1e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng/* 2e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng * linux/arch/alpha/lib/memset.S 3e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng * 4e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng * This is an efficient (and small) implementation of the C library "memset()" 5e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng * function for the alpha. 6e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng * 7e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng * (C) Copyright 1996 Linus Torvalds 8e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng * 9e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng * This routine is "moral-ware": you are free to use it any way you wish, and 10e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng * the only obligation I put on you is a moral one: if you make any improvements 11e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng * to the routine, please send me your improvements for me to use similarly. 12e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng * 13e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng * The scheduling comments are according to the EV5 documentation (and done by 14e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng * hand, so they might well be incorrect, please do tell me about it..) 15e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng */ 16e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng 17e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng .set noat 18e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng .set noreorder 19e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng.text 20e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng .globl memset 21e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng .globl __memset 22e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng .globl __memsetw 23e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng .globl __constant_c_memset 24e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng .ent __memset 25e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng.align 5 26e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng__memset: 27e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng .frame $30,0,$26,0 28e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng .prologue 0 29e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng 30e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng and $17,255,$1 /* E1 */ 31e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng insbl $17,1,$17 /* .. E0 */ 32e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng bis $17,$1,$17 /* E0 (p-c latency, next cycle) */ 33e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng sll $17,16,$1 /* E1 (p-c latency, next cycle) */ 34e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng 35e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng bis $17,$1,$17 /* E0 (p-c latency, next cycle) */ 36e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng sll $17,32,$1 /* E1 (p-c latency, next cycle) */ 37e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng bis $17,$1,$17 /* E0 (p-c latency, next cycle) */ 38e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng ldq_u $31,0($30) /* .. E1 */ 39e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng 40e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng.align 5 41e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng__constant_c_memset: 42e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng addq $18,$16,$6 /* E0 */ 43e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng bis $16,$16,$0 /* .. E1 */ 44e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng xor $16,$6,$1 /* E0 */ 45e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng ble $18,end /* .. E1 */ 46e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng 47e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng bic $1,7,$1 /* E0 */ 48e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng beq $1,within_one_quad /* .. E1 (note EV5 zero-latency forwarding) */ 49e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng and $16,7,$3 /* E0 */ 50e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng beq $3,aligned /* .. E1 (note EV5 zero-latency forwarding) */ 51e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng 52e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng ldq_u $4,0($16) /* E0 */ 53e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng bis $16,$16,$5 /* .. E1 */ 54e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng insql $17,$16,$2 /* E0 */ 55e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng subq $3,8,$3 /* .. E1 */ 56e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng 57e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng addq $18,$3,$18 /* E0 $18 is new count ($3 is negative) */ 58e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng mskql $4,$16,$4 /* .. E1 (and possible load stall) */ 59e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng subq $16,$3,$16 /* E0 $16 is new aligned destination */ 60e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng bis $2,$4,$1 /* .. E1 */ 61e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng 62e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng bis $31,$31,$31 /* E0 */ 63e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng ldq_u $31,0($30) /* .. E1 */ 64e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng stq_u $1,0($5) /* E0 */ 65e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng bis $31,$31,$31 /* .. E1 */ 66e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng 67e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng.align 4 68e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Chengaligned: 69e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng sra $18,3,$3 /* E0 */ 70e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng and $18,7,$18 /* .. E1 */ 71e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng bis $16,$16,$5 /* E0 */ 72e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng beq $3,no_quad /* .. E1 */ 73e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng 74e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng.align 3 75e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Chengloop: 76e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng stq $17,0($5) /* E0 */ 77e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng subq $3,1,$3 /* .. E1 */ 78e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng addq $5,8,$5 /* E0 */ 79e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng bne $3,loop /* .. E1 */ 80e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng 81e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Chengno_quad: 82e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng bis $31,$31,$31 /* E0 */ 83e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng beq $18,end /* .. E1 */ 84e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng ldq $7,0($5) /* E0 */ 85e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng mskqh $7,$6,$2 /* .. E1 (and load stall) */ 86e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng 87e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng insqh $17,$6,$4 /* E0 */ 88e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng bis $2,$4,$1 /* .. E1 */ 89e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng stq $1,0($5) /* E0 */ 90e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng ret $31,($26),1 /* .. E1 */ 91e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng 92e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng.align 3 93e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Chengwithin_one_quad: 94e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng ldq_u $1,0($16) /* E0 */ 95e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng insql $17,$16,$2 /* E1 */ 96e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng mskql $1,$16,$4 /* E0 (after load stall) */ 97e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng bis $2,$4,$2 /* E0 */ 98e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng 99e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng mskql $2,$6,$4 /* E0 */ 100e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng mskqh $1,$6,$2 /* .. E1 */ 101e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng bis $2,$4,$1 /* E0 */ 102e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng stq_u $1,0($16) /* E0 */ 103e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng 104e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Chengend: 105e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng ret $31,($26),1 /* E1 */ 106e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng .end __memset 107e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng 108e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng .align 5 109e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng .ent __memsetw 110e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng__memsetw: 111e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng .prologue 0 112e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng 113e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng inswl $17,0,$1 /* E0 */ 114e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng inswl $17,2,$2 /* E0 */ 115e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng inswl $17,4,$3 /* E0 */ 116e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng or $1,$2,$1 /* .. E1 */ 117e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng inswl $17,6,$4 /* E0 */ 118e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng or $1,$3,$1 /* .. E1 */ 119e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng or $1,$4,$17 /* E0 */ 120e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng br __constant_c_memset /* .. E1 */ 121e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng 122e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng .end __memsetw 123e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Cheng 124e6e8a0bd7cffcc9ae2e0e75546fb12a19213d4aeBen Chengmemset = __memset 125