diff options
| author | Rafael Espindola <rafael.espindola@gmail.com> | 2012-04-04 12:51:34 +0000 |
|---|---|---|
| committer | Rafael Espindola <rafael.espindola@gmail.com> | 2012-04-04 12:51:34 +0000 |
| commit | 26c8dcc692fb2addd475446cfff24d6a4e958bca (patch) | |
| tree | b71cb0d781e2735397c728f276f14ea63780d04c /lib/Transforms/Utils/Local.cpp | |
| parent | 00b73a5e443d49d68f59a5fb517e940842423ae6 (diff) | |
Always compute all the bits in ComputeMaskedBits.
This allows us to keep passing reduced masks to SimplifyDemandedBits, but
know about all the bits if SimplifyDemandedBits fails. This allows instcombine
to simplify cases like the one in the included testcase.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154011 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/Utils/Local.cpp')
| -rw-r--r-- | lib/Transforms/Utils/Local.cpp | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/lib/Transforms/Utils/Local.cpp b/lib/Transforms/Utils/Local.cpp index b51dd29b57..d1c4d59682 100644 --- a/lib/Transforms/Utils/Local.cpp +++ b/lib/Transforms/Utils/Local.cpp @@ -762,9 +762,8 @@ unsigned llvm::getOrEnforceKnownAlignment(Value *V, unsigned PrefAlign, assert(V->getType()->isPointerTy() && "getOrEnforceKnownAlignment expects a pointer!"); unsigned BitWidth = TD ? TD->getPointerSizeInBits() : 64; - APInt Mask = APInt::getAllOnesValue(BitWidth); APInt KnownZero(BitWidth, 0), KnownOne(BitWidth, 0); - ComputeMaskedBits(V, Mask, KnownZero, KnownOne, TD); + ComputeMaskedBits(V, KnownZero, KnownOne, TD); unsigned TrailZ = KnownZero.countTrailingOnes(); // Avoid trouble with rediculously large TrailZ values, such as |