1 //===---- IA64ISelDAGToDAG.cpp - IA64 pattern matching inst selector ------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by Duraid Madina and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines a pattern matching instruction selector for IA64,
11 // converting a legalized dag to an IA64 dag.
13 //===----------------------------------------------------------------------===//
16 #include "IA64TargetMachine.h"
17 #include "IA64ISelLowering.h"
18 #include "llvm/CodeGen/MachineInstrBuilder.h"
19 #include "llvm/CodeGen/MachineFunction.h"
20 #include "llvm/CodeGen/SSARegMap.h"
21 #include "llvm/CodeGen/SelectionDAG.h"
22 #include "llvm/CodeGen/SelectionDAGISel.h"
23 #include "llvm/Target/TargetOptions.h"
24 #include "llvm/ADT/Statistic.h"
25 #include "llvm/Constants.h"
26 #include "llvm/GlobalValue.h"
27 #include "llvm/Support/Debug.h"
28 #include "llvm/Support/MathExtras.h"
32 Statistic<> FusedFP ("ia64-codegen", "Number of fused fp operations");
33 Statistic<> FrameOff("ia64-codegen", "Number of frame idx offsets collapsed");
35 //===--------------------------------------------------------------------===//
36 /// IA64DAGToDAGISel - IA64 specific code to select IA64 machine
37 /// instructions for SelectionDAG operations.
39 class IA64DAGToDAGISel : public SelectionDAGISel {
40 IA64TargetLowering IA64Lowering;
41 unsigned GlobalBaseReg;
43 IA64DAGToDAGISel(TargetMachine &TM)
44 : SelectionDAGISel(IA64Lowering), IA64Lowering(TM) {}
46 virtual bool runOnFunction(Function &Fn) {
47 // Make sure we re-emit a set of the global base reg if necessary
49 return SelectionDAGISel::runOnFunction(Fn);
52 /// getI64Imm - Return a target constant with the specified value, of type
54 inline SDOperand getI64Imm(uint64_t Imm) {
55 return CurDAG->getTargetConstant(Imm, MVT::i64);
58 /// getGlobalBaseReg - insert code into the entry mbb to materialize the PIC
59 /// base register. Return the virtual register that holds this value.
60 // SDOperand getGlobalBaseReg(); TODO: hmm
62 // Select - Convert the specified operand from a target-independent to a
63 // target-specific node if it hasn't already been changed.
64 SDOperand Select(SDOperand Op);
66 SDNode *SelectIntImmediateExpr(SDOperand LHS, SDOperand RHS,
67 unsigned OCHi, unsigned OCLo,
68 bool IsArithmetic = false,
70 SDNode *SelectBitfieldInsert(SDNode *N);
72 /// SelectCC - Select a comparison of the specified values with the
73 /// specified condition code, returning the CR# of the expression.
74 SDOperand SelectCC(SDOperand LHS, SDOperand RHS, ISD::CondCode CC);
76 /// SelectAddr - Given the specified address, return the two operands for a
77 /// load/store instruction, and return true if it should be an indexed [r+r]
79 bool SelectAddr(SDOperand Addr, SDOperand &Op1, SDOperand &Op2);
81 SDOperand BuildSDIVSequence(SDNode *N);
82 SDOperand BuildUDIVSequence(SDNode *N);
84 /// InstructionSelectBasicBlock - This callback is invoked by
85 /// SelectionDAGISel when it has created a SelectionDAG for us to codegen.
86 virtual void InstructionSelectBasicBlock(SelectionDAG &DAG);
88 virtual const char *getPassName() const {
89 return "IA64 (Itanium) DAG->DAG Instruction Selector";
92 // Include the pieces autogenerated from the target description.
93 #include "IA64GenDAGISel.inc"
96 SDOperand SelectDIV(SDOperand Op);
100 /// InstructionSelectBasicBlock - This callback is invoked by
101 /// SelectionDAGISel when it has created a SelectionDAG for us to codegen.
