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/Instruction.h"
26 #include "llvm/Intrinsics.h"
27 #include "llvm/GlobalValue.h"
28 #include "llvm/CodeGen/MachineBasicBlock.h"
29 #include "llvm/CodeGen/MachineFrameInfo.h"
30 #include "llvm/CodeGen/MachineFunction.h"
31 #include "llvm/CodeGen/MachineInstrBuilder.h"
32 #include "llvm/CodeGen/MachineRegisterInfo.h"
33 #include "llvm/CodeGen/SelectionDAG.h"
34 #include "llvm/Target/TargetOptions.h"
35 #include "llvm/ADT/VectorExtras.h"
36 #include "llvm/Support/MathExtras.h"
39 ARMTargetLowering::ARMTargetLowering(TargetMachine &TM)
40 : TargetLowering(TM), ARMPCLabelIndex(0) {
41 Subtarget = &TM.getSubtarget<ARMSubtarget>();
43 if (Subtarget->isTargetDarwin()) {
44 // Uses VFP for Thumb libfuncs if available.
45 if (Subtarget->isThumb() && Subtarget->hasVFP2()) {
46 // Single-precision floating-point arithmetic.
47 setLibcallName(RTLIB::ADD_F32, "__addsf3vfp");
48 setLibcallName(RTLIB::SUB_F32, "__subsf3vfp");
49 setLibcallName(RTLIB::MUL_F32, "__mulsf3vfp");
50 setLibcallName(RTLIB::DIV_F32, "__divsf3vfp");
52 // Double-precision floating-point arithmetic.
53 setLibcallName(RTLIB::ADD_F64, "__adddf3vfp");
54 setLibcallName(RTLIB::SUB_F64, "__subdf3vfp");
55 setLibcallName(RTLIB::MUL_F64, "__muldf3vfp");
56 setLibcallName(RTLIB::DIV_F64, "__divdf3vfp");
58 // Single-precision comparisons.
59 setLibcallName(RTLIB::OEQ_F32, "__eqsf2vfp");
60 setLibcallName(RTLIB::UNE_F32, "__nesf2vfp");
61 setLibcallName(RTLIB::OLT_F32, "__ltsf2vfp");
62 setLibcallName(RTLIB::OLE_F32, "__lesf2vfp");
63 setLibcallName(RTLIB::OGE_F32, "__gesf2vfp");
64 setLibcallName(RTLIB::OGT_F32, "__gtsf2vfp");
65 setLibcallName(RTLIB::UO_F32, "__unordsf2vfp");
66 setLibcallName(RTLIB::O_F32, "__unordsf2vfp");
68 setCmpLibcallCC(RTLIB::OEQ_F32, ISD::SETNE);
69 setCmpLibcallCC(RTLIB::UNE_F32, ISD::SETNE);
70 setCmpLibcallCC(RTLIB::OLT_F32, ISD::SETNE);
71 setCmpLibcallCC(RTLIB::OLE_F32, ISD::SETNE);
72 setCmpLibcallCC(RTLIB::OGE_F32, ISD::SETNE);
73 setCmpLibcallCC(RTLIB::OGT_F32, ISD::SETNE);
74 setCmpLibcallCC(RTLIB::UO_F32, ISD::SETNE);
75 setCmpLibcallCC(RTLIB::O_F32, ISD::SETEQ);
77 // Double-precision comparisons.
78 setLibcallName(RTLIB::OEQ_F64, "__eqdf2vfp");
79 setLibcallName(RTLIB::UNE_F64, "__nedf2vfp");
80 setLibcallName(RTLIB::OLT_F64, "__ltdf2vfp");
81 setLibcallName(RTLIB::OLE_F64, "__ledf2vfp");
82 setLibcallName(RTLIB::OGE_F64, "__gedf2vfp");
83 setLibcallName(RTLIB::OGT_F64, "__gtdf2vfp");
84 setLibcallName(RTLIB::UO_F64, "__unorddf2vfp");
85 setLibcallName(RTLIB::O_F64, "__unorddf2vfp");
87 setCmpLibcallCC(RTLIB::OEQ_F64, ISD::SETNE);
88 setCmpLibcallCC(RTLIB::UNE_F64, ISD::SETNE);
89 setCmpLibcallCC(RTLIB::OLT_F64, ISD::SETNE);
90 setCmpLibcallCC(RTLIB::OLE_F64, ISD::SETNE);
91 setCmpLibcallCC(RTLIB::OGE_F64, ISD::SETNE);
92 setCmpLibcallCC(RTLIB::OGT_F64, ISD::SETNE);
93 setCmpLibcallCC(RTLIB::UO_F64, ISD::SETNE);
94 setCmpLibcallCC(RTLIB::O_F64, ISD::SETEQ);
96 // Floating-point to integer conversions.
97 // i64 conversions are done via library routines even when generating VFP
98 // instructions, so use the same ones.
99 setLibcallName(RTLIB::FPTOSINT_F64_I32, "__fixdfsivfp");
100 setLibcallName(RTLIB::FPTOUINT_F64_I32, "__fixunsdfsivfp");
101 setLibcallName(RTLIB::FPTOSINT_F32_I32, "__fixsfsivfp");
102 setLibcallName(RTLIB::FPTOUINT_F32_I32, "__fixunssfsivfp");
104 // Conversions between floating types.
105 setLibcallName(RTLIB::FPROUND_F64_F32, "__truncdfsf2vfp");
106 setLibcallName(RTLIB::FPEXT_F32_F64, "__extendsfdf2vfp");
108 // Integer to floating-point conversions.
109 // i64 conversions are done via library routines even when generating VFP
110 // instructions, so use the same ones.
111 // FIXME: There appears to be some naming inconsistency in ARM libgcc:
112 // e.g., __floatunsidf vs. __floatunssidfvfp.
113 setLibcallName(RTLIB::SINTTOFP_I32_F64, "__floatsidfvfp");
114 setLibcallName(RTLIB::UINTTOFP_I32_F64, "__floatunssidfvfp");
115 setLibcallName(RTLIB::SINTTOFP_I32_F32, "__floatsisfvfp");
116 setLibcallName(RTLIB::UINTTOFP_I32_F32, "__floatunssisfvfp");
120 if (Subtarget->isThumb())
121 addRegisterClass(MVT::i32, ARM::tGPRRegisterClass);
123 addRegisterClass(MVT::i32, ARM::GPRRegisterClass);
124 if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb()) {
125 addRegisterClass(MVT::f32, ARM::SPRRegisterClass);
126 addRegisterClass(MVT::f64, ARM::DPRRegisterClass);
128 setTruncStoreAction(MVT::f64, MVT::f32, Expand);
130 computeRegisterProperties();
132 // ARM does not have f32 extending load.
133 setLoadExtAction(ISD::EXTLOAD, MVT::f32, Expand);
135 // ARM does not have i1 sign extending load.
136 setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Promote);
138 // ARM supports all 4 flavors of integer indexed load / store.
139 for (unsigned im = (unsigned)ISD::PRE_INC;
140 im != (unsigned)ISD::LAST_INDEXED_MODE; ++im) {
141 setIndexedLoadAction(im, MVT::i1, Legal);
142 setIndexedLoadAction(im, MVT::i8, Legal);
143 setIndexedLoadAction(im, MVT::i16, Legal);
144 setIndexedLoadAction(im, MVT::i32, Legal);
145 setIndexedStoreAction(im, MVT::i1, Legal);
146 setIndexedStoreAction(im, MVT::i8, Legal);
147 setIndexedStoreAction(im, MVT::i16, Legal);
148 setIndexedStoreAction(im, MVT::i32, Legal);
151 // i64 operation support.
152 if (Subtarget->isThumb()) {
153 setOperationAction(ISD::MUL, MVT::i64, Expand);
154 setOperationAction(ISD::MULHU, MVT::i32, Expand);
155 setOperationAction(ISD::MULHS, MVT::i32, Expand);
156 setOperationAction(ISD::UMUL_LOHI, MVT::i32, Expand);
157 setOperationAction(ISD::SMUL_LOHI, MVT::i32, Expand);
159 setOperationAction(ISD::MUL, MVT::i64, Expand);
160 setOperationAction(ISD::MULHU, MVT::i32, Expand);
161 if (!Subtarget->hasV6Ops())
162 setOperationAction(ISD::MULHS, MVT::i32, Expand);
164 setOperationAction(ISD::SHL_PARTS, MVT::i32, Expand);
165 setOperationAction(ISD::SRA_PARTS, MVT::i32, Expand);
166 setOperationAction(ISD::SRL_PARTS, MVT::i32, Expand);
167 setOperationAction(ISD::SRL, MVT::i64, Custom);
168 setOperationAction(ISD::SRA, MVT::i64, Custom);
170 // ARM does not have ROTL.
171 setOperationAction(ISD::ROTL, MVT::i32, Expand);
172 setOperationAction(ISD::CTTZ, MVT::i32, Expand);
173 setOperationAction(ISD::CTPOP, MVT::i32, Expand);
174 if (!Subtarget->hasV5TOps() || Subtarget->isThumb())
175 setOperationAction(ISD::CTLZ, MVT::i32, Expand);
177 // Only ARMv6 has BSWAP.
178 if (!Subtarget->hasV6Ops())
179 setOperationAction(ISD::BSWAP, MVT::i32, Expand);
181 // These are expanded into libcalls.
182 setOperationAction(ISD::SDIV, MVT::i32, Expand);
183 setOperationAction(ISD::UDIV, MVT::i32, Expand);
184 setOperationAction(ISD::SREM, MVT::i32, Expand);
185 setOperationAction(ISD::UREM, MVT::i32, Expand);
186 setOperationAction(ISD::SDIVREM, MVT::i32, Expand);
187 setOperationAction(ISD::UDIVREM, MVT::i32, Expand);
189 // Support label based line numbers.
190 setOperationAction(ISD::DBG_STOPPOINT, MVT::Other, Expand);
191 setOperationAction(ISD::DEBUG_LOC, MVT::Other, Expand);
193 setOperationAction(ISD::RET, MVT::Other, Custom);
194 setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
195 setOperationAction(ISD::ConstantPool, MVT::i32, Custom);
196 setOperationAction(ISD::GLOBAL_OFFSET_TABLE, MVT::i32, Custom);
197 setOperationAction(ISD::GlobalTLSAddress, MVT::i32, Custom);
199 // Use the default implementation.
200 setOperationAction(ISD::VASTART, MVT::Other, Custom);
201 setOperationAction(ISD::VAARG, MVT::Other, Expand);
202 setOperationAction(ISD::VACOPY, MVT::Other, Expand);
203 setOperationAction(ISD::VAEND, MVT::Other, Expand);
204 setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
205 setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
206 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32, Expand);
207 setOperationAction(ISD::MEMBARRIER, MVT::Other, Expand);
209 if (!Subtarget->hasV6Ops()) {
210 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i16, Expand);
211 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i8, Expand);
213 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
215 if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb())
216 // Turn f64->i64 into FMRRD, i64 -> f64 to FMDRR iff target supports vfp2.
217 setOperationAction(ISD::BIT_CONVERT, MVT::i64, Custom);
219 // We want to custom lower some of our intrinsics.
