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

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

diff --git a/src/math/ilogbf.c b/src/math/ilogbf.c
index 272cbdac..42cd62e2 100644
--- a/src/math/ilogbf.c
+++ b/src/math/ilogbf.c
@@ -8,13 +8,17 @@ int ilogbf(float x)
 
 	if (!e) {
 		u.bits <<= 9;
-		if (u.bits == 0)
+		if (u.bits == 0) {
+			FORCE_EVAL(0/0.0f);
 			return FP_ILOGB0;
+		}
 		/* subnormal x */
 		for (e = -0x7f; u.bits < (uint32_t)1<<31; e--, u.bits<<=1);
 		return e;
 	}
-	if (e == 0xff)
+	if (e == 0xff) {
+		FORCE_EVAL(0/0.0f);
 		return u.bits<<9 ? FP_ILOGBNAN : INT_MAX;
+	}
 	return e - 0x7f;
 }
-- 
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