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cleanup: misleading comment.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134010 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2011-06-28 16:45:04 +00:00
parent 8d4386efb7
commit 99a92f67c7
1 changed files with 2 additions and 2 deletions
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4
lib/Transforms/Scalar/IndVarSimplify.cpp
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@ -1085,7 +1085,7 @@ void IndVarSimplify::SimplifyIVUsersNoRewrite(Loop *L, SCEVExpander &Rewriter) {
// simplification on the wide IVs. // simplification on the wide IVs.
while (!LoopPhis.empty()) { while (!LoopPhis.empty()) {
// Evaluate as many IV expressions as possible before widening any IVs. This // Evaluate as many IV expressions as possible before widening any IVs. This
// forces SCEV to propagate no-wrap flags before evaluating sign/zero // forces SCEV to set no-wrap flags before evaluating sign/zero
// extension. The first time SCEV attempts to normalize sign/zero extension, // extension. The first time SCEV attempts to normalize sign/zero extension,
// the result becomes final. So for the most predictable results, we delay // the result becomes final. So for the most predictable results, we delay
// evaluation of sign/zero extend evaluation until needed, and avoid running // evaluation of sign/zero extend evaluation until needed, and avoid running
@ -1176,7 +1176,7 @@ bool IndVarSimplify::runOnLoop(Loop *L, LPPassManager &LPM) {
// Simplification works best when run before other consumers of SCEV. We // Simplification works best when run before other consumers of SCEV. We
// attempt to avoid evaluating SCEVs for sign/zero extend operations until // attempt to avoid evaluating SCEVs for sign/zero extend operations until
// other expressions involving loop IVs have been evaluated. This helps SCEV // other expressions involving loop IVs have been evaluated. This helps SCEV
// propagate no-wrap flags before normalizing sign/zero extension. // set no-wrap flags before normalizing sign/zero extension.
if (DisableIVRewrite) { if (DisableIVRewrite) {
Rewriter.disableCanonicalMode(); Rewriter.disableCanonicalMode();
SimplifyIVUsersNoRewrite(L, Rewriter); SimplifyIVUsersNoRewrite(L, Rewriter);