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.

0 files changed, 0 insertions, 0 deletions