102 void IA64DAGToDAGISel::InstructionSelectBasicBlock(SelectionDAG &DAG) {
105 // The selection process is inherently a bottom-up recursive process (users
106 // select their uses before themselves). Given infinite stack space, we
107 // could just start selecting on the root and traverse the whole graph. In
108 // practice however, this causes us to run out of stack space on large basic
109 // blocks. To avoid this problem, select the entry node, then all its uses,
110 // iteratively instead of recursively.
111 std::vector<SDOperand> Worklist;
112 Worklist.push_back(DAG.getEntryNode());
114 // Note that we can do this in the IA64 target (scanning forward across token
115 // chain edges) because no nodes ever get folded across these edges. On a
116 // target like X86 which supports load/modify/store operations, this would
117 // have to be more careful.
118 while (!Worklist.empty()) {
119 SDOperand Node = Worklist.back();
122 // Chose from the least deep of the top two nodes.
123 if (!Worklist.empty() &&
124 Worklist.back().Val->getNodeDepth() < Node.Val->getNodeDepth())
125 std::swap(Worklist.back(), Node);
127 if ((Node.Val->getOpcode() >= ISD::BUILTIN_OP_END &&
128 Node.Val->getOpcode() < IA64ISD::FIRST_NUMBER) ||
129 CodeGenMap.count(Node)) continue;
131 for (SDNode::use_iterator UI = Node.Val->use_begin(),
132 E = Node.Val->use_end(); UI != E; ++UI) {
133 // Scan the values. If this use has a value that is a token chain, add it
136 for (unsigned i = 0, e = User->getNumValues(); i != e; ++i)
137 if (User->getValueType(i) == MVT::Other) {
138 Worklist.push_back(SDOperand(User, i));
143 // Finally, legalize this node.
147 // Select target instructions for the DAG.
148 DAG.setRoot(Select(DAG.getRoot()));
150 DAG.RemoveDeadNodes();
152 // Emit machine code to BB.
153 ScheduleAndEmitDAG(DAG);
156 SDOperand IA64DAGToDAGISel::SelectDIV(SDOperand Op) {
158 SDOperand Chain = Select(N->getOperand(0));
160 SDOperand Tmp1 = Select(N->getOperand(0));
161 SDOperand Tmp2 = Select(N->getOperand(1));
165 if(MVT::isFloatingPoint(Tmp1.getValueType()))
168 bool isModulus=false; // is it a division or a modulus?
171 switch(N->getOpcode()) {
173 case ISD::SDIV: isModulus=false; isSigned=true; break;
174 case ISD::UDIV: isModulus=false; isSigned=false; break;
176 case ISD::SREM: isModulus=true; isSigned=true; break;
177 case ISD::UREM: isModulus=true; isSigned=false; break;
180 // TODO: check for integer divides by powers of 2 (or other simple patterns?)
182 SDOperand TmpPR, TmpPR2;
183 SDOperand TmpF1, TmpF2, TmpF3, TmpF4, TmpF5, TmpF6, TmpF7, TmpF8;
184 SDOperand TmpF9, TmpF10,TmpF11,TmpF12,TmpF13,TmpF14,TmpF15;
187 // OK, emit some code:
190 // first, load the inputs into FP regs.
