[cvs] / xvidcore / src / bitstream / ppc_asm / cbp_ppc.s Repository:
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revision 1.3, Fri Mar 22 11:32:47 2002 UTC revision 1.6, Fri Mar 22 13:05:45 2002 UTC
# Line 20  Line 20 
20  #    $Date$  #    $Date$
21  #    $Author$  #    $Author$
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 4,15
65            mtctr 4
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 77  Line 78 
78          # testing bit 2 (is zero) of CR0          # testing bit 2 (is zero) of CR0
79          bf 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  
         bt 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 95  Line 92 
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          bf 0,.loop          bf 0,.loop
 .end:  
100          blr          blr
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