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| author | Andrew Trick <atrick@apple.com> | 2013-10-24 00:43:38 +0000 |
|---|---|---|
| committer | Andrew Trick <atrick@apple.com> | 2013-10-24 00:43:38 +0000 |
| commit | 577ac566c45670cd8ef03e202cb92258c643574d (patch) | |
| tree | 0caba1482ae0c84a38ed5ab16d82ed8334a7aacb /lib/Transforms/Scalar/IndVarSimplify.cpp | |
| parent | 2ad18efdc73bc2356aa7fbf811d5ecbbaac0f2c9 (diff) | |
| download | llvm-577ac566c45670cd8ef03e202cb92258c643574d.tar.gz llvm-577ac566c45670cd8ef03e202cb92258c643574d.tar.bz2 llvm-577ac566c45670cd8ef03e202cb92258c643574d.tar.xz | |
Clarify comments in genLoopLimit.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193292 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/Scalar/IndVarSimplify.cpp')
| -rw-r--r-- | lib/Transforms/Scalar/IndVarSimplify.cpp | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/lib/Transforms/Scalar/IndVarSimplify.cpp b/lib/Transforms/Scalar/IndVarSimplify.cpp index 9c092e6077..7785855d0e 100644 --- a/lib/Transforms/Scalar/IndVarSimplify.cpp +++ b/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. |