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Guard further against APInt operations with operands of unequal bit width.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34897 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer 2007-03-04 01:25:35 +00:00
parent 9caed5440d
commit 0797605204
1 changed files with 11 additions and 4 deletions
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15
lib/Analysis/ScalarEvolution.cpp
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@ -1354,16 +1354,22 @@ static APInt GetConstantFactor(SCEVHandle S) {
// The result is the min of all operands.
APInt Res = GetConstantFactor(A->getOperand(0));
for (unsigned i = 1, e = A->getNumOperands();
i != e && Res.ugt(APInt(Res.getBitWidth(),1)); ++i)
Res = APIntOps::umin(Res, GetConstantFactor(A->getOperand(i)));
i != e && Res.ugt(APInt(Res.getBitWidth(),1)); ++i) {
APInt Tmp(GetConstantFactor(A->getOperand(i)));
Tmp.zextOrTrunc(Res.getBitWidth());
Res = APIntOps::umin(Res, Tmp);
}
return Res;
}
if (SCEVMulExpr *M = dyn_cast<SCEVMulExpr>(S)) {
// The result is the product of all the operands.
APInt Res = GetConstantFactor(M->getOperand(0));
for (unsigned i = 1, e = M->getNumOperands(); i != e; ++i)
Res *= GetConstantFactor(M->getOperand(i));
for (unsigned i = 1, e = M->getNumOperands(); i != e; ++i) {
APInt Tmp(GetConstantFactor(M->getOperand(i)));
Tmp.zextOrTrunc(Res.getBitWidth());
Res *= Tmp;
}
return Res;
}
@ -1375,6 +1381,7 @@ static APInt GetConstantFactor(SCEVHandle S) {
if (Start == 1)
return APInt(A->getBitWidth(),1);
APInt Stride = GetConstantFactor(A->getOperand(1));
Start.zextOrTrunc(Stride.getBitWidth());
return APIntOps::GreatestCommonDivisor(Start, Stride);
}
}