mirror of https://github.com/hak5/openwrt-owl.git
39 lines
1.1 KiB
Diff
39 lines
1.1 KiB
Diff
From 688d3da0f1730daddbc954bbc2d27cc96ceee04c Mon Sep 17 00:00:00 2001
|
|
From: Szabolcs Nagy <nsz@port70.net>
|
|
Date: Tue, 4 Oct 2016 03:58:56 +0200
|
|
Subject: math: fix pow signed shift ub
|
|
|
|
j is int32_t and thus j<<31 is undefined if j==1, so j is changed to
|
|
uint32_t locally as a quick fix, the generated code is not affected.
|
|
|
|
(this is a strict conformance fix, future c standard may allow 1<<31,
|
|
see DR 463. the bug was inherited from freebsd fdlibm, the proper fix
|
|
is to use uint32_t for all bit hacks, but that requires more intrusive
|
|
changes.)
|
|
|
|
reported by Daniel Sabogal
|
|
---
|
|
src/math/pow.c | 4 ++--
|
|
1 file changed, 2 insertions(+), 2 deletions(-)
|
|
|
|
diff --git a/src/math/pow.c b/src/math/pow.c
|
|
index b66f632..3ddc1b6 100644
|
|
--- a/src/math/pow.c
|
|
+++ b/src/math/pow.c
|
|
@@ -125,11 +125,11 @@ double pow(double x, double y)
|
|
else if (iy >= 0x3ff00000) {
|
|
k = (iy>>20) - 0x3ff; /* exponent */
|
|
if (k > 20) {
|
|
- j = ly>>(52-k);
|
|
+ uint32_t j = ly>>(52-k);
|
|
if ((j<<(52-k)) == ly)
|
|
yisint = 2 - (j&1);
|
|
} else if (ly == 0) {
|
|
- j = iy>>(20-k);
|
|
+ uint32_t j = iy>>(20-k);
|
|
if ((j<<(20-k)) == iy)
|
|
yisint = 2 - (j&1);
|
|
}
|
|
--
|
|
cgit v0.11.2
|