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The first half of a fix for PR218 & test/Regression/Assembler/2004-02-01-NegativeZero.llx

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11063 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-02-01 22:48:09 +00:00
parent 18b34e8b1b
commit cf2c4f8ae5
1 changed files with 12 additions and 3 deletions

15
include/llvm/Constants.h

@ -258,7 +258,8 @@ public:
///
class ConstantFP : public Constant {
double Val;
friend struct ConstantCreator<ConstantFP, Type, double>;
friend struct ConstantCreator<ConstantFP, Type, uint64_t>;
friend struct ConstantCreator<ConstantFP, Type, uint32_t>;
ConstantFP(const ConstantFP &); // DO NOT IMPLEMENT
protected:
ConstantFP(const Type *Ty, double V);
@ -271,8 +272,16 @@ public:
inline double getValue() const { return Val; }
/// isNullValue - Return true if this is the value that would be returned by
/// getNullValue.
virtual bool isNullValue() const { return Val == 0; }
/// getNullValue. Don't depend on == for doubles to tell us it's zero, it
/// considers -0.0 to be null as well as 0.0. :(
virtual bool isNullValue() const {
union {
double V;
uint64_t I;
} T;
T.V = Val;
return T.I == 0;
}
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const ConstantFP *) { return true; }