[cvs] / xvidcore / src / bitstream / ppc_asm / cbp_ppc.s Repository:
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revision 1.4, Fri Mar 22 12:24:07 2002 UTC revision 1.7, Fri Mar 22 13:39:01 2002 UTC
# Line 20  Line 20 
20  #    $Date$  #    $Date$
21  #    $Author$  #    $Author$
22  #  #
23  #    This is the PPC ASM code I write. 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 60  Line 60 
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 (columns), 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:
69          # coeffs is a matrix of 16 bits cells          # coeffs is a matrix of 16 bits cells
70          lha 4,2(6)          lwz 4,2(6)
71          lha 5,4(6)          lwz 5,6(6)
         or 4,5,4  
         lha 5,6(6)  
         or 4,5,4  
         lha 5,8(6)  
72          # or. updates CR0          # or. updates CR0
73          or. 4,5,4          or. 4,5,4
74          # testing bit 2 (is zero) of CR0          # testing bit 2 (is zero) of CR0
75          bf 2,.cbp          bf 2,.cbp
76          addi 6,6,8          addi 6,6,8
77          # subic. updates CR0          bdnz .loop2
78          subic. 7,7,1          # latest line coeffs
79          # testing bit 0 (is negative) of CR0          lwz 4,2(6)
80          bt 0,.lastcoeffs          lhz 5,6(6)
         b .loop2  
 .lastcoeffs:  
         lha 4,2(6)  
         lha 5,4(6)  
         or 4,5,4  
         lha 5,6(6)  
81          # or. updates CR0          # or. updates CR0
82          or. 4,5,4          or. 4,5,4
83          # testing bit 2 (is zero) of CR0          # testing bit 2 (is zero) of CR0
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