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word-at-a-time.h: support zero_bytemask() on alpha and tile 

Both alpha and tile needed implementations of zero_bytemask.

The alpha version is untested.

Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
This commit is contained in:
Chris Metcalf 2015-10-06 14:20:45 -04:00
parent 19c22f3a29
commit c753bf34c9
2 changed files with 9 additions and 1 deletions
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2
arch/alpha/include/asm/word-at-a-time.h
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@ -52,4 +52,6 @@ static inline unsigned long find_zero(unsigned long bits)
#endif
}
#define zero_bytemask(mask) ((2ul << (find_zero(mask) * 8)) - 1)
#endif /* _ASM_WORD_AT_A_TIME_H */

8
arch/tile/include/asm/word-at-a-time.h
View File

@ -6,7 +6,7 @@
struct word_at_a_time { /* unused */ };
#define WORD_AT_A_TIME_CONSTANTS {}
/* Generate 0x01 byte values for non-zero bytes using a SIMD instruction. */
/* 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)
{
@ -33,4 +33,10 @@ static inline long find_zero(unsigned long mask)
#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 */