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Add lg_ceil to bit_util.

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Also, add the bit_util test back to the Makefile.
This commit is contained in:
David Goldblatt
2017-12-22 15:14:44 -08:00
committed by David Goldblatt
parent 07b89c7673
commit 2f07e92adb
3 changed files with 76 additions and 68 deletions
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87
include/jemalloc/internal/bit_util.h
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@@ -160,74 +160,27 @@ lg_floor(size_t x) {
}
#endif
BIT_UTIL_INLINE unsigned
lg_ceil(size_t x) {
return lg_floor(x) + ((x & (x - 1)) == 0 ? 0 : 1);
}
#undef BIT_UTIL_INLINE
/* A compile-time version of lg_ceil */
#define LG_CEIL(x) ( \
(x) <= (1ULL << 0ULL) ? 0 : \
(x) <= (1ULL << 1ULL) ? 1 : \
(x) <= (1ULL << 2ULL) ? 2 : \
(x) <= (1ULL << 3ULL) ? 3 : \
(x) <= (1ULL << 4ULL) ? 4 : \
(x) <= (1ULL << 5ULL) ? 5 : \
(x) <= (1ULL << 6ULL) ? 6 : \
(x) <= (1ULL << 7ULL) ? 7 : \
(x) <= (1ULL << 8ULL) ? 8 : \
(x) <= (1ULL << 9ULL) ? 9 : \
(x) <= (1ULL << 10ULL) ? 10 : \
(x) <= (1ULL << 11ULL) ? 11 : \
(x) <= (1ULL << 12ULL) ? 12 : \
(x) <= (1ULL << 13ULL) ? 13 : \
(x) <= (1ULL << 14ULL) ? 14 : \
(x) <= (1ULL << 15ULL) ? 15 : \
(x) <= (1ULL << 16ULL) ? 16 : \
(x) <= (1ULL << 17ULL) ? 17 : \
(x) <= (1ULL << 18ULL) ? 18 : \
(x) <= (1ULL << 19ULL) ? 19 : \
(x) <= (1ULL << 20ULL) ? 20 : \
(x) <= (1ULL << 21ULL) ? 21 : \
(x) <= (1ULL << 22ULL) ? 22 : \
(x) <= (1ULL << 23ULL) ? 23 : \
(x) <= (1ULL << 24ULL) ? 24 : \
(x) <= (1ULL << 25ULL) ? 25 : \
(x) <= (1ULL << 26ULL) ? 26 : \
(x) <= (1ULL << 27ULL) ? 27 : \
(x) <= (1ULL << 28ULL) ? 28 : \
(x) <= (1ULL << 29ULL) ? 29 : \
(x) <= (1ULL << 30ULL) ? 30 : \
(x) <= (1ULL << 31ULL) ? 31 : \
(x) <= (1ULL << 32ULL) ? 32 : \
(x) <= (1ULL << 33ULL) ? 33 : \
(x) <= (1ULL << 34ULL) ? 34 : \
(x) <= (1ULL << 35ULL) ? 35 : \
(x) <= (1ULL << 36ULL) ? 36 : \
(x) <= (1ULL << 37ULL) ? 37 : \
(x) <= (1ULL << 38ULL) ? 38 : \
(x) <= (1ULL << 39ULL) ? 39 : \
(x) <= (1ULL << 40ULL) ? 40 : \
(x) <= (1ULL << 41ULL) ? 41 : \
(x) <= (1ULL << 42ULL) ? 42 : \
(x) <= (1ULL << 43ULL) ? 43 : \
(x) <= (1ULL << 44ULL) ? 44 : \
(x) <= (1ULL << 45ULL) ? 45 : \
(x) <= (1ULL << 46ULL) ? 46 : \
(x) <= (1ULL << 47ULL) ? 47 : \
(x) <= (1ULL << 48ULL) ? 48 : \
(x) <= (1ULL << 49ULL) ? 49 : \
(x) <= (1ULL << 50ULL) ? 50 : \
(x) <= (1ULL << 51ULL) ? 51 : \
(x) <= (1ULL << 52ULL) ? 52 : \
(x) <= (1ULL << 53ULL) ? 53 : \
(x) <= (1ULL << 54ULL) ? 54 : \
(x) <= (1ULL << 55ULL) ? 55 : \
(x) <= (1ULL << 56ULL) ? 56 : \
(x) <= (1ULL << 57ULL) ? 57 : \
(x) <= (1ULL << 58ULL) ? 58 : \
(x) <= (1ULL << 59ULL) ? 59 : \
(x) <= (1ULL << 60ULL) ? 60 : \
(x) <= (1ULL << 61ULL) ? 61 : \
(x) <= (1ULL << 62ULL) ? 62 : \
(x) <= (1ULL << 63ULL) ? 63 : \
64)
/* A compile-time version of lg_floor and lg_ceil. */
#define LG_FLOOR_1(x) 0
#define LG_FLOOR_2(x) (x < (1ULL << 1) ? LG_FLOOR_1(x) : 1 + LG_FLOOR_1(x >> 1))
#define LG_FLOOR_4(x) (x < (1ULL << 2) ? LG_FLOOR_2(x) : 2 + LG_FLOOR_2(x >> 2))
#define LG_FLOOR_8(x) (x < (1ULL << 4) ? LG_FLOOR_4(x) : 4 + LG_FLOOR_4(x >> 4))
#define LG_FLOOR_16(x) (x < (1ULL << 8) ? LG_FLOOR_8(x) : 8 + LG_FLOOR_8(x >> 8))
#define LG_FLOOR_32(x) (x < (1ULL << 16) ? LG_FLOOR_16(x) : 16 + LG_FLOOR_16(x >> 16))
#define LG_FLOOR_64(x) (x < (1ULL << 32) ? LG_FLOOR_32(x) : 32 + LG_FLOOR_32(x >> 32))
#if LG_SIZEOF_PTR == 2
# define LG_FLOOR(x) LG_FLOOR_32((x))
#else
# define LG_FLOOR(x) LG_FLOOR_64((x))
#endif
#define LG_CEIL(x) (LG_FLOOR(x) + (((x) & ((x) - 1)) == 0 ? 0 : 1))
#endif /* JEMALLOC_INTERNAL_BIT_UTIL_H */