAG.getNode(ISD::BUILD_PAIR, MVT::i64, argLo, argHi);
634 ObjSize = (ObjectVT == MVT::f64) ? 8 : 4;
636 if (FPR_remaining > 0) {
642 if (FPR_remaining > 0) {
644 if (ObjectVT == MVT::f32)
645 VReg = RegMap->createVirtualRegister(&PPC::F4RCRegClass);
647 VReg = RegMap->createVirtualRegister(&PPC::F8RCRegClass);
648 MF.addLiveIn(FPR[FPR_idx], VReg);
649 argt = newroot = DAG.getCopyFromReg(DAG.getRoot(), VReg, ObjectVT);
658 // We need to load the argument to a virtual register if we determined above
659 // that we ran out of physical registers of the appropriate type
661 unsigned SubregOffset = 0;
662 if (ObjectVT == MVT::i8 || ObjectVT == MVT::i1) SubregOffset = 3;
663 if (ObjectVT == MVT::i16) SubregOffset = 2;
664 int FI = MFI->CreateFixedObject(ObjSize, ArgOffset);
665 SDOperand FIN = DAG.getFrameIndex(FI, MVT::i32);
666 FIN = DAG.getNode(ISD::ADD, MVT::i32, FIN,
667 DAG.getConstant(SubregOffset, MVT::i32));
668 argt = newroot = DAG.getLoad(ObjectVT, DAG.getEntryNode(), FIN,
669 DAG.getSrcValue(NULL));
672 // Every 4 bytes of argument space consumes one of the GPRs available for
674 if (GPR_remaining > 0) {
675 unsigned delta = (GPR_remaining > 1 && ObjSize == 8) ? 2 : 1;
676 GPR_remaining -= delta;
679 ArgOffset += ObjSize;
681 DAG.setRoot(newroot.getValue(1));
683 ArgValues.push_back(argt);
686 // If the function takes variable number of arguments, make a frame index for
687 // the start of the first vararg value... for expansion of llvm.va_start.
689 VarArgsFrameIndex = MFI->CreateFixedObject(4, ArgOffset);
690 SDOperand FIN = DAG.getFrameIndex(VarArgsFrameIndex, MVT::i32);
691 // If this function is vararg, store any remaining integer argument regs
692 // to their spots on the stack so that they may be loaded by deferencing the
693 // result of va_next.
694 std::vector<SDOperand> MemOps;
695 for (; GPR_remaining > 0; --GPR_remaining, ++GPR_idx) {
696 unsigned VReg = RegMap->createVirtualRegister(&PPC::GPRCRegClass);
697 MF.addLiveIn(GPR[GPR_idx], VReg);
698 SDOperand Val = DAG.getCopyFromReg(DAG.getRoot(), VReg, MVT::i32);
699 SDOperand Store = DAG.getNode(ISD::STORE, MVT::Other, Val.getValue(1),
700 Val, FIN, DAG.getSrcValue(NULL));
701 MemOps.push_back(Store);
702 // Increment the address by four for the next argument to store
703 SDOperand PtrOff = DAG.getConstant(4, getPointerTy());
704 FIN = DAG.getNode(ISD::ADD, MVT::i32, FIN, PtrOff);
706 if (!MemOps.empty()) {
707 MemOps.push_back(DAG.getRoot());
708 DAG.setRoot(DAG.getNode(ISD::TokenFactor, MVT::Other, MemOps));
712 // Finally, inform the code generator which regs we return values in.
713 switch (getValueType(F.getReturnType())) {
714 default: assert(0 && "Unknown type!");
715 case MVT::isVoid: break;
720 MF.addLiveOut(PPC::R3);
723 MF.addLiveOut(PPC::R3);
724 MF.addLiveOut(PPC::R4);
728 MF.addLiveOut(PPC::F1);
735 std::pair<SDOperand, SDOperand>
736 PPCTargetLowering::LowerCallTo(SDOperand Chain,
737 const Type *RetTy, bool isVarArg,
738 unsigned CallingConv, bool isTailCall,
739 SDOperand Callee, ArgListTy &Args,
741 // args_to_use will accumulate outgoing args for the PPCISD::CALL case in
742 // SelectExpr to use to put the arguments in the appropriate registers.