191 TmpF1 = CurDAG->getTargetNode(IA64::SETFSIG, MVT::f64, Tmp1);
192 Chain = TmpF1.getValue(1);
193 TmpF2 = CurDAG->getTargetNode(IA64::SETFSIG, MVT::f64, Tmp2);
194 Chain = TmpF2.getValue(1);
196 // next, convert the inputs to FP
198 TmpF3 = CurDAG->getTargetNode(IA64::FCVTXF, MVT::f64, TmpF1);
199 Chain = TmpF3.getValue(1);
200 TmpF4 = CurDAG->getTargetNode(IA64::FCVTXF, MVT::f64, TmpF2);
201 Chain = TmpF4.getValue(1);
203 TmpF3 = CurDAG->getTargetNode(IA64::FCVTXUFS1, MVT::f64, TmpF1);
204 Chain = TmpF3.getValue(1);
205 TmpF4 = CurDAG->getTargetNode(IA64::FCVTXUFS1, MVT::f64, TmpF2);
206 Chain = TmpF4.getValue(1);
209 } else { // this is an FP divide/remainder, so we 'leak' some temp
210 // regs and assign TmpF3=Tmp1, TmpF4=Tmp2
215 // we start by computing an approximate reciprocal (good to 9 bits?)
216 // note, this instruction writes _both_ TmpF5 (answer) and TmpPR (predicate)
217 TmpF5 = CurDAG->getTargetNode(IA64::FRCPAS1, MVT::f64, MVT::i1,
219 TmpPR = TmpF5.getValue(1);
220 Chain = TmpF5.getValue(2);
222 if(!isModulus) { // if this is a divide, we worry about div-by-zero
223 SDOperand bogusPR = CurDAG->getTargetNode(IA64::CMPEQ, MVT::i1,
224 CurDAG->getRegister(IA64::r0, MVT::i64),
225 CurDAG->getRegister(IA64::r0, MVT::i64));
226 Chain = bogusPR.getValue(1);
227 TmpPR2 = CurDAG->getTargetNode(IA64::TPCMPNE, MVT::i1, bogusPR,
228 CurDAG->getRegister(IA64::r0, MVT::i64),
229 CurDAG->getRegister(IA64::r0, MVT::i64), TmpPR);
230 Chain = TmpPR2.getValue(1);
233 SDOperand F0 = CurDAG->getRegister(IA64::F0, MVT::f64);
234 SDOperand F1 = CurDAG->getRegister(IA64::F1, MVT::f64);
236 // now we apply newton's method, thrice! (FIXME: this is ~72 bits of
237 // precision, don't need this much for f32/i32)
238 TmpF6 = CurDAG->getTargetNode(IA64::CFNMAS1, MVT::f64,
239 TmpF4, TmpF5, F1, TmpPR);
240 Chain = TmpF6.getValue(1);
241 TmpF7 = CurDAG->getTargetNode(IA64::CFMAS1, MVT::f64,
242 TmpF3, TmpF5, F0, TmpPR);
243 Chain = TmpF7.getValue(1);
244 TmpF8 = CurDAG->getTargetNode(IA64::CFMAS1, MVT::f64,
245 TmpF6, TmpF6, F0, TmpPR);
246 Chain = TmpF8.getValue(1);
247 TmpF9 = CurDAG->getTargetNode(IA64::CFMAS1, MVT::f64,
248 TmpF6, TmpF7, TmpF7, TmpPR);
249 Chain = TmpF9.getValue(1);
250 TmpF10 = CurDAG->getTargetNode(IA64::CFMAS1, MVT::f64,
251 TmpF6, TmpF5, TmpF5, TmpPR);
252 Chain = TmpF10.getValue(1);
253 TmpF11 = CurDAG->getTargetNode(IA64::CFMAS1, MVT::f64,
254 TmpF8, TmpF9, TmpF9, TmpPR);
255 Chain = TmpF11.getValue(1);
256 TmpF12 = CurDAG->getTargetNode(IA64::CFMAS1, MVT::f64,
257 TmpF8, TmpF10, TmpF10, TmpPR);
258 Chain = TmpF12.getValue(1);
259 TmpF13 = CurDAG->getTargetNode(IA64::CFNMAS1, MVT::f64,
260 TmpF4, TmpF11, TmpF3, TmpPR);
261 Chain = TmpF13.getValue(1);
263 // FIXME: this is unfortunate :(
264 // the story is that the dest reg of the fnma above and the fma below
265 // (and therefore possibly the src of the fcvt.fx[u] as well) cannot
266 // be the same register, or this code breaks if the first argument is
267 // zero. (e.g. without this hack, 0%8 yields -64, not 0.)
