diff options
Diffstat (limited to 'kernel/arch/tile/include/asm/word-at-a-time.h')
| -rw-r--r-- | kernel/arch/tile/include/asm/word-at-a-time.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/kernel/arch/tile/include/asm/word-at-a-time.h b/kernel/arch/tile/include/asm/word-at-a-time.h new file mode 100644 index 000000000..b66a693c2 --- /dev/null +++ b/kernel/arch/tile/include/asm/word-at-a-time.h @@ -0,0 +1,42 @@ +#ifndef _ASM_WORD_AT_A_TIME_H +#define _ASM_WORD_AT_A_TIME_H + +#include <asm/byteorder.h> + +struct word_at_a_time { /* unused */ }; +#define WORD_AT_A_TIME_CONSTANTS {} + +/* Generate 0x01 byte values for zero bytes using a SIMD instruction. */ +static inline unsigned long has_zero(unsigned long val, unsigned long *data, + const struct word_at_a_time *c) +{ +#ifdef __tilegx__ + unsigned long mask = __insn_v1cmpeqi(val, 0); +#else /* tilepro */ + unsigned long mask = __insn_seqib(val, 0); +#endif + *data = mask; + return mask; +} + +/* These operations are both nops. */ +#define prep_zero_mask(val, data, c) (data) +#define create_zero_mask(data) (data) + +/* And this operation just depends on endianness. */ +static inline long find_zero(unsigned long mask) +{ +#ifdef __BIG_ENDIAN + return __builtin_clzl(mask) >> 3; +#else + return __builtin_ctzl(mask) >> 3; +#endif +} + +#ifdef __BIG_ENDIAN +#define zero_bytemask(mask) (~1ul << (63 - __builtin_clzl(mask))) +#else +#define zero_bytemask(mask) ((2ul << __builtin_ctzl(mask)) - 1) +#endif + +#endif /* _ASM_WORD_AT_A_TIME_H */ |