memcoll: clarify sizes versus lengths, document better, and tweak perf

[pspp] / ChangeLog

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+2010-07-12  Paul R. Eggert  <eggert@cs.ucla.edu>
+
+       memcoll: clarify sizes versus lengths, document better, and tweak perf
+       * lib/memcoll.c (strcoll_loop, memcoll0):
+       Improve quality of descriptive comments.  Name variables
+       consistently as to whether they are lengths (which do not include
+       terminating null) versus sizes (which do).
+       * lib/xmemcoll.c (xmemcoll0): Likewise.
+       * lib/memcoll.c (strcoll_loop): Tweak the way that the diff is
+       returned when s1size == 0; this is easier to compile and saves
+       about 17% of memcoll's code space on x86-64 with GCC 4.1.2.
+
 2010-07-12  Bruno Haible  <bruno@clisp.org>
 
        Tests for module '_Exit'.