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Rework the SelectionDAG-based implementations of SimplifyDemandedBits

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and ComputeMaskedBits to match the new improved versions in instcombine.
Tested against all of multisource/benchmarks on ppc.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26238 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nate Begeman
2006-02-16 21:11:51 +00:00
parent a6bbfe8448
commit 368e18d56a
7 changed files with 639 additions and 215 deletions
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6
lib/Transforms/Scalar/InstructionCombining.cpp
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@@ -767,9 +767,9 @@ bool InstCombiner::SimplifyDemandedBits(Value *V, uint64_t DemandedMask,
if ((DemandedMask & (~KnownZero) & KnownOne2) ==
(DemandedMask & (~KnownZero)))
return UpdateValueUsesWith(I, I->getOperand(0));
if ((DemandedMask & (~KnownZero2) & KnownOne) ==
(DemandedMask & (~KnownZero2)))
return UpdateValueUsesWith(I, I->getOperand(1));
if ((DemandedMask & (~KnownZero2) & KnownOne) ==
(DemandedMask & (~KnownZero2)))
return UpdateValueUsesWith(I, I->getOperand(1));
// If the RHS is a constant, see if we can simplify it.
if (ShrinkDemandedConstant(I, 1, DemandedMask))