268 TmpF14 = CurDAG->getTargetNode(IA64::CFMAS1, MVT::f64,
269 TmpF13, TmpF12, TmpF11, TmpPR);
270 Chain = TmpF14.getValue(1);
272 if(isModulus) { // XXX: fragile! fixes _only_ mod, *breaks* div! !
273 SDOperand bogus = CurDAG->getTargetNode(IA64::IUSE, MVT::Other, TmpF13); // hack :(
274 Chain = bogus.getValue(0); // hmmm
278 // round to an integer
280 TmpF15 = CurDAG->getTargetNode(IA64::FCVTFXTRUNCS1, MVT::i64, TmpF14);
281 Chain = TmpF15.getValue(1);
284 TmpF15 = CurDAG->getTargetNode(IA64::FCVTFXUTRUNCS1, MVT::i64, TmpF14);
285 Chain = TmpF15.getValue(1);
289 // EXERCISE: can you see why TmpF15=TmpF14 does not work here, and
290 // we really do need the above FMOV? ;)
294 if(isFP) { // extra worrying about div-by-zero
295 // we do a 'conditional fmov' (of the correct result, depending
296 // on how the frcpa predicate turned out)
297 SDOperand bogoResult = CurDAG->getTargetNode(IA64::PFMOV, MVT::f64,
299 Chain = bogoResult.getValue(1);
300 Result = CurDAG->getTargetNode(IA64::CFMOV, MVT::f64, bogoResult,
302 Chain = Result.getValue(1);
305 Result = CurDAG->getTargetNode(IA64::GETFSIG, MVT::i64, TmpF15);
306 Chain = Result.getValue(1);
308 } else { // this is a modulus
310 // answer = q * (-b) + a
311 SDOperand TmpI = CurDAG->getTargetNode(IA64::SUB, MVT::i64,
312 CurDAG->getRegister(IA64::r0, MVT::i64), Tmp2);
313 Chain = TmpI.getValue(1);
314 SDOperand TmpF = CurDAG->getTargetNode(IA64::SETFSIG, MVT::f64, TmpI);
315 Chain = TmpF.getValue(1);
316 SDOperand ModulusResult = CurDAG->getTargetNode(IA64::XMAL, MVT::f64,
317 TmpF15, TmpF, TmpF1);
318 Chain = ModulusResult.getValue(1);
319 Result = CurDAG->getTargetNode(IA64::GETFSIG, MVT::i64, ModulusResult);
320 Chain = Result.getValue(1);
321 } else { // FP modulus! The horror... the horror....
322 assert(0 && "sorry, no FP modulus just yet!\n!\n");
329 // Select - Convert the specified operand from a target-independent to a
330 // target-specific node if it hasn't already been changed.
331 SDOperand IA64DAGToDAGISel::Select(SDOperand Op) {
333 if (N->getOpcode() >= ISD::BUILTIN_OP_END &&
334 N->getOpcode() < IA64ISD::FIRST_NUMBER)
335 return Op; // Already selected.
337 // If this has already been converted, use it.
338 std::map<SDOperand, SDOperand>::iterator CGMI = CodeGenMap.find(Op);
339 if (CGMI != CodeGenMap.end()) return CGMI->second;
341 switch (N->getOpcode()) {
344 case ISD::Register: return Op; // XXX: this is a hack, tblgen one day?
346 case IA64ISD::BRCALL: { // XXX: this is also a hack!
