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Make more passes preserve dominators (or state that they preserve dominators if

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they all ready do). This removes two dominator recomputations prior to isel,
which is a 1% improvement in total llc time for 403.gcc.

The only potentially suspect thing is making GCStrategy recompute dominators if
it used a custom lowering strategy.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123064 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Cameron Zwarich
2011-01-08 17:01:52 +00:00
parent bea4626f93
commit 80f6a507d4
5 changed files with 49 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
lib/CodeGen/GCStrategy.cpp
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@ -19,6 +19,7 @@
#include "llvm/CodeGen/Passes.h"
#include "llvm/IntrinsicInst.h"
#include "llvm/Module.h"
#include "llvm/Analysis/Dominators.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
@ -146,6 +147,7 @@ const char *LowerIntrinsics::getPassName() const {
void LowerIntrinsics::getAnalysisUsage(AnalysisUsage &AU) const {
FunctionPass::getAnalysisUsage(AU);
AU.addRequired<GCModuleInfo>();
AU.addPreserved<DominatorTree>();
}
/// doInitialization - If this module uses the GC intrinsics, find them now.
@ -256,9 +258,16 @@ bool LowerIntrinsics::runOnFunction(Function &F) {
if (NeedsDefaultLoweringPass(S))
MadeChange |= PerformDefaultLowering(F, S);
if (NeedsCustomLoweringPass(S))
bool UseCustomLoweringPass = NeedsCustomLoweringPass(S);
if (UseCustomLoweringPass)
MadeChange |= S.performCustomLowering(F);
// Custom lowering may modify the CFG, so dominators must be recomputed.
if (UseCustomLoweringPass) {
if (DominatorTree *DT = getAnalysisIfAvailable<DominatorTree>())
DT->DT->recalculate(F);
}
return MadeChange;
}