projects / thirdparty / gcc.git / blame
| Commit | Line | Data |
|---|---|---|
| feeeff5c | 1 | /* Unsigned 32 bit division 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 (__udivsi3,T_UINT) | |
| 29 | .global SYM(__udivsi3) | |
| 30 | .balign 4 | |
| 31 | HIDDEN_FUNC(__udivsi3) | |
| 32 | SYM(__udivsi3): | |
| 33 | sub r3,r0,r1 | |
| 34 | bltu .Lret0 | |
| 35 | mov r3,0x95 | |
| 36 | lsl r12,r3,23 ; 0x4a800000 | |
| 37 | lsl r3,r3,30 ; 0x40000000 | |
| 38 | orr r16,r0,r3 | |
| 39 | orr r2,r1,r3 | |
| 40 | fsub r16,r16,r3 | |
| 41 | fsub r2,r2,r3 | |
| 42 | lsr r3,r1,21 | |
| 43 | lsr r17,r0,21 | |
| 44 | movt r17,0x4a80 | |
| 45 | fsub r17,r17,r12 | |
| 46 | movt r3,0x4a80 | |
| 47 | fsub r3,r3,r12 | |
| 48 | mov r12,%low(.L0step) | |
| 49 | movt r12,%high(.L0step) | |
| 50 | mov r21,1 | |
| 51 | movne r16,r17 | |
| 52 | lsr r17,r1,21 | |
| 53 | movne r2,r3 | |
| 54 | lsr r3,r16,23 ; must mask lower bits of r2 in case op0 was .. | |
| 55 | lsr r2,r2,23 ; .. shifted and op1 was not. | |
| 56 | sub r3,r3,r2 ; calculate bit number difference. | |
| 57 | lsl r1,r1,r3 | |
| 58 | lsr r16,r1,1 | |
| 59 | lsl r2,r21,r3 | |
| 60 | lsl r3,r3,3 | |
| 61 | sub r12,r12,r3 | |
| 62 | sub r3,r0,r1 | |
| 63 | movltu r3,r0 | |
| 64 | mov r0,0 | |
| 65 | movgteu r0,r2 | |
| 66 | lsr r2,r2,1 | |
| 67 | add r17,r2,r0 | |
| 68 | sub r1,r3,r16 | |
| 69 | movgteu r3,r1 | |
| 70 | movgteu r0,r17 | |
| 71 | sub r16,r16,1 | |
| 72 | jr r12 | |
| 73 | .rep 30 | |
| 74 | lsl r3,r3,1 | |
| 75 | sub r1,r3,r16 | |
| 76 | movgteu r3,r1 | |
| 77 | .endr | |
| 78 | sub r2,r2,1 ; mask result bits from steps ... | |
| 79 | and r3,r3,r2 | |
| 80 | orr r0,r0,r3 ; ... and combine with first bits. | |
| 81 | nop | |
| 82 | .L0step:rts | |
| 83 | .Lret0: mov r0,0 | |
| 84 | rts | |
| 85 | ENDFUNC(__udivsi3) |