347 SDOperand Chain = Select(N->getOperand(0));
348 SDOperand InFlag; // Null incoming flag value.
350 if(N->getNumOperands()==3) // we have an incoming chain, callee and flag
351 InFlag = Select(N->getOperand(2));
354 SDOperand CallOperand;
355 std::vector<MVT::ValueType> TypeOperands;
357 // if we can call directly, do so
358 if (GlobalAddressSDNode *GASD =
359 dyn_cast<GlobalAddressSDNode>(N->getOperand(1))) {
360 CallOpcode = IA64::BRCALL_IPREL_GA;
361 CallOperand = CurDAG->getTargetGlobalAddress(GASD->getGlobal(), MVT::i64);
362 } else if (ExternalSymbolSDNode *ESSDN = // FIXME: we currently NEED this
363 // case for correctness, to avoid
364 // "non-pic code with imm reloc.n
365 // against dynamic symbol" errors
366 dyn_cast<ExternalSymbolSDNode>(N->getOperand(1))) {
367 CallOpcode = IA64::BRCALL_IPREL_ES;
368 CallOperand = N->getOperand(1);
370 // otherwise we need to load the function descriptor,
371 // load the branch target (function)'s entry point and GP,
372 // branch (call) then restore the GP
373 SDOperand FnDescriptor = Select(N->getOperand(1));
375 // load the branch target's entry point [mem] and
377 SDOperand targetEntryPoint=CurDAG->getTargetNode(IA64::LD8, MVT::i64,
379 Chain = targetEntryPoint.getValue(1);
380 SDOperand targetGPAddr=CurDAG->getTargetNode(IA64::ADDS, MVT::i64,
381 FnDescriptor, CurDAG->getConstant(8, MVT::i64));
382 Chain = targetGPAddr.getValue(1);
383 SDOperand targetGP=CurDAG->getTargetNode(IA64::LD8, MVT::i64,
385 Chain = targetGP.getValue(1);
387 Chain = CurDAG->getCopyToReg(Chain, IA64::r1, targetGP, InFlag);
388 InFlag = Chain.getValue(1);
389 Chain = CurDAG->getCopyToReg(Chain, IA64::B6, targetEntryPoint, InFlag); // FLAG these?
390 InFlag = Chain.getValue(1);
392 CallOperand = CurDAG->getRegister(IA64::B6, MVT::i64);
393 CallOpcode = IA64::BRCALL_INDIRECT;
396 // Finally, once everything is setup, emit the call itself
398 Chain = CurDAG->getTargetNode(CallOpcode, MVT::Other, MVT::Flag, CallOperand, Chain, InFlag);
399 else // there might be no arguments
400 Chain = CurDAG->getTargetNode(CallOpcode, MVT::Other, MVT::Flag, CallOperand, Chain);
401 InFlag = Chain.getValue(1);
403 std::vector<SDOperand> CallResults;
405 CallResults.push_back(Chain);
406 CallResults.push_back(InFlag);
408 for (unsigned i = 0, e = CallResults.size(); i != e; ++i)
409 CodeGenMap[Op.getValue(i)] = CallResults[i];
410 return CallResults[Op.ResNo];
413 case IA64ISD::GETFD: {
414 SDOperand Input = Select(N->getOperand(0));
415 SDOperand Result = CurDAG->getTargetNode(IA64::GETFD, MVT::i64, MVT::Flag, Input);
416 CodeGenMap[Op.getValue(0)] = Result;
417 CodeGenMap[Op.getValue(1)] = Result.getValue(1);
418 return Result.getValue(Op.ResNo);
422 case ISD::TAILCALL: { {
423 // FIXME: This is a workaround for a bug in tblgen.
