Date: Wed, 6 Feb 2008 06:35:21 +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_expf.c Message-ID: <200802060635.m166ZLNW076441@repoman.freebsd.org>
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bde 2008-02-06 06:35:21 UTC
FreeBSD src repository
Modified files:
lib/msun/src e_expf.c
Log:
As for the float trig functions and logf, use a minimax polynomial
that is specialized for float precision. The new polynomial has degree
5 instead of 11, and a maximum error of 2**-27.74 ulps instead
of 2**-30.64. This doesn't affect the final error significantly; the
maximum error was and is about 0.9101 ulps on amd64 -01 and the number
of cases with an error of > 0.5 ulps is actually reduced by epsilon
despite the larger error in the polynomial.
This is about 15% faster on amd64 (A64), i386 (A64) and ia64. The asm
version is still used instead of this on i386 since it is faster and
more accurate.
Revision Changes Path
1.12 +7 -6 src/lib/msun/src/e_expf.c
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