1 //===-- ARMISelLowering.cpp - ARM DAG Lowering Implementation -------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by Evan Cheng and is distributed under
6 // the University of Illinois Open Source 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/CodeGen/MachineBasicBlock.h"
27 #include "llvm/CodeGen/MachineFrameInfo.h"
28 #include "llvm/CodeGen/MachineFunction.h"
29 #include "llvm/CodeGen/MachineInstrBuilder.h"
30 #include "llvm/CodeGen/SelectionDAG.h"
31 #include "llvm/CodeGen/SSARegMap.h"
32 #include "llvm/Target/TargetOptions.h"
33 #include "llvm/ADT/VectorExtras.h"
34 #include "llvm/Support/MathExtras.h"
37 ARMTargetLowering::ARMTargetLowering(TargetMachine &TM)
38 : TargetLowering(TM), ARMPCLabelIndex(0) {
39 Subtarget = &TM.getSubtarget<ARMSubtarget>();
41 if (Subtarget->isTargetDarwin()) {
43 setLibcallName(RTLIB::UINTTOFP_I64_F32, NULL);
44 setLibcallName(RTLIB::UINTTOFP_I64_F64, NULL);
46 // Uses VFP for Thumb libfuncs if available.
47 if (Subtarget->isThumb() && Subtarget->hasVFP2()) {
48 // Single-precision floating-point arithmetic.
49 setLibcallName(RTLIB::ADD_F32, "__addsf3vfp");
50 setLibcallName(RTLIB::SUB_F32, "__subsf3vfp");
51 setLibcallName(RTLIB::MUL_F32, "__mulsf3vfp");
52 setLibcallName(RTLIB::DIV_F32, "__divsf3vfp");
54 // Double-precision floating-point arithmetic.
55 setLibcallName(RTLIB::ADD_F64, "__adddf3vfp");
56 setLibcallName(RTLIB::SUB_F64, "__subdf3vfp");
57 setLibcallName(RTLIB::MUL_F64, "__muldf3vfp");
58 setLibcallName(RTLIB::DIV_F64, "__divdf3vfp");
60 // Single-precision comparisons.
61 setLibcallName(RTLIB::OEQ_F32, "__eqsf2vfp");
62 setLibcallName(RTLIB::UNE_F32, "__nesf2vfp");
63 setLibcallName(RTLIB::OLT_F32, "__ltsf2vfp");
64 setLibcallName(RTLIB::OLE_F32, "__lesf2vfp");
65 setLibcallName(RTLIB::OGE_F32, "__gesf2vfp");
66 setLibcallName(RTLIB::OGT_F32, "__gtsf2vfp");
67 setLibcallName(RTLIB::UO_F32, "__unordsf2vfp");
68 setLibcallName(RTLIB::O_F32, "__unordsf2vfp");
70 setCmpLibcallCC(RTLIB::OEQ_F32, ISD::SETNE);
71 setCmpLibcallCC(RTLIB::UNE_F32, ISD::SETNE);
72 setCmpLibcallCC(RTLIB::OLT_F32, ISD::SETNE);
73 setCmpLibcallCC(RTLIB::OLE_F32, ISD::SETNE);
74 setCmpLibcallCC(RTLIB::OGE_F32, ISD::SETNE);
75 setCmpLibcallCC(RTLIB::OGT_F32, ISD::SETNE);
76 setCmpLibcallCC(RTLIB::UO_F32, ISD::SETNE);
77 setCmpLibcallCC(RTLIB::O_F32, ISD::SETEQ);
79 // Double-precision comparisons.
80 setLibcallName(RTLIB::OEQ_F64, "__eqdf2vfp");
81 setLibcallName(RTLIB::UNE_F64, "__nedf2vfp");
82 setLibcallName(RTLIB::OLT_F64, "__ltdf2vfp");
83 setLibcallName(RTLIB::OLE_F64, "__ledf2vfp");
84 setLibcallName(RTLIB::OGE_F64, "__gedf2vfp");
85 setLibcallName(RTLIB::OGT_F64, "__gtdf2vfp");
86 setLibcallName(RTLIB::UO_F64, "__unorddf2vfp");
87 setLibcallName(RTLIB::O_F64, "__unorddf2vfp");
89 setCmpLibcallCC(RTLIB::OEQ_F64, ISD::SETNE);
90 setCmpLibcallCC(RTLIB::UNE_F64, ISD::SETNE);
91 setCmpLibcallCC(RTLIB::OLT_F64, ISD::SETNE);
92 setCmpLibcallCC(RTLIB::OLE_F64, ISD::SETNE);
93 setCmpLibcallCC(RTLIB::OGE_F64, ISD::SETNE);
94 setCmpLibcallCC(RTLIB::OGT_F64, ISD::SETNE);
95 setCmpLibcallCC(RTLIB::UO_F64, ISD::SETNE);
96 setCmpLibcallCC(RTLIB::O_F64, ISD::SETEQ);
98 // Floating-point to integer conversions.
99 // i64 conversions are done via library routines even when generating VFP
100 // instructions, so use the same ones.
101 setLibcallName(RTLIB::FPTOSINT_F64_I32, "__fixdfsivfp");
102 setLibcallName(RTLIB::FPTOUINT_F64_I32, "__fixunsdfsivfp");
103 setLibcallName(RTLIB::FPTOSINT_F32_I32, "__fixsfsivfp");
104 setLibcallName(RTLIB::FPTOUINT_F32_I32, "__fixunssfsivfp");
106 // Conversions between floating types.
107 setLibcallName(RTLIB::FPROUND_F64_F32, "__truncdfsf2vfp");
108 setLibcallName(RTLIB::FPEXT_F32_F64, "__extendsfdf2vfp");
110 // Integer to floating-point conversions.
111 // i64 conversions are done via library routines even when generating VFP
112 // instructions, so use the same ones.
113 // FIXME: There appears to be some naming inconsistency in ARM libgcc: e.g.
114 // __floatunsidf vs. __floatunssidfvfp.
115 setLibcallName(RTLIB::SINTTOFP_I32_F64, "__floatsidfvfp");
116 setLibcallName(RTLIB::UINTTOFP_I32_F64, "__floatunssidfvfp");
117 setLibcallName(RTLIB::SINTTOFP_I32_F32, "__floatsisfvfp");
118 setLibcallName(RTLIB::UINTTOFP_I32_F32, "__floatunssisfvfp");
122 addRegisterClass(MVT::i32, ARM::GPRRegisterClass);
123 if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb()) {
124 addRegisterClass(MVT::f32, ARM::SPRRegisterClass);
125 addRegisterClass(MVT::f64, ARM::DPRRegisterClass);
128 // ARM does not have f32 extending load.
129 setLoadXAction(ISD::EXTLOAD, MVT::f32, Expand);
131 // ARM supports all 4 flavors of integer indexed load / store.
132 for (unsigned im = (unsigned)ISD::PRE_INC;
133 im != (unsigned)ISD::LAST_INDEXED_MODE; ++im) {
134 setIndexedLoadAction(im, MVT::i1, Legal);
135 setIndexedLoadAction(im, MVT::i8, Legal);
136 setIndexedLoadAction(im, MVT::i16, Legal);
137 setIndexedLoadAction(im, MVT::i32, Legal);
138 setIndexedStoreAction(im, MVT::i1, Legal);
139 setIndexedStoreAction(im, MVT::i8, Legal);
140 setIndexedStoreAction(im, MVT::i16, Legal);
141 setIndexedStoreAction(im, MVT::i32, Legal);
144 // i64 operation support.
145 if (Subtarget->isThumb()) {
146 setOperationAction(ISD::MUL, MVT::i64, Expand);
147 setOperationAction(ISD::MULHU, MVT::i32, Expand);
148 setOperationAction(ISD::MULHS, MVT::i32, Expand);
150 setOperationAction(ISD::MUL, MVT::i64, Custom);
151 setOperationAction(ISD::MULHU, MVT::i32, Custom);
152 if (!Subtarget->hasV6Ops())
153 setOperationAction(ISD::MULHS, MVT::i32, Custom);
155 setOperationAction(ISD::SHL_PARTS, MVT::i32, Expand);
156 setOperationAction(ISD::SRA_PARTS, MVT::i32, Expand);
157 setOperationAction(ISD::SRL_PARTS, MVT::i32, Expand);
158 setOperationAction(ISD::SRL, MVT::i64, Custom);
159 setOperationAction(ISD::SRA, MVT::i64, Custom);
161 // ARM does not have ROTL.
162 setOperationAction(ISD::ROTL, MVT::i32, Expand);
163 setOperationAction(ISD::CTTZ , MVT::i32, Expand);
164 setOperationAction(ISD::CTPOP, MVT::i32, Expand);
165 if (!Subtarget->hasV5TOps() || Subtarget->isThumb())
166 setOperationAction(ISD::CTLZ, MVT::i32, Expand);
168 // Only ARMv6 has BSWAP.
169 if (!Subtarget->hasV6Ops())
170 setOperationAction(ISD::BSWAP, MVT::i32, Expand);
172 // These are expanded into libcalls.
173 setOperationAction(ISD::SDIV, MVT::i32, Expand);
174 setOperationAction(ISD::UDIV, MVT::i32, Expand);
175 setOperationAction(ISD::SREM, MVT::i32, Expand);
176 setOperationAction(ISD::UREM, MVT::i32, Expand);
178 // Support label based line numbers.
179 setOperationAction(ISD::LOCATION, MVT::Other, Expand);
180 setOperationAction(ISD::DEBUG_LOC, MVT::Other, Expand);
182 setOperationAction(ISD::RET, MVT::Other, Custom);
183 setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
184 setOperationAction(ISD::ConstantPool, MVT::i32, Custom);
185 setOperationAction(ISD::GLOBAL_OFFSET_TABLE, MVT::i32, Custom);
186 setOperationAction(ISD::GlobalTLSAddress, MVT::i32, Custom);
188 // Expand mem operations genericly.
