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LANGUAGE OS.iso
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dr.bub
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96000.lha
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96000
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appb
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b140b.asm
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Assembly Source File
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1992-04-28
|
3KB
|
50 lines
; This program was originally published in the Motorola DSP96002 Users Manual
; and is provided under a DISCLAIMER OF WARRANTY available from Motorola DSP
; Operation, 6501 William Cannon Drive West, Austin, Texas 78735-8598. For
; more information, refer to the DSP96002 Users Manual, Appendix B, DSP
; Benchmarks.
;
; B.1.40.2 64 Bit Block Transfer
;A more efficient implementation of BITBLT may be performed by transferring 64 bits at a time. Thus,
;the value of COUNT specifies the number of 64 bit transfers (two 32 bit words).
; 64 Bit Block Transfer Program ICycles
; BITBLT Words
org x:0
source ds 1 ;source address
dest ds 1 ;destination address
offset ds 1 ;bit number start (0-31)
count ds 1 ;number of 64 bit source words
org p:$50
move x:offset,d0.l ;get output bit position 2 2
move x:offset,d0.l ;get output bit position 2 2
move #32,d1.l ;get 32 2 2
sub d0,d1 x:source,r0 ;32-offset, get source address 2 2
move x:dest,r1 ;point to destination address 2 2
move d1.l,d1.h ;move shift factor 1 1
lsl d1,d4 d0.l,d0.h ;shift bits, move shift factor 1 1
move x:count,n0 ;get source word count 2 2
move (r1)- ;backup pointer 1 1
move y:(r1)+,d6.l ;init pipe 1 1
move y:(r1)-,d4.l ;get first bits of dest 1 1
move y:(r0)+,d5.l ;get source bits 1 1
do n0,bitblt ;do transfer 2 3
lsr d1,d4 d6.l,y:(r1)+ 1 1
lsl d0,d5 d5.l,d3.l 1 1
or d4,d5 y:(r0)+,d6.l 1 1
lsr d1,d3 d5.l,y:(r1)+ 1 1
lsl d0,d6 d6.l,d4.l 1 1
or d3,d6 y:(r0)+,d5.l 1 1
bitblt
move d6.l,y:(r1)+ 1 1
lsr d1,d4 y:(r1),d5.l ;shift old bits, get dest bits 1 1
lsr d0,d5 ;shift dest bits 1 1
lsl d0,d5 ;shift dest bits back 1 1
or d4,d5 ;part of dest with source bits 1 1
move d5.l,y:(r1) ;save new destination bits 1 1
; --- ---
; Totals: 32 6N+27
;Where N represents 64 bits transferred. At a 13.5 MIPS, a total of (13.5/6)*64 = 144
;MBits/Second transfer rate is possible.