220 setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom);
222 setOperationAction(ISD::SETCC, MVT::i32, Expand);
223 setOperationAction(ISD::SETCC, MVT::f32, Expand);
224 setOperationAction(ISD::SETCC, MVT::f64, Expand);
225 setOperationAction(ISD::SELECT, MVT::i32, Expand);
226 setOperationAction(ISD::SELECT, MVT::f32, Expand);
227 setOperationAction(ISD::SELECT, MVT::f64, Expand);
228 setOperationAction(ISD::SELECT_CC, MVT::i32, Custom);
229 setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
230 setOperationAction(ISD::SELECT_CC, MVT::f64, Custom);
232 setOperationAction(ISD::BRCOND, MVT::Other, Expand);
233 setOperationAction(ISD::BR_CC, MVT::i32, Custom);
234 setOperationAction(ISD::BR_CC, MVT::f32, Custom);
235 setOperationAction(ISD::BR_CC, MVT::f64, Custom);
236 setOperationAction(ISD::BR_JT, MVT::Other, Custom);
238 // We don't support sin/cos/fmod/copysign/pow
239 setOperationAction(ISD::FSIN, MVT::f64, Expand);
240 setOperationAction(ISD::FSIN, MVT::f32, Expand);
241 setOperationAction(ISD::FCOS, MVT::f32, Expand);
242 setOperationAction(ISD::FCOS, MVT::f64, Expand);
243 setOperationAction(ISD::FREM, MVT::f64, Expand);
244 setOperationAction(ISD::FREM, MVT::f32, Expand);
245 if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb()) {
246 setOperationAction(ISD::FCOPYSIGN, MVT::f64, Custom);
247 setOperationAction(ISD::FCOPYSIGN, MVT::f32, Custom);
249 setOperationAction(ISD::FPOW, MVT::f64, Expand);
250 setOperationAction(ISD::FPOW, MVT::f32, Expand);
252 // int <-> fp are custom expanded into bit_convert + ARMISD ops.
253 if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb()) {
254 setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom);
255 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Custom);
256 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Custom);
257 setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom);
260 // We have target-specific dag combine patterns for the following nodes:
261 // ARMISD::FMRRD - No need to call setTargetDAGCombine
262 setTargetDAGCombine(ISD::ADD);
263 setTargetDAGCombine(ISD::SUB);
265 setStackPointerRegisterToSaveRestore(ARM::SP);
266 setSchedulingPreference(SchedulingForRegPressure);
267 setIfCvtBlockSizeLimit(Subtarget->isThumb() ? 0 : 10);
268 setIfCvtDupBlockSizeLimit(Subtarget->isThumb() ? 0 : 2);
270 maxStoresPerMemcpy = 1; //// temporary - rewrite interface to use type
273 const char *ARMTargetLowering::getTargetNodeName(unsigned Opcode) const {
276 case ARMISD::Wrapper: return "ARMISD::Wrapper";
277 case ARMISD::WrapperJT: return "ARMISD::WrapperJT";
278 case ARMISD::CALL: return "ARMISD::CALL";
279 case ARMISD::CALL_PRED: return "ARMISD::CALL_PRED";
280 case ARMISD::CALL_NOLINK: return "ARMISD::CALL_NOLINK";
281 case ARMISD::tCALL: return "ARMISD::tCALL";
282 case ARMISD::BRCOND: return "ARMISD::BRCOND";
283 case ARMISD::BR_JT: return "ARMISD::BR_JT";
284 case ARMISD::RET_FLAG: return "ARMISD::RET_FLAG";
285 case ARMISD::PIC_ADD: return "ARMISD::PIC_ADD";
286 case ARMISD::CMP: return "ARMISD::CMP";
287 case ARMISD::CMPNZ: return "ARMISD::CMPNZ";
288 case ARMISD::CMPFP: return "ARMISD::CMPFP";
289 case ARMISD::CMPFPw0: return "ARMISD::CMPFPw0";
290 case ARMISD::FMSTAT: return "ARMISD::FMSTAT";
291 case ARMISD::CMOV: return "ARMISD::CMOV";
292 case ARMISD::CNEG: return "ARMISD::CNEG";
294 case ARMISD::FTOSI: return "ARMISD::FTOSI";
295 case ARMISD::FTOUI: return "ARMISD::FTOUI";
296 case ARMISD::SITOF: return "ARMISD::SITOF";
297 case ARMISD::UITOF: return "ARMISD::UITOF";
299 case ARMISD::SRL_FLAG: return "ARMISD::SRL_FLAG";
300 case ARMISD::SRA_FLAG: return "ARMISD::SRA_FLAG";
301 case ARMISD::RRX: return "ARMISD::RRX";
303 case ARMISD::FMRRD: return "ARMISD::FMRRD";
304 case ARMISD::FMDRR: return "ARMISD::FMDRR";
306 case ARMISD::THREAD_POINTER:return "ARMISD::THREAD_POINTER";
310 //===----------------------------------------------------------------------===//
312 //===----------------------------------------------------------------------===//
314 /// IntCCToARMCC - Convert a DAG integer condition code to an ARM CC
315 static ARMCC::CondCodes IntCCToARMCC(ISD::CondCode CC) {
317 default: assert(0 && "Unknown condition code!");
318 case ISD::SETNE: return ARMCC::NE;
319 case ISD::SETEQ: return ARMCC::EQ;
320 case ISD::SETGT: return ARMCC::GT;
321 case ISD::SETGE: return ARMCC::GE;
322 case ISD::SETLT: return ARMCC::LT;
323 case ISD::SETLE: return ARMCC::LE;
324 case ISD::SETUGT: return ARMCC::HI;
325 case ISD::SETUGE: return ARMCC::HS;
326 case ISD::SETULT: return ARMCC::LO;
327 case ISD::SETULE: return ARMCC::LS;
331 /// FPCCToARMCC - Convert a DAG fp condition code to an ARM CC. It
332 /// returns true if the operands should be inverted to form the proper
334 static bool FPCCToARMCC(ISD::CondCode CC, ARMCC::CondCodes &CondCode,
335 ARMCC::CondCodes &CondCode2) {
337 CondCode2 = ARMCC::AL;
339 default: assert(0 && "Unknown FP condition!");
341 case ISD::SETOEQ: CondCode = ARMCC::EQ; break;
343 case ISD::SETOGT: CondCode = ARMCC::GT; break;
345 case ISD::SETOGE: CondCode = ARMCC::GE; break;
346 case ISD::SETOLT: CondCode = ARMCC::MI; break;
347 case ISD::SETOLE: CondCode = ARMCC::GT; Invert = true; break;
348 case ISD::SETONE: CondCode = ARMCC::MI; CondCode2 = ARMCC::GT; break;
349 case ISD::SETO: CondCode = ARMCC::VC; break;
350 case ISD::SETUO: CondCode = ARMCC::VS; break;
351 case ISD::SETUEQ: CondCode = ARMCC::EQ; CondCode2 = ARMCC::VS; break;
352 case ISD::SETUGT: CondCode = ARMCC::HI; break;
353 case ISD::SETUGE: CondCode = ARMCC::PL; break;
355 case ISD::SETULT: CondCode = ARMCC::LT; break;
357 case ISD::SETULE: CondCode = ARMCC::LE; break;
359 case ISD::SETUNE: CondCode = ARMCC::NE; break;
365 HowToPassArgument(MVT ObjectVT, unsigned NumGPRs,
366 unsigned StackOffset, unsigned &NeededGPRs,
367 unsigned &NeededStackSize, unsigned &GPRPad,
368 unsigned &StackPad, ISD::ArgFlagsTy Flags) {
373 unsigned align = Flags.getOrigAlign();
374 GPRPad = NumGPRs % ((align + 3)/4);
375 StackPad = StackOffset % align;
376 unsigned firstGPR = NumGPRs + GPRPad;
377 switch (ObjectVT.getSimpleVT()) {
378 default: assert(0 && "Unhandled argument type!");
390 else if (firstGPR == 3) {
398 /// LowerCALL - Lowering a ISD::CALL node into a callseq_start <-
399 /// ARMISD:CALL <- callseq_end chain. Also add input and output parameter
401 SDValue ARMTargetLowering::LowerCALL(SDValue Op, SelectionDAG &DAG) {
402 CallSDNode *TheCall = cast<CallSDNode>(Op.getNode());
403 MVT RetVT = TheCall->getRetValType(0);
404 SDValue Chain = TheCall->getChain();
405 assert((TheCall->getCallingConv() == CallingConv::C ||
406 TheCall->getCallingConv() == CallingConv::Fast) &&
407 "unknown calling convention");
408 SDValue Callee = TheCall->getCallee();
409 unsigned NumOps = TheCall->getNumArgs();
410 DebugLoc dl = TheCall->getDebugLoc();
411 unsigned ArgOffset = 0; // Frame mechanisms handle retaddr slot
412 unsigned NumGPRs = 0; // GPRs used for parameter passing.
414 // Count how many bytes are to be pushed on the stack.
415 unsigned NumBytes = 0;
417 // Add up all the space actually used.
418 for (unsigned i = 0; i < NumOps; ++i) {
423 MVT ObjectVT = TheCall->getArg(i).getValueType();
424 ISD::ArgFlagsTy Flags = TheCall->getArgFlags(i);
425 HowToPassArgument(ObjectVT, NumGPRs, NumBytes, ObjGPRs, ObjSize,
426 GPRPad, StackPad, Flags);
427 NumBytes += ObjSize + StackPad;
428 NumGPRs += ObjGPRs + GPRPad;
431 // Adjust the stack pointer for the new arguments...
432 // These operations are automatically eliminated by the prolog/epilog pass
433 Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(NumBytes, true));
435 SDValue StackPtr = DAG.getRegister(ARM::SP, MVT::i32);
437 static const unsigned GPRArgRegs[] = {
438 ARM::R0, ARM::R1, ARM::R2, ARM::R3
442 std::vector<std::pair<unsigned, SDValue> > RegsToPass;
443 std::vector<SDValue> MemOpChains;
444 for (unsigned i = 0; i != NumOps; ++i) {
445 SDValue Arg = TheCall->getArg(i);
446 ISD::ArgFlagsTy Flags = TheCall->getArgFlags(i);
447 MVT ArgVT = Arg.getValueType();
453 HowToPassArgument(ArgVT, NumGPRs, ArgOffset, ObjGPRs,
454 ObjSize, GPRPad, StackPad, Flags);
456 ArgOffset += StackPad;
458 switch (ArgVT.getSimpleVT()) {
459 default: assert(0 && "Unexpected ValueType for argument!");
461 RegsToPass.push_back(std::make_pair(GPRArgRegs[NumGPRs], Arg));
464 RegsToPass.push_back(std::make_pair(GPRArgRegs[NumGPRs],
465 DAG.getNode(ISD::BIT_CONVERT, dl, MVT::i32, Arg)));
468 SDValue Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, Arg,
469 DAG.getConstant(0, getPointerTy()));
470 SDValue Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, Arg,
471 DAG.getConstant(1, getPointerTy()));
472 RegsToPass.push_back(std::make_pair(GPRArgRegs[NumGPRs], Lo));
474 RegsToPass.push_back(std::make_pair(GPRArgRegs[NumGPRs+1], Hi));
476 SDValue PtrOff= DAG.getConstant(ArgOffset, StackPtr.getValueType());
477 PtrOff = DAG.getNode(ISD::ADD, dl, MVT::i32, StackPtr, PtrOff);
478 MemOpChains.push_back(DAG.getStore(Chain, dl, Hi, PtrOff, NULL, 0));
483 SDValue Cvt = DAG.getNode(ARMISD::FMRRD, dl,
484 DAG.getVTList(MVT::i32, MVT::i32),
486 RegsToPass.push_back(std::make_pair(GPRArgRegs[NumGPRs], Cvt));
488 RegsToPass.push_back(std::make_pair(GPRArgRegs[NumGPRs+1],
491 SDValue PtrOff= DAG.getConstant(ArgOffset, StackPtr.getValueType());
492 PtrOff = DAG.getNode(ISD::ADD, dl, MVT::i32, StackPtr, PtrOff);
493 MemOpChains.push_back(DAG.getStore(Chain, dl, Cvt.getValue(1), PtrOff,
500 assert(ObjSize != 0);
501 SDValue PtrOff = DAG.getConstant(ArgOffset, StackPtr.getValueType());
502 PtrOff = DAG.getNode(ISD::ADD, dl, MVT::i32, StackPtr, PtrOff);
503 MemOpChains.push_back(DAG.getStore(Chain, dl, Arg, PtrOff, NULL, 0));
507 ArgOffset += ObjSize;
510 if (!MemOpChains.empty())
511 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
512 &MemOpChains[0], MemOpChains.size());
514 // Build a sequence of copy-to-reg nodes chained together with token chain
515 // and flag operands which copy the outgoing args into the appropriate regs.
