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Revert r237539: "Reapply r237520 with another fix for infinite looping"

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This caused PR23583.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237739 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hans Wennborg
2015-05-19 23:06:30 +00:00
parent 486f97bf19
commit c0f6113287
6 changed files with 7 additions and 162 deletions
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7
lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
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@@ -13,7 +13,6 @@
//===----------------------------------------------------------------------===//
#include "InstCombineInternal.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/PatternMatch.h"
@@ -407,12 +406,6 @@ Value *InstCombiner::SimplifyDemandedUseBits(Value *V, APInt DemandedMask,
break;
}
case Instruction::Select:
// If this is a select as part of a min/max pattern, don't simplify any
// further in case we break the structure.
Value *LHS, *RHS;
if (matchSelectPattern(I, LHS, RHS) != SPF_UNKNOWN)
return nullptr;
if (SimplifyDemandedBits(I->getOperandUse(2), DemandedMask, RHSKnownZero,
RHSKnownOne, Depth + 1) ||
SimplifyDemandedBits(I->getOperandUse(1), DemandedMask, LHSKnownZero,