Date: Sun, 9 Oct 2005 04:29:08 +0000 (UTC) From: Bruce Evans <bde@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/lib/msun/src e_rem_pio2f.c Message-ID: <200510090429.j994T89l033987@repoman.freebsd.org>
next in thread | raw e-mail | index | archive | help
bde 2005-10-09 04:29:08 UTC
FreeBSD src repository
Modified files:
lib/msun/src e_rem_pio2f.c
Log:
Oops, the last-minute optimization in rev.1.8 wasn't a good idea. The
17+17+24 bit pi/2 must only be used when subtraction of the first 2
terms in it from the arg is exact. This happens iff the the arg in
bits is one of the 2**17[-1] values on each side of (float)(pi/2).
Revert to the algorithm in rev.1.7 and only fix its threshold for using
the 3-term pi/2. Use the threshold that maximizes the number of values
for which the 3-term pi/2 is used, subject to not changing the algorithm
for comparing with the threshold. The 3-term pi/2 ends up being used
for about half of its usable range (about 64K values on each side).
Revision Changes Path
1.10 +18 -7 src/lib/msun/src/e_rem_pio2f.c
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200510090429.j994T89l033987>