189 setOperationAction(ISD::MEMSET , MVT::Other, Expand);
190 setOperationAction(ISD::MEMCPY , MVT::Other, Expand);
191 setOperationAction(ISD::MEMMOVE , MVT::Other, Expand);
193 // Use the default implementation.
194 setOperationAction(ISD::VASTART , MVT::Other, Expand);
195 setOperationAction(ISD::VAARG , MVT::Other, Expand);
196 setOperationAction(ISD::VACOPY , MVT::Other, Expand);
197 setOperationAction(ISD::VAEND , MVT::Other, Expand);
198 setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
199 setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
200 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32 , Expand);
202 if (!Subtarget->hasV6Ops()) {
203 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i16, Expand);
204 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i8, Expand);
206 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
208 if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb())
209 // Turn f64->i64 into FMRRD iff target supports vfp2.
210 setOperationAction(ISD::BIT_CONVERT, MVT::i64, Custom);
212 setOperationAction(ISD::SETCC , MVT::i32, Expand);
213 setOperationAction(ISD::SETCC , MVT::f32, Expand);
214 setOperationAction(ISD::SETCC , MVT::f64, Expand);
215 setOperationAction(ISD::SELECT , MVT::i32, Expand);
216 setOperationAction(ISD::SELECT , MVT::f32, Expand);
217 setOperationAction(ISD::SELECT , MVT::f64, Expand);
218 setOperationAction(ISD::SELECT_CC, MVT::i32, Custom);
219 setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
220 setOperationAction(ISD::SELECT_CC, MVT::f64, Custom);
222 setOperationAction(ISD::BRCOND , MVT::Other, Expand);
223 setOperationAction(ISD::BR_CC , MVT::i32, Custom);
224 setOperationAction(ISD::BR_CC , MVT::f32, Custom);
225 setOperationAction(ISD::BR_CC , MVT::f64, Custom);
226 setOperationAction(ISD::BR_JT , MVT::Other, Custom);
228 setOperationAction(ISD::VASTART, MVT::Other, Custom);
229 setOperationAction(ISD::VACOPY, MVT::Other, Expand);
230 setOperationAction(ISD::VAEND, MVT::Other, Expand);
231 setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
232 setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
234 // FP Constants can't be immediates.
235 setOperationAction(ISD::ConstantFP, MVT::f64, Expand);
236 setOperationAction(ISD::ConstantFP, MVT::f32, Expand);
238 // We don't support sin/cos/fmod/copysign
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 setOperationAction(ISD::FCOPYSIGN, MVT::f64, Custom);
246 setOperationAction(ISD::FCOPYSIGN, MVT::f32, Custom);
248 // int <-> fp are custom expanded into bit_convert + ARMISD ops.
249 setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom);
250 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Custom);
251 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Custom);
252 setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom);
254 setStackPointerRegisterToSaveRestore(ARM::SP);
256 setSchedulingPreference(SchedulingForRegPressure);
257 computeRegisterProperties();
261 const char *ARMTargetLowering::getTargetNodeName(unsigned Opcode) const {
264 case ARMISD::Wrapper: return "ARMISD::Wrapper";
265 case ARMISD::WrapperJT: return "ARMISD::WrapperJT";
266 case ARMISD::CALL: return "ARMISD::CALL";
267 case ARMISD::CALL_NOLINK: return "ARMISD::CALL_NOLINK";
268 case ARMISD::tCALL: return "ARMISD::tCALL";
269 case ARMISD::BRCOND: return "ARMISD::BRCOND";
270 case ARMISD::BR_JT: return "ARMISD::BR_JT";
271 case ARMISD::RET_FLAG: return "ARMISD::RET_FLAG";
272 case ARMISD::PIC_ADD: return "ARMISD::PIC_ADD";
273 case ARMISD::CMP: return "ARMISD::CMP";
274 case ARMISD::CMPNZ: return "ARMISD::CMPNZ";
275 case ARMISD::CMPFP: return "ARMISD::CMPFP";
276 case ARMISD::CMPFPw0: return "ARMISD::CMPFPw0";
277 case ARMISD::FMSTAT: return "ARMISD::FMSTAT";
278 case ARMISD::CMOV: return "ARMISD::CMOV";
279 case ARMISD::CNEG: return "ARMISD::CNEG";
281 case ARMISD::FTOSI: return "ARMISD::FTOSI";
282 case ARMISD::FTOUI: return "ARMISD::FTOUI";
283 case ARMISD::SITOF: return "ARMISD::SITOF";
284 case ARMISD::UITOF: return "ARMISD::UITOF";
285 case ARMISD::MULHILOU: return "ARMISD::MULHILOU";
286 case ARMISD::MULHILOS: return "ARMISD::MULHILOS";
288 case ARMISD::SRL_FLAG: return "ARMISD::SRL_FLAG";
289 case ARMISD::SRA_FLAG: return "ARMISD::SRA_FLAG";
290 case ARMISD::RRX: return "ARMISD::RRX";
292 case ARMISD::FMRRD: return "ARMISD::FMRRD";
293 case ARMISD::FMDRR: return "ARMISD::FMDRR";
295 case ARMISD::THREAD_POINTER:return "ARMISD::THREAD_POINTER";
299 //===----------------------------------------------------------------------===//
301 //===----------------------------------------------------------------------===//
304 /// IntCCToARMCC - Convert a DAG integer condition code to an ARM CC
305 static ARMCC::CondCodes IntCCToARMCC(ISD::CondCode CC) {
307 default: assert(0 && "Unknown condition code!");
308 case ISD::SETNE: return ARMCC::NE;
309 case ISD::SETEQ: return ARMCC::EQ;
310 case ISD::SETGT: return ARMCC::GT;
311 case ISD::SETGE: return ARMCC::GE;
312 case ISD::SETLT: return ARMCC::LT;
313 case ISD::SETLE: return ARMCC::LE;
314 case ISD::SETUGT: return ARMCC::HI;
315 case ISD::SETUGE: return ARMCC::HS;
316 case ISD::SETULT: return ARMCC::LO;
317 case ISD::SETULE: return ARMCC::LS;
321 /// FPCCToARMCC - Convert a DAG fp condition code to an ARM CC. It
322 /// returns true if the operands should be inverted to form the proper
324 static bool FPCCToARMCC(ISD::CondCode CC, ARMCC::CondCodes &CondCode,
325 ARMCC::CondCodes &CondCode2) {
327 CondCode2 = ARMCC::AL;
329 default: assert(0 && "Unknown FP condition!");
331 case ISD::SETOEQ: CondCode = ARMCC::EQ; break;
333 case ISD::SETOGT: CondCode = ARMCC::GT; break;
335 case ISD::SETOGE: CondCode = ARMCC::GE; break;
336 case ISD::SETOLT: CondCode = ARMCC::MI; break;
337 case ISD::SETOLE: CondCode = ARMCC::GT; Invert = true; break;
338 case ISD::SETONE: CondCode = ARMCC::MI; CondCode2 = ARMCC::GT; break;
339 case ISD::SETO: CondCode = ARMCC::VC; break;
340 case ISD::SETUO: CondCode = ARMCC::VS; break;
341 case ISD::SETUEQ: CondCode = ARMCC::EQ; CondCode2 = ARMCC::VS; break;
342 case ISD::SETUGT: CondCode = ARMCC::HI; break;
343 case ISD::SETUGE: CondCode = ARMCC::PL; break;
345 case ISD::SETULT: CondCode = ARMCC::LT; break;
347 case ISD::SETULE: CondCode = ARMCC::LE; break;
349 case ISD::SETUNE: CondCode = ARMCC::NE; break;
355 HowToPassArgument(MVT::ValueType ObjectVT, unsigned NumGPRs,
356 unsigned StackOffset, unsigned &NeededGPRs,
357 unsigned &NeededStackSize, unsigned &GPRPad,
358 unsigned &StackPad, unsigned Flags) {
363 unsigned align = (Flags >> ISD::ParamFlags::OrigAlignmentOffs);
364 GPRPad = NumGPRs % ((align + 3)/4);
365 StackPad = StackOffset % align;
366 unsigned firstGPR = NumGPRs + GPRPad;
368 default: assert(0 && "Unhandled argument type!");
380 else if (firstGPR == 3) {
388 /// LowerCALL - Lowering a ISD::CALL node into a callseq_start <-
389 /// ARMISD:CALL <- callseq_end chain. Also add input and output parameter
391 SDOperand ARMTargetLowering::LowerCALL(SDOperand Op, SelectionDAG &DAG) {
392 MVT::ValueType RetVT= Op.Val->getValueType(0);
393 SDOperand Chain = Op.getOperand(0);
394 unsigned CallConv = cast<ConstantSDNode>(Op.getOperand(1))->getValue();
395 assert((CallConv == CallingConv::C ||
396 CallConv == CallingConv::Fast) && "unknown calling convention");
397 SDOperand Callee = Op.getOperand(4);
398 unsigned NumOps = (Op.getNumOperands() - 5) / 2;
399 unsigned ArgOffset = 0; // Frame mechanisms handle retaddr slot
400 unsigned NumGPRs = 0; // GPRs used for parameter passing.
402 // Count how many bytes are to be pushed on the stack.
403 unsigned NumBytes = 0;
405 // Add up all the space actually used.
406 for (unsigned i = 0; i < NumOps; ++i) {
411 MVT::ValueType ObjectVT = Op.getOperand(5+2*i).getValueType();
412 unsigned Flags = Op.getConstantOperandVal(5+2*i+1);
413 HowToPassArgument(ObjectVT, NumGPRs, NumBytes, ObjGPRs, ObjSize,
414 GPRPad, StackPad, Flags);
415 NumBytes += ObjSize + StackPad;
416 NumGPRs += ObjGPRs + GPRPad;
419 // Adjust the stack pointer for the new arguments...
