From: Szabolcs Nagy <nsz@port70.net>
To: musl@lists.openwall.com
Cc: Petr Hosek <phosek@chromium.org>
Subject: [PATCH] math: fix expf(-NAN) to return -NAN instead of 0
Date: Fri, 4 Mar 2016 22:37:53 +0100 [thread overview]
Message-ID: <20160304213753.GM29662@port70.net> (raw)
expf(-NAN) was treated as expf(-large) which unconditionally
returns +0, so special case +-NAN.
reported by Petr Hosek.
---
src/math/expf.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/src/math/expf.c b/src/math/expf.c
index 16e9afe..4a742e4 100644
--- a/src/math/expf.c
+++ b/src/math/expf.c
@@ -39,6 +39,8 @@ float expf(float x)
/* special cases */
if (hx >= 0x42aeac50) { /* if |x| >= -87.33655f or NaN */
+ if (hx > 0x7f800000) /* +-NaN */
+ return x;
if (hx >= 0x42b17218 && !sign) { /* x >= 88.722839f */
/* overflow */
x *= 0x1p127f;
--
2.7.0
next reply other threads:[~2016-03-04 21:37 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-04 21:37 Szabolcs Nagy [this message]
2016-03-04 21:40 ` Szabolcs Nagy
2016-03-04 22:06 ` Szabolcs Nagy
2016-03-06 0:59 ` Rich Felker
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