424 // Pattern #47: (call:Flag (tglobaladdr:i32):$dst, ICC:Flag)
425 // Emits: (CALL:void (tglobaladdr:i32):$dst)
426 // Pattern complexity = 2 cost = 1
427 SDOperand N1 = N->getOperand(1);
428 if (N1.getOpcode() != ISD::TargetGlobalAddress &&
429 N1.getOpcode() != ISD::ExternalSymbol) goto P47Fail;
430 SDOperand InFlag = SDOperand(0, 0);
431 SDOperand Chain = N->getOperand(0);
433 Chain = Select(Chain);
435 if (N->getNumOperands() == 3) {
436 InFlag = Select(N->getOperand(2));
437 Result = CurDAG->getTargetNode(IA64::BRCALL, MVT::Other, MVT::Flag, Tmp0,
440 Result = CurDAG->getTargetNode(IA64::BRCALL, MVT::Other, MVT::Flag, Tmp0,
443 Chain = CodeGenMap[SDOperand(N, 0)] = Result.getValue(0);
444 CodeGenMap[SDOperand(N, 1)] = Result.getValue(1);
445 return Result.getValue(Op.ResNo);
455 case ISD::UREM: return SelectDIV(Op);
457 case ISD::DYNAMIC_STACKALLOC: {
458 if (!isa<ConstantSDNode>(N->getOperand(2)) ||
459 cast<ConstantSDNode>(N->getOperand(2))->getValue() != 0) {
460 std::cerr << "Cannot allocate stack object with greater alignment than"
461 << " the stack alignment yet!";
465 SDOperand Chain = Select(N->getOperand(0));
466 SDOperand Amt = Select(N->getOperand(1));
467 SDOperand Reg = CurDAG->getRegister(IA64::r12, MVT::i64);
468 SDOperand Val = CurDAG->getCopyFromReg(Chain, IA64::r12, MVT::i64);
469 Chain = Val.getValue(1);
471 // Subtract the amount (guaranteed to be a multiple of the stack alignment)
472 // from the stack pointer, giving us the result pointer.
473 SDOperand Result = Select(CurDAG->getNode(ISD::SUB, MVT::i64, Val, Amt));
475 // Copy this result back into r12.
476 Chain = CurDAG->getNode(ISD::CopyToReg, MVT::Other, Chain, Reg, Result);
478 // Copy this result back out of r12 to make sure we're not using the stack
479 // space without decrementing the stack pointer.
480 Result = CurDAG->getCopyFromReg(Chain, IA64::r12, MVT::i64);
482 // Finally, replace the DYNAMIC_STACKALLOC with the copyfromreg.
483 CodeGenMap[Op.getValue(0)] = Result;
484 CodeGenMap[Op.getValue(1)] = Result.getValue(1);
485 return SDOperand(Result.Val, Op.ResNo);
488 case ISD::ConstantFP: {
489 SDOperand Chain = CurDAG->getEntryNode(); // this is a constant, so..
491 if (cast<ConstantFPSDNode>(N)->isExactlyValue(+0.0))
492 return CurDAG->getCopyFromReg(Chain, IA64::F0, MVT::f64);
493 else if (cast<ConstantFPSDNode>(N)->isExactlyValue(+1.0))
494 return CurDAG->getCopyFromReg(Chain, IA64::F1, MVT::f64);
496 assert(0 && "Unexpected FP constant!");
499 case ISD::FrameIndex: { // TODO: reduce creepyness
500 int FI = cast<FrameIndexSDNode>(N)->getIndex();
502 return CurDAG->SelectNodeTo(N, IA64::MOV, MVT::i64,
503 CurDAG->getTargetFrameIndex(FI, MVT::i64));
504 return CurDAG->getTargetNode(IA64::MOV, MVT::i64,
505 CurDAG->getTargetFrameIndex(FI, MVT::i64));
508 case ISD::ConstantPool: {
509 Constant *C = cast<ConstantPoolSDNode>(N)->get();
510 SDOperand CPI = CurDAG->getTargetConstantPool(C, MVT::i64);
511 return CurDAG->getTargetNode(IA64::ADDL_GA, MVT::i64, // ?