517 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
518 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
519 RegsToPass[i].second, InFlag);
520 InFlag = Chain.getValue(1);
523 // If the callee is a GlobalAddress/ExternalSymbol node (quite common, every
524 // direct call is) turn it into a TargetGlobalAddress/TargetExternalSymbol
525 // node so that legalize doesn't hack it.
526 bool isDirect = false;
527 bool isARMFunc = false;
528 bool isLocalARMFunc = false;
529 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
530 GlobalValue *GV = G->getGlobal();
532 bool isExt = (GV->isDeclaration() || GV->hasWeakLinkage() ||
533 GV->hasLinkOnceLinkage());
534 bool isStub = (isExt && Subtarget->isTargetDarwin()) &&
535 getTargetMachine().getRelocationModel() != Reloc::Static;
536 isARMFunc = !Subtarget->isThumb() || isStub;
537 // ARM call to a local ARM function is predicable.
538 isLocalARMFunc = !Subtarget->isThumb() && !isExt;
539 // tBX takes a register source operand.
540 if (isARMFunc && Subtarget->isThumb() && !Subtarget->hasV5TOps()) {
541 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(GV, ARMPCLabelIndex,
543 SDValue CPAddr = DAG.getTargetConstantPool(CPV, getPointerTy(), 4);
544 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
545 Callee = DAG.getLoad(getPointerTy(), dl,
546 DAG.getEntryNode(), CPAddr, NULL, 0);
547 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
548 Callee = DAG.getNode(ARMISD::PIC_ADD, dl,
549 getPointerTy(), Callee, PICLabel);
551 Callee = DAG.getTargetGlobalAddress(GV, getPointerTy());
552 } else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee)) {
554 bool isStub = Subtarget->isTargetDarwin() &&
555 getTargetMachine().getRelocationModel() != Reloc::Static;
556 isARMFunc = !Subtarget->isThumb() || isStub;
557 // tBX takes a register source operand.
558 const char *Sym = S->getSymbol();
559 if (isARMFunc && Subtarget->isThumb() && !Subtarget->hasV5TOps()) {
560 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(Sym, ARMPCLabelIndex,
562 SDValue CPAddr = DAG.getTargetConstantPool(CPV, getPointerTy(), 4);
563 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
564 Callee = DAG.getLoad(getPointerTy(), dl,
565 DAG.getEntryNode(), CPAddr, NULL, 0);
566 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
567 Callee = DAG.getNode(ARMISD::PIC_ADD, dl,
568 getPointerTy(), Callee, PICLabel);
570 Callee = DAG.getTargetExternalSymbol(Sym, getPointerTy());
573 // FIXME: handle tail calls differently.
575 if (Subtarget->isThumb()) {
576 if (!Subtarget->hasV5TOps() && (!isDirect || isARMFunc))
577 CallOpc = ARMISD::CALL_NOLINK;
579 CallOpc = isARMFunc ? ARMISD::CALL : ARMISD::tCALL;
581 CallOpc = (isDirect || Subtarget->hasV5TOps())
582 ? (isLocalARMFunc ? ARMISD::CALL_PRED : ARMISD::CALL)
583 : ARMISD::CALL_NOLINK;
585 if (CallOpc == ARMISD::CALL_NOLINK && !Subtarget->isThumb()) {
586 // implicit def LR - LR mustn't be allocated as GRP:$dst of CALL_NOLINK
587 Chain = DAG.getCopyToReg(Chain, dl, ARM::LR, DAG.getUNDEF(MVT::i32),InFlag);
588 InFlag = Chain.getValue(1);
591 std::vector<SDValue> Ops;
592 Ops.push_back(Chain);
593 Ops.push_back(Callee);
595 // Add argument registers to the end of the list so that they are known live
597 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
598 Ops.push_back(DAG.getRegister(RegsToPass[i].first,
599 RegsToPass[i].second.getValueType()));
601 if (InFlag.getNode())
602 Ops.push_back(InFlag);
603 // Returns a chain and a flag for retval copy to use.
604 Chain = DAG.getNode(CallOpc, dl, DAG.getVTList(MVT::Other, MVT::Flag),
605 &Ops[0], Ops.size());
606 InFlag = Chain.getValue(1);
608 Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(NumBytes, true),
609 DAG.getIntPtrConstant(0, true), InFlag);
610 if (RetVT != MVT::Other)
611 InFlag = Chain.getValue(1);
613 std::vector<SDValue> ResultVals;
615 // If the call has results, copy the values out of the ret val registers.
616 switch (RetVT.getSimpleVT()) {
617 default: assert(0 && "Unexpected ret value!");
621 Chain = DAG.getCopyFromReg(Chain, dl, ARM::R0,
622 MVT::i32, InFlag).getValue(1);
623 ResultVals.push_back(Chain.getValue(0));
624 if (TheCall->getNumRetVals() > 1 &&
625 TheCall->getRetValType(1) == MVT::i32) {
626 // Returns a i64 value.
627 Chain = DAG.getCopyFromReg(Chain, dl, ARM::R1, MVT::i32,
628 Chain.getValue(2)).getValue(1);
629 ResultVals.push_back(Chain.getValue(0));
633 Chain = DAG.getCopyFromReg(Chain, dl, ARM::R0,
634 MVT::i32, InFlag).getValue(1);
635 ResultVals.push_back(DAG.getNode(ISD::BIT_CONVERT, dl, MVT::f32,
639 SDValue Lo = DAG.getCopyFromReg(Chain, dl, ARM::R0, MVT::i32, InFlag);
640 SDValue Hi = DAG.getCopyFromReg(Lo, dl, ARM::R1, MVT::i32, Lo.getValue(2));
641 ResultVals.push_back(DAG.getNode(ARMISD::FMDRR, dl, MVT::f64, Lo, Hi));
646 if (ResultVals.empty())
649 ResultVals.push_back(Chain);
650 SDValue Res = DAG.getMergeValues(&ResultVals[0], ResultVals.size(), dl);
651 return Res.getValue(Op.getResNo());
654 static SDValue LowerRET(SDValue Op, SelectionDAG &DAG) {
656 SDValue Chain = Op.getOperand(0);
657 DebugLoc dl = Op.getDebugLoc();
658 switch(Op.getNumOperands()) {
660 assert(0 && "Do not know how to return this many arguments!");
663 SDValue LR = DAG.getRegister(ARM::LR, MVT::i32);
664 return DAG.getNode(ARMISD::RET_FLAG, dl, MVT::Other, Chain);
667 Op = Op.getOperand(1);
668 if (Op.getValueType() == MVT::f32) {
669 Op = DAG.getNode(ISD::BIT_CONVERT, dl, MVT::i32, Op);
670 } else if (Op.getValueType() == MVT::f64) {
671 // Legalize ret f64 -> ret 2 x i32. We always have fmrrd if f64 is
673 Op = DAG.getNode(ARMISD::FMRRD, dl,
674 DAG.getVTList(MVT::i32, MVT::i32), &Op,1);
675 SDValue Sign = DAG.getConstant(0, MVT::i32);
676 return DAG.getNode(ISD::RET, dl, MVT::Other, Chain, Op, Sign,
677 Op.getValue(1), Sign);
679 Copy = DAG.getCopyToReg(Chain, dl, ARM::R0, Op, SDValue());
680 if (DAG.getMachineFunction().getRegInfo().liveout_empty())
681 DAG.getMachineFunction().getRegInfo().addLiveOut(ARM::R0);
684 Copy = DAG.getCopyToReg(Chain, dl, ARM::R1, Op.getOperand(3), SDValue());
685 Copy = DAG.getCopyToReg(Copy, dl, ARM::R0, Op.getOperand(1),
687 // If we haven't noted the R0+R1 are live out, do so now.
688 if (DAG.getMachineFunction().getRegInfo().liveout_empty()) {
689 DAG.getMachineFunction().getRegInfo().addLiveOut(ARM::R0);
690 DAG.getMachineFunction().getRegInfo().addLiveOut(ARM::R1);
693 case 9: // i128 -> 4 regs
694 Copy = DAG.getCopyToReg(Chain, dl, ARM::R3, Op.getOperand(7), SDValue());
695 Copy = DAG.getCopyToReg(Copy, dl, ARM::R2, Op.getOperand(5),
697 Copy = DAG.getCopyToReg(Copy, dl, ARM::R1, Op.getOperand(3),
699 Copy = DAG.getCopyToReg(Copy, dl, ARM::R0, Op.getOperand(1),
701 // If we haven't noted the R0+R1 are live out, do so now.
702 if (DAG.getMachineFunction().getRegInfo().liveout_empty()) {
703 DAG.getMachineFunction().getRegInfo().addLiveOut(ARM::R0);
704 DAG.getMachineFunction().getRegInfo().addLiveOut(ARM::R1);
705 DAG.getMachineFunction().getRegInfo().addLiveOut(ARM::R2);
706 DAG.getMachineFunction().getRegInfo().addLiveOut(ARM::R3);
712 //We must use RET_FLAG instead of BRIND because BRIND doesn't have a flag
713 return DAG.getNode(ARMISD::RET_FLAG, dl, MVT::Other, Copy, Copy.getValue(1));
716 // ConstantPool, JumpTable, GlobalAddress, and ExternalSymbol are lowered as
717 // their target countpart wrapped in the ARMISD::Wrapper node. Suppose N is
718 // one of the above mentioned nodes. It has to be wrapped because otherwise
719 // Select(N) returns N. So the raw TargetGlobalAddress nodes, etc. can only
720 // be used to form addressing mode. These wrapped nodes will be selected
722 static SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) {
723 MVT PtrVT = Op.getValueType();
724 // FIXME there is no actual debug info here
725 DebugLoc dl = Op.getDebugLoc();
726 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
728 if (CP->isMachineConstantPoolEntry())
729 Res = DAG.getTargetConstantPool(CP->getMachineCPVal(), PtrVT,
732 Res = DAG.getTargetConstantPool(CP->getConstVal(), PtrVT,
734 return DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, Res);
737 // Lower ISD::GlobalTLSAddress using the "general dynamic" model
739 ARMTargetLowering::LowerToTLSGeneralDynamicModel(GlobalAddressSDNode *GA,
741 DebugLoc dl = GA->getDebugLoc();
742 MVT PtrVT = getPointerTy();
743 unsigned char PCAdj = Subtarget->isThumb() ? 4 : 8;
744 ARMConstantPoolValue *CPV =
745 new ARMConstantPoolValue(GA->getGlobal(), ARMPCLabelIndex, ARMCP::CPValue,
746 PCAdj, "tlsgd", true);
747 SDValue Argument = DAG.getTargetConstantPool(CPV, PtrVT, 4);
748 Argument = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, Argument);
749 Argument = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), Argument, NULL, 0);
750 SDValue Chain = Argument.getValue(1);
752 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
753 Argument = DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Argument, PICLabel);
755 // call __tls_get_addr.
