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| author | Paul Eggert <eggert@cs.ucla.edu> | 2023-05-14 18:51:24 -0700 |
|---|---|---|
| committer | Paul Eggert <eggert@cs.ucla.edu> | 2023-05-14 19:28:13 -0700 |
| commit | 0f5b1fcdf0be8c1b3084518f1c4f6f375828094b (patch) | |
| tree | ecd95c49031b77dcbce4922b5f71e87c6f3f2d0c /src/floatfns.c | |
| parent | 3cd8ce87d298c3e0ca1e2336400d06c1a8794381 (diff) | |
| download | emacs-0f5b1fcdf0be8c1b3084518f1c4f6f375828094b.tar.gz | |
Help GCC compute modiff_incr
* src/floatfns.c: Don’t include count-leading-zeros.h,
since we no longer use it directly.
(ecount_leading_zeros): Remove.
(Flogb): Use elogb instead of doing it by hand.
* src/lisp.h: Include count-leading-zeros.h.
(elogb): New macro.
(modiff_incr): Use it so that on typical platforms we
use a hardware instruction instead of a loop.
Diffstat (limited to 'src/floatfns.c')
| -rw-r--r-- | src/floatfns.c | 12 |
1 files changed, 1 insertions, 11 deletions
diff --git a/src/floatfns.c b/src/floatfns.c index 13f0ca3e129..e40364f8188 100644 --- a/src/floatfns.c +++ b/src/floatfns.c @@ -55,8 +55,6 @@ along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>. */ #include <math.h> -#include <count-leading-zeros.h> - /* Emacs needs proper handling of +/-inf; correct printing as well as important packages depend on it. Make sure the user didn't specify -ffinite-math-only, either directly or implicitly with -Ofast or @@ -304,14 +302,6 @@ DEFUN ("float", Ffloat, Sfloat, 1, 1, 0, return FLOATP (arg) ? arg : make_float (XFLOATINT (arg)); } -static int -ecount_leading_zeros (EMACS_UINT x) -{ - return (EMACS_UINT_WIDTH == UINT_WIDTH ? count_leading_zeros (x) - : EMACS_UINT_WIDTH == ULONG_WIDTH ? count_leading_zeros_l (x) - : count_leading_zeros_ll (x)); -} - DEFUN ("logb", Flogb, Slogb, 1, 1, 0, doc: /* Returns largest integer <= the base 2 log of the magnitude of ARG. This is the same as the exponent of a float. */) @@ -338,7 +328,7 @@ This is the same as the exponent of a float. */) EMACS_INT i = XFIXNUM (arg); if (i == 0) return make_float (-HUGE_VAL); - value = EMACS_UINT_WIDTH - 1 - ecount_leading_zeros (eabs (i)); + value = elogb (eabs (i)); } return make_fixnum (value); |