From ea5c6be76664e91d8da69efb2dfc0038e93a76e4 Mon Sep 17 00:00:00 2001 From: Evan Cheng Date: Sat, 6 Feb 2010 09:07:11 +0000 Subject: Run codegen dce pass for all targets at all optimization levels. Previously it's only run for x86 with fastisel. I've found it being very effective in eliminating some obvious dead code as result of formal parameter lowering especially when tail call optimization eliminated the need for some of the loads from fixed frame objects. It also shrinks a number of the tests. A couple of tests no longer make sense and are now eliminated. llvm-svn: 95493 --- llvm/lib/CodeGen/LLVMTargetMachine.cpp | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'llvm/lib/CodeGen/LLVMTargetMachine.cpp') diff --git a/llvm/lib/CodeGen/LLVMTargetMachine.cpp b/llvm/lib/CodeGen/LLVMTargetMachine.cpp index c03e4290cab..40e015067f4 100644 --- a/llvm/lib/CodeGen/LLVMTargetMachine.cpp +++ b/llvm/lib/CodeGen/LLVMTargetMachine.cpp @@ -291,6 +291,12 @@ bool LLVMTargetMachine::addCommonCodeGenPasses(PassManagerBase &PM, printAndVerify(PM, "After Instruction Selection", /* allowDoubleDefs= */ true); + + // Delete dead machine instructions regardless of optimization level. + PM.add(createDeadMachineInstructionElimPass()); + printAndVerify(PM, "After codegen DCE pass", + /* allowDoubleDefs= */ true); + if (OptLevel != CodeGenOpt::None) { PM.add(createOptimizeExtsPass()); if (!DisableMachineLICM) -- cgit v1.2.3