projects / thirdparty / gcc.git / blame
| Commit | Line | Data |
|---|---|---|
| 74b9f2d5 | 1 | /* Support file for -mfix-vr4120. |
| a5544970 | 2 | Copyright (C) 2002-2019 Free Software Foundation, Inc. |
| c235ddf2 DD |
3 | |
| 4 | This file is part of GCC. | |
| 5 | ||
| 46549c20 MK |
6 | GCC is free software; you can redistribute it and/or modify it under |
| 7 | the terms of the GNU General Public License as published by the Free | |
| 8 | Software Foundation; either version 3, or (at your option) any later | |
| 9 | version. | |
| 10 | ||
| 11 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
| 12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | for more details. | |
| 15 | ||
| 16 | Under Section 7 of GPL version 3, you are granted additional | |
| 17 | permissions described in the GCC Runtime Library Exception, version | |
| 18 | 3.1, as published by the Free Software Foundation. | |
| 19 | ||
| 20 | You should have received a copy of the GNU General Public License and | |
| 21 | a copy of the GCC Runtime Library Exception along with this program; | |
| 22 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
| 2f83c7d6 | 23 | <http://www.gnu.org/licenses/>. */ |
| c235ddf2 DD |
24 | |
| 25 | /* This file contains functions which implement divsi3 and modsi3 for | |
| 74b9f2d5 RS |
26 | -mfix-vr4120. div and ddiv do not give the correct result when one |
| 27 | of the operands is negative. */ | |
| c235ddf2 DD |
28 | |
| 29 | .set nomips16 | |
| 30 | ||
| 31 | #define DIV \ | |
| 32 | xor $3,$4,$5 /* t = x ^ y */ ; \ | |
| 33 | li $2,0x80000000; \ | |
| 34 | .set noreorder; \ | |
| 35 | bgez $4,1f /* x >= 0 */; \ | |
| 36 | and $3,$3,$2 /* t = (x ^ y) & 0x80000000 in delay slot */ ;\ | |
| 37 | .set reorder; \ | |
| 38 | subu $4,$0,$4 /* x = -x */ ; \ | |
| 39 | 1:; \ | |
| 40 | .set noreorder; \ | |
| 41 | bgez $5,2f /* y >= 0 */ ; \ | |
| 42 | nop; \ | |
| 43 | subu $5,$0,$5 /* y = -y */ ; \ | |
| 44 | .set reorder; \ | |
| 45 | 2:; \ | |
| 46 | divu $0,$4,$5; /* we use divu because of INT_MIN */ \ | |
| 47 | .set noreorder; \ | |
| 48 | bne $5,$0,3f; \ | |
| 49 | nop; \ | |
| 50 | break 7 /* division on zero y */ ; \ | |
| 51 | 3:; \ | |
| 52 | .set reorder; \ | |
| 53 | mflo $2 /* r = x / y */ ; \ | |
| 54 | .set noreorder; \ | |
| 55 | beq $3,$0,4f /* t == 0 */ ; \ | |
| 56 | nop; \ | |
| 57 | subu $2,$0,$2 /* r = -r */ ; \ | |
| 58 | .set reorder; \ | |
| 59 | 4: | |
| 60 | ||
| 74b9f2d5 RS |
61 | .globl __vr4120_divsi3 |
| 62 | .ent __vr4120_divsi3 | |
| 63 | __vr4120_divsi3: | |
| c235ddf2 DD |
64 | DIV |
| 65 | j $31 | |
| 74b9f2d5 | 66 | .end __vr4120_divsi3 |
| c235ddf2 | 67 | |
| 74b9f2d5 RS |
68 | .globl __vr4120_modsi3 |
| 69 | .ent __vr4120_modsi3 | |
| 70 | __vr4120_modsi3: | |
| c235ddf2 DD |
71 | move $6,$4 # x1 = x |
| 72 | move $7,$5 # y1 = y | |
| 73 | DIV | |
| 74 | mult $2,$7 # r = r * y1 | |
| 75 | mflo $2 | |
| 76 | .set noreorder | |
| 77 | j $31 | |
| 78 | subu $2,$6,$2 # r = x1 - r in delay slot | |
| 74b9f2d5 | 79 | .end __vr4120_modsi3 |