cvs commit: src/sys/libkern scanc.c

[Bruce Evans]

bde         2003/07/25 08:54:23 PDT

  FreeBSD src repository

  Modified files:
    sys/libkern          scanc.c 
  Log:
  Backed out the micro-optimization in 1.4.  It was to help gcc-2.6.3
  on i486's (and probably i386's), but it has had very little effect
  since gcc-2.7 or gcc-2.95.  With gcc-3.3, it gave a small
  pessimization for at least i386's, athlon-xp's and pentium4's, a
  small optimization (I think) for pentium1's, and made no difference
  for i386's.  (movzbl is best for all the later processors, and the
  micro-optimization was to stop it being used on i486's.)
  
  Revision  Changes    Path
  1.10      +1 -6      src/sys/libkern/scanc.c