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feeeff5c | 1 | /* Signed 32 bit modulo optimized for Epiphany. |
a945c346 | 2 | Copyright (C) 2009-2024 Free Software Foundation, Inc. |
feeeff5c JR |
3 | Contributed by Embecosm on behalf of Adapteva, Inc. |
4 | ||
5 | This file is part of GCC. | |
6 | ||
7 | This file is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU General Public License as published by the | |
9 | Free Software Foundation; either version 3, or (at your option) any | |
10 | later version. | |
11 | ||
12 | This file is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | General Public License for more details. | |
16 | ||
17 | Under Section 7 of GPL version 3, you are granted additional | |
18 | permissions described in the GCC Runtime Library Exception, version | |
19 | 3.1, as published by the Free Software Foundation. | |
20 | ||
21 | You should have received a copy of the GNU General Public License and | |
22 | a copy of the GCC Runtime Library Exception along with this program; | |
23 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
24 | <http://www.gnu.org/licenses/>. */ | |
25 | ||
26 | #include "epiphany-asm.h" | |
27 | ||
28 | FSTAB (__modsi3,T_INT) | |
29 | .global SYM(__modsi3) | |
30 | .balign 4 | |
31 | HIDDEN_FUNC(__modsi3) | |
32 | SYM(__modsi3): | |
33 | asr r17,r0,31 ; save sign | |
34 | mov r2,0 | |
35 | sub r3,r2,r0 | |
36 | movgt r0,r3 | |
37 | sub r3,r2,r1 | |
38 | movgt r1,r3 | |
39 | movt r2,0xa000 ; 0xa0000000 | |
40 | orr r3,r2,r0 | |
41 | lsr r15,r0,16 | |
42 | movt r15,0xa800 | |
43 | movne r3,r15 | |
44 | lsr r16,r2,2 ; 0x28000000 | |
45 | and r15,r3,r16 | |
46 | fadd r12,r3,r15 | |
47 | orr r3,r2,r1 | |
48 | lsr r2,r1,16 | |
49 | movt r2,0xa800 | |
50 | movne r3,r2 | |
51 | and r2,r16,r3 | |
52 | fadd r3,r3,r2 | |
53 | sub r2,r0,r1 | |
54 | bltu .Lret_a | |
55 | lsr r12,r12,23 | |
56 | mov r2,%low(.L0step) | |
57 | movt r2,%high(.L0step) | |
58 | lsr r3,r3,23 | |
59 | sub r3,r12,r3 ; calculate bit number difference. | |
60 | lsl r3,r3,3 | |
61 | sub r2,r2,r3 | |
62 | jr r2 | |
63 | /* lsl_l r2,r1,n` sub r2,r0,r2` movgteu r0,r2 */ | |
64 | #define STEP(n) .long 0x0006441f | (n) << 5` sub r2,r0,r2` movgteu r0,r2 | |
65 | .balign 8,,2 | |
66 | STEP(31)` STEP(30)` STEP(29)` STEP(28)` | |
67 | STEP(27)` STEP(26)` STEP(25)` STEP(24)` | |
68 | STEP(23)` STEP(22)` STEP(21)` STEP(20)` | |
69 | STEP(19)` STEP(18)` STEP(17)` STEP(16)` | |
70 | STEP(15)` STEP(14)` STEP(13)` STEP(12)` | |
71 | STEP(11)` STEP(10)` STEP(9)` STEP(8)` | |
72 | STEP(7)` STEP(6)` STEP(5)` STEP(4)` STEP(3)` STEP(2)` STEP(1) | |
73 | .L0step:STEP(0) | |
74 | .Lret_a:eor r0,r0,r17 ; restore sign | |
75 | sub r0,r0,r17 | |
76 | rts | |
77 | ENDFUNC(__modsi3) |