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improve comment and drop a dead check. If PH had

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no uses, it would have been deleted by 
RecursivelyDeleteTriviallyDeadInstructions


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100275 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-04-03 06:16:22 +00:00
parent 9698c1985f
commit 70c0d4f7eb
1 changed files with 8 additions and 4 deletions
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12
lib/Transforms/Scalar/IndVarSimplify.cpp
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@ -759,10 +759,14 @@ void IndVarSimplify::HandleFloatingPointIV(Loop *L, PHINode *PH) {
Incr->replaceAllUsesWith(UndefValue::get(Incr->getType()));
RecursivelyDeleteTriviallyDeadInstructions(Incr);
// Replace floating induction variable, if it isn't already deleted.
// Give SIToFPInst preference over UIToFPInst because it is faster on
// platforms that are widely used.
if (WeakPH && !PH->use_empty()) {
// If the FP induction variable still has uses, this is because something else
// in the loop uses its value. In order to canonicalize the induction
// variable, we chose to eliminate the IV and rewrite it in terms of an
// int->fp cast.
//
// 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, PH->getType(), "indvar.conv",
PH->getParent()->getFirstNonPHI());