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Don't (unconditionally) use getSCEVAtScope to simplify the step

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expression in IVUsers, because in the case of a use of a non-linear
addrec outside of a loop, this causes the addrec to be evaluated as
a linear addrec.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73774 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2009-06-19 17:33:15 +00:00
parent ae60c0f78e
commit 958e292c7a
2 changed files with 18 additions and 1 deletions
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lib/Analysis/IVUsers.cpp
-1
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@@ -112,7 +112,6 @@ static bool getSCEVStartAndStride(const SCEVHandle &SH, Loop *L, Loop *UseLoop,
SCEVHandle AddRecStart = AddRec->getStart();
AddRecStart = SE->getSCEVAtScope(AddRecStart, UseLoop);
SCEVHandle AddRecStride = AddRec->getStepRecurrence(*SE);
AddRecStride = SE->getSCEVAtScope(AddRecStride, UseLoop);
// FIXME: If Start contains an SCEVAddRecExpr from a different loop, other
// than an outer loop of the current loop, reject it. LSR has no concept of