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Repair a regression in Transforms/InstCombine/mul.ll that Reid noticed.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@39896 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-07-16 04:15:34 +00:00
parent e2ece3f479
commit cb7122bb7d
1 changed files with 13 additions and 0 deletions
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13
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -2286,9 +2286,22 @@ static bool isSignBitCheck(ICmpInst::Predicate pred, ConstantInt *RHS,
case ICmpInst::ICMP_SLT: // True if LHS s< 0
TrueIfSigned = true;
return RHS->isZero();
case ICmpInst::ICMP_SLE: // True if LHS s<= RHS and RHS == -1
TrueIfSigned = true;
return RHS->isAllOnesValue();
case ICmpInst::ICMP_SGT: // True if LHS s> -1
TrueIfSigned = false;
return RHS->isAllOnesValue();
case ICmpInst::ICMP_UGT:
// True if LHS u> RHS and RHS == high-bit-mask - 1
TrueIfSigned = true;
return RHS->getValue() ==
APInt::getSignedMaxValue(RHS->getType()->getPrimitiveSizeInBits());
case ICmpInst::ICMP_UGE:
// True if LHS u>= RHS and RHS == high-bit-mask (2^7, 2^15, 2^31, etc)
TrueIfSigned = true;
return RHS->getValue() ==
APInt::getSignBit(RHS->getType()->getPrimitiveSizeInBits());
default:
return false;
}