420 // These operations are automatically eliminated by the prolog/epilog pass
421 Chain = DAG.getCALLSEQ_START(Chain,
422 DAG.getConstant(NumBytes, MVT::i32));
424 SDOperand StackPtr = DAG.getRegister(ARM::SP, MVT::i32);
426 static const unsigned GPRArgRegs[] = {
427 ARM::R0, ARM::R1, ARM::R2, ARM::R3
431 std::vector<std::pair<unsigned, SDOperand> > RegsToPass;
432 std::vector<SDOperand> MemOpChains;
433 for (unsigned i = 0; i != NumOps; ++i) {
434 SDOperand Arg = Op.getOperand(5+2*i);
435 unsigned Flags = Op.getConstantOperandVal(5+2*i+1);
436 MVT::ValueType ArgVT = Arg.getValueType();
442 HowToPassArgument(ArgVT, NumGPRs, ArgOffset, ObjGPRs,
443 ObjSize, GPRPad, StackPad, Flags);
445 ArgOffset += StackPad;
448 default: assert(0 && "Unexpected ValueType for argument!");
450 RegsToPass.push_back(std::make_pair(GPRArgRegs[NumGPRs], Arg));
453 RegsToPass.push_back(std::make_pair(GPRArgRegs[NumGPRs],
454 DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Arg)));
457 SDOperand Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Arg,
458 DAG.getConstant(0, getPointerTy()));
459 SDOperand Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Arg,
460 DAG.getConstant(1, getPointerTy()));
461 RegsToPass.push_back(std::make_pair(GPRArgRegs[NumGPRs], Lo));
463 RegsToPass.push_back(std::make_pair(GPRArgRegs[NumGPRs+1], Hi));
465 SDOperand PtrOff= DAG.getConstant(ArgOffset, StackPtr.getValueType());
466 PtrOff = DAG.getNode(ISD::ADD, MVT::i32, StackPtr, PtrOff);
467 MemOpChains.push_back(DAG.getStore(Chain, Hi, PtrOff, NULL, 0));
472 SDOperand Cvt = DAG.getNode(ARMISD::FMRRD,
473 DAG.getVTList(MVT::i32, MVT::i32),
475 RegsToPass.push_back(std::make_pair(GPRArgRegs[NumGPRs], Cvt));
477 RegsToPass.push_back(std::make_pair(GPRArgRegs[NumGPRs+1],
480 SDOperand PtrOff= DAG.getConstant(ArgOffset, StackPtr.getValueType());
481 PtrOff = DAG.getNode(ISD::ADD, MVT::i32, StackPtr, PtrOff);
482 MemOpChains.push_back(DAG.getStore(Chain, Cvt.getValue(1), PtrOff,
489 assert(ObjSize != 0);
490 SDOperand PtrOff = DAG.getConstant(ArgOffset, StackPtr.getValueType());
491 PtrOff = DAG.getNode(ISD::ADD, MVT::i32, StackPtr, PtrOff);
492 MemOpChains.push_back(DAG.getStore(Chain, Arg, PtrOff, NULL, 0));
496 ArgOffset += ObjSize;
499 if (!MemOpChains.empty())
500 Chain = DAG.getNode(ISD::TokenFactor, MVT::Other,
501 &MemOpChains[0], MemOpChains.size());
503 // Build a sequence of copy-to-reg nodes chained together with token chain
504 // and flag operands which copy the outgoing args into the appropriate regs.
506 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
507 Chain = DAG.getCopyToReg(Chain, RegsToPass[i].first, RegsToPass[i].second,
509 InFlag = Chain.getValue(1);
512 // If the callee is a GlobalAddress/ExternalSymbol node (quite common, every
513 // direct call is) turn it into a TargetGlobalAddress/TargetExternalSymbol
514 // node so that legalize doesn't hack it.
515 bool isDirect = false;
516 bool isARMFunc = false;
517 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
518 GlobalValue *GV = G->getGlobal();
520 bool isExt = (GV->isDeclaration() || GV->hasWeakLinkage() ||
521 GV->hasLinkOnceLinkage());
522 bool isStub = (isExt && Subtarget->isTargetDarwin()) &&
523 getTargetMachine().getRelocationModel() != Reloc::Static;
524 isARMFunc = !Subtarget->isThumb() || isStub;
525 // tBX takes a register source operand.
526 if (isARMFunc && Subtarget->isThumb() && !Subtarget->hasV5TOps()) {
527 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(GV, ARMPCLabelIndex,
529 SDOperand CPAddr = DAG.getTargetConstantPool(CPV, getPointerTy(), 2);
530 CPAddr = DAG.getNode(ARMISD::Wrapper, MVT::i32, CPAddr);
531 Callee = DAG.getLoad(getPointerTy(), DAG.getEntryNode(), CPAddr, NULL, 0);
532 SDOperand PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
533 Callee = DAG.getNode(ARMISD::PIC_ADD, getPointerTy(), Callee, PICLabel);
535 Callee = DAG.getTargetGlobalAddress(GV, getPointerTy());
536 } else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee)) {
538 bool isStub = Subtarget->isTargetDarwin() &&
539 getTargetMachine().getRelocationModel() != Reloc::Static;
540 isARMFunc = !Subtarget->isThumb() || isStub;
541 // tBX takes a register source operand.
542 const char *Sym = S->getSymbol();
543 if (isARMFunc && Subtarget->isThumb() && !Subtarget->hasV5TOps()) {
544 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(Sym, ARMPCLabelIndex,
546 SDOperand CPAddr = DAG.getTargetConstantPool(CPV, getPointerTy(), 2);
547 CPAddr = DAG.getNode(ARMISD::Wrapper, MVT::i32, CPAddr);
548 Callee = DAG.getLoad(getPointerTy(), DAG.getEntryNode(), CPAddr, NULL, 0);
549 SDOperand PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
550 Callee = DAG.getNode(ARMISD::PIC_ADD, getPointerTy(), Callee, PICLabel);
552 Callee = DAG.getTargetExternalSymbol(Sym, getPointerTy());
555 // FIXME: handle tail calls differently.
557 if (Subtarget->isThumb()) {
558 if (!Subtarget->hasV5TOps() && (!isDirect || isARMFunc))
559 CallOpc = ARMISD::CALL_NOLINK;
561 CallOpc = isARMFunc ? ARMISD::CALL : ARMISD::tCALL;
563 CallOpc = (isDirect || Subtarget->hasV5TOps())
564 ? ARMISD::CALL : ARMISD::CALL_NOLINK;
566 if (CallOpc == ARMISD::CALL_NOLINK && !Subtarget->isThumb()) {
567 // implicit def LR - LR mustn't be allocated as GRP:$dst of CALL_NOLINK
568 Chain = DAG.getCopyToReg(Chain, ARM::LR,
569 DAG.getNode(ISD::UNDEF, MVT::i32), InFlag);
570 InFlag = Chain.getValue(1);
573 std::vector<MVT::ValueType> NodeTys;
574 NodeTys.push_back(MVT::Other); // Returns a chain
575 NodeTys.push_back(MVT::Flag); // Returns a flag for retval copy to use.
577 std::vector<SDOperand> Ops;
578 Ops.push_back(Chain);
579 Ops.push_back(Callee);
581 // Add argument registers to the end of the list so that they are known live
583 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
584 Ops.push_back(DAG.getRegister(RegsToPass[i].first,
585 RegsToPass[i].second.getValueType()));
588 Ops.push_back(InFlag);
589 Chain = DAG.getNode(CallOpc, NodeTys, &Ops[0], Ops.size());
590 InFlag = Chain.getValue(1);
592 SDOperand CSOps[] = { Chain, DAG.getConstant(NumBytes, MVT::i32), InFlag };
593 Chain = DAG.getNode(ISD::CALLSEQ_END,
594 DAG.getNodeValueTypes(MVT::Other, MVT::Flag),
595 ((RetVT != MVT::Other) ? 2 : 1), CSOps, 3);
596 if (RetVT != MVT::Other)
597 InFlag = Chain.getValue(1);
599 std::vector<SDOperand> ResultVals;
602 // If the call has results, copy the values out of the ret val registers.
604 default: assert(0 && "Unexpected ret value!");
608 Chain = DAG.getCopyFromReg(Chain, ARM::R0, MVT::i32, InFlag).getValue(1);
609 ResultVals.push_back(Chain.getValue(0));
610 if (Op.Val->getValueType(1) == MVT::i32) {
611 // Returns a i64 value.
612 Chain = DAG.getCopyFromReg(Chain, ARM::R1, MVT::i32,
613 Chain.getValue(2)).getValue(1);
614 ResultVals.push_back(Chain.getValue(0));
615 NodeTys.push_back(MVT::i32);
617 NodeTys.push_back(MVT::i32);
620 Chain = DAG.getCopyFromReg(Chain, ARM::R0, MVT::i32, InFlag).getValue(1);
621 ResultVals.push_back(DAG.getNode(ISD::BIT_CONVERT, MVT::f32,
623 NodeTys.push_back(MVT::f32);
626 SDOperand Lo = DAG.getCopyFromReg(Chain, ARM::R0, MVT::i32, InFlag);
627 SDOperand Hi = DAG.getCopyFromReg(Lo, ARM::R1, MVT::i32, Lo.getValue(2));
628 ResultVals.push_back(DAG.getNode(ARMISD::FMDRR, MVT::f64, Lo, Hi));
629 NodeTys.push_back(MVT::f64);
634 NodeTys.push_back(MVT::Other);
636 if (ResultVals.empty())
639 ResultVals.push_back(Chain);
640 SDOperand Res = DAG.getNode(ISD::MERGE_VALUES, NodeTys, &ResultVals[0],
642 return Res.getValue(Op.ResNo);
645 static SDOperand LowerRET(SDOperand Op, SelectionDAG &DAG) {
647 SDOperand Chain = Op.getOperand(0);
648 switch(Op.getNumOperands()) {
650 assert(0 && "Do not know how to return this many arguments!");
653 SDOperand LR = DAG.getRegister(ARM::LR, MVT::i32);
654 return DAG.getNode(ARMISD::RET_FLAG, MVT::Other, Chain);
657 Op = Op.getOperand(1);
658 if (Op.getValueType() == MVT::f32) {
659 Op = DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Op);
660 } else if (Op.getValueType() == MVT::f64) {
661 // Recursively legalize f64 -> i64.
