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* lib/count-one-bits.h: Add comments. (From Bruno Haible.)

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* lib/count-one-bits.h: Don't include <limits.h>; no longer needed
given the changes below.
(COUNT_ONE_BITS): Use 'verify' rather than 'verify_true'.  Work
even on hosts that have padding bits beyond the supported 64.
(From Paul Eggert.)
This commit is contained in:
Ben Pfaff
2007-08-15 03:37:54 +00:00
parent 50236f7a99
commit 6684d992bf
2 changed files with 19 additions and 6 deletions
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ChangeLog
+11
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@@ -1,3 +1,14 @@
2007-08-14 Ben Pfaff <blp@gnu.org>
* lib/count-one-bits.h: Add comments. From Bruno Haible.
2007-08-14 Paul Eggert <eggert@cs.ucla.edu>
* lib/count-one-bits.h: Don't include <limits.h>; no longer needed
given the changes below.
(COUNT_ONE_BITS): Use 'verify' rather than 'verify_true'. Work
even on hosts that have padding bits beyond the supported 64.
2007-08-10 Paul Eggert <eggert@cs.ucla.edu>
* NEWS: In xstrtol, remove STRTOL_FATAL_ERROR and add xstrtol_fatal.
lib/count-one-bits.h
+8 -6
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@@ -20,19 +20,21 @@
#ifndef COUNT_ONE_BITS_H
# define COUNT_ONE_BITS_H 1
#include <limits.h>
#include <stdlib.h>
#include "verify.h"
/* Expand the code which computes the number of 1-bits of the local
variable 'x' of type TYPE (an unsigned integer type) and returns it
from the current function. */
#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR >= 4)
#define COUNT_ONE_BITS(BUILTIN, TYPE) \
return BUILTIN (x);
#else
#define COUNT_ONE_BITS(BUILTIN, TYPE) \
int count = count_one_bits_32 (x); \
if (CHAR_BIT * sizeof (TYPE) > 32) \
count += count_one_bits_32 (x >> 31 >> 1); \
(void) verify_true (CHAR_BIT * sizeof (TYPE) <= 64); \
#define COUNT_ONE_BITS(BUILTIN, TYPE) \
verify ((TYPE) -1 >> 31 >> 31 <= 3); /* TYPE has at most 64 bits */ \
int count = count_one_bits_32 (x); \
if (1 < (TYPE) -1 >> 31) /* TYPE has more than 32 bits? */ \
count += count_one_bits_32 (x >> 31 >> 1); \
return count;
/* Compute and return the the number of 1-bits set in the least