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Give SIToFPInst preference over UIToFPInst because it is faster on platforms that are widely used.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59476 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel
2008-11-18 00:40:02 +00:00
parent 2d093f3560
commit 13877bf6c2
2 changed files with 55 additions and 3 deletions
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23
lib/Transforms/Scalar/IndVarSimplify.cpp
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@@ -722,6 +722,23 @@ void IndVarSimplify::OptimizeCanonicalIVType(Loop *L) {
Incr->eraseFromParent();
}
/// Return true if it is OK to use SIToFPInst for an inducation variable
/// with given inital and exit values.
static bool useSIToFPInst(ConstantFP &InitV, ConstantFP &ExitV,
uint64_t intIV, uint64_t intEV) {
if (InitV.getValueAPF().isNegative() || ExitV.getValueAPF().isNegative())
return true;
// If the iteration range can be handled by SIToFPInst then use it.
APInt Max = APInt::getSignedMaxValue(32);
if (Max.getZExtValue() > abs(intEV - intIV))
return true;
return false;
}
/// convertToInt - Convert APF to an integer, if possible.
static bool convertToInt(const APFloat &APF, uint64_t *intVal) {
bool isExact = false;
@@ -858,9 +875,9 @@ void IndVarSimplify::HandleFloatingPointIV(Loop *L, PHINode *PH,
Incr->replaceAllUsesWith(UndefValue::get(Incr->getType()));
DeadInsts.insert(Incr);
// Replace floating induction variable.
if (EV->getValueAPF().isNegative()
|| InitValue->getValueAPF().isNegative()) {
// Replace floating induction variable. Give SIToFPInst preference over
// UIToFPInst because it is faster on platforms that are widely used.
if (useSIToFPInst(*InitValue, *EV, newInitValue, intEV)) {
SIToFPInst *Conv = new SIToFPInst(NewPHI, PH->getType(), "indvar.conv",
PH->getParent()->getFirstNonPHI());
PH->replaceAllUsesWith(Conv);