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Set isSigned to true when creating an all-ones integer constant, even 

for unsigned purposes, so >64-bit integer values get a full all-ones
value.

llvm-svn: 102739
This commit is contained in:
Dan Gohman 2010-04-30 19:22:39 +00:00
parent 1c07852e17
commit a0a8a7fe40
1 changed files with 4 additions and 4 deletions
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8
llvm/lib/Analysis/ScalarEvolution.cpp
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@ -3948,22 +3948,22 @@ ScalarEvolution::ComputeBackedgeTakenCountFromExitCondICmp(const Loop *L,
break;
case ICmpInst::ICMP_ULE:
if (!getUnsignedRange(RHS).getUnsignedMax().isMaxValue()) {
RHS = getAddExpr(getConstant(RHS->getType(), 1, false), RHS,
RHS = getAddExpr(getConstant(RHS->getType(), 1, true), RHS,
/*HasNUW=*/true, /*HasNSW=*/false);
Cond = ICmpInst::ICMP_ULT;
} else if (!getUnsignedRange(LHS).getUnsignedMin().isMinValue()) {
LHS = getAddExpr(getConstant(RHS->getType(), (uint64_t)-1, false), LHS,
LHS = getAddExpr(getConstant(RHS->getType(), (uint64_t)-1, true), LHS,
/*HasNUW=*/true, /*HasNSW=*/false);
Cond = ICmpInst::ICMP_ULT;
}
break;
case ICmpInst::ICMP_UGE:
if (!getUnsignedRange(RHS).getUnsignedMin().isMinValue()) {
RHS = getAddExpr(getConstant(RHS->getType(), (uint64_t)-1, false), RHS,
RHS = getAddExpr(getConstant(RHS->getType(), (uint64_t)-1, true), RHS,
/*HasNUW=*/true, /*HasNSW=*/false);
Cond = ICmpInst::ICMP_UGT;
} else if (!getUnsignedRange(LHS).getUnsignedMax().isMaxValue()) {
LHS = getAddExpr(getConstant(RHS->getType(), 1, false), LHS,
LHS = getAddExpr(getConstant(RHS->getType(), 1, true), LHS,
/*HasNUW=*/true, /*HasNSW=*/false);
Cond = ICmpInst::ICMP_UGT;
}