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just eliminate the uitofp checks. This code isn't doing

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the required validity checks in the first place, and supporting
a condition large enough to require the 32'nd bit isn't worth it.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100280 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-04-03 06:25:21 +00:00
parent cf9abd210d
commit a40e4a0c8a
1 changed files with 5 additions and 26 deletions
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31
lib/Transforms/Scalar/IndVarSimplify.cpp
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@ -623,21 +623,6 @@ void IndVarSimplify::SinkUnusedInvariants(Loop *L) {
}
}
/// Return true if it is OK to use SIToFPInst for an induction variable
/// with given initial and exit values.
static bool CanUseSIToFP(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.
if (abs64(intEV - intIV) < INT32_MAX)
return true;
return false;
}
/// convertToInt - Convert APF to an integer, if possible.
static bool convertToInt(const APFloat &APF, uint64_t &intVal) {
bool isExact = false;
@ -720,9 +705,9 @@ void IndVarSimplify::HandleFloatingPointIV(Loop *L, PHINode *PN) {
case CmpInst::FCMP_OEQ:
case CmpInst::FCMP_UEQ: NewPred = CmpInst::ICMP_EQ; break;
case CmpInst::FCMP_OGT:
case CmpInst::FCMP_UGT: NewPred = CmpInst::ICMP_UGT; break;
case CmpInst::FCMP_UGT: NewPred = CmpInst::ICMP_SGT; break;
case CmpInst::FCMP_OGE:
case CmpInst::FCMP_UGE: NewPred = CmpInst::ICMP_UGE; break;
case CmpInst::FCMP_UGE: NewPred = CmpInst::ICMP_SGE; break;
case CmpInst::FCMP_OLT:
case CmpInst::FCMP_ULT: NewPred = CmpInst::ICMP_ULT; break;
case CmpInst::FCMP_OLE:
@ -767,15 +752,9 @@ void IndVarSimplify::HandleFloatingPointIV(Loop *L, PHINode *PN) {
// We give preference to sitofp over uitofp because it is faster on most
// platforms.
if (WeakPH) {
if (CanUseSIToFP(InitValueVal, ExitValueVal, InitValue, ExitValue)) {
SIToFPInst *Conv = new SIToFPInst(NewPHI, PN->getType(), "indvar.conv",
PN->getParent()->getFirstNonPHI());
PN->replaceAllUsesWith(Conv);
} else {
UIToFPInst *Conv = new UIToFPInst(NewPHI, PN->getType(), "indvar.conv",
PN->getParent()->getFirstNonPHI());
PN->replaceAllUsesWith(Conv);
}
Value *Conv = new SIToFPInst(NewPHI, PN->getType(), "indvar.conv",
PN->getParent()->getFirstNonPHI());
PN->replaceAllUsesWith(Conv);
RecursivelyDeleteTriviallyDeadInstructions(PN);
}