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Extend size_t support in pg_bitutils.h.

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Use a more compact notation that allows us to add more size_t variants
as required.  This will be used by a later commit.

Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/CA%2BhUKG%2B7dSX1XF8yFGmYk-%3D48dbjH2kmzZj16XvhbrWP-9BzRg%40mail.gmail.com
This commit is contained in:
Thomas Munro 2022-07-22 09:40:39 +12:00
parent a4f09ef229
commit 3225399021
1 changed files with 12 additions and 20 deletions
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32
src/include/port/pg_bitutils.h
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@ -175,16 +175,6 @@ pg_nextpower2_64(uint64 num)
return ((uint64) 1) << (pg_leftmost_one_pos64(num) + 1); return ((uint64) 1) << (pg_leftmost_one_pos64(num) + 1);
} }
/*
* pg_nextpower2_size_t
* Returns the next higher power of 2 above 'num', for a size_t input.
*/
#if SIZEOF_SIZE_T == 4
#define pg_nextpower2_size_t(num) pg_nextpower2_32(num)
#else
#define pg_nextpower2_size_t(num) pg_nextpower2_64(num)
#endif
/* /*
* pg_prevpower2_32 * pg_prevpower2_32
* Returns the next lower power of 2 below 'num', or 'num' if it's * Returns the next lower power of 2 below 'num', or 'num' if it's
@ -211,16 +201,6 @@ pg_prevpower2_64(uint64 num)
return ((uint64) 1) << pg_leftmost_one_pos64(num); return ((uint64) 1) << pg_leftmost_one_pos64(num);
} }
/*
* pg_prevpower2_size_t
* Returns the next lower power of 2 below 'num', for a size_t input.
*/
#if SIZEOF_SIZE_T == 4
#define pg_prevpower2_size_t(num) pg_prevpower2_32(num)
#else
#define pg_prevpower2_size_t(num) pg_prevpower2_64(num)
#endif
/* /*
* pg_ceil_log2_32 * pg_ceil_log2_32
* Returns equivalent of ceil(log2(num)) * Returns equivalent of ceil(log2(num))
@ -299,4 +279,16 @@ pg_rotate_left32(uint32 word, int n)
return (word << n) | (word >> (32 - n)); return (word << n) | (word >> (32 - n));
} }
/* size_t variants of the above, as required */
#if SIZEOF_SIZE_T == 4
#define pg_leftmost_one_pos_size_t pg_leftmost_one_pos32
#define pg_nextpower2_size_t pg_nextpower2_32
#define pg_prevpower2_size_t pg_prevpower2_32
#else
#define pg_leftmost_one_pos_size_t pg_leftmost_one_pos64
#define pg_nextpower2_size_t pg_nextpower2_64
#define pg_prevpower2_size_t pg_prevpower2_64
#endif
#endif /* PG_BITUTILS_H */ #endif /* PG_BITUTILS_H */