From be81f51030d90de8d5eb0b65dbdab3032d5cae23 Mon Sep 17 00:00:00 2001
From: Szabolcs Nagy <nsz@port70.net>
Date: Mon, 12 Nov 2012 23:58:18 +0100
Subject: math: raise invalid flag in ilogb*.c on +-0, +-inf and nan

---
 src/math/ilogbl.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

(limited to 'src/math/ilogbl.c')

diff --git a/src/math/ilogbl.c b/src/math/ilogbl.c
index ed9ddcbc..1512934f 100644
--- a/src/math/ilogbl.c
+++ b/src/math/ilogbl.c
@@ -14,15 +14,19 @@ int ilogbl(long double x)
 	int e = u.bits.exp;
 
 	if (!e) {
-		if (m == 0)
+		if (m == 0) {
+			FORCE_EVAL(0/0.0f);
 			return FP_ILOGB0;
+		}
 		/* subnormal x */
 		for (e = -0x3fff+1; m < (uint64_t)1<<63; e--, m<<=1);
 		return e;
 	}
-	if (e == 0x7fff)
+	if (e == 0x7fff) {
+		FORCE_EVAL(0/0.0f);
 		/* in ld80 msb is set in inf */
 		return m & (uint64_t)-1>>1 ? FP_ILOGBNAN : INT_MAX;
+	}
 	return e - 0x3fff;
 }
 #endif
-- 
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