662 Op = DAG.getNode(ISD::BIT_CONVERT, MVT::i64, Op);
663 return DAG.getNode(ISD::RET, MVT::Other, Chain, Op,
664 DAG.getConstant(0, MVT::i32));
666 Copy = DAG.getCopyToReg(Chain, ARM::R0, Op, SDOperand());
667 if (DAG.getMachineFunction().liveout_empty())
668 DAG.getMachineFunction().addLiveOut(ARM::R0);
671 Copy = DAG.getCopyToReg(Chain, ARM::R1, Op.getOperand(3), SDOperand());
672 Copy = DAG.getCopyToReg(Copy, ARM::R0, Op.getOperand(1), Copy.getValue(1));
673 // If we haven't noted the R0+R1 are live out, do so now.
674 if (DAG.getMachineFunction().liveout_empty()) {
675 DAG.getMachineFunction().addLiveOut(ARM::R0);
676 DAG.getMachineFunction().addLiveOut(ARM::R1);
681 //We must use RET_FLAG instead of BRIND because BRIND doesn't have a flag
682 return DAG.getNode(ARMISD::RET_FLAG, MVT::Other, Copy, Copy.getValue(1));
685 // ConstantPool, JumpTable, GlobalAddress, and ExternalSymbol are lowered as
686 // their target countpart wrapped in the ARMISD::Wrapper node. Suppose N is
687 // one of the above mentioned nodes. It has to be wrapped because otherwise
688 // Select(N) returns N. So the raw TargetGlobalAddress nodes, etc. can only
689 // be used to form addressing mode. These wrapped nodes will be selected
691 static SDOperand LowerConstantPool(SDOperand Op, SelectionDAG &DAG) {
692 MVT::ValueType PtrVT = Op.getValueType();
693 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
695 if (CP->isMachineConstantPoolEntry())
696 Res = DAG.getTargetConstantPool(CP->getMachineCPVal(), PtrVT,
699 Res = DAG.getTargetConstantPool(CP->getConstVal(), PtrVT,
701 return DAG.getNode(ARMISD::Wrapper, MVT::i32, Res);
704 // Lower ISD::GlobalTLSAddress using the "general dynamic" model
706 ARMTargetLowering::LowerToTLSGeneralDynamicModel(GlobalAddressSDNode *GA,
708 MVT::ValueType PtrVT = getPointerTy();
709 unsigned char PCAdj = Subtarget->isThumb() ? 4 : 8;
710 ARMConstantPoolValue *CPV =
711 new ARMConstantPoolValue(GA->getGlobal(), ARMPCLabelIndex, ARMCP::CPValue,
712 PCAdj, "tlsgd", true);
713 SDOperand Argument = DAG.getTargetConstantPool(CPV, PtrVT, 2);
714 Argument = DAG.getNode(ARMISD::Wrapper, MVT::i32, Argument);
715 Argument = DAG.getLoad(PtrVT, DAG.getEntryNode(), Argument, NULL, 0);
716 SDOperand Chain = Argument.getValue(1);
718 SDOperand PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
719 Argument = DAG.getNode(ARMISD::PIC_ADD, PtrVT, Argument, PICLabel);
721 // call __tls_get_addr.
724 Entry.Node = Argument;
725 Entry.Ty = (const Type *) Type::Int32Ty;
726 Args.push_back(Entry);
727 std::pair<SDOperand, SDOperand> CallResult =
728 LowerCallTo(Chain, (const Type *) Type::Int32Ty, false, false,
729 CallingConv::C, false,
730 DAG.getExternalSymbol("__tls_get_addr", PtrVT), Args, DAG);
731 return CallResult.first;
734 // Lower ISD::GlobalTLSAddress using the "initial exec" or
735 // "local exec" model.
737 ARMTargetLowering::LowerToTLSExecModels(GlobalAddressSDNode *GA,
739 GlobalValue *GV = GA->getGlobal();
741 SDOperand Chain = DAG.getEntryNode();
742 MVT::ValueType PtrVT = getPointerTy();
743 // Get the Thread Pointer
744 SDOperand ThreadPointer = DAG.getNode(ARMISD::THREAD_POINTER, PtrVT);
746 if (GV->isDeclaration()){
747 // initial exec model
748 unsigned char PCAdj = Subtarget->isThumb() ? 4 : 8;
749 ARMConstantPoolValue *CPV =
750 new ARMConstantPoolValue(GA->getGlobal(), ARMPCLabelIndex, ARMCP::CPValue,
751 PCAdj, "gottpoff", true);
752 Offset = DAG.getTargetConstantPool(CPV, PtrVT, 2);
753 Offset = DAG.getNode(ARMISD::Wrapper, MVT::i32, Offset);
754 Offset = DAG.getLoad(PtrVT, Chain, Offset, NULL, 0);
755 Chain = Offset.getValue(1);
757 SDOperand PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
758 Offset = DAG.getNode(ARMISD::PIC_ADD, PtrVT, Offset, PICLabel);
760 Offset = DAG.getLoad(PtrVT, Chain, Offset, NULL, 0);
763 ARMConstantPoolValue *CPV =
764 new ARMConstantPoolValue(GV, ARMCP::CPValue, "tpoff");
765 Offset = DAG.getTargetConstantPool(CPV, PtrVT, 2);
766 Offset = DAG.getNode(ARMISD::Wrapper, MVT::i32, Offset);
767 Offset = DAG.getLoad(PtrVT, Chain, Offset, NULL, 0);
770 // The address of the thread local variable is the add of the thread
771 // pointer with the offset of the variable.
772 return DAG.getNode(ISD::ADD, PtrVT, ThreadPointer, Offset);
776 ARMTargetLowering::LowerGlobalTLSAddress(SDOperand Op, SelectionDAG &DAG) {
777 // TODO: implement the "local dynamic" model
778 assert(Subtarget->isTargetELF() &&
779 "TLS not implemented for non-ELF targets");
780 GlobalAddressSDNode *GA = cast<GlobalAddressSDNode>(Op);
781 // If the relocation model is PIC, use the "General Dynamic" TLS Model,
782 // otherwise use the "Local Exec" TLS Model
783 if (getTargetMachine().getRelocationModel() == Reloc::PIC_)
784 return LowerToTLSGeneralDynamicModel(GA, DAG);
786 return LowerToTLSExecModels(GA, DAG);
789 SDOperand ARMTargetLowering::LowerGlobalAddressELF(SDOperand Op,
791 MVT::ValueType PtrVT = getPointerTy();
792 GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
793 Reloc::Model RelocM = getTargetMachine().getRelocationModel();
794 if (RelocM == Reloc::PIC_) {
795 bool UseGOTOFF = GV->hasInternalLinkage() || GV->hasHiddenVisibility();
796 ARMConstantPoolValue *CPV =
797 new ARMConstantPoolValue(GV, ARMCP::CPValue, UseGOTOFF ? "GOTOFF":"GOT");
798 SDOperand CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 2);
799 CPAddr = DAG.getNode(ARMISD::Wrapper, MVT::i32, CPAddr);
800 SDOperand Result = DAG.getLoad(PtrVT, DAG.getEntryNode(), CPAddr, NULL, 0);
801 SDOperand Chain = Result.getValue(1);
802 SDOperand GOT = DAG.getNode(ISD::GLOBAL_OFFSET_TABLE, PtrVT);
803 Result = DAG.getNode(ISD::ADD, PtrVT, Result, GOT);
805 Result = DAG.getLoad(PtrVT, Chain, Result, NULL, 0);
808 SDOperand CPAddr = DAG.getTargetConstantPool(GV, PtrVT, 2);
809 CPAddr = DAG.getNode(ARMISD::Wrapper, MVT::i32, CPAddr);
810 return DAG.getLoad(PtrVT, DAG.getEntryNode(), CPAddr, NULL, 0);
814 /// GVIsIndirectSymbol - true if the GV will be accessed via an indirect symbol
815 /// even in non-static mode.
