word-at-a-time.h (1321B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef __ASM_SH_WORD_AT_A_TIME_H 3#define __ASM_SH_WORD_AT_A_TIME_H 4 5#ifdef CONFIG_CPU_BIG_ENDIAN 6# include <asm-generic/word-at-a-time.h> 7#else 8/* 9 * Little-endian version cribbed from x86. 10 */ 11struct word_at_a_time { 12 const unsigned long one_bits, high_bits; 13}; 14 15#define WORD_AT_A_TIME_CONSTANTS { REPEAT_BYTE(0x01), REPEAT_BYTE(0x80) } 16 17/* Carl Chatfield / Jan Achrenius G+ version for 32-bit */ 18static inline long count_masked_bytes(long mask) 19{ 20 /* (000000 0000ff 00ffff ffffff) -> ( 1 1 2 3 ) */ 21 long a = (0x0ff0001+mask) >> 23; 22 /* Fix the 1 for 00 case */ 23 return a & mask; 24} 25 26/* Return nonzero if it has a zero */ 27static inline unsigned long has_zero(unsigned long a, unsigned long *bits, const struct word_at_a_time *c) 28{ 29 unsigned long mask = ((a - c->one_bits) & ~a) & c->high_bits; 30 *bits = mask; 31 return mask; 32} 33 34static inline unsigned long prep_zero_mask(unsigned long a, unsigned long bits, const struct word_at_a_time *c) 35{ 36 return bits; 37} 38 39static inline unsigned long create_zero_mask(unsigned long bits) 40{ 41 bits = (bits - 1) & ~bits; 42 return bits >> 7; 43} 44 45/* The mask we created is directly usable as a bytemask */ 46#define zero_bytemask(mask) (mask) 47 48static inline unsigned long find_zero(unsigned long mask) 49{ 50 return count_masked_bytes(mask); 51} 52#endif 53 54#endif