From 28229b8a83d2ab03206ccdcabf6431c8f5e02270 Mon Sep 17 00:00:00 2001 From: dim Date: Wed, 12 Aug 2015 19:06:35 +0000 Subject: MFC r286515: In libm's exp2(3), avoid left-shifting a negative integer, which is undefined. Replace it with the intended value, in a defined way. Reviewed by: bde --- lib/msun/src/s_exp2.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/lib/msun/src/s_exp2.c b/lib/msun/src/s_exp2.c index fde11c2..5cf2e15 100644 --- a/lib/msun/src/s_exp2.c +++ b/lib/msun/src/s_exp2.c @@ -376,14 +376,14 @@ exp2(double x) /* Compute r = exp2(y) = exp2t[i0] * p(z - eps[i]). */ t = tbl[i0]; /* exp2t[i0] */ z -= tbl[i0 + 1]; /* eps[i0] */ - if (k >= -1021 << 20) + if (k >= -(1021 << 20)) INSERT_WORDS(twopk, 0x3ff00000 + k, 0); else INSERT_WORDS(twopkp1000, 0x3ff00000 + k + (1000 << 20), 0); r = t + t * z * (P1 + z * (P2 + z * (P3 + z * (P4 + z * P5)))); /* Scale by 2**(k>>20). */ - if(k >= -1021 << 20) { + if(k >= -(1021 << 20)) { if (k == 1024 << 20) return (r * 2.0 * 0x1p1023); return (r * twopk); -- cgit v1.1