[svn] / trunk / xvidcore / src / bitstream / ppc_asm / cbp_ppc.s Repository:
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revision 54, Fri Mar 22 11:29:20 2002 UTC revision 57, Fri Mar 22 12:51:22 2002 UTC
# Line 15  Line 15 
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 1.2 2002-03-22 11:29:20 canard Exp $  #    $Id: cbp_ppc.s,v 1.5 2002-03-22 12:51:22 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: 2002-03-22 11:29:20 $  #    $Date: 2002-03-22 12:51:22 $
21  #    $Author: canard $  #    $Author: canard $
22  #  #
23  #    This is my first PPC ASM program. So I might do nasty things.  #    This is my first PPC ASM attempt. So I might do nasty things.
24  #    Please send any comments to guillaume@morinfr.org  #    Please send any comments to <guillaume@morinfr.org>
25    
26    
27  # Returns a field of bits that indicates non zero ac blocks  # Returns a field of bits that indicates non zero ac blocks
# Line 55  Line 55 
55  calc_cbp_ppc:  calc_cbp_ppc:
56          # r9 will contain coeffs addr          # r9 will contain coeffs addr
57          mr 9,3          mr 9,3
58          # r8 is the loop counter          # r8 is the loop counter (rows)
59          li 8,5          li 8,5
60          # r3 contains the result, therefore we set it to 0          # r3 contains the result, therefore we set it to 0
61          xor 3,3,3          xor 3,3,3
62  .loop:  .loop:
63          # r7 is the loop2 counter, FIXME: use CTR          # CTR is the loop2 counter
64          li 7,14          li 7,15
65            mtspr 9,7
66          # r6 is coeff pointer for this line          # r6 is coeff pointer for this line
67          mr 6,9          mr 6,9
68  .loop2:  .loop2:
# Line 75  Line 76 
76          # or. updates CR0          # or. updates CR0
77          or. 4,5,4          or. 4,5,4
78          # testing bit 2 (is zero) of CR0          # testing bit 2 (is zero) of CR0
79          bc 4,2,.cbp          bf 2,.cbp
80          addi 6,6,8          addi 6,6,8
81          # subic. updates CR0          bdnz .loop2
82          subic. 7,7,1          # latest line coeffs
         # testing bit 0 (is negative) of CR0  
         bc 12,0,.lastcoeffs  
         b .loop2  
 .lastcoeffs:  
83          lha 4,2(6)          lha 4,2(6)
84          lha 5,4(6)          lha 5,4(6)
85          or 4,5,4          or 4,5,4
# Line 90  Line 87 
87          # or. updates CR0          # or. updates CR0
88          or. 4,5,4          or. 4,5,4
89          # testing bit 2 (is zero) of CR0          # testing bit 2 (is zero) of CR0
90          bc 12,2,.newline          bt 2,.newline
91  .cbp:  .cbp:
92          li 4,1          li 4,1
93          slw 4,4,8          slw 4,4,8
94          or 3,3,4          or 3,3,4
         b .newline  
95  .newline:  .newline:
96          addi 9,9,128          addi 9,9,128
97          # updates CR0, blabla          # updates CR0, blabla
98          subic. 8,8,1          subic. 8,8,1
99          bc 4,0,.loop          bf 0,.loop
 .end:  
100          blr          blr
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