From ada2356ac95fefeed7b6f932e079e7f7415ebaf7 Mon Sep 17 00:00:00 2001 From: Andrew Trick Date: Thu, 24 Oct 2013 00:43:38 +0000 Subject: [PATCH] Clarify comments in genLoopLimit. llvm-svn: 193292 --- llvm/lib/Transforms/Scalar/IndVarSimplify.cpp | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/llvm/lib/Transforms/Scalar/IndVarSimplify.cpp b/llvm/lib/Transforms/Scalar/IndVarSimplify.cpp index 9c092e6077e4..7785855d0e13 100644 --- a/llvm/lib/Transforms/Scalar/IndVarSimplify.cpp +++ b/llvm/lib/Transforms/Scalar/IndVarSimplify.cpp @@ -1506,9 +1506,10 @@ static Value *genLoopLimit(PHINode *IndVar, const SCEV *IVCount, Loop *L, // BECount = (IVEnd - IVInit - 1) => IVLimit = IVInit (postinc). // // Valid Cases: (1) both integers is most common; (2) both may be pointers - // for simple memset-style loops; (3) IVInit is an integer and IVCount is a - // pointer may occur when enable-iv-rewrite generates a canonical IV on top - // of case #2. + // for simple memset-style loops. + // + // IVInit integer and IVCount pointer would only occur if a canonical IV + // were generated on top of case #2, which is not expected. const SCEV *IVLimit = 0; // For unit stride, IVCount = Start + BECount with 2's complement overflow.