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Lower llvm.expect intrinsic correctly for i1

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LowerExpectIntrinsic previously only understood the idiom of an expect
intrinsic followed by a comparison with zero. For llvm.expect.i1, the
comparison would be stripped by the early-cse pass.

Patch by Daniel Micay.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200664 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan P. N. Exon Smith
2014-02-02 22:43:55 +00:00
parent 25b48d54c6
commit e6562c5088
3 changed files with 51 additions and 5 deletions
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23
lib/Transforms/Utils/LowerExpectIntrinsic.cpp
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@@ -94,15 +94,25 @@ bool LowerExpectIntrinsic::HandleIfExpect(BranchInst *BI) {
return false;
// Handle non-optimized IR code like:
// %expval = call i64 @llvm.expect.i64.i64(i64 %conv1, i64 1)
// %expval = call i64 @llvm.expect.i64(i64 %conv1, i64 1)
// %tobool = icmp ne i64 %expval, 0
// br i1 %tobool, label %if.then, label %if.end
//
// Or the following simpler case:
// %expval = call i1 @llvm.expect.i1(i1 %cmp, i1 1)
// br i1 %expval, label %if.then, label %if.end
CallInst *CI;
ICmpInst *CmpI = dyn_cast<ICmpInst>(BI->getCondition());
if (!CmpI || CmpI->getPredicate() != CmpInst::ICMP_NE)
return false;
if (!CmpI) {
CI = dyn_cast<CallInst>(BI->getCondition());
} else {
if (CmpI->getPredicate() != CmpInst::ICMP_NE)
return false;
CI = dyn_cast<CallInst>(CmpI->getOperand(0));
}
CallInst *CI = dyn_cast<CallInst>(CmpI->getOperand(0));
if (!CI)
return false;
@@ -127,7 +137,10 @@ bool LowerExpectIntrinsic::HandleIfExpect(BranchInst *BI) {
BI->setMetadata(LLVMContext::MD_prof, Node);
CmpI->setOperand(0, ArgValue);
if (CmpI)
CmpI->setOperand(0, ArgValue);
else
BI->setCondition(ArgValue);
return true;
}