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Source at commit 0de2b2b3be81048189a32f7a3d3ba0ba9ec817b6 created 11 years 11 months ago. By Maarten ter Huurne, MIPS: JZ4740: Fixed value for round robin constant. | |
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1 | .global __sdivsi3 |
2 | .global __sdivsi3_1 |
3 | .global __sdivsi3_2 |
4 | .section .text..SHmedia32,"ax" |
5 | .align 2 |
6 | |
7 | /* inputs: r4,r5 */ |
8 | /* clobbered: r1,r18,r19,r20,r21,r25,tr0 */ |
9 | /* result in r0 */ |
10 | __sdivsi3: |
11 | __sdivsi3_1: |
12 | ptb __div_table,tr0 |
13 | gettr tr0,r20 |
14 | |
15 | __sdivsi3_2: |
16 | nsb r5, r1 |
17 | shlld r5, r1, r25 /* normalize; [-2 ..1, 1..2) in s2.62 */ |
18 | shari r25, 58, r21 /* extract 5(6) bit index (s2.4 with hole -1..1) */ |
19 | /* bubble */ |
20 | ldx.ub r20, r21, r19 /* u0.8 */ |
21 | shari r25, 32, r25 /* normalize to s2.30 */ |
22 | shlli r21, 1, r21 |
23 | muls.l r25, r19, r19 /* s2.38 */ |
24 | ldx.w r20, r21, r21 /* s2.14 */ |
25 | ptabs r18, tr0 |
26 | shari r19, 24, r19 /* truncate to s2.14 */ |
27 | sub r21, r19, r19 /* some 11 bit inverse in s1.14 */ |
28 | muls.l r19, r19, r21 /* u0.28 */ |
29 | sub r63, r1, r1 |
30 | addi r1, 92, r1 |
31 | muls.l r25, r21, r18 /* s2.58 */ |
32 | shlli r19, 45, r19 /* multiply by two and convert to s2.58 */ |
33 | /* bubble */ |
34 | sub r19, r18, r18 |
35 | shari r18, 28, r18 /* some 22 bit inverse in s1.30 */ |
36 | muls.l r18, r25, r0 /* s2.60 */ |
37 | muls.l r18, r4, r25 /* s32.30 */ |
38 | /* bubble */ |
39 | shari r0, 16, r19 /* s-16.44 */ |
40 | muls.l r19, r18, r19 /* s-16.74 */ |
41 | shari r25, 63, r0 |
42 | shari r4, 14, r18 /* s19.-14 */ |
43 | shari r19, 30, r19 /* s-16.44 */ |
44 | muls.l r19, r18, r19 /* s15.30 */ |
45 | xor r21, r0, r21 /* You could also use the constant 1 << 27. */ |
46 | add r21, r25, r21 |
47 | sub r21, r19, r21 |
48 | shard r21, r1, r21 |
49 | sub r21, r0, r0 |
50 | blink tr0, r63 |
51 | |
52 | /* This table has been generated by divtab.c . |
53 | Defects for bias -330: |
54 | Max defect: 6.081536e-07 at -1.000000e+00 |
55 | Min defect: 2.849516e-08 at 1.030651e+00 |
56 | Max 2nd step defect: 9.606539e-12 at -1.000000e+00 |
57 | Min 2nd step defect: 0.000000e+00 at 0.000000e+00 |
58 | Defect at 1: 1.238659e-07 |
59 | Defect at -2: 1.061708e-07 */ |
60 | |
61 | .balign 2 |
62 | .type __div_table,@object |
63 | .size __div_table,128 |
64 | /* negative division constants */ |
65 | .word -16638 |
66 | .word -17135 |
67 | .word -17737 |
68 | .word -18433 |
69 | .word -19103 |
70 | .word -19751 |
71 | .word -20583 |
72 | .word -21383 |
73 | .word -22343 |
74 | .word -23353 |
75 | .word -24407 |
76 | .word -25582 |
77 | .word -26863 |
78 | .word -28382 |
79 | .word -29965 |
80 | .word -31800 |
81 | /* negative division factors */ |
82 | .byte 66 |
83 | .byte 70 |
84 | .byte 75 |
85 | .byte 81 |
86 | .byte 87 |
87 | .byte 93 |
88 | .byte 101 |
89 | .byte 109 |
90 | .byte 119 |
91 | .byte 130 |
92 | .byte 142 |
93 | .byte 156 |
94 | .byte 172 |
95 | .byte 192 |
96 | .byte 214 |
97 | .byte 241 |
98 | .skip 16 |
99 | .global __div_table |
100 | __div_table: |
101 | .skip 16 |
102 | /* positive division factors */ |
103 | .byte 241 |
104 | .byte 214 |
105 | .byte 192 |
106 | .byte 172 |
107 | .byte 156 |
108 | .byte 142 |
109 | .byte 130 |
110 | .byte 119 |
111 | .byte 109 |
112 | .byte 101 |
113 | .byte 93 |
114 | .byte 87 |
115 | .byte 81 |
116 | .byte 75 |
117 | .byte 70 |
118 | .byte 66 |
119 | /* positive division constants */ |
120 | .word 31801 |
121 | .word 29966 |
122 | .word 28383 |
123 | .word 26864 |
124 | .word 25583 |
125 | .word 24408 |
126 | .word 23354 |
127 | .word 22344 |
128 | .word 21384 |
129 | .word 20584 |
130 | .word 19752 |
131 | .word 19104 |
132 | .word 18434 |
133 | .word 17738 |
134 | .word 17136 |
135 | .word 16639 |
136 |
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