Author: dim
Date: Wed Aug 12 19:06:35 2015
New Revision: 286688
URL: https://svnweb.freebsd.org/changeset/base/286688
Log:
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
Modified:
stable/10/lib/msun/src/s_exp2.c
Directory Properties:
stable/10/ (props changed)
Changes in other areas also in this revision:
Modified:
stable/8/lib/msun/src/s_exp2.c
stable/9/lib/msun/src/s_exp2.c
Directory Properties:
stable/8/ (props changed)
stable/8/lib/ (props changed)
stable/8/lib/msun/ (props changed)
stable/9/ (props changed)
stable/9/lib/ (props changed)
stable/9/lib/msun/ (props changed)
Modified: stable/10/lib/msun/src/s_exp2.c
==============================================================================
--- stable/10/lib/msun/src/s_exp2.c Wed Aug 12 19:00:47 2015
(r286687)
+++ stable/10/lib/msun/src/s_exp2.c Wed Aug 12 19:06:35 2015
(r286688)
@@ -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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