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Date: Tue, 11 Jul 1995 11:50:48 -0700
From: Bruce Evans <bde>
Message-Id: <199507111850.LAA00782@freefall.cdrom.com>
To: CVS-commiters, cvs-sys
Subject: cvs commit: src/sys/libkern scanc.c
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bde         95/07/11 11:50:48

  Modified:    sys/libkern  scanc.c
  Log:
  Rearrange the inner loop of scanc() to get better code on i*86's
  (on an i486, 10 cycles (+ cache misses) instead of 15).  The
  change should be a no-op if the compiler is any good.  The best
  possible i*86 code for the same algorithm is only 1 more cycle
  faster on i486's so I don't want to bother implementing an
  assembler version.
  
  scanc() is a bottleneck for OPOST processing.  It is naturally
  about 4 times as slow as bcopy() on 32-bit systems.