diff options
| author | Dan Gohman <gohman@apple.com> | 2009-04-21 20:18:36 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2009-04-21 20:18:36 +0000 |
| commit | 578ccf81e5b94965e3ce8b4eadb6834e39f5f41d (patch) | |
| tree | a7eb49d0dc6de05f54e2a0c9f0b7ada436ce6b5e /lib/Analysis/ScalarEvolution.cpp | |
| parent | 4558f481b83a3c14ad5f1077b053a748a3203059 (diff) | |
When turning (ashr(shl(x, n), n)) into sext(trunc(x)), the width of the
type to truncate to should be the number of bits of the value that are
preserved, not the number that are clobbered with sign-extension.
This fixes regressions in ldecod.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69704 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Analysis/ScalarEvolution.cpp')
| -rw-r--r-- | lib/Analysis/ScalarEvolution.cpp | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/Analysis/ScalarEvolution.cpp b/lib/Analysis/ScalarEvolution.cpp index ace063a399..0aa673f355 100644 --- a/lib/Analysis/ScalarEvolution.cpp +++ b/lib/Analysis/ScalarEvolution.cpp @@ -2015,7 +2015,7 @@ SCEVHandle ScalarEvolutionsImpl::createSCEV(Value *V) { if (Instruction *L = dyn_cast<Instruction>(U->getOperand(0))) if (L->getOpcode() == Instruction::Shl && L->getOperand(1) == U->getOperand(1)) { - uint64_t Amt = CI->getZExtValue(); + uint64_t Amt = getTypeSizeInBits(U->getType()) - CI->getZExtValue(); return SE.getSignExtendExpr(SE.getTruncateExpr(getSCEV(L->getOperand(0)), IntegerType::get(Amt)), |