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| 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/SimplifyCFG.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/SimplifyCFG.cpp')
| -rw-r--r-- | lib/Transforms/Utils/SimplifyCFG.cpp | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/Transforms/Utils/SimplifyCFG.cpp b/lib/Transforms/Utils/SimplifyCFG.cpp index d53a46ee02..66dd2c954e 100644 --- a/lib/Transforms/Utils/SimplifyCFG.cpp +++ b/lib/Transforms/Utils/SimplifyCFG.cpp @@ -2562,7 +2562,7 @@ static bool EliminateDeadSwitchCases(SwitchInst *SI) { Value *Cond = SI->getCondition(); unsigned Bits = cast<IntegerType>(Cond->getType())->getBitWidth(); APInt KnownZero(Bits, 0), KnownOne(Bits, 0); - ComputeMaskedBits(Cond, APInt::getAllOnesValue(Bits), KnownZero, KnownOne); + ComputeMaskedBits(Cond, KnownZero, KnownOne); // Gather dead cases. SmallVector<ConstantInt*, 8> DeadCases; |