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| author | Tom Tromey <tom@tromey.com> | 2018-07-07 14:22:44 -0600 |
|---|---|---|
| committer | Tom Tromey <tom@tromey.com> | 2018-07-12 22:12:27 -0600 |
| commit | a770fb44288c75fa2b0471ceaf00bf741376e40f (patch) | |
| tree | 263136cf11b50104797d7642247b87fab2814ded /src | |
| parent | c7e393bc4130c871a92fef7e9ac0c7c1832aa614 (diff) | |
| download | emacs-a770fb44288c75fa2b0471ceaf00bf741376e40f.tar.gz | |
Make logcount handle bignums
* src/data.c (Flogcount): Handle bignums.
* test/src/data-tests.el (data-tests-logcount): New test.
Diffstat (limited to 'src')
| -rw-r--r-- | src/data.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/src/data.c b/src/data.c index c9504694e37..2e366b5313f 100644 --- a/src/data.c +++ b/src/data.c @@ -3184,7 +3184,22 @@ of VALUE. If VALUE is negative, return the number of zero bits in the representation. */) (Lisp_Object value) { - CHECK_FIXNUM (value); + CHECK_INTEGER (value); + + if (BIGNUMP (value)) + { + if (mpz_cmp_si (XBIGNUM (value)->value, 0) >= 0) + return make_fixnum (mpz_popcount (XBIGNUM (value)->value)); + mpz_t tem; + mpz_init (tem); + mpz_neg (tem, XBIGNUM (value)->value); + mpz_sub_ui (tem, tem, 1); + Lisp_Object result = make_fixnum (mpz_popcount (tem)); + mpz_clear (tem); + return result; + } + + eassume (FIXNUMP (value)); EMACS_INT v = XINT (value) < 0 ? -1 - XINT (value) : XINT (value); return make_fixnum (EMACS_UINT_WIDTH <= UINT_WIDTH ? count_one_bits (v) |