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Temporarily disable on-demand fast-isel.

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llvm-svn: 107393
This commit is contained in:
Dan Gohman 2010-07-01 12:15:30 +00:00
parent cf64605ccb
commit 31850f2d8b
3 changed files with 15 additions and 9 deletions
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20
lib/CodeGen/LLVMTargetMachine.cpp
View File

@ -329,15 +329,19 @@ bool LLVMTargetMachine::addCommonCodeGenPasses(PassManagerBase &PM,
if (OptLevel != CodeGenOpt::None) if (OptLevel != CodeGenOpt::None)
PM.add(createOptimizePHIsPass()); PM.add(createOptimizePHIsPass());
if (OptLevel != CodeGenOpt::None) { // Delete dead machine instructions regardless of optimization level.
// With optimization, dead code should already be eliminated. However //
// there is one known exception: lowered code for arguments that are only // At -O0, fast-isel frequently creates dead instructions.
// used by tail calls, where the tail calls reuse the incoming stack //
// arguments directly (see t11 in test/CodeGen/X86/sibcall.ll). // With optimization, dead code should already be eliminated. However
PM.add(createDeadMachineInstructionElimPass()); // there is one known exception: lowered code for arguments that are only
printAndVerify(PM, "After codegen DCE pass", // used by tail calls, where the tail calls reuse the incoming stack
/* allowDoubleDefs= */ true); // arguments directly (see t11 in test/CodeGen/X86/sibcall.ll).
PM.add(createDeadMachineInstructionElimPass());
printAndVerify(PM, "After codegen DCE pass",
/* allowDoubleDefs= */ true);
if (OptLevel != CodeGenOpt::None) {
PM.add(createOptimizeExtsPass()); PM.add(createOptimizeExtsPass());
if (!DisableMachineLICM) if (!DisableMachineLICM)
PM.add(createMachineLICMPass()); PM.add(createMachineLICMPass());

2
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -709,11 +709,13 @@ void SelectionDAGISel::SelectAllBasicBlocks(const Function &Fn) {
FastIS->startNewBlock(BB); FastIS->startNewBlock(BB);
// Do FastISel on as many instructions as possible. // Do FastISel on as many instructions as possible.
for (; BI != End; ++BI) { for (; BI != End; ++BI) {
#if 0
// Defer instructions with no side effects; they'll be emitted // Defer instructions with no side effects; they'll be emitted
// on-demand later. // on-demand later.
if (BI->isSafeToSpeculativelyExecute() && if (BI->isSafeToSpeculativelyExecute() &&
!FuncInfo->isExportedInst(BI)) !FuncInfo->isExportedInst(BI))
continue; continue;
#endif
// Try to select the instruction with FastISel. // Try to select the instruction with FastISel.
if (FastIS->SelectInstruction(BI)) if (FastIS->SelectInstruction(BI))

2
test/CodeGen/X86/fast-isel-loads.ll
View File

@ -5,7 +5,7 @@
; CHECK: foo: ; CHECK: foo:
; CHECK-NEXT: movq %rdi, -8(%rsp) ; CHECK-NEXT: movq %rdi, -8(%rsp)
; CHECK-NEXT: movq %rsi, -16(%rsp) ; CHECK-NEXT: movq %rsi, -16(%rsp)
; CHECK-NEXT: movsd 128(%rsi,%rdi,8), %xmm0 ; CHECK: movsd 128(%rsi,%rdi,8), %xmm0
; CHECK-NEXT: ret ; CHECK-NEXT: ret
define double @foo(i64 %x, double* %p) nounwind { define double @foo(i64 %x, double* %p) nounwind {