X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=src%2Fmath%2Futil.c;h=f02f5a033a207075ad666885d5ac142ad75b051b;hb=c58b8e7cb29f954791ffd5bc2d97ddb4d4202d0c;hp=1b2ff78fe3f68f33c22afc8a845054c93aeb59a9;hpb=ae0f0fe09b7fc9d44d072c3fd08372991d852b1d;p=libc-test

diff --git a/src/math/util.c b/src/math/util.c
index 1b2ff78..f02f5a0 100644
--- a/src/math/util.c
+++ b/src/math/util.c
@@ -43,8 +43,11 @@ float ulperrf(float got, float want, float dwant)
 {
 	if (isnan(got) && isnan(want))
 		return 0;
-	if (got == want && signbit(got) == signbit(want))
-		return dwant;
+	if (got == want) {
+		if (signbit(got) == signbit(want))
+			return dwant;
+		return inf;
+	}
 	if (isinf(got)) {
 		got = copysignf(0x1p127, got);
 		want *= 0.5;
@@ -56,8 +59,11 @@ float ulperr(double got, double want, float dwant)
 {
 	if (isnan(got) && isnan(want))
 		return 0;
-	if (got == want && signbit(got) == signbit(want))
-		return dwant;
+	if (got == want) {
+		if (signbit(got) == signbit(want))
+			return dwant;
+		return inf; // treat 0 sign errors badly
+	}
 	if (isinf(got)) {
 		got = copysign(0x1p1023, got);
 		want *= 0.5;
@@ -72,8 +78,11 @@ float ulperrl(long double got, long double want, float dwant)
 #elif LDBL_MANT_DIG == 64
 	if (isnan(got) && isnan(want))
 		return 0;
-	if (got == want && signbit(got) == signbit(want))
-		return dwant;
+	if (got == want) {
+		if (signbit(got) == signbit(want))
+			return dwant;
+		return inf;
+	}
 	if (isinf(got)) {
 		got = copysignl(0x1p16383L, got);
 		want *= 0.5;