diff options
Diffstat (limited to 'toolchain/musl/patches/048-math-fix-pow-signed-shift-ub.patch')
| -rw-r--r-- | toolchain/musl/patches/048-math-fix-pow-signed-shift-ub.patch | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/toolchain/musl/patches/048-math-fix-pow-signed-shift-ub.patch b/toolchain/musl/patches/048-math-fix-pow-signed-shift-ub.patch new file mode 100644 index 0000000000..fde857b213 --- /dev/null +++ b/toolchain/musl/patches/048-math-fix-pow-signed-shift-ub.patch @@ -0,0 +1,38 @@ +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 |