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| author | Mattias Engdegård <mattiase@acm.org> | 2022-03-16 17:01:57 +0100 |
|---|---|---|
| committer | Mattias Engdegård <mattiase@acm.org> | 2022-04-04 09:49:31 +0200 |
| commit | 530f163a7f4f1f0ead119b8d3c3dd9fa882af9b2 (patch) | |
| tree | ec3ea94eab8acd9dee73d3e0e21580d1611aea06 /src/fileio.c | |
| parent | f4833c88bbb3ca69f75e230a50bbd5edb4d5c00d (diff) | |
| download | emacs-530f163a7f4f1f0ead119b8d3c3dd9fa882af9b2.tar.gz | |
Speed up comparisons between 2 fixnums
Since <, <=, > and >= have their own byte-ops, the corresponding
functions are mostly used as arguments to higher-order functions.
This optimisation is particularly beneficial for sorting, where the
comparison function is time-critical.
* src/data.c (Flss, Fgtr, Fleq, Fgeq):
* src/fileio.c (Fcar_less_than_car):
Fast path for calls with 2 fixnum arguments.
Diffstat (limited to 'src/fileio.c')
| -rw-r--r-- | src/fileio.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/src/fileio.c b/src/fileio.c index 5d66a93ac6a..c418036fc6e 100644 --- a/src/fileio.c +++ b/src/fileio.c @@ -5523,7 +5523,10 @@ DEFUN ("car-less-than-car", Fcar_less_than_car, Scar_less_than_car, 2, 2, 0, doc: /* Return t if (car A) is numerically less than (car B). */) (Lisp_Object a, Lisp_Object b) { - return arithcompare (Fcar (a), Fcar (b), ARITH_LESS); + Lisp_Object ca = Fcar (a), cb = Fcar (b); + if (FIXNUMP (ca) && FIXNUMP (cb)) + return XFIXNUM (ca) < XFIXNUM (cb) ? Qt : Qnil; + return arithcompare (ca, cb, ARITH_LESS); } /* Build the complete list of annotations appropriate for writing out |