/* count-one-bits.h -- counts the number of 1-bits in a word.
- Copyright (C) 2007-2008 Free Software Foundation, Inc.
+ Copyright (C) 2007-2011 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
return BUILTIN (x);
#else
#define COUNT_ONE_BITS(BUILTIN, TYPE) \
+ /* This condition is written so as to avoid shifting by more than \
+ 31 bits at once, and also avoids a random HP-UX cc bug. */ \
verify (((TYPE) -1 >> 31 >> 31 >> 2) == 0); /* 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
+/* Compute and return the number of 1-bits set in the least
significant 32 bits of X. */
static inline int
count_one_bits_32 (unsigned int x)