816 static bool GVIsIndirectSymbol(GlobalValue *GV, Reloc::Model RelocM) {
817 return RelocM != Reloc::Static &&
818 (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage() ||
819 (GV->isDeclaration() && !GV->hasNotBeenReadFromBytecode()));
822 SDOperand ARMTargetLowering::LowerGlobalAddressDarwin(SDOperand Op,
824 MVT::ValueType PtrVT = getPointerTy();
825 GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
826 Reloc::Model RelocM = getTargetMachine().getRelocationModel();
827 bool IsIndirect = GVIsIndirectSymbol(GV, RelocM);
829 if (RelocM == Reloc::Static)
830 CPAddr = DAG.getTargetConstantPool(GV, PtrVT, 2);
832 unsigned PCAdj = (RelocM != Reloc::PIC_)
833 ? 0 : (Subtarget->isThumb() ? 4 : 8);
834 ARMCP::ARMCPKind Kind = IsIndirect ? ARMCP::CPNonLazyPtr
836 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(GV, ARMPCLabelIndex,
838 CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 2);
840 CPAddr = DAG.getNode(ARMISD::Wrapper, MVT::i32, CPAddr);
842 SDOperand Result = DAG.getLoad(PtrVT, DAG.getEntryNode(), CPAddr, NULL, 0);
843 SDOperand Chain = Result.getValue(1);
845 if (RelocM == Reloc::PIC_) {
846 SDOperand PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
847 Result = DAG.getNode(ARMISD::PIC_ADD, PtrVT, Result, PICLabel);
850 Result = DAG.getLoad(PtrVT, Chain, Result, NULL, 0);
855 SDOperand ARMTargetLowering::LowerGLOBAL_OFFSET_TABLE(SDOperand Op,
857 assert(Subtarget->isTargetELF() &&
858 "GLOBAL OFFSET TABLE not implemented for non-ELF targets");
859 MVT::ValueType PtrVT = getPointerTy();
860 unsigned PCAdj = Subtarget->isThumb() ? 4 : 8;
861 ARMConstantPoolValue *CPV = new ARMConstantPoolValue("_GLOBAL_OFFSET_TABLE_",
863 ARMCP::CPValue, PCAdj);
864 SDOperand CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 2);
865 CPAddr = DAG.getNode(ARMISD::Wrapper, MVT::i32, CPAddr);
866 SDOperand Result = DAG.getLoad(PtrVT, DAG.getEntryNode(), CPAddr, NULL, 0);
867 SDOperand PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
868 return DAG.getNode(ARMISD::PIC_ADD, PtrVT, Result, PICLabel);
871 static SDOperand LowerVASTART(SDOperand Op, SelectionDAG &DAG,
872 unsigned VarArgsFrameIndex) {
873 // vastart just stores the address of the VarArgsFrameIndex slot into the
874 // memory location argument.
875 MVT::ValueType PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
876 SDOperand FR = DAG.getFrameIndex(VarArgsFrameIndex, PtrVT);
877 SrcValueSDNode *SV = cast<SrcValueSDNode>(Op.getOperand(2));
878 return DAG.getStore(Op.getOperand(0), FR, Op.getOperand(1), SV->getValue(),
882 static SDOperand LowerFORMAL_ARGUMENT(SDOperand Op, SelectionDAG &DAG,
883 unsigned *vRegs, unsigned ArgNo,
884 unsigned &NumGPRs, unsigned &ArgOffset) {
885 MachineFunction &MF = DAG.getMachineFunction();
886 MVT::ValueType ObjectVT = Op.getValue(ArgNo).getValueType();
887 SDOperand Root = Op.getOperand(0);
888 std::vector<SDOperand> ArgValues;
889 SSARegMap *RegMap = MF.getSSARegMap();
891 static const unsigned GPRArgRegs[] = {
892 ARM::R0, ARM::R1, ARM::R2, ARM::R3
899 unsigned Flags = Op.getConstantOperandVal(ArgNo + 3);
900 HowToPassArgument(ObjectVT, NumGPRs, ArgOffset, ObjGPRs,
901 ObjSize, GPRPad, StackPad, Flags);
903 ArgOffset += StackPad;
907 unsigned VReg = RegMap->createVirtualRegister(&ARM::GPRRegClass);
908 MF.addLiveIn(GPRArgRegs[NumGPRs], VReg);
909 vRegs[NumGPRs] = VReg;
910 ArgValue = DAG.getCopyFromReg(Root, VReg, MVT::i32);
911 if (ObjectVT == MVT::f32)
912 ArgValue = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, ArgValue);
913 } else if (ObjGPRs == 2) {
914 unsigned VReg = RegMap->createVirtualRegister(&ARM::GPRRegClass);
915 MF.addLiveIn(GPRArgRegs[NumGPRs], VReg);
916 vRegs[NumGPRs] = VReg;
917 ArgValue = DAG.getCopyFromReg(Root, VReg, MVT::i32);
919 VReg = RegMap->createVirtualRegister(&ARM::GPRRegClass);
920 MF.addLiveIn(GPRArgRegs[NumGPRs+1], VReg);
921 vRegs[NumGPRs+1] = VReg;
922 SDOperand ArgValue2 = DAG.getCopyFromReg(Root, VReg, MVT::i32);
924 if (ObjectVT == MVT::i64)
925 ArgValue = DAG.getNode(ISD::BUILD_PAIR, MVT::i64, ArgValue, ArgValue2);
927 ArgValue = DAG.getNode(ARMISD::FMDRR, MVT::f64, ArgValue, ArgValue2);
932 // If the argument is actually used, emit a load from the right stack
934 if (!Op.Val->hasNUsesOfValue(0, ArgNo)) {
935 MachineFrameInfo *MFI = MF.getFrameInfo();
936 int FI = MFI->CreateFixedObject(ObjSize, ArgOffset);
937 SDOperand FIN = DAG.getFrameIndex(FI, MVT::i32);
939 ArgValue = DAG.getLoad(ObjectVT, Root, FIN, NULL, 0);
941 SDOperand ArgValue2 =
942 DAG.getLoad(MVT::i32, Root, FIN, NULL, 0);
943 if (ObjectVT == MVT::i64)
944 ArgValue= DAG.getNode(ISD::BUILD_PAIR, MVT::i64, ArgValue, ArgValue2);
946 ArgValue= DAG.getNode(ARMISD::FMDRR, MVT::f64, ArgValue, ArgValue2);
949 // Don't emit a dead load.
950 ArgValue = DAG.getNode(ISD::UNDEF, ObjectVT);
953 ArgOffset += ObjSize; // Move on to the next argument.
960 ARMTargetLowering::LowerFORMAL_ARGUMENTS(SDOperand Op, SelectionDAG &DAG) {
961 std::vector<SDOperand> ArgValues;
962 SDOperand Root = Op.getOperand(0);
963 unsigned ArgOffset = 0; // Frame mechanisms handle retaddr slot
964 unsigned NumGPRs = 0; // GPRs used for parameter passing.
967 unsigned NumArgs = Op.Val->getNumValues()-1;
968 for (unsigned ArgNo = 0; ArgNo < NumArgs; ++ArgNo)
969 ArgValues.push_back(LowerFORMAL_ARGUMENT(Op, DAG, VRegs, ArgNo,
970 NumGPRs, ArgOffset));
972 bool isVarArg = cast<ConstantSDNode>(Op.getOperand(2))->getValue() != 0;
974 static const unsigned GPRArgRegs[] = {
975 ARM::R0, ARM::R1, ARM::R2, ARM::R3
978 MachineFunction &MF = DAG.getMachineFunction();
979 SSARegMap *RegMap = MF.getSSARegMap();
980 MachineFrameInfo *MFI = MF.getFrameInfo();
981 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
982 unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
983 unsigned VARegSize = (4 - NumGPRs) * 4;
984 unsigned VARegSaveSize = (VARegSize + Align - 1) & ~(Align - 1);
986 // If this function is vararg, store any remaining integer argument regs
987 // to their spots on the stack so that they may be loaded by deferencing
988 // the result of va_next.
989 AFI->setVarArgsRegSaveSize(VARegSaveSize);
990 VarArgsFrameIndex = MFI->CreateFixedObject(VARegSaveSize, ArgOffset +
991 VARegSaveSize - VARegSize);
992 SDOperand FIN = DAG.getFrameIndex(VarArgsFrameIndex, getPointerTy());
994 SmallVector<SDOperand, 4> MemOps;
995 for (; NumGPRs < 4; ++NumGPRs) {
996 unsigned VReg = RegMap->createVirtualRegister(&ARM::GPRRegClass);
997 MF.addLiveIn(GPRArgRegs[NumGPRs], VReg);
998 SDOperand Val = DAG.getCopyFromReg(Root, VReg, MVT::i32);
999 SDOperand Store = DAG.getStore(Val.getValue(1), Val, FIN, NULL, 0);
1000 MemOps.push_back(Store);
1001 FIN = DAG.getNode(ISD::ADD, getPointerTy(), FIN,
1002 DAG.getConstant(4, getPointerTy()));
1004 if (!MemOps.empty())
1005 Root = DAG.getNode(ISD::TokenFactor, MVT::Other,
1006 &MemOps[0], MemOps.size());
1008 // This will point to the next argument passed via stack.
1009 VarArgsFrameIndex = MFI->CreateFixedObject(4, ArgOffset);
1012 ArgValues.push_back(Root);
1014 // Return the new list of results.
1015 std::vector<MVT::ValueType> RetVT(Op.Val->value_begin(),
1016 Op.Val->value_end());
1017 return DAG.getNode(ISD::MERGE_VALUES, RetVT, &ArgValues[0], ArgValues.size());
1020 /// isFloatingPointZero - Return true if this is +0.0.
1021 static bool isFloatingPointZero(SDOperand Op) {
1022 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(Op))
1023 return CFP->isExactlyValue(0.0);
1024 else if (ISD::isEXTLoad(Op.Val) || ISD::isNON_EXTLoad(Op.Val)) {
1025 // Maybe this has already been legalized into the constant pool?
1026 if (Op.getOperand(1).getOpcode() == ARMISD::Wrapper) {
1027 SDOperand WrapperOp = Op.getOperand(1).getOperand(0);
1028 if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(WrapperOp))
1029 if (ConstantFP *CFP = dyn_cast<ConstantFP>(CP->getConstVal()))
1030 return CFP->isExactlyValue(0.0);
1036 static bool isLegalCmpImmediate(unsigned C, bool isThumb) {
1037 return ( isThumb && (C & ~255U) == 0) ||
1038 (!isThumb && ARM_AM::getSOImmVal(C) != -1);
1041 /// Returns appropriate ARM CMP (cmp) and corresponding condition code for
1042 /// the given operands.
1043 static SDOperand getARMCmp(SDOperand LHS, SDOperand RHS, ISD::CondCode CC,
1044 SDOperand &ARMCC, SelectionDAG &DAG, bool isThumb) {
1045 if (ConstantSDNode *RHSC = dyn_cast<ConstantSDNode>(RHS.Val)) {
1046 unsigned C = RHSC->getValue();
1047 if (!isLegalCmpImmediate(C, isThumb)) {
1048 // Constant does not fit, try adjusting it by one?
