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| H A D | e_expf.c | diff ce56838fdcc468afb2222cb50a326ef08c156264 Wed Feb 06 07:35:21 CET 2008 Bruce Evans <bde@FreeBSD.org> 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.
diff ce56838fdcc468afb2222cb50a326ef08c156264 Wed Feb 06 07:35:21 CET 2008 Bruce Evans <bde@FreeBSD.org> 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.
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