From f0aa4850ceb61695500437c26e609c4ec394157a Mon Sep 17 00:00:00 2001 From: Dan Gohman Date: Wed, 29 Apr 2009 01:54:20 +0000 Subject: [PATCH] Update comments to reflect the current code. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70357 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Analysis/ScalarEvolution.cpp | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/lib/Analysis/ScalarEvolution.cpp b/lib/Analysis/ScalarEvolution.cpp index 63ad2970f48..7f632179257 100644 --- a/lib/Analysis/ScalarEvolution.cpp +++ b/lib/Analysis/ScalarEvolution.cpp @@ -717,8 +717,8 @@ SCEVHandle ScalarEvolution::getZeroExtendExpr(const SCEVHandle &Op, // that value once it has finished. SCEVHandle BECount = getBackedgeTakenCount(AR->getLoop()); if (!isa(BECount)) { - // Compute the extent of AR and divide it by the step value. This is - // used to determine if it's safe to extend the stride value. + // Manually compute the final value for AR, checking for + // overflow at each step. SCEVHandle Start = AR->getStart(); SCEVHandle Step = AR->getStepRecurrence(*this); @@ -806,8 +806,8 @@ SCEVHandle ScalarEvolution::getSignExtendExpr(const SCEVHandle &Op, // that value once it has finished. SCEVHandle BECount = getBackedgeTakenCount(AR->getLoop()); if (!isa(BECount)) { - // Compute the extent of AR and divide it by the step value. This is - // used to determine if it's safe to extend the stride value. + // Manually compute the final value for AR, checking for + // overflow at each step. SCEVHandle Start = AR->getStart(); SCEVHandle Step = AR->getStepRecurrence(*this);