758 Entry.Node = Argument;
759 Entry.Ty = (const Type *) Type::Int32Ty;
760 Args.push_back(Entry);
761 // FIXME: is there useful debug info available here?
762 std::pair<SDValue, SDValue> CallResult =
763 LowerCallTo(Chain, (const Type *) Type::Int32Ty, false, false, false, false,
764 CallingConv::C, false,
765 DAG.getExternalSymbol("__tls_get_addr", PtrVT), Args, DAG, dl);
766 return CallResult.first;
769 // Lower ISD::GlobalTLSAddress using the "initial exec" or
770 // "local exec" model.
772 ARMTargetLowering::LowerToTLSExecModels(GlobalAddressSDNode *GA,
774 GlobalValue *GV = GA->getGlobal();
775 DebugLoc dl = GA->getDebugLoc();
777 SDValue Chain = DAG.getEntryNode();
778 MVT PtrVT = getPointerTy();
779 // Get the Thread Pointer
780 SDValue ThreadPointer = DAG.getNode(ARMISD::THREAD_POINTER, dl, PtrVT);
782 if (GV->isDeclaration()){
783 // initial exec model
784 unsigned char PCAdj = Subtarget->isThumb() ? 4 : 8;
785 ARMConstantPoolValue *CPV =
786 new ARMConstantPoolValue(GA->getGlobal(), ARMPCLabelIndex, ARMCP::CPValue,
787 PCAdj, "gottpoff", true);
788 Offset = DAG.getTargetConstantPool(CPV, PtrVT, 4);
789 Offset = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, Offset);
790 Offset = DAG.getLoad(PtrVT, dl, Chain, Offset, NULL, 0);
791 Chain = Offset.getValue(1);
793 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
794 Offset = DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Offset, PICLabel);
796 Offset = DAG.getLoad(PtrVT, dl, Chain, Offset, NULL, 0);
799 ARMConstantPoolValue *CPV =
800 new ARMConstantPoolValue(GV, ARMCP::CPValue, "tpoff");
801 Offset = DAG.getTargetConstantPool(CPV, PtrVT, 4);
802 Offset = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, Offset);
803 Offset = DAG.getLoad(PtrVT, dl, Chain, Offset, NULL, 0);
806 // The address of the thread local variable is the add of the thread
807 // pointer with the offset of the variable.
808 return DAG.getNode(ISD::ADD, dl, PtrVT, ThreadPointer, Offset);
812 ARMTargetLowering::LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) {
813 // TODO: implement the "local dynamic" model
814 assert(Subtarget->isTargetELF() &&
815 "TLS not implemented for non-ELF targets");
816 GlobalAddressSDNode *GA = cast<GlobalAddressSDNode>(Op);
817 // If the relocation model is PIC, use the "General Dynamic" TLS Model,
818 // otherwise use the "Local Exec" TLS Model
819 if (getTargetMachine().getRelocationModel() == Reloc::PIC_)
820 return LowerToTLSGeneralDynamicModel(GA, DAG);
822 return LowerToTLSExecModels(GA, DAG);
825 SDValue ARMTargetLowering::LowerGlobalAddressELF(SDValue Op,
827 MVT PtrVT = getPointerTy();
828 DebugLoc dl = Op.getDebugLoc();
829 GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
830 Reloc::Model RelocM = getTargetMachine().getRelocationModel();
831 if (RelocM == Reloc::PIC_) {
832 bool UseGOTOFF = GV->hasLocalLinkage() || GV->hasHiddenVisibility();
833 ARMConstantPoolValue *CPV =
834 new ARMConstantPoolValue(GV, ARMCP::CPValue, UseGOTOFF ? "GOTOFF":"GOT");
835 SDValue CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4);
836 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
837 SDValue Result = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(),
839 SDValue Chain = Result.getValue(1);
840 SDValue GOT = DAG.getGLOBAL_OFFSET_TABLE(PtrVT);
841 Result = DAG.getNode(ISD::ADD, dl, PtrVT, Result, GOT);
843 Result = DAG.getLoad(PtrVT, dl, Chain, Result, NULL, 0);
846 SDValue CPAddr = DAG.getTargetConstantPool(GV, PtrVT, 4);
847 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
848 return DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), CPAddr, NULL, 0);
852 /// GVIsIndirectSymbol - true if the GV will be accessed via an indirect symbol
853 /// even in non-static mode.
854 static bool GVIsIndirectSymbol(GlobalValue *GV, Reloc::Model RelocM) {
855 // If symbol visibility is hidden, the extra load is not needed if
856 // the symbol is definitely defined in the current translation unit.
857 bool isDecl = GV->isDeclaration() && !GV->hasNotBeenReadFromBitcode();
858 if (GV->hasHiddenVisibility() && (!isDecl && !GV->hasCommonLinkage()))
860 return RelocM != Reloc::Static && (isDecl || GV->isWeakForLinker());
863 SDValue ARMTargetLowering::LowerGlobalAddressDarwin(SDValue Op,
865 MVT PtrVT = getPointerTy();
866 DebugLoc dl = Op.getDebugLoc();
867 GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
868 Reloc::Model RelocM = getTargetMachine().getRelocationModel();
869 bool IsIndirect = GVIsIndirectSymbol(GV, RelocM);
871 if (RelocM == Reloc::Static)
872 CPAddr = DAG.getTargetConstantPool(GV, PtrVT, 4);
874 unsigned PCAdj = (RelocM != Reloc::PIC_)
875 ? 0 : (Subtarget->isThumb() ? 4 : 8);
876 ARMCP::ARMCPKind Kind = IsIndirect ? ARMCP::CPNonLazyPtr
878 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(GV, ARMPCLabelIndex,
880 CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4);
882 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
884 SDValue Result = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), CPAddr, NULL, 0);
885 SDValue Chain = Result.getValue(1);
887 if (RelocM == Reloc::PIC_) {
888 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
889 Result = DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Result, PICLabel);
892 Result = DAG.getLoad(PtrVT, dl, Chain, Result, NULL, 0);
897 SDValue ARMTargetLowering::LowerGLOBAL_OFFSET_TABLE(SDValue Op,
899 assert(Subtarget->isTargetELF() &&
900 "GLOBAL OFFSET TABLE not implemented for non-ELF targets");
901 MVT PtrVT = getPointerTy();
902 DebugLoc dl = Op.getDebugLoc();
903 unsigned PCAdj = Subtarget->isThumb() ? 4 : 8;
904 ARMConstantPoolValue *CPV = new ARMConstantPoolValue("_GLOBAL_OFFSET_TABLE_",
906 ARMCP::CPValue, PCAdj);
907 SDValue CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4);
908 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
909 SDValue Result = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), CPAddr, NULL, 0);
910 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
911 return DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Result, PICLabel);
914 static SDValue LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG) {
915 MVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
916 unsigned IntNo = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
918 default: return SDValue(); // Don't custom lower most intrinsics.
919 case Intrinsic::arm_thread_pointer:
920 return DAG.getNode(ARMISD::THREAD_POINTER, DebugLoc::getUnknownLoc(),
925 static SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG,
926 unsigned VarArgsFrameIndex) {
927 // vastart just stores the address of the VarArgsFrameIndex slot into the
928 // memory location argument.
929 DebugLoc dl = Op.getDebugLoc();
930 MVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
931 SDValue FR = DAG.getFrameIndex(VarArgsFrameIndex, PtrVT);
932 const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
933 return DAG.getStore(Op.getOperand(0), dl, FR, Op.getOperand(1), SV, 0);
936 static SDValue LowerFORMAL_ARGUMENT(SDValue Op, SelectionDAG &DAG,
937 unsigned ArgNo, unsigned &NumGPRs,
938 unsigned &ArgOffset, DebugLoc dl) {
939 MachineFunction &MF = DAG.getMachineFunction();
940 MVT ObjectVT = Op.getValue(ArgNo).getValueType();
941 SDValue Root = Op.getOperand(0);
942 MachineRegisterInfo &RegInfo = MF.getRegInfo();
943 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
945 static const unsigned GPRArgRegs[] = {
946 ARM::R0, ARM::R1, ARM::R2, ARM::R3
953 ISD::ArgFlagsTy Flags =
954 cast<ARG_FLAGSSDNode>(Op.getOperand(ArgNo + 3))->getArgFlags();
955 HowToPassArgument(ObjectVT, NumGPRs, ArgOffset, ObjGPRs,
956 ObjSize, GPRPad, StackPad, Flags);
958 ArgOffset += StackPad;
963 if (AFI->isThumbFunction())
964 VReg = RegInfo.createVirtualRegister(ARM::tGPRRegisterClass);
966 VReg = RegInfo.createVirtualRegister(ARM::GPRRegisterClass);
967 RegInfo.addLiveIn(GPRArgRegs[NumGPRs], VReg);
968 ArgValue = DAG.getCopyFromReg(Root, dl, VReg, MVT::i32);
969 if (ObjectVT == MVT::f32)
970 ArgValue = DAG.getNode(ISD::BIT_CONVERT, dl, MVT::f32, ArgValue);
971 } else if (ObjGPRs == 2) {
973 if (AFI->isThumbFunction())
974 VReg = RegInfo.createVirtualRegister(ARM::tGPRRegisterClass);
976 VReg = RegInfo.createVirtualRegister(ARM::GPRRegisterClass);
977 RegInfo.addLiveIn(GPRArgRegs[NumGPRs], VReg);
978 ArgValue = DAG.getCopyFromReg(Root, dl, VReg, MVT::i32);
980 if (AFI->isThumbFunction())
981 VReg = RegInfo.createVirtualRegister(ARM::tGPRRegisterClass);
983 VReg = RegInfo.createVirtualRegister(ARM::GPRRegisterClass);
984 RegInfo.addLiveIn(GPRArgRegs[NumGPRs+1], VReg);
985 SDValue ArgValue2 = DAG.getCopyFromReg(Root, dl, VReg, MVT::i32);
987 assert(ObjectVT != MVT::i64 && "i64 should already be lowered");
988 ArgValue = DAG.getNode(ARMISD::FMDRR, dl, MVT::f64, ArgValue, ArgValue2);
993 MachineFrameInfo *MFI = MF.getFrameInfo();
994 int FI = MFI->CreateFixedObject(ObjSize, ArgOffset);
995 SDValue FIN = DAG.getFrameIndex(FI, MVT::i32);
997 ArgValue = DAG.getLoad(ObjectVT, dl, Root, FIN, NULL, 0);
999 SDValue ArgValue2 = DAG.getLoad(MVT::i32, dl, Root, FIN, NULL, 0);
1000 assert(ObjectVT != MVT::i64 && "i64 should already be lowered");
1001 ArgValue = DAG.getNode(ARMISD::FMDRR, dl, MVT::f64, ArgValue, ArgValue2);
1004 ArgOffset += ObjSize; // Move on to the next argument.
1011 ARMTargetLowering::LowerFORMAL_ARGUMENTS(SDValue Op, SelectionDAG &DAG) {
1012 std::vector<SDValue> ArgValues;
1013 SDValue Root = Op.getOperand(0);
1014 DebugLoc dl = Op.getDebugLoc();
1015 unsigned ArgOffset = 0; // Frame mechanisms handle retaddr slot
1016 unsigned NumGPRs = 0; // GPRs used for parameter passing.
