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author | Dan Gohman <gohman@apple.com> | 2009-06-17 01:22:39 +0000 |
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committer | Dan Gohman <gohman@apple.com> | 2009-06-17 01:22:39 +0000 |
commit | e49ae43f045ef3be584a5d1440379563b6f07ff1 (patch) | |
tree | 4e1805da4c29f4aa2e122d8da92dbe272d2bdad9 /lib/Analysis | |
parent | 6d1a7bc8baabd7752a219128a7dd88004d4dc010 (diff) | |
download | external_llvm-e49ae43f045ef3be584a5d1440379563b6f07ff1.zip external_llvm-e49ae43f045ef3be584a5d1440379563b6f07ff1.tar.gz external_llvm-e49ae43f045ef3be584a5d1440379563b6f07ff1.tar.bz2 |
Fix ScalarEvolution's Xor handling to not assume that an And
that gets recognized with a SCEVZeroExtendExpr must be an And
with a low-bits mask. With r73540, this is no longer the case.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73594 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Analysis')
-rw-r--r-- | lib/Analysis/ScalarEvolution.cpp | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/lib/Analysis/ScalarEvolution.cpp b/lib/Analysis/ScalarEvolution.cpp index 3731fdf..2546e81 100644 --- a/lib/Analysis/ScalarEvolution.cpp +++ b/lib/Analysis/ScalarEvolution.cpp @@ -2453,9 +2453,12 @@ SCEVHandle ScalarEvolution::createSCEV(Value *V) { if (BO->getOpcode() == Instruction::And && LCI->getValue() == CI->getValue()) if (const SCEVZeroExtendExpr *Z = - dyn_cast<SCEVZeroExtendExpr>(getSCEV(U->getOperand(0)))) - return getZeroExtendExpr(getNotSCEV(Z->getOperand()), - U->getType()); + dyn_cast<SCEVZeroExtendExpr>(getSCEV(U->getOperand(0)))) { + SCEVHandle ZO = Z->getOperand(); + if (APIntOps::isMask(getTypeSizeInBits(ZO->getType()), + CI->getValue())) + return getZeroExtendExpr(getNotSCEV(ZO), U->getType()); + } } break; |