From 00a99a35840451a291eb61a192a750908a4073ae 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. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95493 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/DeadMachineInstructionElim.cpp | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'lib/CodeGen/DeadMachineInstructionElim.cpp') diff --git a/lib/CodeGen/DeadMachineInstructionElim.cpp b/lib/CodeGen/DeadMachineInstructionElim.cpp index 9d7ec06ac9..a0544d07ba 100644 --- a/lib/CodeGen/DeadMachineInstructionElim.cpp +++ b/lib/CodeGen/DeadMachineInstructionElim.cpp @@ -11,6 +11,7 @@ // //===----------------------------------------------------------------------===// +#define DEBUG_TYPE "codegen-dce" #include "llvm/CodeGen/Passes.h" #include "llvm/Pass.h" #include "llvm/CodeGen/MachineFunctionPass.h" @@ -19,8 +20,11 @@ #include "llvm/Support/raw_ostream.h" #include "llvm/Target/TargetInstrInfo.h" #include "llvm/Target/TargetMachine.h" +#include "llvm/ADT/Statistic.h" using namespace llvm; +STATISTIC(NumDeletes, "Number of dead instructions deleted"); + namespace { class DeadMachineInstructionElim : public MachineFunctionPass { virtual bool runOnMachineFunction(MachineFunction &MF); @@ -126,6 +130,7 @@ bool DeadMachineInstructionElim::runOnMachineFunction(MachineFunction &MF) { DEBUG(dbgs() << "DeadMachineInstructionElim: DELETING: " << *MI); AnyChanges = true; MI->eraseFromParent(); + ++NumDeletes; MIE = MBB->rend(); // MII is now pointing to the next instruction to process, // so don't increment it. -- cgit v1.2.3