From 0b5aa1cdd3946745b54bb33902db391d41e53cd8 Mon Sep 17 00:00:00 2001 From: Dan Gohman Date: Fri, 9 Jul 2010 00:39:23 +0000 Subject: Re-apply bottom-up fast-isel, with fixes. Be very careful to avoid emitting a DBG_VALUE after a terminator, or emitting any instructions before an EH_LABEL. llvm-svn: 107943 --- llvm/lib/CodeGen/LLVMTargetMachine.cpp | 20 ++++++++------------ 1 file changed, 8 insertions(+), 12 deletions(-) (limited to 'llvm/lib/CodeGen/LLVMTargetMachine.cpp') diff --git a/llvm/lib/CodeGen/LLVMTargetMachine.cpp b/llvm/lib/CodeGen/LLVMTargetMachine.cpp index d437370031d..bf3137e4953 100644 --- a/llvm/lib/CodeGen/LLVMTargetMachine.cpp +++ b/llvm/lib/CodeGen/LLVMTargetMachine.cpp @@ -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()); -- cgit v1.2.3