| 15 |
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 16 |
# |
# |
| 17 |
# |
# |
| 18 |
# $Id: cbp_ppc.s,v 1.8 2002-03-27 15:06:14 canard Exp $ |
# $Id: cbp_ppc.s,v 1.9 2002-03-28 12:29:58 canard Exp $ |
| 19 |
# $Source: /home/xvid/cvs_copy/cvs-server-root/xvid/xvidcore/src/bitstream/ppc_asm/cbp_ppc.s,v $ |
# $Source: /home/xvid/cvs_copy/cvs-server-root/xvid/xvidcore/src/bitstream/ppc_asm/cbp_ppc.s,v $ |
| 20 |
# $Date: 2002-03-27 15:06:14 $ |
# $Date: 2002-03-28 12:29:58 $ |
| 21 |
# $Author: canard $ |
# $Author: canard $ |
| 22 |
# |
# |
| 23 |
# This is my first PPC ASM attempt. So I might do nasty things. |
# This is my first PPC ASM attempt. So I might do nasty things. |
| 59 |
.global calc_cbp_ppc |
.global calc_cbp_ppc |
| 60 |
calc_cbp_ppc: |
calc_cbp_ppc: |
| 61 |
# r9 will contain coeffs addr |
# r9 will contain coeffs addr |
| 62 |
mr 9,3 |
mr %r9,%r3 |
| 63 |
# r8 is the loop counter (rows) |
# r8 is the loop counter (rows) |
| 64 |
li 8,5 |
li %r8,5 |
| 65 |
# r3 contains the result, therefore we set it to 0 |
# r3 contains the result, therefore we set it to 0 |
| 66 |
li 3,0 |
li %r3,0 |
| 67 |
.loop: |
.loop: |
| 68 |
# CTR is the loop2 counter |
# CTR is the loop2 counter |
| 69 |
li 4,16 |
li %r4,16 |
| 70 |
mtctr 4 |
mtctr %r4 |
| 71 |
# r6 is coeff pointer for this line |
# r6 is coeff pointer for this line |
| 72 |
mr 6,9 |
mr %r6,%r9 |
| 73 |
lis 7,.skip@ha |
lis %r7,.skip@ha |
| 74 |
addi 7,7,.skip@l |
addi %r7,%r7,.skip@l |
| 75 |
lwz 7,0(7) |
lwz %r7,0(%r7) |
| 76 |
.loop2: |
.loop2: |
| 77 |
# coeffs is a matrix of 16 bits cells |
# coeffs is a matrix of 16 bits cells |
| 78 |
lwz 4,0(6) |
lwz %r4,0(%r6) |
| 79 |
and 4,4,7 |
and %r4,%r4,%r7 |
| 80 |
li 7,-1 |
li %r7,-1 |
| 81 |
|
|
| 82 |
lwz 5,4(6) |
lwz %r5,4(%r6) |
| 83 |
# or. updates CR0 |
# or. updates CR0 |
| 84 |
or. 4,5,4 |
or. %r4,%r5,%r4 |
| 85 |
# testing bit 2 (is zero) of CR0 |
# testing bit 2 (is zero) of CR0 |
| 86 |
bf 2,.cbp |
bf 2,.cbp |
| 87 |
addi 6,6,8 |
addi %r6,%r6,8 |
| 88 |
bdnz .loop2 |
bdnz .loop2 |
| 89 |
b .newline |
b .newline |
| 90 |
.cbp: |
.cbp: |
| 91 |
li 4,1 |
li %r4,1 |
| 92 |
slw 4,4,8 |
slw %r4,%r4,%r8 |
| 93 |
or 3,3,4 |
or %r3,%r3,%r4 |
| 94 |
.newline: |
.newline: |
| 95 |
addi 9,9,128 |
addi %r9,%r9,128 |
| 96 |
# updates CR0, blabla |
# updates CR0, blabla |
| 97 |
subic. 8,8,1 |
subic. %r8,%r8,1 |
| 98 |
bf 0,.loop |
bf 0,.loop |
| 99 |
blr |
blr |
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