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Do NOT touch FP ops with LSR. This fixes a testcase Nate sent me from an

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inner loop like this:

LBB_RateConvertMono8AltiVec_2:  ; no_exit
        lis r2, ha16(.CPI_RateConvertMono8AltiVec_0)
        lfs f3, lo16(.CPI_RateConvertMono8AltiVec_0)(r2)
        fmr f3, f3
        fadd f0, f2, f0
        fadd f3, f0, f3
        fcmpu cr0, f3, f1
        bge cr0, LBB_RateConvertMono8AltiVec_2  ; no_exit

to an inner loop like this:

LBB_RateConvertMono8AltiVec_1:  ; no_exit
        fsub f2, f2, f1
        fcmpu cr0, f2, f1
        fmr f0, f2
        bge cr0, LBB_RateConvertMono8AltiVec_1  ; no_exit

Doh! good catch!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23838 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2005-10-20 04:47:10 +00:00
parent ae4be981b1
commit 1e9f3af561
1 changed files with 1 additions and 1 deletions
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2
lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@@ -372,7 +372,7 @@ static bool IVUseShouldUsePostIncValue(Instruction *User, Instruction *IV,
/// return true. Otherwise, return false.
bool LoopStrengthReduce::AddUsersIfInteresting(Instruction *I, Loop *L,
std::set<Instruction*> &Processed) {
if (I->getType() == Type::VoidTy) return false;
if (!I->getType()->isInteger()) return false;
if (!Processed.insert(I).second)
return true; // Instruction already handled.