743 std::vector<SDOperand> args_to_use;
745 // Count how many bytes are to be pushed on the stack, including the linkage
746 // area, and parameter passing area.
747 unsigned NumBytes = 24;
750 Chain = DAG.getCALLSEQ_START(Chain,
751 DAG.getConstant(NumBytes, getPointerTy()));
753 for (unsigned i = 0, e = Args.size(); i != e; ++i) {
754 switch (getValueType(Args[i].second)) {
755 default: assert(0 && "Unknown value type!");
770 // Just to be safe, we'll always reserve the full 24 bytes of linkage area
771 // plus 32 bytes of argument space in case any called code gets funky on us.
772 // (Required by ABI to support var arg)
773 if (NumBytes < 56) NumBytes = 56;
775 // Adjust the stack pointer for the new arguments...
776 // These operations are automatically eliminated by the prolog/epilog pass
777 Chain = DAG.getCALLSEQ_START(Chain,
778 DAG.getConstant(NumBytes, getPointerTy()));
780 // Set up a copy of the stack pointer for use loading and storing any
781 // arguments that may not fit in the registers available for argument
783 SDOperand StackPtr = DAG.getRegister(PPC::R1, MVT::i32);
785 // Figure out which arguments are going to go in registers, and which in
786 // memory. Also, if this is a vararg function, floating point operations
787 // must be stored to our stack, and loaded into integer regs as well, if
788 // any integer regs are available for argument passing.
789 unsigned ArgOffset = 24;
790 unsigned GPR_remaining = 8;
791 unsigned FPR_remaining = 13;
793 std::vector<SDOperand> MemOps;
794 for (unsigned i = 0, e = Args.size(); i != e; ++i) {
795 // PtrOff will be used to store the current argument to the stack if a
796 // register cannot be found for it.
797 SDOperand PtrOff = DAG.getConstant(ArgOffset, getPointerTy());
798 PtrOff = DAG.getNode(ISD::ADD, MVT::i32, StackPtr, PtrOff);
799 MVT::ValueType ArgVT = getValueType(Args[i].second);
802 default: assert(0 && "Unexpected ValueType for argument!");
806 // Promote the integer to 32 bits. If the input type is signed use a
807 // sign extend, otherwise use a zero extend.
808 if (Args[i].second->isSigned())
809 Args[i].first =DAG.getNode(ISD::SIGN_EXTEND, MVT::i32, Args[i].first);
811 Args[i].first =DAG.getNode(ISD::ZERO_EXTEND, MVT::i32, Args[i].first);
814 if (GPR_remaining > 0) {
815 args_to_use.push_back(Args[i].first);
818 MemOps.push_back(DAG.getNode(ISD::STORE, MVT::Other, Chain,
819 Args[i].first, PtrOff,
820 DAG.getSrcValue(NULL)));
825 // If we have one free GPR left, we can place the upper half of the i64
826 // in it, and store the other half to the stack. If we have two or more
827 // free GPRs, then we can pass both halves of the i64 in registers.
