Re: another m4sugar speedup

[Eric Blake]

Paul Eggert <eggert <at> CS.UCLA.EDU> writes:

> Thanks for these optimizations!  I installed the following minor
> further improvement, which on my host yielded a 3% further speedup for
> "autoconf -f" in coreutils.

Minor nit for future patches:

git-log _really_ wants a one-line description of the patch, separated by a 
blank line, before the rest of the commit description.  That's why I've been 
starting to add a summary line to all my ChangeLog entries, then reusing that 
summary line (plus one more newline) in my git commit.

For an example, this is 'git-log -4 --pretty=oneline' after my latest push:

987a33376699a92cb00962aedd4632d05bc7cef6 Another round of regex avoidance.
1a128bd6e62856ce29d98848a6d424d9f4f9715e Whitespace cleanup.
9174b63f95aaf58680bda01f1746dc6f44860a59 * lib/m4sugar/m4sugar.m4 (m4_shift2, 
m4_shift3): New macros. (m4_shiftn): Remove no-longer-needed optimization.  
Perhaps we should remove m4_shiftn entirely? (m4_case, b4_bmatch, m4_map_sep, 
m4_bpatsubsts, m4_join): Prefer m4_shift2 and m4_shift3 to m4_shiftn. * 
lib/autoconf/lang.m4 (_AC_LANG_DISPATCH): Likewise. * lib/m4sugar/m4sh.m4 
(AS_CASE, AS_IF): Likewise. * tests/autotest.at (AT_CHECK_AT_TEST): Likewise.
7b96e241f7c2eeae31b69ef6d64c20943ad2f599 Comment touchups.

-- 
Eric Blake