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Avoid using the 'insertvalue' instruction here.

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Fast ISel isn't able to handle 'insertvalue' and it causes a large slowdown
during -O0 compilation. We don't necessarily need to generate an aggregate of
the values here if they're just going to be extracted directly afterwards.
<rdar://problem/10530851>


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146481 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2011-12-13 09:22:43 +00:00
parent 13aaca5edf
commit 4762f75251
1 changed files with 33 additions and 6 deletions
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39
lib/CodeGen/SjLjEHPrepare.cpp
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@ -69,6 +69,8 @@ namespace {
private:
bool setupEntryBlockAndCallSites(Function &F);
void substituteLPadValues(LandingPadInst *LPI, Value *ExnVal,
Value *SelVal, IRBuilder<> &Builder);
Value *setupFunctionContext(Function &F, ArrayRef<LandingPadInst*> LPads);
void lowerIncomingArguments(Function &F);
void lowerAcrossUnwindEdges(Function &F, ArrayRef<InvokeInst*> Invokes);
@ -138,6 +140,36 @@ static void MarkBlocksLiveIn(BasicBlock *BB,
MarkBlocksLiveIn(*PI, LiveBBs);
}
/// substituteLPadValues - Substitute the values returned by the landingpad
/// instruction with those returned by the personality function.
void SjLjEHPass::substituteLPadValues(LandingPadInst *LPI, Value *ExnVal,
Value *SelVal, IRBuilder<> &Builder) {
SmallVector<Value*, 8> UseWorkList(LPI->use_begin(), LPI->use_end());
while (!UseWorkList.empty()) {
Value *Val = UseWorkList.pop_back_val();
ExtractValueInst *EVI = dyn_cast<ExtractValueInst>(Val);
if (!EVI) continue;
if (EVI->getNumIndices() != 1) continue;
if (*EVI->idx_begin() == 0)
EVI->replaceAllUsesWith(ExnVal);
else if (*EVI->idx_begin() == 1)
EVI->replaceAllUsesWith(SelVal);
if (EVI->getNumUses() == 0)
EVI->eraseFromParent();
}
if (LPI->getNumUses() == 0) return;
// There are still some uses of LPI. Construct an aggregate with the exception
// values and replace the LPI with that aggregate.
Type *LPadType = LPI->getType();
Value *LPadVal = UndefValue::get(LPadType);
LPadVal = Builder.CreateInsertValue(LPadVal, ExnVal, 0, "lpad.val");
LPadVal = Builder.CreateInsertValue(LPadVal, SelVal, 1, "lpad.val");
LPI->replaceAllUsesWith(LPadVal);
}
/// setupFunctionContext - Allocate the function context on the stack and fill
/// it with all of the data that we know at this point.
Value *SjLjEHPass::
@ -189,12 +221,7 @@ setupFunctionContext(Function &F, ArrayRef<LandingPadInst*> LPads) {
ExnVal = Builder.CreateIntToPtr(ExnVal, Type::getInt8PtrTy(F.getContext()));
Value *SelVal = Builder.CreateLoad(SelectorAddr, true, "exn_selector_val");
Type *LPadType = LPI->getType();
Value *LPadVal = UndefValue::get(LPadType);
LPadVal = Builder.CreateInsertValue(LPadVal, ExnVal, 0, "lpad.val");
LPadVal = Builder.CreateInsertValue(LPadVal, SelVal, 1, "lpad.val");
LPI->replaceAllUsesWith(LPadVal);
substituteLPadValues(LPI, ExnVal, SelVal, Builder);
}
// Personality function