From 9f58d06007818c43b9504e959ef81ab5f113b374 Mon Sep 17 00:00:00 2001
From: nsz <nsz@port70.net>
Date: Wed, 28 Mar 2012 23:51:09 +0200
Subject: [PATCH] math: fix modfl.c bug modfl(+-inf) was wrong on ld80 because
 the explicit msb was not taken into account during inf vs nan check

---
 src/math/modfl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/math/modfl.c b/src/math/modfl.c
index 6520a1c2..f6d62444 100644
--- a/src/math/modfl.c
+++ b/src/math/modfl.c
@@ -81,7 +81,7 @@ long double modfl(long double x, long double *iptr)
 		return x - ux.e;
 	} else if (e >= LDBL_MANT_DIG - 1) {    /* x has no fraction part. */
 		*iptr = x;
-		if (e == LDBL_MAX_EXP && (ux.bits.manh|ux.bits.manl)) /* nan */
+		if (e == LDBL_MAX_EXP && ((ux.bits.manh&~LDBL_NBIT)|ux.bits.manl)) /* nan */
 			return x;
 		return zero[ux.bits.sign];
 	} else {                                /* Fraction part is in manl. */