1053 if (isLegalCmpImmediate(C-1, isThumb)) {
1054 CC = (CC == ISD::SETLT) ? ISD::SETLE : ISD::SETGT;
1055 RHS = DAG.getConstant(C-1, MVT::i32);
1060 if (C > 0 && isLegalCmpImmediate(C-1, isThumb)) {
1061 CC = (CC == ISD::SETULT) ? ISD::SETULE : ISD::SETUGT;
1062 RHS = DAG.getConstant(C-1, MVT::i32);
1067 if (isLegalCmpImmediate(C+1, isThumb)) {
1068 CC = (CC == ISD::SETLE) ? ISD::SETLT : ISD::SETGE;
1069 RHS = DAG.getConstant(C+1, MVT::i32);
1074 if (C < 0xffffffff && isLegalCmpImmediate(C+1, isThumb)) {
1075 CC = (CC == ISD::SETULE) ? ISD::SETULT : ISD::SETUGE;
1076 RHS = DAG.getConstant(C+1, MVT::i32);
1083 ARMCC::CondCodes CondCode = IntCCToARMCC(CC);
1084 ARMISD::NodeType CompareType;
1087 CompareType = ARMISD::CMP;
1093 // Uses only N and Z Flags
1094 CompareType = ARMISD::CMPNZ;
1097 ARMCC = DAG.getConstant(CondCode, MVT::i32);
1098 return DAG.getNode(CompareType, MVT::Flag, LHS, RHS);
1101 /// Returns a appropriate VFP CMP (fcmp{s|d}+fmstat) for the given operands.
1102 static SDOperand getVFPCmp(SDOperand LHS, SDOperand RHS, SelectionDAG &DAG) {
1104 if (!isFloatingPointZero(RHS))
1105 Cmp = DAG.getNode(ARMISD::CMPFP, MVT::Flag, LHS, RHS);
1107 Cmp = DAG.getNode(ARMISD::CMPFPw0, MVT::Flag, LHS);
1108 return DAG.getNode(ARMISD::FMSTAT, MVT::Flag, Cmp);
1111 static SDOperand LowerSELECT_CC(SDOperand Op, SelectionDAG &DAG,
1112 const ARMSubtarget *ST) {
1113 MVT::ValueType VT = Op.getValueType();
1114 SDOperand LHS = Op.getOperand(0);
1115 SDOperand RHS = Op.getOperand(1);
1116 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
1117 SDOperand TrueVal = Op.getOperand(2);
1118 SDOperand FalseVal = Op.getOperand(3);
1120 if (LHS.getValueType() == MVT::i32) {
1122 SDOperand Cmp = getARMCmp(LHS, RHS, CC, ARMCC, DAG, ST->isThumb());
1123 return DAG.getNode(ARMISD::CMOV, VT, FalseVal, TrueVal, ARMCC, Cmp);
1126 ARMCC::CondCodes CondCode, CondCode2;
1127 if (FPCCToARMCC(CC, CondCode, CondCode2))
1128 std::swap(TrueVal, FalseVal);
1130 SDOperand ARMCC = DAG.getConstant(CondCode, MVT::i32);
1131 SDOperand Cmp = getVFPCmp(LHS, RHS, DAG);
1132 SDOperand Result = DAG.getNode(ARMISD::CMOV, VT, FalseVal, TrueVal,
1134 if (CondCode2 != ARMCC::AL) {
1135 SDOperand ARMCC2 = DAG.getConstant(CondCode2, MVT::i32);
1136 // FIXME: Needs another CMP because flag can have but one use.
1137 SDOperand Cmp2 = getVFPCmp(LHS, RHS, DAG);
1138 Result = DAG.getNode(ARMISD::CMOV, VT, Result, TrueVal, ARMCC2, Cmp2);
1143 static SDOperand LowerBR_CC(SDOperand Op, SelectionDAG &DAG,
1144 const ARMSubtarget *ST) {
1145 SDOperand Chain = Op.getOperand(0);
1146 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get();
1147 SDOperand LHS = Op.getOperand(2);
1148 SDOperand RHS = Op.getOperand(3);
1149 SDOperand Dest = Op.getOperand(4);
1151 if (LHS.getValueType() == MVT::i32) {
1153 SDOperand Cmp = getARMCmp(LHS, RHS, CC, ARMCC, DAG, ST->isThumb());
1154 return DAG.getNode(ARMISD::BRCOND, MVT::Other, Chain, Dest, ARMCC, Cmp);
1157 assert(LHS.getValueType() == MVT::f32 || LHS.getValueType() == MVT::f64);
1158 ARMCC::CondCodes CondCode, CondCode2;
1159 if (FPCCToARMCC(CC, CondCode, CondCode2))
1160 // Swap the LHS/RHS of the comparison if needed.
1161 std::swap(LHS, RHS);
1163 SDOperand Cmp = getVFPCmp(LHS, RHS, DAG);
1164 SDOperand ARMCC = DAG.getConstant(CondCode, MVT::i32);
1165 SDVTList VTList = DAG.getVTList(MVT::Other, MVT::Flag);
1166 SDOperand Ops[] = { Chain, Dest, ARMCC, Cmp };
1167 SDOperand Res = DAG.getNode(ARMISD::BRCOND, VTList, Ops, 4);
1168 if (CondCode2 != ARMCC::AL) {
1169 ARMCC = DAG.getConstant(CondCode2, MVT::i32);
1170 SDOperand Ops[] = { Res, Dest, ARMCC, Res.getValue(1) };
1171 Res = DAG.getNode(ARMISD::BRCOND, VTList, Ops, 4);
1176 SDOperand ARMTargetLowering::LowerBR_JT(SDOperand Op, SelectionDAG &DAG) {
1177 SDOperand Chain = Op.getOperand(0);
1178 SDOperand Table = Op.getOperand(1);
1179 SDOperand Index = Op.getOperand(2);
1181 MVT::ValueType PTy = getPointerTy();
1182 JumpTableSDNode *JT = cast<JumpTableSDNode>(Table);
1183 ARMFunctionInfo *AFI = DAG.getMachineFunction().getInfo<ARMFunctionInfo>();
1184 SDOperand UId = DAG.getConstant(AFI->createJumpTableUId(), PTy);
1185 SDOperand JTI = DAG.getTargetJumpTable(JT->getIndex(), PTy);
1186 Table = DAG.getNode(ARMISD::WrapperJT, MVT::i32, JTI, UId);
1187 Index = DAG.getNode(ISD::MUL, PTy, Index, DAG.getConstant(4, PTy));
1188 SDOperand Addr = DAG.getNode(ISD::ADD, PTy, Index, Table);
1189 bool isPIC = getTargetMachine().getRelocationModel() == Reloc::PIC_;
1190 Addr = DAG.getLoad(isPIC ? MVT::i32 : PTy, Chain, Addr, NULL, 0);
1191 Chain = Addr.getValue(1);
1193 Addr = DAG.getNode(ISD::ADD, PTy, Addr, Table);
1194 return DAG.getNode(ARMISD::BR_JT, MVT::Other, Chain, Addr, JTI, UId);
1197 static SDOperand LowerFP_TO_INT(SDOperand Op, SelectionDAG &DAG) {
1199 Op.getOpcode() == ISD::FP_TO_SINT ? ARMISD::FTOSI : ARMISD::FTOUI;
1200 Op = DAG.getNode(Opc, MVT::f32, Op.getOperand(0));
1201 return DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Op);
1204 static SDOperand LowerINT_TO_FP(SDOperand Op, SelectionDAG &DAG) {
1205 MVT::ValueType VT = Op.getValueType();
1207 Op.getOpcode() == ISD::SINT_TO_FP ? ARMISD::SITOF : ARMISD::UITOF;
1209 Op = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, Op.getOperand(0));
1210 return DAG.getNode(Opc, VT, Op);
1213 static SDOperand LowerFCOPYSIGN(SDOperand Op, SelectionDAG &DAG) {
1214 // Implement fcopysign with a fabs and a conditional fneg.
1215 SDOperand Tmp0 = Op.getOperand(0);
1216 SDOperand Tmp1 = Op.getOperand(1);
1217 MVT::ValueType VT = Op.getValueType();
1218 MVT::ValueType SrcVT = Tmp1.getValueType();
1219 SDOperand AbsVal = DAG.getNode(ISD::FABS, VT, Tmp0);
1220 SDOperand Cmp = getVFPCmp(Tmp1, DAG.getConstantFP(0.0, SrcVT), DAG);
1221 SDOperand ARMCC = DAG.getConstant(ARMCC::LT, MVT::i32);
1222 return DAG.getNode(ARMISD::CNEG, VT, AbsVal, AbsVal, ARMCC, Cmp);
1225 static SDOperand LowerBIT_CONVERT(SDOperand Op, SelectionDAG &DAG) {
1226 // Turn f64->i64 into FMRRD.
1227 assert(Op.getValueType() == MVT::i64 &&
1228 Op.getOperand(0).getValueType() == MVT::f64);
1230 Op = Op.getOperand(0);
1231 SDOperand Cvt = DAG.getNode(ARMISD::FMRRD, DAG.getVTList(MVT::i32, MVT::i32),
1234 // Merge the pieces into a single i64 value.
1235 return DAG.getNode(ISD::BUILD_PAIR, MVT::i64, Cvt, Cvt.getValue(1));
1238 static SDOperand LowerMUL(SDOperand Op, SelectionDAG &DAG) {
1239 // FIXME: All this code is target-independent. Create a new target-indep
1240 // MULHILO node and move this code to the legalizer.
