From: Alan Cox <alan@linux.intel.com>
Date: Mon, 5 Mar 2018 20:26:26 +0000 (+0000)
Subject: copysign: make it friendly to non 64bit capable platforms
X-Git-Url: https://git.ndcode.org/public/gitweb.cgi?a=commitdiff_plain;h=1ca149f22f82ae5eab823d7237cab046a6a6d337;p=FUZIX.git

copysign: make it friendly to non 64bit capable platforms
---

diff --git a/Library/libs/copysign.c b/Library/libs/copysign.c
index 28dc1723..1b3f8922 100644
--- 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;
 }