828 if (GPR_remaining > 0) {
829 SDOperand Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32,
830 Args[i].first, DAG.getConstant(1, MVT::i32));
831 SDOperand Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32,
832 Args[i].first, DAG.getConstant(0, MVT::i32));
833 args_to_use.push_back(Hi);
835 if (GPR_remaining > 0) {
836 args_to_use.push_back(Lo);
839 SDOperand ConstFour = DAG.getConstant(4, getPointerTy());
840 PtrOff = DAG.getNode(ISD::ADD, MVT::i32, PtrOff, ConstFour);
841 MemOps.push_back(DAG.getNode(ISD::STORE, MVT::Other, Chain,
842 Lo, PtrOff, DAG.getSrcValue(NULL)));
845 MemOps.push_back(DAG.getNode(ISD::STORE, MVT::Other, Chain,
846 Args[i].first, PtrOff,
847 DAG.getSrcValue(NULL)));
853 if (FPR_remaining > 0) {
854 args_to_use.push_back(Args[i].first);
857 SDOperand Store = DAG.getNode(ISD::STORE, MVT::Other, Chain,
858 Args[i].first, PtrOff,
859 DAG.getSrcValue(NULL));
860 MemOps.push_back(Store);
861 // Float varargs are always shadowed in available integer registers
862 if (GPR_remaining > 0) {
863 SDOperand Load = DAG.getLoad(MVT::i32, Store, PtrOff,
864 DAG.getSrcValue(NULL));
865 MemOps.push_back(Load.getValue(1));
866 args_to_use.push_back(Load);
869 if (GPR_remaining > 0 && MVT::f64 == ArgVT) {
870 SDOperand ConstFour = DAG.getConstant(4, getPointerTy());
871 PtrOff = DAG.getNode(ISD::ADD, MVT::i32, PtrOff, ConstFour);
872 SDOperand Load = DAG.getLoad(MVT::i32, Store, PtrOff,
873 DAG.getSrcValue(NULL));
874 MemOps.push_back(Load.getValue(1));
875 args_to_use.push_back(Load);
879 // If we have any FPRs remaining, we may also have GPRs remaining.
880 // Args passed in FPRs consume either 1 (f32) or 2 (f64) available
882 if (GPR_remaining > 0) {
883 args_to_use.push_back(DAG.getNode(ISD::UNDEF, MVT::i32));
886 if (GPR_remaining > 0 && MVT::f64 == ArgVT) {
887 args_to_use.push_back(DAG.getNode(ISD::UNDEF, MVT::i32));
892 MemOps.push_back(DAG.getNode(ISD::STORE, MVT::Other, Chain,
893 Args[i].first, PtrOff,
894 DAG.getSrcValue(NULL)));
896 ArgOffset += (ArgVT == MVT::f32) ? 4 : 8;
901 Chain = DAG.getNode(ISD::TokenFactor, MVT::Other, MemOps);
904 std::vector<MVT::ValueType> RetVals;
905 MVT::ValueType RetTyVT = getValueType(RetTy);
906 MVT::ValueType ActualRetTyVT = RetTyVT;
907 if (RetTyVT >= MVT::i1 && RetTyVT <= MVT::i16)
908 ActualRetTyVT = MVT::i32; // Promote result to i32.
910 if (RetTyVT == MVT::i64) {
911 RetVals.push_back(MVT::i32);
912 RetVals.push_back(MVT::i32);
913 } else if (RetTyVT != MVT::isVoid) {
914 RetVals.push_back(ActualRetTyVT);
916 RetVals.push_back(MVT::Other);
918 // If the callee is a GlobalAddress node (quite common, every direct call is)
919 // turn it into a TargetGlobalAddress node so that legalize doesn't hack it.
920 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
921 Callee = DAG.getTargetGlobalAddress(G->getGlobal(), MVT::i32);
923 std::vector<SDOperand> Ops;
924 Ops.push_back(Chain);
925 Ops.push_back(Callee);
926 Ops.insert(Ops.end(), args_to_use.begin(), args_to_use.end());
927 SDOperand TheCall = DAG.getNode(PPCISD::CALL, RetVals, Ops);
928 Chain = TheCall.getValue(TheCall.Val->getNumValues()-1);
929 Chain = DAG.getNode(ISD::CALLSEQ_END, MVT::Other, Chain,
930 DAG.getConstant(NumBytes, getPointerTy()));
931 SDOperand RetVal = TheCall;
933 // If the result is a small value, add a note so that we keep track of the
934 // information about whether it is sign or zero extended.
