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Fast isel no longer needs DeadMachineInstrElim to clean up after it.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107381 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2010-07-01 03:49:59 +00:00
parent 7fbcc98f20
commit a528bc0e8a
1 changed files with 8 additions and 12 deletions
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20
lib/CodeGen/LLVMTargetMachine.cpp
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@ -329,19 +329,15 @@ bool LLVMTargetMachine::addCommonCodeGenPasses(PassManagerBase &PM,
if (OptLevel != CodeGenOpt::None)
PM.add(createOptimizePHIsPass());
// Delete dead machine instructions regardless of optimization level.
//
// At -O0, fast-isel frequently creates dead instructions.
//
// With optimization, dead code should already be eliminated. However
// there is one known exception: lowered code for arguments that are only
// used by tail calls, where the tail calls reuse the incoming stack
// 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) {
// With optimization, dead code should already be eliminated. However
// there is one known exception: lowered code for arguments that are only
// used by tail calls, where the tail calls reuse the incoming stack
// arguments directly (see t11 in test/CodeGen/X86/sibcall.ll).
PM.add(createDeadMachineInstructionElimPass());
printAndVerify(PM, "After codegen DCE pass",
/* allowDoubleDefs= */ true);
PM.add(createOptimizeExtsPass());
if (!DisableMachineLICM)
PM.add(createMachineLICMPass());