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Don't depend on the C99 copysign function, implement it ourselves.

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llvm-svn: 26566
This commit is contained in:
Chris Lattner 2006-03-05 23:57:58 +00:00
parent 99767c08ca
commit 101ce8f304
1 changed files with 17 additions and 7 deletions
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24
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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@ -29,11 +29,6 @@
#include <algorithm>
using namespace llvm;
#ifdef _MSC_VER
#include <float.h>
#define copysign _copysign
#endif
static bool isCommutativeBinOp(unsigned Opcode) {
switch (Opcode) {
case ISD::ADD:
@ -1255,8 +1250,23 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,
case ISD::FREM :
if (C2) return getConstantFP(fmod(C1, C2), VT);
break;
case ISD::FCOPYSIGN:
return getConstantFP(copysign(C1, C2), VT);
case ISD::FCOPYSIGN: {
union {
double F;
uint64_t I;
} u1;
union {
double F;
int64_t I;
} u2;
u1.F = C1;
u2.F = C2;
if (u2.I < 0) // Sign bit of RHS set?
u1.I |= 1ULL << 63; // Set the sign bit of the LHS.
else
u1.I &= (1ULL << 63)-1; // Clear the sign bit of the LHS.
return getConstantFP(u1.F, VT);
}
default: break;
}
} else { // Cannonicalize constant to RHS if commutative