Author: kargl
Date: Sun Jun 19 17:07:58 2011
New Revision: 223302
URL: http://svn.freebsd.org/changeset/base/223302
Log:
In the libm access macros for the double type, z can sometimes
be used uninitialized. This can lead to spurious exceptions
and bit clobbering.
Submitted by: bde
Approved by: das (mentor)
Modified:
head/lib/msun/src/e_rem_pio2.c
Modified: head/lib/msun/src/e_rem_pio2.c
==============================================================================
--- head/lib/msun/src/e_rem_pio2.c Sun Jun 19 17:02:42 2011
(r223301)
+++ head/lib/msun/src/e_rem_pio2.c Sun Jun 19 17:07:58 2011
(r223302)
@@ -171,9 +171,8 @@ medium:
}
/* set z = scalbn(|x|,ilogb(x)-23) */
GET_LOW_WORD(low,x);
- SET_LOW_WORD(z,low);
e0 = (ix>>20)-1046; /* e0 = ilogb(z)-23; */
- SET_HIGH_WORD(z, ix - ((int32_t)(e0<<20)));
+ INSERT_WORDS(z, ix - ((int32_t)(e0<<20)), low);
for(i=0;i<2;i++) {
tx[i] = (double)((int32_t)(z));
z = (z-tx[i])*two24;
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