512 CurDAG->getRegister(IA64::r1, MVT::i64), CPI);
515 case ISD::GlobalAddress: {
516 GlobalValue *GV = cast<GlobalAddressSDNode>(N)->getGlobal();
517 SDOperand GA = CurDAG->getTargetGlobalAddress(GV, MVT::i64);
518 SDOperand Tmp = CurDAG->getTargetNode(IA64::ADDL_GA, MVT::i64,
519 CurDAG->getRegister(IA64::r1, MVT::i64), GA);
520 return CurDAG->getTargetNode(IA64::LD8, MVT::i64, Tmp);
523 /* XXX case ISD::ExternalSymbol: {
524 SDOperand EA = CurDAG->getTargetExternalSymbol(cast<ExternalSymbolSDNode>(N)->getSymbol(),
526 SDOperand Tmp = CurDAG->getTargetNode(IA64::ADDL_EA, MVT::i64,
527 CurDAG->getRegister(IA64::r1, MVT::i64), EA);
528 return CurDAG->getTargetNode(IA64::LD8, MVT::i64, Tmp);
534 case ISD::ZEXTLOAD: {
535 SDOperand Chain = Select(N->getOperand(0));
536 SDOperand Address = Select(N->getOperand(1));
538 MVT::ValueType TypeBeingLoaded = (N->getOpcode() == ISD::LOAD) ?
539 N->getValueType(0) : cast<VTSDNode>(N->getOperand(3))->getVT();
541 switch (TypeBeingLoaded) {
542 default: N->dump(); assert(0 && "Cannot load this type!");
543 case MVT::i1: { // this is a bool
544 Opc = IA64::LD1; // first we load a byte, then compare for != 0
545 if(N->getValueType(0) == MVT::i1) // XXX: early exit!
546 return CurDAG->SelectNodeTo(N, IA64::CMPNE, MVT::i1, MVT::Other,
547 CurDAG->getTargetNode(Opc, MVT::i64, Address),
548 CurDAG->getRegister(IA64::r0, MVT::i64),
549 Chain).getValue(Op.ResNo);
550 /* otherwise, we want to load a bool into something bigger: LD1
551 will do that for us, so we just fall through */
553 case MVT::i8: Opc = IA64::LD1; break;
554 case MVT::i16: Opc = IA64::LD2; break;
555 case MVT::i32: Opc = IA64::LD4; break;
556 case MVT::i64: Opc = IA64::LD8; break;
558 case MVT::f32: Opc = IA64::LDF4; break;
559 case MVT::f64: Opc = IA64::LDF8; break;
562 // TODO: comment this
563 return CurDAG->SelectNodeTo(N, Opc, N->getValueType(0), MVT::Other,
564 Address, Chain).getValue(Op.ResNo);
567 case ISD::TRUNCSTORE:
569 SDOperand Address = Select(N->getOperand(2));
570 SDOperand Chain = Select(N->getOperand(0));
573 if (N->getOpcode() == ISD::STORE) {
574 switch (N->getOperand(1).getValueType()) {
575 default: assert(0 && "unknown type in store");
576 case MVT::i1: { // this is a bool
577 Opc = IA64::ST1; // we store either 0 or 1 as a byte
579 CurDAG->getTargetNode(IA64::PADDS, MVT::i64,
580 CurDAG->getRegister(IA64::r0, MVT::i64),
581 CurDAG->getConstant(1, MVT::i64),
582 Select(N->getOperand(1)));
583 return CurDAG->SelectNodeTo(N, Opc, MVT::Other, Address, Tmp, Chain);
585 case MVT::i64: Opc = IA64::ST8; break;
586 case MVT::f64: Opc = IA64::STF8; break;
588 } else { //ISD::TRUNCSTORE
589 switch(cast<VTSDNode>(N->getOperand(4))->getVT()) {
590 default: assert(0 && "unknown type in truncstore");
591 case MVT::i8: Opc = IA64::ST1; break;
592 case MVT::i16: Opc = IA64::ST2; break;
593 case MVT::i32: Opc = IA64::ST4; break;
594 case MVT::f32: Opc = IA64::STF4; break;
598 return CurDAG->SelectNodeTo(N, Opc, MVT::Other, Select(N->getOperand(2)),
599 Select(N->getOperand(1)), Chain);
603 SDOperand Chain = Select(N->getOperand(0));
604 SDOperand CC = Select(N->getOperand(1));
605 MachineBasicBlock *Dest =
606 cast<BasicBlockSDNode>(N->getOperand(2))->getBasicBlock();
607 //FIXME - we do NOT need long branches all the time
608 return CurDAG->SelectNodeTo(N, IA64::BRLCOND_NOTCALL, MVT::Other, CC,
609 CurDAG->getBasicBlock(Dest), Chain);
612 case ISD::CALLSEQ_START:
613 case ISD::CALLSEQ_END: {
614 int64_t Amt = cast<ConstantSDNode>(N->getOperand(1))->getValue();
615 unsigned Opc = N->getOpcode() == ISD::CALLSEQ_START ?