935 if (RetTyVT != ActualRetTyVT) {
936 RetVal = DAG.getNode(RetTy->isSigned() ? ISD::AssertSext : ISD::AssertZext,
937 MVT::i32, RetVal, DAG.getValueType(RetTyVT));
938 RetVal = DAG.getNode(ISD::TRUNCATE, RetTyVT, RetVal);
939 } else if (RetTyVT == MVT::i64) {
940 RetVal = DAG.getNode(ISD::BUILD_PAIR, MVT::i64, RetVal, RetVal.getValue(1));
943 return std::make_pair(RetVal, Chain);
947 PPCTargetLowering::InsertAtEndOfBasicBlock(MachineInstr *MI,
948 MachineBasicBlock *BB) {
949 assert((MI->getOpcode() == PPC::SELECT_CC_Int ||
950 MI->getOpcode() == PPC::SELECT_CC_F4 ||
951 MI->getOpcode() == PPC::SELECT_CC_F8) &&
952 "Unexpected instr type to insert");
954 // To "insert" a SELECT_CC instruction, we actually have to insert the diamond
955 // control-flow pattern. The incoming instruction knows the destination vreg
956 // to set, the condition code register to branch on, the true/false values to
957 // select between, and a branch opcode to use.
958 const BasicBlock *LLVM_BB = BB->getBasicBlock();
959 ilist<MachineBasicBlock>::iterator It = BB;
967 // fallthrough --> copy0MBB
968 MachineBasicBlock *thisMBB = BB;
969 MachineBasicBlock *copy0MBB = new MachineBasicBlock(LLVM_BB);
970 MachineBasicBlock *sinkMBB = new MachineBasicBlock(LLVM_BB);
971 BuildMI(BB, MI->getOperand(4).getImmedValue(), 2)
972 .addReg(MI->getOperand(1).getReg()).addMBB(sinkMBB);
973 MachineFunction *F = BB->getParent();
974 F->getBasicBlockList().insert(It, copy0MBB);
975 F->getBasicBlockList().insert(It, sinkMBB);
976 // Update machine-CFG edges
977 BB->addSuccessor(copy0MBB);
978 BB->addSuccessor(sinkMBB);
982 // # fallthrough to sinkMBB
985 // Update machine-CFG edges
986 BB->addSuccessor(sinkMBB);
989 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
992 BuildMI(BB, PPC::PHI, 4, MI->getOperand(0).getReg())
993 .addReg(MI->getOperand(3).getReg()).addMBB(copy0MBB)
994 .addReg(MI->getOperand(2).getReg()).addMBB(thisMBB);
996 delete MI; // The pseudo instruction is gone now.
1000 /// getConstraintType - Given a constraint letter, return the type of
1001 /// constraint it is for this target.
