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@ -1085,7 +1085,7 @@ void IndVarSimplify::SimplifyIVUsersNoRewrite(Loop *L, SCEVExpander &Rewriter) {
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// simplification on the wide IVs.
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// simplification on the wide IVs.
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while (!LoopPhis.empty()) {
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while (!LoopPhis.empty()) {
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// Evaluate as many IV expressions as possible before widening any IVs. This
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// Evaluate as many IV expressions as possible before widening any IVs. This
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// forces SCEV to propagate no-wrap flags before evaluating sign/zero
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// forces SCEV to set no-wrap flags before evaluating sign/zero
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// extension. The first time SCEV attempts to normalize sign/zero extension,
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// extension. The first time SCEV attempts to normalize sign/zero extension,
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// the result becomes final. So for the most predictable results, we delay
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// the result becomes final. So for the most predictable results, we delay
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// evaluation of sign/zero extend evaluation until needed, and avoid running
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// evaluation of sign/zero extend evaluation until needed, and avoid running
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@ -1176,7 +1176,7 @@ bool IndVarSimplify::runOnLoop(Loop *L, LPPassManager &LPM) {
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// Simplification works best when run before other consumers of SCEV. We
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// Simplification works best when run before other consumers of SCEV. We
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// attempt to avoid evaluating SCEVs for sign/zero extend operations until
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// attempt to avoid evaluating SCEVs for sign/zero extend operations until
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// other expressions involving loop IVs have been evaluated. This helps SCEV
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// other expressions involving loop IVs have been evaluated. This helps SCEV
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// propagate no-wrap flags before normalizing sign/zero extension.
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// set no-wrap flags before normalizing sign/zero extension.
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if (DisableIVRewrite) {
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if (DisableIVRewrite) {
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Rewriter.disableCanonicalMode();
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Rewriter.disableCanonicalMode();
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SimplifyIVUsersNoRewrite(L, Rewriter);
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SimplifyIVUsersNoRewrite(L, Rewriter);
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