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

   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
   9 /* Generate 0x01 byte values for zero bytes using a SIMD instruction. */
  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
  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
  42 #endif /* _ASM_WORD_AT_A_TIME_H */