1 #ifndef __ASM_SH_WORD_AT_A_TIME_H 2 #define __ASM_SH_WORD_AT_A_TIME_H 3 4 #ifdef CONFIG_CPU_BIG_ENDIAN 5 # include <asm-generic/word-at-a-time.h> 6 #else 7 /* 8 * Little-endian version cribbed from x86. 9 */ 10 struct word_at_a_time { 11 const unsigned long one_bits, high_bits; 12 }; 13 14 #define WORD_AT_A_TIME_CONSTANTS { REPEAT_BYTE(0x01), REPEAT_BYTE(0x80) } 15 16 /* Carl Chatfield / Jan Achrenius G+ version for 32-bit */ 17 static inline long count_masked_bytes(long mask) 18 { 19 /* (000000 0000ff 00ffff ffffff) -> ( 1 1 2 3 ) */ 20 long a = (0x0ff0001+mask) >> 23; 21 /* Fix the 1 for 00 case */ 22 return a & mask; 23 } 24 25 /* Return nonzero if it has a zero */ 26 static inline unsigned long has_zero(unsigned long a, unsigned long *bits, const struct word_at_a_time *c) 27 { 28 unsigned long mask = ((a - c->one_bits) & ~a) & c->high_bits; 29 *bits = mask; 30 return mask; 31 } 32 33 static inline unsigned long prep_zero_mask(unsigned long a, unsigned long bits, const struct word_at_a_time *c) 34 { 35 return bits; 36 } 37 38 static inline unsigned long create_zero_mask(unsigned long bits) 39 { 40 bits = (bits - 1) & ~bits; 41 return bits >> 7; 42 } 43 44 /* The mask we created is directly usable as a bytemask */ 45 #define zero_bytemask(mask) (mask) 46 47 static inline unsigned long find_zero(unsigned long mask) 48 { 49 return count_masked_bytes(mask); 50 } 51 #endif 52 53 #endif 54