1018 unsigned NumArgs = Op.getNode()->getNumValues()-1;
1019 for (unsigned ArgNo = 0; ArgNo < NumArgs; ++ArgNo)
1020 ArgValues.push_back(LowerFORMAL_ARGUMENT(Op, DAG, ArgNo,
1021 NumGPRs, ArgOffset, dl));
1023 bool isVarArg = cast<ConstantSDNode>(Op.getOperand(2))->getZExtValue() != 0;
1025 static const unsigned GPRArgRegs[] = {
1026 ARM::R0, ARM::R1, ARM::R2, ARM::R3
1029 MachineFunction &MF = DAG.getMachineFunction();
1030 MachineRegisterInfo &RegInfo = MF.getRegInfo();
1031 MachineFrameInfo *MFI = MF.getFrameInfo();
1032 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1033 unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
1034 unsigned VARegSize = (4 - NumGPRs) * 4;
1035 unsigned VARegSaveSize = (VARegSize + Align - 1) & ~(Align - 1);
1036 if (VARegSaveSize) {
1037 // If this function is vararg, store any remaining integer argument regs
1038 // to their spots on the stack so that they may be loaded by deferencing
1039 // the result of va_next.
1040 AFI->setVarArgsRegSaveSize(VARegSaveSize);
1041 VarArgsFrameIndex = MFI->CreateFixedObject(VARegSaveSize, ArgOffset +
1042 VARegSaveSize - VARegSize);
1043 SDValue FIN = DAG.getFrameIndex(VarArgsFrameIndex, getPointerTy());
1045 SmallVector<SDValue, 4> MemOps;
1046 for (; NumGPRs < 4; ++NumGPRs) {
1048 if (AFI->isThumbFunction())
1049 VReg = RegInfo.createVirtualRegister(ARM::tGPRRegisterClass);
1051 VReg = RegInfo.createVirtualRegister(ARM::GPRRegisterClass);
1052 RegInfo.addLiveIn(GPRArgRegs[NumGPRs], VReg);
1053 SDValue Val = DAG.getCopyFromReg(Root, dl, VReg, MVT::i32);
1054 SDValue Store = DAG.getStore(Val.getValue(1), dl, Val, FIN, NULL, 0);
1055 MemOps.push_back(Store);
1056 FIN = DAG.getNode(ISD::ADD, dl, getPointerTy(), FIN,
1057 DAG.getConstant(4, getPointerTy()));
1059 if (!MemOps.empty())
1060 Root = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
1061 &MemOps[0], MemOps.size());
1063 // This will point to the next argument passed via stack.
1064 VarArgsFrameIndex = MFI->CreateFixedObject(4, ArgOffset);
1067 ArgValues.push_back(Root);
1069 // Return the new list of results.
1070 return DAG.getNode(ISD::MERGE_VALUES, dl, Op.getNode()->getVTList(),
1071 &ArgValues[0], ArgValues.size());
1074 /// isFloatingPointZero - Return true if this is +0.0.
1075 static bool isFloatingPointZero(SDValue Op) {
1076 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(Op))
1077 return CFP->getValueAPF().isPosZero();
1078 else if (ISD::isEXTLoad(Op.getNode()) || ISD::isNON_EXTLoad(Op.getNode())) {
1079 // Maybe this has already been legalized into the constant pool?
1080 if (Op.getOperand(1).getOpcode() == ARMISD::Wrapper) {
1081 SDValue WrapperOp = Op.getOperand(1).getOperand(0);
1082 if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(WrapperOp))
1083 if (ConstantFP *CFP = dyn_cast<ConstantFP>(CP->getConstVal()))
1084 return CFP->getValueAPF().isPosZero();
1090 static bool isLegalCmpImmediate(unsigned C, bool isThumb) {
1091 return ( isThumb && (C & ~255U) == 0) ||
1092 (!isThumb && ARM_AM::getSOImmVal(C) != -1);
1095 /// Returns appropriate ARM CMP (cmp) and corresponding condition code for
1096 /// the given operands.
1097 static SDValue getARMCmp(SDValue LHS, SDValue RHS, ISD::CondCode CC,
1098 SDValue &ARMCC, SelectionDAG &DAG, bool isThumb,
1100 if (ConstantSDNode *RHSC = dyn_cast<ConstantSDNode>(RHS.getNode())) {
1101 unsigned C = RHSC->getZExtValue();
1102 if (!isLegalCmpImmediate(C, isThumb)) {
1103 // Constant does not fit, try adjusting it by one?
1108 if (isLegalCmpImmediate(C-1, isThumb)) {
1109 CC = (CC == ISD::SETLT) ? ISD::SETLE : ISD::SETGT;
1110 RHS = DAG.getConstant(C-1, MVT::i32);
1115 if (C > 0 && isLegalCmpImmediate(C-1, isThumb)) {
1116 CC = (CC == ISD::SETULT) ? ISD::SETULE : ISD::SETUGT;
1117 RHS = DAG.getConstant(C-1, MVT::i32);
1122 if (isLegalCmpImmediate(C+1, isThumb)) {
1123 CC = (CC == ISD::SETLE) ? ISD::SETLT : ISD::SETGE;
1124 RHS = DAG.getConstant(C+1, MVT::i32);
1129 if (C < 0xffffffff && isLegalCmpImmediate(C+1, isThumb)) {
1130 CC = (CC == ISD::SETULE) ? ISD::SETULT : ISD::SETUGE;
1131 RHS = DAG.getConstant(C+1, MVT::i32);
1138 ARMCC::CondCodes CondCode = IntCCToARMCC(CC);
1139 ARMISD::NodeType CompareType;
1142 CompareType = ARMISD::CMP;
1148 // Uses only N and Z Flags
1149 CompareType = ARMISD::CMPNZ;
1152 ARMCC = DAG.getConstant(CondCode, MVT::i32);
1153 return DAG.getNode(CompareType, dl, MVT::Flag, LHS, RHS);
1156 /// Returns a appropriate VFP CMP (fcmp{s|d}+fmstat) for the given operands.
1157 static SDValue getVFPCmp(SDValue LHS, SDValue RHS, SelectionDAG &DAG,
1160 if (!isFloatingPointZero(RHS))
1161 Cmp = DAG.getNode(ARMISD::CMPFP, dl, MVT::Flag, LHS, RHS);
1163 Cmp = DAG.getNode(ARMISD::CMPFPw0, dl, MVT::Flag, LHS);
1164 return DAG.getNode(ARMISD::FMSTAT, dl, MVT::Flag, Cmp);
1167 static SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG,
1168 const ARMSubtarget *ST) {
1169 MVT VT = Op.getValueType();
1170 SDValue LHS = Op.getOperand(0);
1171 SDValue RHS = Op.getOperand(1);
1172 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
1173 SDValue TrueVal = Op.getOperand(2);
1174 SDValue FalseVal = Op.getOperand(3);
1175 DebugLoc dl = Op.getDebugLoc();
1177 if (LHS.getValueType() == MVT::i32) {
1179 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
1180 SDValue Cmp = getARMCmp(LHS, RHS, CC, ARMCC, DAG, ST->isThumb(), dl);
1181 return DAG.getNode(ARMISD::CMOV, dl, VT, FalseVal, TrueVal, ARMCC, CCR,Cmp);
1184 ARMCC::CondCodes CondCode, CondCode2;
1185 if (FPCCToARMCC(CC, CondCode, CondCode2))
1186 std::swap(TrueVal, FalseVal);
1188 SDValue ARMCC = DAG.getConstant(CondCode, MVT::i32);
1189 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
1190 SDValue Cmp = getVFPCmp(LHS, RHS, DAG, dl);
1191 SDValue Result = DAG.getNode(ARMISD::CMOV, dl, VT, FalseVal, TrueVal,
1193 if (CondCode2 != ARMCC::AL) {
1194 SDValue ARMCC2 = DAG.getConstant(CondCode2, MVT::i32);
1195 // FIXME: Needs another CMP because flag can have but one use.
1196 SDValue Cmp2 = getVFPCmp(LHS, RHS, DAG, dl);
1197 Result = DAG.getNode(ARMISD::CMOV, dl, VT,
1198 Result, TrueVal, ARMCC2, CCR, Cmp2);
1203 static SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG,
1204 const ARMSubtarget *ST) {
1205 SDValue Chain = Op.getOperand(0);
1206 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get();
1207 SDValue LHS = Op.getOperand(2);
1208 SDValue RHS = Op.getOperand(3);
1209 SDValue Dest = Op.getOperand(4);
1210 DebugLoc dl = Op.getDebugLoc();
1212 if (LHS.getValueType() == MVT::i32) {
1214 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
1215 SDValue Cmp = getARMCmp(LHS, RHS, CC, ARMCC, DAG, ST->isThumb(), dl);
1216 return DAG.getNode(ARMISD::BRCOND, dl, MVT::Other,
1217 Chain, Dest, ARMCC, CCR,Cmp);
1220 assert(LHS.getValueType() == MVT::f32 || LHS.getValueType() == MVT::f64);
1221 ARMCC::CondCodes CondCode, CondCode2;
1222 if (FPCCToARMCC(CC, CondCode, CondCode2))
1223 // Swap the LHS/RHS of the comparison if needed.
