cvs commit: src/lib/msun/src k_tanf.c math_private.h s_tanf.c
bde at FreeBSD.org
Wed Nov 23 14:27:57 GMT 2005
bde 2005-11-23 14:27:56 UTC
FreeBSD src repository
lib/msun/src k_tanf.c math_private.h s_tanf.c
Use only double precision for "kernel" tanf (except for returning float).
This is a minor interface change. The function is renamed from
__kernel_tanf() to __kernel_tandf() so that misues of it will cause
link errors and not crashes.
This version is a routine translation with no special optimizations
for accuracy or efficiency. It gives an unimportant increase in
accuracy, from ~0.9 ulps to 0.5285 ulps. Almost all of the error is
from the minimax polynomial (~0.03 ulps and the final rounding step
(< 0.5 ulps). It gives strange differences in efficiency in the -5
to +10% range, with -O1 fairly consistently becoming faster and -O2
slower on AXP and A64 with gcc-3.3 and gcc-3.4.
Revision Changes Path
1.16 +17 -20 src/lib/msun/src/k_tanf.c
1.19 +1 -1 src/lib/msun/src/math_private.h
1.13 +2 -8 src/lib/msun/src/s_tanf.c
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