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Run codegen dce pass for all targets at all optimization levels. Previously it's

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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
This commit is contained in:
Evan Cheng
2010-02-06 09:07:11 +00:00
parent e3e86dce64
commit 00a99a3584
16 changed files with 83 additions and 248 deletions
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5
lib/CodeGen/DeadMachineInstructionElim.cpp
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@ -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.