1002 PPCTargetLowering::ConstraintType
1003 PPCTargetLowering::getConstraintType(char ConstraintLetter) const {
1004 switch (ConstraintLetter) {
1011 return C_RegisterClass;
1013 return TargetLowering::getConstraintType(ConstraintLetter);
1017 std::vector<unsigned> PPCTargetLowering::
1018 getRegClassForInlineAsmConstraint(const std::string &Constraint,
1019 MVT::ValueType VT) const {
1020 if (Constraint.size() == 1) {
1021 switch (Constraint[0]) { // GCC RS6000 Constraint Letters
1022 default: break; // Unknown constriant letter
1024 return make_vector<unsigned>(/*no R0*/ PPC::R1 , PPC::R2 , PPC::R3 ,
1025 PPC::R4 , PPC::R5 , PPC::R6 , PPC::R7 ,
1026 PPC::R8 , PPC::R9 , PPC::R10, PPC::R11,
1027 PPC::R12, PPC::R13, PPC::R14, PPC::R15,
1028 PPC::R16, PPC::R17, PPC::R18, PPC::R19,
1029 PPC::R20, PPC::R21, PPC::R22, PPC::R23,
1030 PPC::R24, PPC::R25, PPC::R26, PPC::R27,
1031 PPC::R28, PPC::R29, PPC::R30, PPC::R31,
1034 return make_vector<unsigned>(PPC::R0 , PPC::R1 , PPC::R2 , PPC::R3 ,
1035 PPC::R4 , PPC::R5 , PPC::R6 , PPC::R7 ,
1036 PPC::R8 , PPC::R9 , PPC::R10, PPC::R11,
1037 PPC::R12, PPC::R13, PPC::R14, PPC::R15,
1038 PPC::R16, PPC::R17, PPC::R18, PPC::R19,
1039 PPC::R20, PPC::R21, PPC::R22, PPC::R23,
1040 PPC::R24, PPC::R25, PPC::R26, PPC::R27,
1041 PPC::R28, PPC::R29, PPC::R30, PPC::R31,
1044 return make_vector<unsigned>(PPC::F0 , PPC::F1 , PPC::F2 , PPC::F3 ,
1045 PPC::F4 , PPC::F5 , PPC::F6 , PPC::F7 ,
1046 PPC::F8 , PPC::F9 , PPC::F10, PPC::F11,
1047 PPC::F12, PPC::F13, PPC::F14, PPC::F15,
1048 PPC::F16, PPC::F17, PPC::F18, PPC::F19,
1049 PPC::F20, PPC::F21, PPC::F22, PPC::F23,
1050 PPC::F24, PPC::F25, PPC::F26, PPC::F27,
1051 PPC::F28, PPC::F29, PPC::F30, PPC::F31,
1054 return make_vector<unsigned>(PPC::V0 , PPC::V1 , PPC::V2 , PPC::V3 ,
1055 PPC::V4 , PPC::V5 , PPC::V6 , PPC::V7 ,
1056 PPC::V8 , PPC::V9 , PPC::V10, PPC::V11,
1057 PPC::V12, PPC::V13, PPC::V14, PPC::V15,
1058 PPC::V16, PPC::V17, PPC::V18, PPC::V19,
1059 PPC::V20, PPC::V21, PPC::V22, PPC::V23,
1060 PPC::V24, PPC::V25, PPC::V26, PPC::V27,
1061 PPC::V28, PPC::V29, PPC::V30, PPC::V31,
1064 return make_vector<unsigned>(PPC::CR0, PPC::CR1, PPC::CR2, PPC::CR3,
1065 PPC::CR4, PPC::CR5, PPC::CR6, PPC::CR7,
1070 return std::vector<unsigned>();
1073 // isOperandValidForConstraint
1074 bool PPCTargetLowering::
1075 isOperandValidForConstraint(SDOperand Op, char Letter) {
1086 if (!isa<ConstantSDNode>(Op)) return false; // Must be an immediate.
1087 unsigned Value = cast<ConstantSDNode>(Op)->getValue();
1089 default: assert(0 && "Unknown constraint letter!");
1090 case 'I': // "I" is a signed 16-bit constant.
1091 return (short)Value == (int)Value;
1092 case 'J': // "J" is a constant with only the high-order 16 bits nonzero.
1093 case 'L': // "L" is a signed 16-bit constant shifted left 16 bits.
1094 return (short)Value == 0;
1095 case 'K': // "K" is a constant with only the low-order 16 bits nonzero.
1096 return (Value >> 16) == 0;
1097 case 'M': // "M" is a constant that is greater than 31.
1099 case 'N': // "N" is a positive constant that is an exact power of two.
1100 return (int)Value > 0 && isPowerOf2_32(Value);
1101 case 'O': // "O" is the constant zero.
1103 case 'P': // "P" is a constant whose negation is a signed 16-bit constant.
1104 return (short)-Value == (int)-Value;
1110 // Handle standard constraint letters.
1111 return TargetLowering::isOperandValidForConstraint(Op, Letter);