Revert "libm: fma: correct zero sign with small inputs"

This change introduced a test failure, so revert until that can be addressed. This reverts commit 888796a. PR: 277783 Reported by: rlibby Sponsored by: The FreeBSD Foundation
HardenedBSD · Jun 12, 2024 · e77ad95 · e77ad95
1 parent 92927b8
commit e77ad95
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Showing 2 changed files with 2 additions and 6 deletions.
diff --git a/lib/msun/src/s_fma.c b/lib/msun/src/s_fma.c
@@ -267,9 +267,7 @@ fma(double x, double y, double z)
 		 */
 		fesetround(oround);
 		volatile double vzs = zs; /* XXX gcc CSE bug workaround */
-		xs = ldexp(xy.lo, spread);
-		xy.hi += vzs;
-		return (xy.hi == 0 ? xs : xy.hi + xs);
+		return (xy.hi + vzs + ldexp(xy.lo, spread));
 	}
 
 	if (oround != FE_TONEAREST) {

diff --git a/lib/msun/src/s_fmal.c b/lib/msun/src/s_fmal.c
@@ -248,9 +248,7 @@ fmal(long double x, long double y, long double z)
 		 */
 		fesetround(oround);
 		volatile long double vzs = zs; /* XXX gcc CSE bug workaround */
-		xs = ldexpl(xy.lo, spread);
-		xy.hi += vzs;
-		return (xy.hi == 0 ? xs : xy.hi + xs);
+		return (xy.hi + vzs + ldexpl(xy.lo, spread));
 	}
 
 	if (oround != FE_TONEAREST) {