616 IA64::ADJUSTCALLSTACKDOWN : IA64::ADJUSTCALLSTACKUP;
617 return CurDAG->SelectNodeTo(N, Opc, MVT::Other,
618 getI64Imm(Amt), Select(N->getOperand(0)));
622 SDOperand Chain = Select(N->getOperand(0)); // Token chain.
625 switch (N->getNumOperands()) {
627 assert(0 && "Unknown return instruction!");
629 SDOperand RetVal = Select(N->getOperand(1));
630 switch (RetVal.getValueType()) {
631 default: assert(0 && "I don't know how to return this type! (promote?)");
632 // FIXME: do I need to add support for bools here?
633 // (return '0' or '1' in r8, basically...)
635 // FIXME: need to round floats - 80 bits is bad, the tester
638 // we mark r8 as live on exit up above in LowerArguments()
639 // BuildMI(BB, IA64::MOV, 1, IA64::r8).addReg(Tmp1);
640 Chain = CurDAG->getCopyToReg(Chain, IA64::r8, RetVal);
641 InFlag = Chain.getValue(1);
644 // we mark F8 as live on exit up above in LowerArguments()
645 // BuildMI(BB, IA64::FMOV, 1, IA64::F8).addReg(Tmp1);
646 Chain = CurDAG->getCopyToReg(Chain, IA64::F8, RetVal);
647 InFlag = Chain.getValue(1);
656 // we need to copy VirtGPR (the vreg (to become a real reg)) that holds
657 // the output of this function's alloc instruction back into ar.pfs
658 // before we return. this copy must not float up above the last
659 // outgoing call in this function!!!
660 SDOperand AR_PFSVal = CurDAG->getCopyFromReg(Chain, IA64Lowering.VirtGPR,
662 Chain = AR_PFSVal.getValue(1);
663 Chain = CurDAG->getCopyToReg(Chain, IA64::AR_PFS, AR_PFSVal);
665 // and then just emit a 'ret' instruction
666 // before returning, restore the ar.pfs register (set by the 'alloc' up top)
667 // BuildMI(BB, IA64::MOV, 1).addReg(IA64::AR_PFS).addReg(IA64Lowering.VirtGPR);
669 return CurDAG->SelectNodeTo(N, IA64::RET, MVT::Other, Chain);
673 // FIXME: we don't need long branches all the time!
674 return CurDAG->SelectNodeTo(N, IA64::BRL_NOTCALL, MVT::Other,
675 N->getOperand(1), Select(N->getOperand(0)));
678 return SelectCode(Op);
682 /// createIA64DAGToDAGInstructionSelector - This pass converts a legalized DAG
683 /// into an IA64-specific DAG, ready for instruction scheduling.
685 FunctionPass *llvm::createIA64DAGToDAGInstructionSelector(TargetMachine &TM) {
686 return new IA64DAGToDAGISel(TM);