Don't depend on the C99 copysign function, implement it ourselves.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26566 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index ec77817..1a965a2 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -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 @@
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