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| author | Paul Eggert <eggert@cs.ucla.edu> | 2013-10-07 14:37:19 -0700 |
|---|---|---|
| committer | Paul Eggert <eggert@cs.ucla.edu> | 2013-10-07 14:37:19 -0700 |
| commit | 595e113b15e2ce80b95d39d1851ce78f25ffa1f4 (patch) | |
| tree | 42c02de46a13e0af39fcc83de9d57c29e309f99e /lib/count-trailing-zeros.c | |
| parent | ddb317ba828f05eb48e98fda530443955485e75d (diff) | |
| download | emacs-595e113b15e2ce80b95d39d1851ce78f25ffa1f4.tar.gz | |
Improve support for popcount and counting trailing zeros.
Do this by using the Gnulib modules for this.
This should generate faster code on non-GCC, non-MSC platforms,
and make the code a bit more portable, at least in theory.
* admin/merge-gnulib (GNULIB_MODULES): Add count-one-bits
and count-trailing-zeros.
* lib/count-one-bits.c, lib/count-one-bits.h:
* lib/count-trailing-zeros.c, lib/count-trailing-zeros.h:
* m4/count-one-bits.m4, m4/count-trailing-zeros.m4:
New files, copied from gnulib.
* lib/gnulib.mk, m4/gnulib-comp.m4: Regenerate.
* nt/gnulib.mk: Merge changes from lib/gnulib.mk.
* src/data.c: Include <count-one-bits.h>, <count-trailing-zeros.h>.
(USE_MSC_POPCOUNT, POPCOUNT_STATIC_INLINE)
(NEED_GENERIC_POPCOUNT, popcount_size_t_generic)
(popcount_size_t_msc, popcount_size_t_gcc):
Remove; now done by Gnulib.
(popcount_size_t): Now a macro that defers to Gnulib.
(count_trailing_zero_bits): Return int, for consistency with
Gnulib and because Emacs prefers signed to unsigned int.
Don't assume that size_t is either unsigned int or unsigned long
or unsigned long long.
(size_t_to_host_endian): Do not assume that size_t is either
exactly 32 or exactly 64 bits wide.
* src/lisp.h (BITS_PER_SIZE_T): Define consistently with BITS_PER_LONG
etc., so that it's now an enum constant, not a macro.
No need to assume that it's either 32 or 64.
Fixes: debbugs:15550
Diffstat (limited to 'lib/count-trailing-zeros.c')
| -rw-r--r-- | lib/count-trailing-zeros.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/count-trailing-zeros.c b/lib/count-trailing-zeros.c new file mode 100644 index 00000000000..f3da8867428 --- /dev/null +++ b/lib/count-trailing-zeros.c @@ -0,0 +1,3 @@ +#include <config.h> +#define COUNT_TRAILING_ZEROS_INLINE _GL_EXTERN_INLINE +#include "count-trailing-zeros.h" |