copysign: make it friendly to non 64bit capable platforms

diff --git a/Library/libs/copysign.c b/Library/libs/copysign.c
index 28dc172..1b3f892 100644 (file)
--- a/Library/libs/copysign.c
+++ b/Library/libs/copysign.c
@@ -4,11 +4,10 @@
 #include "libm.h"
 
 double copysign(double x, double y) {
-       union dshape ux, uy;
-
-       ux.value = x;
-       uy.value = y;
-       ux.bits &= (uint64_t)-1>>1;
-       ux.bits |= uy.bits & (uint64_t)1<<63;
-       return ux.value;
+       uint32_t hi;
+       uint32_t his;
+       GET_HIGH_WORD(x, hi);
+       GET_HIGH_WORD(y, his);
+       SET_HIGH_WORD(x, (hi & 0x7FFFFFFFUL) | (his & 0x80000000UL));
+       return x;
 }