1224 std::swap(LHS, RHS);
1226 SDValue Cmp = getVFPCmp(LHS, RHS, DAG, dl);
1227 SDValue ARMCC = DAG.getConstant(CondCode, MVT::i32);
1228 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
1229 SDVTList VTList = DAG.getVTList(MVT::Other, MVT::Flag);
1230 SDValue Ops[] = { Chain, Dest, ARMCC, CCR, Cmp };
1231 SDValue Res = DAG.getNode(ARMISD::BRCOND, dl, VTList, Ops, 5);
1232 if (CondCode2 != ARMCC::AL) {
1233 ARMCC = DAG.getConstant(CondCode2, MVT::i32);
1234 SDValue Ops[] = { Res, Dest, ARMCC, CCR, Res.getValue(1) };
1235 Res = DAG.getNode(ARMISD::BRCOND, dl, VTList, Ops, 5);
1240 SDValue ARMTargetLowering::LowerBR_JT(SDValue Op, SelectionDAG &DAG) {
1241 SDValue Chain = Op.getOperand(0);
1242 SDValue Table = Op.getOperand(1);
1243 SDValue Index = Op.getOperand(2);
1244 DebugLoc dl = Op.getDebugLoc();
1246 MVT PTy = getPointerTy();
1247 JumpTableSDNode *JT = cast<JumpTableSDNode>(Table);
1248 ARMFunctionInfo *AFI = DAG.getMachineFunction().getInfo<ARMFunctionInfo>();
1249 SDValue UId = DAG.getConstant(AFI->createJumpTableUId(), PTy);
1250 SDValue JTI = DAG.getTargetJumpTable(JT->getIndex(), PTy);
1251 Table = DAG.getNode(ARMISD::WrapperJT, dl, MVT::i32, JTI, UId);
1252 Index = DAG.getNode(ISD::MUL, dl, PTy, Index, DAG.getConstant(4, PTy));
1253 SDValue Addr = DAG.getNode(ISD::ADD, dl, PTy, Index, Table);
1254 bool isPIC = getTargetMachine().getRelocationModel() == Reloc::PIC_;
1255 Addr = DAG.getLoad(isPIC ? (MVT)MVT::i32 : PTy, dl,
1256 Chain, Addr, NULL, 0);
1257 Chain = Addr.getValue(1);
1259 Addr = DAG.getNode(ISD::ADD, dl, PTy, Addr, Table);
1260 return DAG.getNode(ARMISD::BR_JT, dl, MVT::Other, Chain, Addr, JTI, UId);
1263 static SDValue LowerFP_TO_INT(SDValue Op, SelectionDAG &DAG) {
1264 DebugLoc dl = Op.getDebugLoc();
1266 Op.getOpcode() == ISD::FP_TO_SINT ? ARMISD::FTOSI : ARMISD::FTOUI;
1267 Op = DAG.getNode(Opc, dl, MVT::f32, Op.getOperand(0));
1268 return DAG.getNode(ISD::BIT_CONVERT, dl, MVT::i32, Op);
1271 static SDValue LowerINT_TO_FP(SDValue Op, SelectionDAG &DAG) {
1272 MVT VT = Op.getValueType();
1273 DebugLoc dl = Op.getDebugLoc();
1275 Op.getOpcode() == ISD::SINT_TO_FP ? ARMISD::SITOF : ARMISD::UITOF;
1277 Op = DAG.getNode(ISD::BIT_CONVERT, dl, MVT::f32, Op.getOperand(0));
1278 return DAG.getNode(Opc, dl, VT, Op);
1281 static SDValue LowerFCOPYSIGN(SDValue Op, SelectionDAG &DAG) {
1282 // Implement fcopysign with a fabs and a conditional fneg.
1283 SDValue Tmp0 = Op.getOperand(0);
1284 SDValue Tmp1 = Op.getOperand(1);
1285 DebugLoc dl = Op.getDebugLoc();
1286 MVT VT = Op.getValueType();
1287 MVT SrcVT = Tmp1.getValueType();
1288 SDValue AbsVal = DAG.getNode(ISD::FABS, dl, VT, Tmp0);
1289 SDValue Cmp = getVFPCmp(Tmp1, DAG.getConstantFP(0.0, SrcVT), DAG, dl);
1290 SDValue ARMCC = DAG.getConstant(ARMCC::LT, MVT::i32);
1291 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
1292 return DAG.getNode(ARMISD::CNEG, dl, VT, AbsVal, AbsVal, ARMCC, CCR, Cmp);
1296 ARMTargetLowering::EmitTargetCodeForMemcpy(SelectionDAG &DAG, DebugLoc dl,
1298 SDValue Dst, SDValue Src,
1299 SDValue Size, unsigned Align,
1301 const Value *DstSV, uint64_t DstSVOff,
1302 const Value *SrcSV, uint64_t SrcSVOff){
1303 // Do repeated 4-byte loads and stores. To be improved.
1304 // This requires 4-byte alignment.
1305 if ((Align & 3) != 0)
1307 // This requires the copy size to be a constant, preferrably
1308 // within a subtarget-specific limit.
1309 ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size);
1312 uint64_t SizeVal = ConstantSize->getZExtValue();
1313 if (!AlwaysInline && SizeVal > getSubtarget()->getMaxInlineSizeThreshold())
1316 unsigned BytesLeft = SizeVal & 3;
1317 unsigned NumMemOps = SizeVal >> 2;
1318 unsigned EmittedNumMemOps = 0;
1320 unsigned VTSize = 4;
1322 const unsigned MAX_LOADS_IN_LDM = 6;
1323 SDValue TFOps[MAX_LOADS_IN_LDM];
1324 SDValue Loads[MAX_LOADS_IN_LDM];
1325 uint64_t SrcOff = 0, DstOff = 0;
1327 // Emit up to MAX_LOADS_IN_LDM loads, then a TokenFactor barrier, then the
1328 // same number of stores. The loads and stores will get combined into
1329 // ldm/stm later on.
1330 while (EmittedNumMemOps < NumMemOps) {
1332 i < MAX_LOADS_IN_LDM && EmittedNumMemOps + i < NumMemOps; ++i) {
1333 Loads[i] = DAG.getLoad(VT, dl, Chain,
1334 DAG.getNode(ISD::ADD, dl, MVT::i32, Src,
1335 DAG.getConstant(SrcOff, MVT::i32)),
1336 SrcSV, SrcSVOff + SrcOff);
1337 TFOps[i] = Loads[i].getValue(1);
1340 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &TFOps[0], i);
1343 i < MAX_LOADS_IN_LDM && EmittedNumMemOps + i < NumMemOps; ++i) {
1344 TFOps[i] = DAG.getStore(Chain, dl, Loads[i],
1345 DAG.getNode(ISD::ADD, dl, MVT::i32, Dst,
1346 DAG.getConstant(DstOff, MVT::i32)),
1347 DstSV, DstSVOff + DstOff);
1350 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &TFOps[0], i);
1352 EmittedNumMemOps += i;
1358 // Issue loads / stores for the trailing (1 - 3) bytes.
1359 unsigned BytesLeftSave = BytesLeft;
1362 if (BytesLeft >= 2) {
1370 Loads[i] = DAG.getLoad(VT, dl, Chain,
1371 DAG.getNode(ISD::ADD, dl, MVT::i32, Src,
1372 DAG.getConstant(SrcOff, MVT::i32)),
1373 SrcSV, SrcSVOff + SrcOff);
1374 TFOps[i] = Loads[i].getValue(1);
1377 BytesLeft -= VTSize;
1379 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &TFOps[0], i);
1382 BytesLeft = BytesLeftSave;
1384 if (BytesLeft >= 2) {
1392 TFOps[i] = DAG.getStore(Chain, dl, Loads[i],
1393 DAG.getNode(ISD::ADD, dl, MVT::i32, Dst,
1394 DAG.getConstant(DstOff, MVT::i32)),
1395 DstSV, DstSVOff + DstOff);
1398 BytesLeft -= VTSize;
1400 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &TFOps[0], i);
1403 static SDValue ExpandBIT_CONVERT(SDNode *N, SelectionDAG &DAG) {
1404 SDValue Op = N->getOperand(0);
1405 DebugLoc dl = N->getDebugLoc();
1406 if (N->getValueType(0) == MVT::f64) {
1407 // Turn i64->f64 into FMDRR.
1408 SDValue Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, Op,
1409 DAG.getConstant(0, MVT::i32));
1410 SDValue Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, Op,
1411 DAG.getConstant(1, MVT::i32));
1412 return DAG.getNode(ARMISD::FMDRR, dl, MVT::f64, Lo, Hi);
1415 // Turn f64->i64 into FMRRD.
1416 SDValue Cvt = DAG.getNode(ARMISD::FMRRD, dl,
1417 DAG.getVTList(MVT::i32, MVT::i32), &Op, 1);
1419 // Merge the pieces into a single i64 value.
1420 return DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, Cvt, Cvt.getValue(1));
1423 static SDValue ExpandSRx(SDNode *N, SelectionDAG &DAG, const ARMSubtarget *ST) {
1424 assert(N->getValueType(0) == MVT::i64 &&
1425 (N->getOpcode() == ISD::SRL || N->getOpcode() == ISD::SRA) &&
1426 "Unknown shift to lower!");
1428 // We only lower SRA, SRL of 1 here, all others use generic lowering.
1429 if (!isa<ConstantSDNode>(N->getOperand(1)) ||
1430 cast<ConstantSDNode>(N->getOperand(1))->getZExtValue() != 1)
1433 // If we are in thumb mode, we don't have RRX.
1434 if (ST->isThumb()) return SDValue();
1436 // Okay, we have a 64-bit SRA or SRL of 1. Lower this to an RRX expr.
1437 DebugLoc dl = N->getDebugLoc();
1438 SDValue Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, N->getOperand(0),
1439 DAG.getConstant(0, MVT::i32));
1440 SDValue Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, N->getOperand(0),
1441 DAG.getConstant(1, MVT::i32));
1443 // First, build a SRA_FLAG/SRL_FLAG op, which shifts the top part by one and
1444 // captures the result into a carry flag.
1445 unsigned Opc = N->getOpcode() == ISD::SRL ? ARMISD::SRL_FLAG:ARMISD::SRA_FLAG;
1446 Hi = DAG.getNode(Opc, dl, DAG.getVTList(MVT::i32, MVT::Flag), &Hi, 1);
1448 // The low part is an ARMISD::RRX operand, which shifts the carry in.
1449 Lo = DAG.getNode(ARMISD::RRX, dl, MVT::i32, Lo, Hi.getValue(1));
1451 // Merge the pieces into a single i64 value.
1452 return DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, Lo, Hi);
1455 SDValue ARMTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) {
1456 switch (Op.getOpcode()) {
1457 default: assert(0 && "Don't know how to custom lower this!"); abort();
1458 case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
1459 case ISD::GlobalAddress:
1460 return Subtarget->isTargetDarwin() ? LowerGlobalAddressDarwin(Op, DAG) :
1461 LowerGlobalAddressELF(Op, DAG);
1462 case ISD::GlobalTLSAddress: return LowerGlobalTLSAddress(Op, DAG);
1463 case ISD::CALL: return LowerCALL(Op, DAG);
1464 case ISD::RET: return LowerRET(Op, DAG);
1465 case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG, Subtarget);
1466 case ISD::BR_CC: return LowerBR_CC(Op, DAG, Subtarget);
1467 case ISD::BR_JT: return LowerBR_JT(Op, DAG);
1468 case ISD::VASTART: return LowerVASTART(Op, DAG, VarArgsFrameIndex);
1469 case ISD::SINT_TO_FP:
1470 case ISD::UINT_TO_FP: return LowerINT_TO_FP(Op, DAG);
1471 case ISD::FP_TO_SINT:
1472 case ISD::FP_TO_UINT: return LowerFP_TO_INT(Op, DAG);
1473 case ISD::FCOPYSIGN: return LowerFCOPYSIGN(Op, DAG);
1474 case ISD::FORMAL_ARGUMENTS: return LowerFORMAL_ARGUMENTS(Op, DAG);
1475 case ISD::RETURNADDR: break;
1476 case ISD::FRAMEADDR: break;
1477 case ISD::GLOBAL_OFFSET_TABLE: return LowerGLOBAL_OFFSET_TABLE(Op, DAG);
1478 case ISD::INTRINSIC_WO_CHAIN: return LowerINTRINSIC_WO_CHAIN(Op, DAG);
1479 case ISD::BIT_CONVERT: return ExpandBIT_CONVERT(Op.getNode(), DAG);
1481 case ISD::SRA: return ExpandSRx(Op.getNode(), DAG,Subtarget);
1486 /// ReplaceNodeResults - Replace the results of node with an illegal result
1487 /// type with new values built out of custom code.
