From 688d3da0f1730daddbc954bbc2d27cc96ceee04c Mon Sep 17 00:00:00 2001 From: Szabolcs Nagy 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(-) (limited to 'src/math') diff --git a/src/math/pow.c b/src/math/pow.c index b66f632d..3ddc1b6f 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 v1.2.1