1242 assert(Op.getValueType() == MVT::i64 && "Only handles i64 expand right now!");
1244 SDOperand LL = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Op.getOperand(0),
1245 DAG.getConstant(0, MVT::i32));
1246 SDOperand RL = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Op.getOperand(1),
1247 DAG.getConstant(0, MVT::i32));
1249 const TargetLowering &TL = DAG.getTargetLoweringInfo();
1250 unsigned LHSSB = TL.ComputeNumSignBits(Op.getOperand(0));
1251 unsigned RHSSB = TL.ComputeNumSignBits(Op.getOperand(1));
1254 // Figure out how to lower this multiply.
1255 if (LHSSB >= 33 && RHSSB >= 33) {
1256 // If the input values are both sign extended, we can emit a mulhs+mul.
1257 Lo = DAG.getNode(ISD::MUL, MVT::i32, LL, RL);
1258 Hi = DAG.getNode(ISD::MULHS, MVT::i32, LL, RL);
1259 } else if (LHSSB == 32 && RHSSB == 32 &&
1260 TL.MaskedValueIsZero(Op.getOperand(0), 0xFFFFFFFF00000000ULL) &&
1261 TL.MaskedValueIsZero(Op.getOperand(1), 0xFFFFFFFF00000000ULL)) {
1262 // If the inputs are zero extended, use mulhu.
1263 Lo = DAG.getNode(ISD::MUL, MVT::i32, LL, RL);
1264 Hi = DAG.getNode(ISD::MULHU, MVT::i32, LL, RL);
1266 SDOperand LH = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Op.getOperand(0),
1267 DAG.getConstant(1, MVT::i32));
1268 SDOperand RH = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Op.getOperand(1),
1269 DAG.getConstant(1, MVT::i32));
1271 // Lo,Hi = umul LHS, RHS.
1272 SDOperand Ops[] = { LL, RL };
1273 SDOperand UMul64 = DAG.getNode(ARMISD::MULHILOU,
1274 DAG.getVTList(MVT::i32, MVT::i32), Ops, 2);
1276 Hi = UMul64.getValue(1);
1277 RH = DAG.getNode(ISD::MUL, MVT::i32, LL, RH);
1278 LH = DAG.getNode(ISD::MUL, MVT::i32, LH, RL);
1279 Hi = DAG.getNode(ISD::ADD, MVT::i32, Hi, RH);
1280 Hi = DAG.getNode(ISD::ADD, MVT::i32, Hi, LH);
1283 // Merge the pieces into a single i64 value.
1284 return DAG.getNode(ISD::BUILD_PAIR, MVT::i64, Lo, Hi);
1287 static SDOperand LowerMULHU(SDOperand Op, SelectionDAG &DAG) {
1288 SDOperand Ops[] = { Op.getOperand(0), Op.getOperand(1) };
1289 return DAG.getNode(ARMISD::MULHILOU,
1290 DAG.getVTList(MVT::i32, MVT::i32), Ops, 2).getValue(1);
1293 static SDOperand LowerMULHS(SDOperand Op, SelectionDAG &DAG) {
1294 SDOperand Ops[] = { Op.getOperand(0), Op.getOperand(1) };
1295 return DAG.getNode(ARMISD::MULHILOS,
1296 DAG.getVTList(MVT::i32, MVT::i32), Ops, 2).getValue(1);
1299 static SDOperand LowerSRx(SDOperand Op, SelectionDAG &DAG,
1300 const ARMSubtarget *ST) {
1301 assert(Op.getValueType() == MVT::i64 &&
1302 (Op.getOpcode() == ISD::SRL || Op.getOpcode() == ISD::SRA) &&
1303 "Unknown shift to lower!");
1305 // We only lower SRA, SRL of 1 here, all others use generic lowering.
1306 if (!isa<ConstantSDNode>(Op.getOperand(1)) ||
1307 cast<ConstantSDNode>(Op.getOperand(1))->getValue() != 1)
1310 // If we are in thumb mode, we don't have RRX.
1311 if (ST->isThumb()) return SDOperand();
1313 // Okay, we have a 64-bit SRA or SRL of 1. Lower this to an RRX expr.
1314 SDOperand Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Op.getOperand(0),
1315 DAG.getConstant(0, MVT::i32));
1316 SDOperand Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Op.getOperand(0),
1317 DAG.getConstant(1, MVT::i32));
1319 // First, build a SRA_FLAG/SRL_FLAG op, which shifts the top part by one and
1320 // captures the result into a carry flag.
1321 unsigned Opc = Op.getOpcode() == ISD::SRL ? ARMISD::SRL_FLAG:ARMISD::SRA_FLAG;
1322 Hi = DAG.getNode(Opc, DAG.getVTList(MVT::i32, MVT::Flag), &Hi, 1);
1324 // The low part is an ARMISD::RRX operand, which shifts the carry in.
1325 Lo = DAG.getNode(ARMISD::RRX, MVT::i32, Lo, Hi.getValue(1));
1327 // Merge the pieces into a single i64 value.
1328 return DAG.getNode(ISD::BUILD_PAIR, MVT::i64, Lo, Hi);
1331 SDOperand ARMTargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
1332 switch (Op.getOpcode()) {
1333 default: assert(0 && "Don't know how to custom lower this!"); abort();
1334 case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
1335 case ISD::GlobalAddress:
1336 return Subtarget->isTargetDarwin() ? LowerGlobalAddressDarwin(Op, DAG) :
1337 LowerGlobalAddressELF(Op, DAG);
1338 case ISD::GlobalTLSAddress: return LowerGlobalTLSAddress(Op, DAG);
1339 case ISD::CALL: return LowerCALL(Op, DAG);
1340 case ISD::RET: return LowerRET(Op, DAG);
1341 case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG, Subtarget);
1342 case ISD::BR_CC: return LowerBR_CC(Op, DAG, Subtarget);
1343 case ISD::BR_JT: return LowerBR_JT(Op, DAG);
1344 case ISD::VASTART: return LowerVASTART(Op, DAG, VarArgsFrameIndex);
1345 case ISD::SINT_TO_FP:
1346 case ISD::UINT_TO_FP: return LowerINT_TO_FP(Op, DAG);
1347 case ISD::FP_TO_SINT:
1348 case ISD::FP_TO_UINT: return LowerFP_TO_INT(Op, DAG);
1349 case ISD::FCOPYSIGN: return LowerFCOPYSIGN(Op, DAG);
1350 case ISD::BIT_CONVERT: return LowerBIT_CONVERT(Op, DAG);
1351 case ISD::MUL: return LowerMUL(Op, DAG);
1352 case ISD::MULHU: return LowerMULHU(Op, DAG);
1353 case ISD::MULHS: return LowerMULHS(Op, DAG);
1355 case ISD::SRA: return LowerSRx(Op, DAG, Subtarget);
1356 case ISD::FORMAL_ARGUMENTS:
1357 return LowerFORMAL_ARGUMENTS(Op, DAG);
1358 case ISD::RETURNADDR: break;
1359 case ISD::FRAMEADDR: break;
1360 case ISD::GLOBAL_OFFSET_TABLE: return LowerGLOBAL_OFFSET_TABLE(Op, DAG);
1365 //===----------------------------------------------------------------------===//
1366 // ARM Scheduler Hooks
1367 //===----------------------------------------------------------------------===//
1370 ARMTargetLowering::InsertAtEndOfBasicBlock(MachineInstr *MI,
1371 MachineBasicBlock *BB) {
1372 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
1373 switch (MI->getOpcode()) {
1374 default: assert(false && "Unexpected instr type to insert");
1375 case ARM::tMOVCCr: {
1376 // To "insert" a SELECT_CC instruction, we actually have to insert the
1377 // diamond control-flow pattern. The incoming instruction knows the
1378 // destination vreg to set, the condition code register to branch on, the
1379 // true/false values to select between, and a branch opcode to use.
1380 const BasicBlock *LLVM_BB = BB->getBasicBlock();
1381 ilist<MachineBasicBlock>::iterator It = BB;
1387 // cmpTY ccX, r1, r2
1389 // fallthrough --> copy0MBB
1390 MachineBasicBlock *thisMBB = BB;
1391 MachineBasicBlock *copy0MBB = new MachineBasicBlock(LLVM_BB);
1392 MachineBasicBlock *sinkMBB = new MachineBasicBlock(LLVM_BB);
1393 BuildMI(BB, TII->get(ARM::tBcc)).addMBB(sinkMBB)
1394 .addImm(MI->getOperand(3).getImm());
1395 MachineFunction *F = BB->getParent();
1396 F->getBasicBlockList().insert(It, copy0MBB);
1397 F->getBasicBlockList().insert(It, sinkMBB);
1398 // Update machine-CFG edges by first adding all successors of the current
1399 // block to the new block which will contain the Phi node for the select.
1400 for(MachineBasicBlock::succ_iterator i = BB->succ_begin(),
1401 e = BB->succ_end(); i != e; ++i)
1402 sinkMBB->addSuccessor(*i);
1403 // Next, remove all successors of the current block, and add the true
1404 // and fallthrough blocks as its successors.
1405 while(!BB->succ_empty())
1406 BB->removeSuccessor(BB->succ_begin());
1407 BB->addSuccessor(copy0MBB);
1408 BB->addSuccessor(sinkMBB);
1411 // %FalseValue = ...
1412 // # fallthrough to sinkMBB
1415 // Update machine-CFG edges
1416 BB->addSuccessor(sinkMBB);
1419 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
1422 BuildMI(BB, TII->get(ARM::PHI), MI->getOperand(0).getReg())
1423 .addReg(MI->getOperand(1).getReg()).addMBB(copy0MBB)
1424 .addReg(MI->getOperand(2).getReg()).addMBB(thisMBB);
1426 delete MI; // The pseudo instruction is gone now.