1488 void ARMTargetLowering::ReplaceNodeResults(SDNode *N,
1489 SmallVectorImpl<SDValue>&Results,
1490 SelectionDAG &DAG) {
1491 switch (N->getOpcode()) {
1493 assert(0 && "Don't know how to custom expand this!");
1495 case ISD::BIT_CONVERT:
1496 Results.push_back(ExpandBIT_CONVERT(N, DAG));
1500 SDValue Res = ExpandSRx(N, DAG, Subtarget);
1502 Results.push_back(Res);
1508 //===----------------------------------------------------------------------===//
1509 // ARM Scheduler Hooks
1510 //===----------------------------------------------------------------------===//
1513 ARMTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
1514 MachineBasicBlock *BB) const {
1515 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
1516 DebugLoc dl = MI->getDebugLoc();
1517 switch (MI->getOpcode()) {
1518 default: assert(false && "Unexpected instr type to insert");
1519 case ARM::tMOVCCr: {
1520 // To "insert" a SELECT_CC instruction, we actually have to insert the
1521 // diamond control-flow pattern. The incoming instruction knows the
1522 // destination vreg to set, the condition code register to branch on, the
1523 // true/false values to select between, and a branch opcode to use.
1524 const BasicBlock *LLVM_BB = BB->getBasicBlock();
1525 MachineFunction::iterator It = BB;
1531 // cmpTY ccX, r1, r2
1533 // fallthrough --> copy0MBB
1534 MachineBasicBlock *thisMBB = BB;
1535 MachineFunction *F = BB->getParent();
1536 MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
1537 MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
1538 BuildMI(BB, dl, TII->get(ARM::tBcc)).addMBB(sinkMBB)
1539 .addImm(MI->getOperand(3).getImm()).addReg(MI->getOperand(4).getReg());
1540 F->insert(It, copy0MBB);
1541 F->insert(It, sinkMBB);
1542 // Update machine-CFG edges by first adding all successors of the current
1543 // block to the new block which will contain the Phi node for the select.
1544 for(MachineBasicBlock::succ_iterator i = BB->succ_begin(),
1545 e = BB->succ_end(); i != e; ++i)
1546 sinkMBB->addSuccessor(*i);
1547 // Next, remove all successors of the current block, and add the true
1548 // and fallthrough blocks as its successors.
1549 while(!BB->succ_empty())
1550 BB->removeSuccessor(BB->succ_begin());
1551 BB->addSuccessor(copy0MBB);
1552 BB->addSuccessor(sinkMBB);
1555 // %FalseValue = ...
1556 // # fallthrough to sinkMBB
1559 // Update machine-CFG edges
1560 BB->addSuccessor(sinkMBB);
1563 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
1566 BuildMI(BB, dl, TII->get(ARM::PHI), MI->getOperand(0).getReg())
1567 .addReg(MI->getOperand(1).getReg()).addMBB(copy0MBB)
1568 .addReg(MI->getOperand(2).getReg()).addMBB(thisMBB);
1570 F->DeleteMachineInstr(MI); // The pseudo instruction is gone now.
1576 //===----------------------------------------------------------------------===//
1577 // ARM Optimization Hooks
1578 //===----------------------------------------------------------------------===//
1581 SDValue combineSelectAndUse(SDNode *N, SDValue Slct, SDValue OtherOp,
1582 TargetLowering::DAGCombinerInfo &DCI) {
1583 SelectionDAG &DAG = DCI.DAG;
1584 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
1585 MVT VT = N->getValueType(0);
1586 unsigned Opc = N->getOpcode();
1587 bool isSlctCC = Slct.getOpcode() == ISD::SELECT_CC;
1588 SDValue LHS = isSlctCC ? Slct.getOperand(2) : Slct.getOperand(1);
1589 SDValue RHS = isSlctCC ? Slct.getOperand(3) : Slct.getOperand(2);
1590 ISD::CondCode CC = ISD::SETCC_INVALID;
1593 CC = cast<CondCodeSDNode>(Slct.getOperand(4))->get();
1595 SDValue CCOp = Slct.getOperand(0);
1596 if (CCOp.getOpcode() == ISD::SETCC)
1597 CC = cast<CondCodeSDNode>(CCOp.getOperand(2))->get();
1600 bool DoXform = false;
1602 assert ((Opc == ISD::ADD || (Opc == ISD::SUB && Slct == N->getOperand(1))) &&
1605 if (LHS.getOpcode() == ISD::Constant &&
1606 cast<ConstantSDNode>(LHS)->isNullValue()) {
1608 } else if (CC != ISD::SETCC_INVALID &&
1609 RHS.getOpcode() == ISD::Constant &&
1610 cast<ConstantSDNode>(RHS)->isNullValue()) {
1611 std::swap(LHS, RHS);
1612 SDValue Op0 = Slct.getOperand(0);
1613 MVT OpVT = isSlctCC ? Op0.getValueType() :
1614 Op0.getOperand(0).getValueType();
1615 bool isInt = OpVT.isInteger();
1616 CC = ISD::getSetCCInverse(CC, isInt);
1618 if (!TLI.isCondCodeLegal(CC, OpVT))
1619 return SDValue(); // Inverse operator isn't legal.
1626 SDValue Result = DAG.getNode(Opc, RHS.getDebugLoc(), VT, OtherOp, RHS);
1628 return DAG.getSelectCC(N->getDebugLoc(), OtherOp, Result,
1629 Slct.getOperand(0), Slct.getOperand(1), CC);
1630 SDValue CCOp = Slct.getOperand(0);
1632 CCOp = DAG.getSetCC(Slct.getDebugLoc(), CCOp.getValueType(),
1633 CCOp.getOperand(0), CCOp.getOperand(1), CC);
1634 return DAG.getNode(ISD::SELECT, N->getDebugLoc(), VT,
1635 CCOp, OtherOp, Result);
1640 /// PerformADDCombine - Target-specific dag combine xforms for ISD::ADD.
1641 static SDValue PerformADDCombine(SDNode *N,
1642 TargetLowering::DAGCombinerInfo &DCI) {
1643 // added by evan in r37685 with no testcase.
1644 SDValue N0 = N->getOperand(0), N1 = N->getOperand(1);
1646 // fold (add (select cc, 0, c), x) -> (select cc, x, (add, x, c))
1647 if (N0.getOpcode() == ISD::SELECT && N0.getNode()->hasOneUse()) {
1648 SDValue Result = combineSelectAndUse(N, N0, N1, DCI);
1649 if (Result.getNode()) return Result;
1651 if (N1.getOpcode() == ISD::SELECT && N1.getNode()->hasOneUse()) {
1652 SDValue Result = combineSelectAndUse(N, N1, N0, DCI);
1653 if (Result.getNode()) return Result;
1659 /// PerformSUBCombine - Target-specific dag combine xforms for ISD::SUB.
1660 static SDValue PerformSUBCombine(SDNode *N,
1661 TargetLowering::DAGCombinerInfo &DCI) {
1662 // added by evan in r37685 with no testcase.
1663 SDValue N0 = N->getOperand(0), N1 = N->getOperand(1);
1665 // fold (sub x, (select cc, 0, c)) -> (select cc, x, (sub, x, c))
1666 if (N1.getOpcode() == ISD::SELECT && N1.getNode()->hasOneUse()) {
1667 SDValue Result = combineSelectAndUse(N, N1, N0, DCI);
1668 if (Result.getNode()) return Result;
1675 /// PerformFMRRDCombine - Target-specific dag combine xforms for ARMISD::FMRRD.
1676 static SDValue PerformFMRRDCombine(SDNode *N,
1677 TargetLowering::DAGCombinerInfo &DCI) {
1678 // fmrrd(fmdrr x, y) -> x,y
1679 SDValue InDouble = N->getOperand(0);
1680 if (InDouble.getOpcode() == ARMISD::FMDRR)
1681 return DCI.CombineTo(N, InDouble.getOperand(0), InDouble.getOperand(1));
1685 SDValue ARMTargetLowering::PerformDAGCombine(SDNode *N,
1686 DAGCombinerInfo &DCI) const {
1687 switch (N->getOpcode()) {
1689 case ISD::ADD: return PerformADDCombine(N, DCI);
1690 case ISD::SUB: return PerformSUBCombine(N, DCI);
1691 case ARMISD::FMRRD: return PerformFMRRDCombine(N, DCI);
1697 /// isLegalAddressImmediate - Return true if the integer value can be used
1698 /// as the offset of the target addressing mode for load / store of the
1700 static bool isLegalAddressImmediate(int64_t V, MVT VT,
1701 const ARMSubtarget *Subtarget) {
1708 if (Subtarget->isThumb()) {
1713 switch (VT.getSimpleVT()) {
1714 default: return false;
1729 if ((V & (Scale - 1)) != 0)
1732 return V == (V & ((1LL << 5) - 1));
1737 switch (VT.getSimpleVT()) {
1738 default: return false;
1743 return V == (V & ((1LL << 12) - 1));
1746 return V == (V & ((1LL << 8) - 1));
1749 if (!Subtarget->hasVFP2())
1754 return V == (V & ((1LL << 8) - 1));
1758 /// isLegalAddressingMode - Return true if the addressing mode represented
1759 /// by AM is legal for this target, for a load/store of the specified type.
1760 bool ARMTargetLowering::isLegalAddressingMode(const AddrMode &AM,
1761 const Type *Ty) const {
1762 if (!isLegalAddressImmediate(AM.BaseOffs, getValueType(Ty, true), Subtarget))
1765 // Can never fold addr of global into load/store.
1770 case 0: // no scale reg, must be "r+i" or "r", or "i".
1773 if (Subtarget->isThumb())
1777 // ARM doesn't support any R+R*scale+imm addr modes.
1781 int Scale = AM.Scale;
1782 switch (getValueType(Ty).getSimpleVT()) {
1783 default: return false;
1788 // This assumes i64 is legalized to a pair of i32. If not (i.e.
1789 // ldrd / strd are used, then its address mode is same as i16.
1791 if (Scale < 0) Scale = -Scale;
1795 return isPowerOf2_32(Scale & ~1);
1798 if (((unsigned)AM.HasBaseReg + Scale) <= 2)
1803 // Note, we allow "void" uses (basically, uses that aren't loads or
1804 // stores), because arm allows folding a scale into many arithmetic
1805 // operations. This should be made more precise and revisited later.
1807 // Allow r << imm, but the imm has to be a multiple of two.
