Author: dim
Date: Sun Aug 9 10:00:13 2015
New Revision: 286515
URL: https://svnweb.freebsd.org/changeset/base/286515
Log:
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
MFC after: 3 days
Modified:
head/lib/msun/src/s_exp2.c
Modified: head/lib/msun/src/s_exp2.c
==============================================================================
--- head/lib/msun/src/s_exp2.c Sun Aug 9 09:54:29 2015 (r286514)
+++ head/lib/msun/src/s_exp2.c Sun Aug 9 10:00:13 2015 (r286515)
@@ -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);
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