projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 5bf6c07a CM |
1 | #ifndef _ASM_WORD_AT_A_TIME_H |
| 2 | #define _ASM_WORD_AT_A_TIME_H | |
| 3 | ||
| 4 | #include <asm/byteorder.h> | |
| 5 | ||
| 6 | struct word_at_a_time { /* unused */ }; | |
| 7 | #define WORD_AT_A_TIME_CONSTANTS {} | |
| 8 | ||
| c753bf34 | 9 | /* Generate 0x01 byte values for zero bytes using a SIMD instruction. */ |
| 5bf6c07a CM |
10 | static inline unsigned long has_zero(unsigned long val, unsigned long *data, |
| 11 | const struct word_at_a_time *c) | |
| 12 | { | |
| 13 | #ifdef __tilegx__ | |
| 14 | unsigned long mask = __insn_v1cmpeqi(val, 0); | |
| 15 | #else /* tilepro */ | |
| 16 | unsigned long mask = __insn_seqib(val, 0); | |
| 17 | #endif | |
| 18 | *data = mask; | |
| 19 | return mask; | |
| 20 | } | |
| 21 | ||
| 22 | /* These operations are both nops. */ | |
| 23 | #define prep_zero_mask(val, data, c) (data) | |
| 24 | #define create_zero_mask(data) (data) | |
| 25 | ||
| 26 | /* And this operation just depends on endianness. */ | |
| 27 | static inline long find_zero(unsigned long mask) | |
| 28 | { | |
| 29 | #ifdef __BIG_ENDIAN | |
| 30 | return __builtin_clzl(mask) >> 3; | |
| 31 | #else | |
| 32 | return __builtin_ctzl(mask) >> 3; | |
| 33 | #endif | |
| 34 | } | |
| 35 | ||
| c753bf34 CM |
36 | #ifdef __BIG_ENDIAN |
| 37 | #define zero_bytemask(mask) (~1ul << (63 - __builtin_clzl(mask))) | |
| 38 | #else | |
| 39 | #define zero_bytemask(mask) ((2ul << __builtin_ctzl(mask)) - 1) | |
| 40 | #endif | |
| 41 | ||
| 5bf6c07a | 42 | #endif /* _ASM_WORD_AT_A_TIME_H */ |