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| 1 : | canard | 1.2 | # Copyright (C) 2002 Guillaume Morin <guillaume@morinfr.org>, Alcôve |
| 2 : | canard | 1.1 | # |
| 3 : | edgomez | 1.11 | # This program is free software; you can redistribute it and/or modify |
| 4 : | # it under the terms of the GNU General Public License as published by | ||
| 5 : | # the Free Software Foundation; either version 2 of the License, or | ||
| 6 : | # (at your option) any later version. | ||
| 7 : | # | ||
| 8 : | # This program is distributed in the hope that it will be useful, | ||
| 9 : | # but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 10 : | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| 11 : | # GNU General Public License for more details. | ||
| 12 : | # | ||
| 13 : | # You should have received a copy of the GNU General Public License | ||
| 14 : | # along with this program; if not, write to the Free Software | ||
| 15 : | # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
| 16 : | # | ||
| 17 : | canard | 1.1 | # |
| 18 : | edgomez | 1.13 | # $Id: cbp_ppc.s,v 1.12 2004/03/22 22:36:23 edgomez Exp $ |
| 19 : | # $Source: /xvid/xvidcore/src/bitstream/ppc_asm/cbp_ppc.s,v $ | ||
| 20 : | # $Date: 2004/03/22 22:36:23 $ | ||
| 21 : | # $Author: edgomez $ | ||
| 22 : | canard | 1.2 | # |
| 23 : | canard | 1.5 | # This is my first PPC ASM attempt. So I might do nasty things. |
| 24 : | # Please send any comments to <guillaume@morinfr.org> | ||
| 25 : | canard | 1.2 | |
| 26 : | canard | 1.1 | |
| 27 : | canard | 1.2 | # Returns a field of bits that indicates non zero ac blocks |
| 28 : | # for this macro block | ||
| 29 : | # | ||
| 30 : | # uint32_t calc_cbp_c(const int16_t codes[6][64]) | ||
| 31 : | canard | 1.1 | #{ |
| 32 : | canard | 1.2 | # uint32_t i, j; |
| 33 : | # uint32_t cbp = 0; | ||
| 34 : | canard | 1.1 | # |
| 35 : | canard | 1.2 | # for (i = 0; i < 6; i++) { |
| 36 : | # for (j = 1; j < 61; j+=4) { | ||
| 37 : | canard | 1.1 | # if (codes[i][j] |codes[i][j+1]| |
| 38 : | canard | 1.2 | # codes[i][j+2]|codes[i][j+3]) { |
| 39 : | canard | 1.1 | # cbp |= 1 << (5 - i); |
| 40 : | # break; | ||
| 41 : | # } | ||
| 42 : | # } | ||
| 43 : | canard | 1.2 | # |
| 44 : | # if(codes[i][j]|codes[i][j+1]|codes[i][j+2]) | ||
| 45 : | # cbp |= 1 << (5 - i); | ||
| 46 : | # | ||
| 47 : | # } | ||
| 48 : | # | ||
| 49 : | # return cbp; | ||
| 50 : | # | ||
| 51 : | canard | 1.1 | #} |
| 52 : | |||
| 53 : | canard | 1.8 | .data |
| 54 : | .skip: | ||
| 55 : | .word 0,-1 | ||
| 56 : | .align 4 | ||
| 57 : | |||
| 58 : | canard | 1.1 | .text |
| 59 : | .global calc_cbp_ppc | ||
| 60 : | calc_cbp_ppc: | ||
| 61 : | canard | 1.2 | # r9 will contain coeffs addr |
| 62 : | canard | 1.9 | mr %r9,%r3 |
| 63 : | canard | 1.4 | # r8 is the loop counter (rows) |
| 64 : | canard | 1.9 | li %r8,5 |
| 65 : | canard | 1.2 | # r3 contains the result, therefore we set it to 0 |
| 66 : | canard | 1.9 | li %r3,0 |
| 67 : | canard | 1.1 | .loop: |
| 68 : | canard | 1.5 | # CTR is the loop2 counter |
| 69 : | canard | 1.9 | li %r4,16 |
| 70 : | mtctr %r4 | ||
| 71 : | canard | 1.2 | # r6 is coeff pointer for this line |
| 72 : | canard | 1.9 | mr %r6,%r9 |
| 73 : | lis %r7,.skip@ha | ||
| 74 : | addi %r7,%r7,.skip@l | ||
| 75 : | lwz %r7,0(%r7) | ||
| 76 : | canard | 1.1 | .loop2: |
| 77 : | canard | 1.2 | # coeffs is a matrix of 16 bits cells |
| 78 : | canard | 1.9 | lwz %r4,0(%r6) |
| 79 : | and %r4,%r4,%r7 | ||
| 80 : | li %r7,-1 | ||
| 81 : | canard | 1.8 | |
| 82 : | canard | 1.9 | lwz %r5,4(%r6) |
| 83 : | canard | 1.2 | # or. updates CR0 |
| 84 : | canard | 1.9 | or. %r4,%r5,%r4 |
| 85 : | canard | 1.2 | # testing bit 2 (is zero) of CR0 |
| 86 : | canard | 1.3 | bf 2,.cbp |
| 87 : | canard | 1.9 | addi %r6,%r6,8 |
| 88 : | canard | 1.5 | bdnz .loop2 |
| 89 : | canard | 1.8 | b .newline |
| 90 : | canard | 1.1 | .cbp: |
| 91 : | canard | 1.9 | li %r4,1 |
| 92 : | slw %r4,%r4,%r8 | ||
| 93 : | or %r3,%r3,%r4 | ||
| 94 : | canard | 1.1 | .newline: |
| 95 : | canard | 1.9 | addi %r9,%r9,128 |
| 96 : | canard | 1.2 | # updates CR0, blabla |
| 97 : | canard | 1.9 | subic. %r8,%r8,1 |
| 98 : | canard | 1.3 | bf 0,.loop |
| 99 : | canard | 1.1 | blr |
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