Commit | Line | Data |
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1da177e4 | 1 | /* |
f30c2269 | 2 | * linux/arch/alpha/lib/memset.S |
1da177e4 LT |
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 | |
a47e5bb5 | 22 | .globl ___memset |
1da177e4 LT |
23 | .globl __memsetw |
24 | .globl __constant_c_memset | |
a47e5bb5 RH |
25 | |
26 | .ent ___memset | |
1da177e4 | 27 | .align 5 |
a47e5bb5 | 28 | ___memset: |
1da177e4 LT |
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 */ | |
a47e5bb5 | 108 | .end ___memset |
1da177e4 LT |
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 | ||
a47e5bb5 RH |
126 | memset = ___memset |
127 | __memset = ___memset |