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Cleanup comments and argument types related to my previous replaceCongruentPhis checkin.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147709 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2012-01-07 01:29:21 +00:00
parent b78307fc58
commit 139f333f88
1 changed files with 5 additions and 4 deletions
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9
lib/Analysis/ScalarEvolutionExpander.cpp
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@ -1558,8 +1558,8 @@ bool SCEVExpander::hoistStep(Instruction *IncV, Instruction *InsertPos,
return true;
}
/// Sort Phis by integer width for replaceCongruentIVs.
static bool width_descending(PHINode *lhs, PHINode *rhs) {
/// Sort values by integer width for replaceCongruentIVs.
static bool width_descending(Value *lhs, Value *rhs) {
// Put pointers at the back and make sure pointer < pointer = false.
if (!lhs->getType()->isIntegerTy() || !rhs->getType()->isIntegerTy())
return rhs->getType()->isIntegerTy() && !lhs->getType()->isIntegerTy();
@ -1632,8 +1632,9 @@ unsigned SCEVExpander::replaceCongruentIVs(Loop *L, const DominatorTree *DT,
// Replacing the congruent phi is sufficient because acyclic redundancy
// elimination, CSE/GVN, should handle the rest. However, once SCEV proves
// that a phi is congruent, it's often the head of an IV user cycle that
// is isomorphic with the original phi. So it's worth eagerly cleaning up
// the common case of a single IV increment.
// is isomorphic with the original phi. It's worth eagerly cleaning up the
// common case of a single IV increment so that DeleteDeadPHIs can remove
// cycles that had postinc uses.
const SCEV *TruncExpr = SE.getTruncateOrNoop(SE.getSCEV(OrigInc),
IsomorphicInc->getType());
if (OrigInc != IsomorphicInc