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feeeff5c | 1 | /* Signed 32 bit division optimized for Epiphany. |
cbe34bb5 | 2 | Copyright (C) 2009-2017 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 (__divsi3,T_INT) | |
29 | .global SYM(__divsi3) | |
30 | .balign 4 | |
31 | HIDDEN_FUNC(__divsi3) | |
32 | SYM(__divsi3): | |
33 | mov r12,0 | |
34 | sub r2,r12,r0 | |
35 | movlt r2,r0 | |
36 | sub r3,r12,r1 | |
37 | movlt r3,r1 | |
38 | sub r19,r2,r3 | |
39 | bltu .Lret0 | |
40 | movt r12,0x4000 | |
41 | orr r16,r2,r12 | |
42 | orr r18,r3,r12 | |
43 | fsub r16,r16,r12 | |
44 | fsub r18,r18,r12 | |
45 | movt r12,0x4b80 | |
46 | lsr r19,r3,23 | |
47 | lsr r17,r2,23 | |
48 | movt r17,0x4b80 | |
49 | fsub r17,r17,r12 | |
50 | movt r19,0x4b80 | |
51 | fsub r19,r19,r12 | |
52 | mov r12,%low(.L0step) | |
53 | movt r12,%high(.L0step) | |
54 | mov r20,0 | |
55 | mov r21,1 | |
56 | movne r16,r17 | |
57 | lsr r17,r3,23 | |
58 | movne r18,r19 | |
59 | eor r1,r1,r0 ; save sign | |
60 | asr r19,r1,31 | |
61 | lsr r1,r16,23 | |
62 | lsr r0,r18,23 | |
63 | sub r1,r1,r0 ; calculate bit number difference. | |
64 | lsl r3,r3,r1 | |
65 | lsr r16,r3,1 | |
66 | lsl r0,r21,r1 | |
67 | lsl r1,r1,3 | |
68 | sub r12,r12,r1 | |
69 | sub r3,r2,r3 | |
70 | movgteu r2,r3 | |
71 | movgteu r20,r0 | |
72 | lsr r0,r0,1 | |
73 | add r17,r0,r20 | |
74 | sub r3,r2,r16 | |
75 | movgteu r2,r3 | |
76 | movgteu r20,r17 | |
77 | sub r16,r16,1 | |
78 | jr r12 | |
79 | .rep 30 | |
80 | lsl r2,r2,1 | |
81 | sub r3,r2,r16 | |
82 | movgteu r2,r3 | |
83 | .endr | |
84 | sub r0,r0,1 ; mask result bits from steps ... | |
85 | and r0,r0,r2 | |
86 | orr r20,r0,r20 ; ... and combine with first bit. | |
87 | .L0step:eor r0,r20,r19 ; restore sign | |
88 | sub r0,r0,r19 | |
89 | rts | |
90 | .Lret0: mov r0,0 | |
91 | rts | |
92 | ENDFUNC(__divsi3) |