1432 //===----------------------------------------------------------------------===//
1433 // ARM Optimization Hooks
1434 //===----------------------------------------------------------------------===//
1436 /// isLegalAddressImmediate - Return true if the integer value can be used
1437 /// as the offset of the target addressing mode for load / store of the
1439 static bool isLegalAddressImmediate(int64_t V, MVT::ValueType VT,
1440 const ARMSubtarget *Subtarget) {
1444 if (Subtarget->isThumb()) {
1450 default: return false;
1465 if ((V & (Scale - 1)) != 0)
1468 return V == V & ((1LL << 5) - 1);
1474 default: return false;
1479 return V == V & ((1LL << 12) - 1);
1482 return V == V & ((1LL << 8) - 1);
1485 if (!Subtarget->hasVFP2())
1490 return V == V & ((1LL << 8) - 1);
1494 /// isLegalAddressingMode - Return true if the addressing mode represented
1495 /// by AM is legal for this target, for a load/store of the specified type.
1496 bool ARMTargetLowering::isLegalAddressingMode(const AddrMode &AM,
1497 const Type *Ty) const {
1498 if (!isLegalAddressImmediate(AM.BaseOffs, getValueType(Ty), Subtarget))
1501 // Can never fold addr of global into load/store.
1506 case 0: // no scale reg, must be "r+i" or "r", or "i".
1509 if (Subtarget->isThumb())
1513 // ARM doesn't support any R+R*scale+imm addr modes.
1517 int Scale = AM.Scale;
1518 switch (getValueType(Ty)) {
1519 default: return false;
1524 // This assumes i64 is legalized to a pair of i32. If not (i.e.
1525 // ldrd / strd are used, then its address mode is same as i16.
1527 if (Scale < 0) Scale = -Scale;
1531 return isPowerOf2_32(Scale & ~1);
1534 if (((unsigned)AM.HasBaseReg + Scale) <= 2)
1539 // Note, we allow "void" uses (basically, uses that aren't loads or
1540 // stores), because arm allows folding a scale into many arithmetic
1541 // operations. This should be made more precise and revisited later.
1543 // Allow r << imm, but the imm has to be a multiple of two.
1544 if (AM.Scale & 1) return false;
1545 return isPowerOf2_32(AM.Scale);
1553 static bool getIndexedAddressParts(SDNode *Ptr, MVT::ValueType VT,
1554 bool isSEXTLoad, SDOperand &Base,
1555 SDOperand &Offset, bool &isInc,
1556 SelectionDAG &DAG) {
1557 if (Ptr->getOpcode() != ISD::ADD && Ptr->getOpcode() != ISD::SUB)
1560 if (VT == MVT::i16 || ((VT == MVT::i8 || VT == MVT::i1) && isSEXTLoad)) {
1562 Base = Ptr->getOperand(0);
1563 if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Ptr->getOperand(1))) {
1564 int RHSC = (int)RHS->getValue();
1565 if (RHSC < 0 && RHSC > -256) {
1567 Offset = DAG.getConstant(-RHSC, RHS->getValueType(0));
1571 isInc = (Ptr->getOpcode() == ISD::ADD);
1572 Offset = Ptr->getOperand(1);
1574 } else if (VT == MVT::i32 || VT == MVT::i8 || VT == MVT::i1) {
1576 if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Ptr->getOperand(1))) {
1577 int RHSC = (int)RHS->getValue();
1578 if (RHSC < 0 && RHSC > -0x1000) {
1580 Offset = DAG.getConstant(-RHSC, RHS->getValueType(0));
1581 Base = Ptr->getOperand(0);
1586 if (Ptr->getOpcode() == ISD::ADD) {
1588 ARM_AM::ShiftOpc ShOpcVal= ARM_AM::getShiftOpcForNode(Ptr->getOperand(0));
1589 if (ShOpcVal != ARM_AM::no_shift) {
1590 Base = Ptr->getOperand(1);
1591 Offset = Ptr->getOperand(0);
1593 Base = Ptr->getOperand(0);
1594 Offset = Ptr->getOperand(1);
1599 isInc = (Ptr->getOpcode() == ISD::ADD);
1600 Base = Ptr->getOperand(0);
1601 Offset = Ptr->getOperand(1);
1605 // FIXME: Use FLDM / FSTM to emulate indexed FP load / store.
1609 /// getPreIndexedAddressParts - returns true by value, base pointer and
1610 /// offset pointer and addressing mode by reference if the node's address
1611 /// can be legally represented as pre-indexed load / store address.
1613 ARMTargetLowering::getPreIndexedAddressParts(SDNode *N, SDOperand &Base,
1615 ISD::MemIndexedMode &AM,
1616 SelectionDAG &DAG) {
1617 if (Subtarget->isThumb())
1622 bool isSEXTLoad = false;
1623 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
1624 Ptr = LD->getBasePtr();
1625 VT = LD->getLoadedVT();
1626 isSEXTLoad = LD->getExtensionType() == ISD::SEXTLOAD;
1627 } else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
1628 Ptr = ST->getBasePtr();
1629 VT = ST->getStoredVT();
1634 bool isLegal = getIndexedAddressParts(Ptr.Val, VT, isSEXTLoad, Base, Offset,
1637 AM = isInc ? ISD::PRE_INC : ISD::PRE_DEC;
1643 /// getPostIndexedAddressParts - returns true by value, base pointer and
1644 /// offset pointer and addressing mode by reference if this node can be
1645 /// combined with a load / store to form a post-indexed load / store.
1646 bool ARMTargetLowering::getPostIndexedAddressParts(SDNode *N, SDNode *Op,
1649 ISD::MemIndexedMode &AM,
1650 SelectionDAG &DAG) {
1651 if (Subtarget->isThumb())
1656 bool isSEXTLoad = false;
1657 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
1658 VT = LD->getLoadedVT();
1659 isSEXTLoad = LD->getExtensionType() == ISD::SEXTLOAD;
1660 } else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
1661 VT = ST->getStoredVT();
1666 bool isLegal = getIndexedAddressParts(Op, VT, isSEXTLoad, Base, Offset,
1669 AM = isInc ? ISD::POST_INC : ISD::POST_DEC;
1675 void ARMTargetLowering::computeMaskedBitsForTargetNode(const SDOperand Op,
1677 uint64_t &KnownZero,
1679 unsigned Depth) const {
1682 switch (Op.getOpcode()) {
1684 case ARMISD::CMOV: {
1685 // Bits are known zero/one if known on the LHS and RHS.
1686 ComputeMaskedBits(Op.getOperand(0), Mask, KnownZero, KnownOne, Depth+1);
1687 if (KnownZero == 0 && KnownOne == 0) return;
1689 uint64_t KnownZeroRHS, KnownOneRHS;
1690 ComputeMaskedBits(Op.getOperand(1), Mask,
1691 KnownZeroRHS, KnownOneRHS, Depth+1);
1692 KnownZero &= KnownZeroRHS;
1693 KnownOne &= KnownOneRHS;
1699 //===----------------------------------------------------------------------===//
1700 // ARM Inline Assembly Support
1701 //===----------------------------------------------------------------------===//
1703 /// getConstraintType - Given a constraint letter, return the type of
1704 /// constraint it is for this target.
1705 ARMTargetLowering::ConstraintType
1706 ARMTargetLowering::getConstraintType(const std::string &Constraint) const {
1707 if (Constraint.size() == 1) {
1708 switch (Constraint[0]) {
1710 case 'l': return C_RegisterClass;
1711 case 'w': return C_RegisterClass;
1714 return TargetLowering::getConstraintType(Constraint);
1717 std::pair<unsigned, const TargetRegisterClass*>
1718 ARMTargetLowering::getRegForInlineAsmConstraint(const std::string &Constraint,
1719 MVT::ValueType VT) const {
1720 if (Constraint.size() == 1) {
1721 // GCC RS6000 Constraint Letters
1722 switch (Constraint[0]) {
1724 // FIXME: in thumb mode, 'l' is only low-regs.
1727 return std::make_pair(0U, ARM::GPRRegisterClass);
1730 return std::make_pair(0U, ARM::SPRRegisterClass);
1732 return std::make_pair(0U, ARM::DPRRegisterClass);
1736 return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
1739 std::vector<unsigned> ARMTargetLowering::
1740 getRegClassForInlineAsmConstraint(const std::string &Constraint,
1741 MVT::ValueType VT) const {
1742 if (Constraint.size() != 1)
1743 return std::vector<unsigned>();
1745 switch (Constraint[0]) { // GCC ARM Constraint Letters
1749 return make_vector<unsigned>(ARM::R0, ARM::R1, ARM::R2, ARM::R3,
1750 ARM::R4, ARM::R5, ARM::R6, ARM::R7,
1751 ARM::R8, ARM::R9, ARM::R10, ARM::R11,
1752 ARM::R12, ARM::LR, 0);
1755 return make_vector<unsigned>(ARM::S0, ARM::S1, ARM::S2, ARM::S3,
1756 ARM::S4, ARM::S5, ARM::S6, ARM::S7,
1757 ARM::S8, ARM::S9, ARM::S10, ARM::S11,
1758 ARM::S12,ARM::S13,ARM::S14,ARM::S15,
1759 ARM::S16,ARM::S17,ARM::S18,ARM::S19,
1760 ARM::S20,ARM::S21,ARM::S22,ARM::S23,
1761 ARM::S24,ARM::S25,ARM::S26,ARM::S27,
1762 ARM::S28,ARM::S29,ARM::S30,ARM::S31, 0);
1764 return make_vector<unsigned>(ARM::D0, ARM::D1, ARM::D2, ARM::D3,
1765 ARM::D4, ARM::D5, ARM::D6, ARM::D7,
1766 ARM::D8, ARM::D9, ARM::D10,ARM::D11,
1767 ARM::D12,ARM::D13,ARM::D14,ARM::D15, 0);
1771 return std::vector<unsigned>();