[llvm-commits] [llvm] r107381 - /llvm/trunk/lib/CodeGen/LLVMTargetMachine.cpp
Dan Gohman
gohman at apple.com
Wed Jun 30 20:49:59 PDT 2010
Author: djg
Date: Wed Jun 30 22:49:59 2010
New Revision: 107381
URL: http://llvm.org/viewvc/llvm-project?rev=107381&view=rev
Log:
Fast isel no longer needs DeadMachineInstrElim to clean up after it.
Modified:
llvm/trunk/lib/CodeGen/LLVMTargetMachine.cpp
Modified: llvm/trunk/lib/CodeGen/LLVMTargetMachine.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/LLVMTargetMachine.cpp?rev=107381&r1=107380&r2=107381&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/LLVMTargetMachine.cpp (original)
+++ llvm/trunk/lib/CodeGen/LLVMTargetMachine.cpp Wed Jun 30 22:49:59 2010
@@ -329,19 +329,15 @@
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());
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