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author | Andrew Trick <atrick@apple.com> | 2013-10-24 00:43:38 +0000 |
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committer | Andrew Trick <atrick@apple.com> | 2013-10-24 00:43:38 +0000 |
commit | ada2356ac95fefeed7b6f932e079e7f7415ebaf7 (patch) | |
tree | d601c99010ee86fb5c6cdd9b5d87af8555e29490 /llvm/lib/Transforms | |
parent | c89fc826b2686f4805f689026ecaec8790e8a12f (diff) | |
download | bcm5719-llvm-ada2356ac95fefeed7b6f932e079e7f7415ebaf7.tar.gz bcm5719-llvm-ada2356ac95fefeed7b6f932e079e7f7415ebaf7.zip |
Clarify comments in genLoopLimit.
llvm-svn: 193292
Diffstat (limited to 'llvm/lib/Transforms')
-rw-r--r-- | llvm/lib/Transforms/Scalar/IndVarSimplify.cpp | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/llvm/lib/Transforms/Scalar/IndVarSimplify.cpp b/llvm/lib/Transforms/Scalar/IndVarSimplify.cpp index 9c092e6077e..7785855d0e1 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. |