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Fix a bogus srem rule - a negative value srem'd by a power-of-2

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can have a non-negative result; for example, -16%16 is 0. Also,
clarify the related comments. This fixes PR2670.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54767 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2008-08-13 23:12:35 +00:00
parent 289983123b
commit a60832b018
4 changed files with 24 additions and 13 deletions
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3
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -1266,11 +1266,8 @@ bool InstCombiner::SimplifyDemandedBits(Value *V, APInt DemandedMask,
if (LHSKnownZero[BitWidth-1] || ((LHSKnownZero & LowBits) == LowBits))
LHSKnownZero |= ~LowBits;
else if (LHSKnownOne[BitWidth-1])
LHSKnownOne |= ~LowBits;
KnownZero |= LHSKnownZero & DemandedMask;
KnownOne |= LHSKnownOne & DemandedMask;
assert((KnownZero & KnownOne) == 0&&"Bits known to be one AND zero?");
}