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Fix ICmpInst::makeConstantRange to use ConstantRange's API properly

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in the case of empty and full ranges.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94548 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2010-01-26 16:04:20 +00:00
parent 8dcc58e6b4
commit f21107c07a
1 changed files with 30 additions and 2 deletions
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32
lib/VMCore/Instructions.cpp
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@ -2865,25 +2865,53 @@ ICmpInst::makeConstantRange(Predicate pred, const APInt &C) {
default: llvm_unreachable("Invalid ICmp opcode to ConstantRange ctor!");
case ICmpInst::ICMP_EQ: Upper++; break;
case ICmpInst::ICMP_NE: Lower++; break;
case ICmpInst::ICMP_ULT: Lower = APInt::getMinValue(BitWidth); break;
case ICmpInst::ICMP_SLT: Lower = APInt::getSignedMinValue(BitWidth); break;
case ICmpInst::ICMP_ULT:
Lower = APInt::getMinValue(BitWidth);
// Check for an empty-set condition.
if (Lower == Upper)
return ConstantRange(BitWidth, /*isFullSet=*/false);
break;
case ICmpInst::ICMP_SLT:
Lower = APInt::getSignedMinValue(BitWidth);
// Check for an empty-set condition.
if (Lower == Upper)
return ConstantRange(BitWidth, /*isFullSet=*/false);
break;
case ICmpInst::ICMP_UGT:
Lower++; Upper = APInt::getMinValue(BitWidth); // Min = Next(Max)
// Check for an empty-set condition.
if (Lower == Upper)
return ConstantRange(BitWidth, /*isFullSet=*/false);
break;
case ICmpInst::ICMP_SGT:
Lower++; Upper = APInt::getSignedMinValue(BitWidth); // Min = Next(Max)
// Check for an empty-set condition.
if (Lower == Upper)
return ConstantRange(BitWidth, /*isFullSet=*/false);
break;
case ICmpInst::ICMP_ULE:
Lower = APInt::getMinValue(BitWidth); Upper++;
// Check for a full-set condition.
if (Lower == Upper)
return ConstantRange(BitWidth, /*isFullSet=*/true);
break;
case ICmpInst::ICMP_SLE:
Lower = APInt::getSignedMinValue(BitWidth); Upper++;
// Check for a full-set condition.
if (Lower == Upper)
return ConstantRange(BitWidth, /*isFullSet=*/true);
break;
case ICmpInst::ICMP_UGE:
Upper = APInt::getMinValue(BitWidth); // Min = Next(Max)
// Check for a full-set condition.
if (Lower == Upper)
return ConstantRange(BitWidth, /*isFullSet=*/true);
break;
case ICmpInst::ICMP_SGE:
Upper = APInt::getSignedMinValue(BitWidth); // Min = Next(Max)
// Check for a full-set condition.
if (Lower == Upper)
return ConstantRange(BitWidth, /*isFullSet=*/true);
break;
}
return ConstantRange(Lower, Upper);