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fold fp div by 0 to inf, the way gcc does. This is legal according to the FP spec

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21655 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Lenharth 2005-05-02 21:25:47 +00:00
parent abc73b3e5d
commit 8b9e3e6511
1 changed files with 7 additions and 0 deletions
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7
lib/VMCore/ConstantFold.cpp
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@ -470,6 +470,13 @@ struct DirectFPRules
(BuiltinType)V2->getValue());
return ConstantClass::get(*Ty, Result);
}
static Constant *Div(const ConstantClass *V1, const ConstantClass *V2) {
if (V2->isExactlyValue(0.0)) return ConstantClass::get(*Ty, INFINITY);
if (V2->isExactlyValue(-0.0)) return ConstantClass::get(*Ty, -INFINITY);
if (V2->isNullValue()) return 0;
BuiltinType R = (BuiltinType)V1->getValue() / (BuiltinType)V2->getValue();
return ConstantClass::get(*Ty, R);
}
};