cvs commit: src/lib/msun/src e_expf.c

[Bruce Evans]

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