1808 if (AM.Scale & 1) return false;
1809 return isPowerOf2_32(AM.Scale);
1816 static bool getIndexedAddressParts(SDNode *Ptr, MVT VT,
1817 bool isSEXTLoad, SDValue &Base,
1818 SDValue &Offset, bool &isInc,
1819 SelectionDAG &DAG) {
1820 if (Ptr->getOpcode() != ISD::ADD && Ptr->getOpcode() != ISD::SUB)
1823 if (VT == MVT::i16 || ((VT == MVT::i8 || VT == MVT::i1) && isSEXTLoad)) {
1825 Base = Ptr->getOperand(0);
1826 if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Ptr->getOperand(1))) {
1827 int RHSC = (int)RHS->getZExtValue();
1828 if (RHSC < 0 && RHSC > -256) {
1830 Offset = DAG.getConstant(-RHSC, RHS->getValueType(0));
1834 isInc = (Ptr->getOpcode() == ISD::ADD);
1835 Offset = Ptr->getOperand(1);
1837 } else if (VT == MVT::i32 || VT == MVT::i8 || VT == MVT::i1) {
1839 if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Ptr->getOperand(1))) {
1840 int RHSC = (int)RHS->getZExtValue();
1841 if (RHSC < 0 && RHSC > -0x1000) {
1843 Offset = DAG.getConstant(-RHSC, RHS->getValueType(0));
1844 Base = Ptr->getOperand(0);
1849 if (Ptr->getOpcode() == ISD::ADD) {
1851 ARM_AM::ShiftOpc ShOpcVal= ARM_AM::getShiftOpcForNode(Ptr->getOperand(0));
1852 if (ShOpcVal != ARM_AM::no_shift) {
1853 Base = Ptr->getOperand(1);
1854 Offset = Ptr->getOperand(0);
1856 Base = Ptr->getOperand(0);
1857 Offset = Ptr->getOperand(1);
1862 isInc = (Ptr->getOpcode() == ISD::ADD);
1863 Base = Ptr->getOperand(0);
1864 Offset = Ptr->getOperand(1);
1868 // FIXME: Use FLDM / FSTM to emulate indexed FP load / store.
1872 /// getPreIndexedAddressParts - returns true by value, base pointer and
1873 /// offset pointer and addressing mode by reference if the node's address
1874 /// can be legally represented as pre-indexed load / store address.
1876 ARMTargetLowering::getPreIndexedAddressParts(SDNode *N, SDValue &Base,
1878 ISD::MemIndexedMode &AM,
1879 SelectionDAG &DAG) const {
1880 if (Subtarget->isThumb())
1885 bool isSEXTLoad = false;
1886 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
1887 Ptr = LD->getBasePtr();
1888 VT = LD->getMemoryVT();
1889 isSEXTLoad = LD->getExtensionType() == ISD::SEXTLOAD;
1890 } else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
1891 Ptr = ST->getBasePtr();
1892 VT = ST->getMemoryVT();
1897 bool isLegal = getIndexedAddressParts(Ptr.getNode(), VT, isSEXTLoad, Base, Offset,
1900 AM = isInc ? ISD::PRE_INC : ISD::PRE_DEC;
1906 /// getPostIndexedAddressParts - returns true by value, base pointer and
1907 /// offset pointer and addressing mode by reference if this node can be
1908 /// combined with a load / store to form a post-indexed load / store.
1909 bool ARMTargetLowering::getPostIndexedAddressParts(SDNode *N, SDNode *Op,
1912 ISD::MemIndexedMode &AM,
1913 SelectionDAG &DAG) const {
1914 if (Subtarget->isThumb())
1919 bool isSEXTLoad = false;
1920 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
1921 VT = LD->getMemoryVT();
1922 isSEXTLoad = LD->getExtensionType() == ISD::SEXTLOAD;
1923 } else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
1924 VT = ST->getMemoryVT();
1929 bool isLegal = getIndexedAddressParts(Op, VT, isSEXTLoad, Base, Offset,
1932 AM = isInc ? ISD::POST_INC : ISD::POST_DEC;
1938 void ARMTargetLowering::computeMaskedBitsForTargetNode(const SDValue Op,
1942 const SelectionDAG &DAG,
1943 unsigned Depth) const {
1944 KnownZero = KnownOne = APInt(Mask.getBitWidth(), 0);
1945 switch (Op.getOpcode()) {
1947 case ARMISD::CMOV: {
1948 // Bits are known zero/one if known on the LHS and RHS.
1949 DAG.ComputeMaskedBits(Op.getOperand(0), Mask, KnownZero, KnownOne, Depth+1);
1950 if (KnownZero == 0 && KnownOne == 0) return;
1952 APInt KnownZeroRHS, KnownOneRHS;
1953 DAG.ComputeMaskedBits(Op.getOperand(1), Mask,
1954 KnownZeroRHS, KnownOneRHS, Depth+1);
1955 KnownZero &= KnownZeroRHS;
1956 KnownOne &= KnownOneRHS;
1962 //===----------------------------------------------------------------------===//
1963 // ARM Inline Assembly Support
1964 //===----------------------------------------------------------------------===//
1966 /// getConstraintType - Given a constraint letter, return the type of
1967 /// constraint it is for this target.
1968 ARMTargetLowering::ConstraintType
1969 ARMTargetLowering::getConstraintType(const std::string &Constraint) const {
1970 if (Constraint.size() == 1) {
1971 switch (Constraint[0]) {
1973 case 'l': return C_RegisterClass;
1974 case 'w': return C_RegisterClass;
1977 return TargetLowering::getConstraintType(Constraint);
1980 std::pair<unsigned, const TargetRegisterClass*>
1981 ARMTargetLowering::getRegForInlineAsmConstraint(const std::string &Constraint,
1983 if (Constraint.size() == 1) {
1984 // GCC RS6000 Constraint Letters
1985 switch (Constraint[0]) {
1987 if (Subtarget->isThumb())
1988 return std::make_pair(0U, ARM::tGPRRegisterClass);
1990 return std::make_pair(0U, ARM::GPRRegisterClass);
1992 return std::make_pair(0U, ARM::GPRRegisterClass);
1995 return std::make_pair(0U, ARM::SPRRegisterClass);
1997 return std::make_pair(0U, ARM::DPRRegisterClass);
2001 return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
2004 std::vector<unsigned> ARMTargetLowering::
2005 getRegClassForInlineAsmConstraint(const std::string &Constraint,
2007 if (Constraint.size() != 1)
2008 return std::vector<unsigned>();
2010 switch (Constraint[0]) { // GCC ARM Constraint Letters
2013 return make_vector<unsigned>(ARM::R0, ARM::R1, ARM::R2, ARM::R3,
2014 ARM::R4, ARM::R5, ARM::R6, ARM::R7,
2017 return make_vector<unsigned>(ARM::R0, ARM::R1, ARM::R2, ARM::R3,
2018 ARM::R4, ARM::R5, ARM::R6, ARM::R7,
2019 ARM::R8, ARM::R9, ARM::R10, ARM::R11,
2020 ARM::R12, ARM::LR, 0);
2023 return make_vector<unsigned>(ARM::S0, ARM::S1, ARM::S2, ARM::S3,
2024 ARM::S4, ARM::S5, ARM::S6, ARM::S7,
2025 ARM::S8, ARM::S9, ARM::S10, ARM::S11,
2026 ARM::S12,ARM::S13,ARM::S14,ARM::S15,
2027 ARM::S16,ARM::S17,ARM::S18,ARM::S19,
2028 ARM::S20,ARM::S21,ARM::S22,ARM::S23,
2029 ARM::S24,ARM::S25,ARM::S26,ARM::S27,
2030 ARM::S28,ARM::S29,ARM::S30,ARM::S31, 0);
2032 return make_vector<unsigned>(ARM::D0, ARM::D1, ARM::D2, ARM::D3,
2033 ARM::D4, ARM::D5, ARM::D6, ARM::D7,
2034 ARM::D8, ARM::D9, ARM::D10,ARM::D11,
2035 ARM::D12,ARM::D13,ARM::D14,ARM::D15, 0);
2039 return std::vector<unsigned>();
2042 /// LowerAsmOperandForConstraint - Lower the specified operand into the Ops
2043 /// vector. If it is invalid, don't add anything to Ops.
2044 void ARMTargetLowering::LowerAsmOperandForConstraint(SDValue Op,
2047 std::vector<SDValue>&Ops,
2048 SelectionDAG &DAG) const {
2049 SDValue Result(0, 0);
2051 switch (Constraint) {
2053 case 'I': case 'J': case 'K': case 'L':
2054 case 'M': case 'N': case 'O':
2055 ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op);
2059 int64_t CVal64 = C->getSExtValue();
2060 int CVal = (int) CVal64;
2061 // None of these constraints allow values larger than 32 bits. Check
2062 // that the value fits in an int.
2066 switch (Constraint) {
2068 if (Subtarget->isThumb()) {
2069 // This must be a constant between 0 and 255, for ADD immediates.
2070 if (CVal >= 0 && CVal <= 255)
2073 // A constant that can be used as an immediate value in a
2074 // data-processing instruction.
2075 if (ARM_AM::getSOImmVal(CVal) != -1)
2081 if (Subtarget->isThumb()) {
2082 // This must be a constant between -255 and -1, for negated ADD
2083 // immediates. This can be used in GCC with an "n" modifier that
2084 // prints the negated value, for use with SUB instructions. It is
2085 // not useful otherwise but is implemented for compatibility.
2086 if (CVal >= -255 && CVal <= -1)
2089 // This must be a constant between -4095 and 4095. It is not clear
2090 // what this constraint is intended for. Implemented for
2091 // compatibility with GCC.
2092 if (CVal >= -4095 && CVal <= 4095)
2098 if (Subtarget->isThumb()) {
2099 // A 32-bit value where only one byte has a nonzero value. Exclude
2100 // zero to match GCC. This constraint is used by GCC internally for
2101 // constants that can be loaded with a move/shift combination.
2102 // It is not useful otherwise but is implemented for compatibility.
2103 if (CVal != 0 && ARM_AM::isThumbImmShiftedVal(CVal))
2106 // A constant whose bitwise inverse can be used as an immediate
2107 // value in a data-processing instruction. This can be used in GCC
2108 // with a "B" modifier that prints the inverted value, for use with
2109 // BIC and MVN instructions. It is not useful otherwise but is
2110 // implemented for compatibility.
2111 if (ARM_AM::getSOImmVal(~CVal) != -1)
2117 if (Subtarget->isThumb()) {
2118 // This must be a constant between -7 and 7,
2119 // for 3-operand ADD/SUB immediate instructions.
2120 if (CVal >= -7 && CVal < 7)
2123 // A constant whose negation can be used as an immediate value in a
2124 // data-processing instruction. This can be used in GCC with an "n"
2125 // modifier that prints the negated value, for use with SUB
2126 // instructions. It is not useful otherwise but is implemented for
2128 if (ARM_AM::getSOImmVal(-CVal) != -1)
2134 if (Subtarget->isThumb()) {
2135 // This must be a multiple of 4 between 0 and 1020, for
2136 // ADD sp + immediate.
2137 if ((CVal >= 0 && CVal <= 1020) && ((CVal & 3) == 0))
2140 // A power of two or a constant between 0 and 32. This is used in
2141 // GCC for the shift amount on shifted register operands, but it is
2142 // useful in general for any shift amounts.
2143 if ((CVal >= 0 && CVal <= 32) || ((CVal & (CVal - 1)) == 0))
2149 if (Subtarget->isThumb()) {
2150 // This must be a constant between 0 and 31, for shift amounts.
2151 if (CVal >= 0 && CVal <= 31)
2157 if (Subtarget->isThumb()) {
2158 // This must be a multiple of 4 between -508 and 508, for
2159 // ADD/SUB sp = sp + immediate.
2160 if ((CVal >= -508 && CVal <= 508) && ((CVal & 3) == 0))
2165 Result = DAG.getTargetConstant(CVal, Op.getValueType());
2169 if (Result.getNode()) {
2170 Ops.push_back(Result);
2173 return TargetLowering::LowerAsmOperandForConstraint(Op, Constraint, hasMemory,