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