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pt3: optimization notes
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Vince Weaver
parent
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commit
c2482b41b6
@ -7,15 +7,18 @@ Code Optimization
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I'm keeping some stats here as I try to optimize the size and speed.
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Song: "Summer of Rain"
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~~~~~~~~~~~~~~~~~~~~~~
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Song: "Summer of Rain" SR.PT3
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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lz4 compressed
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pt3 size: raw size: ym5 size: pt3.lz4:
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3871 137015 7637 1793
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Size=pt3lib_end - note_a = 1787 - A38
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Decoder Type size ZP use decode total CPU overhead
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-------------------------------------------------------------
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Original 4k(?) 22B 28.16s 171s 16%
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Original 3407 22B 31s 171s 18%
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@ -26,7 +29,7 @@ Code Optimization
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Times:
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Times: Validated
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BH.PT3: 10.0B 16 1:33 93 17.2%
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CH.PT3: 1D.12 29 2:49 169 17.2%
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CR.PT3: 0F.25 15 1:30 90 16.7%
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@ -246,58 +246,75 @@ freq_h: .byte $00
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; ornament value in A
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; note offset in X
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; Ornament table pointers are 16-bits little endian
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; There are 16 of these pointers starting at $aa:$a9
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; Our ornament starts at address (A*2)+that pointer
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; We point ORNAMENT_H:ORNAMENT_L to this
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; then we load the length/data values
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; and then leave ORNAMENT_H:ORNAMENT_L pointing to begnning of
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; the ornament data
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; Optimization:
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; Loop and length only used once, can be located negative
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; from the pointer, but 6502 doesn't make addressing like that
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; easy. Can't self modify as channels A/B/C have own copies
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; of the var.
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load_ornament:
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sty ysave
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; save as new ornament
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; sta note_a+NOTE_ORNAMENT,X ; do we use this?
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sty ysave ; save Y value ; 3
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;pt3->ornament_patterns[i]=
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; (pt3->data[0xaa+(i*2)]<<8)|pt3->data[0xa9+(i*2)];
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clc
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asl ; A*2
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adc #$a9
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tay
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clc ; 2
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asl ; A*2 ; 2
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adc #PT3_ORNAMENT_LOC_L ; 2
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tay ; 2
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; a->ornament_pointer=pt3->ornament_patterns[a->ornament];
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lda PT3_LOC,Y
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sta ORNAMENT_L
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lda PT3_LOC,Y ; 4+
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sta ORNAMENT_L ; 3
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iny
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lda PT3_LOC,Y
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clc
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adc #>PT3_LOC
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sta ORNAMENT_H
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iny ; 2
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lda PT3_LOC,Y ; 4+
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clc ; 2
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ldy #0
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; we're assuming PT3 is loaded to a page boundary
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adc #>PT3_LOC ; 2
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sta ORNAMENT_H ; 3
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ldy #0 ; 2
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; Set the loop value
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; a->ornament_loop=pt3->data[a->ornament_pointer];
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lda (ORNAMENT_L),Y
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sta note_a+NOTE_ORNAMENT_LOOP,X
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lda (ORNAMENT_L),Y ; 5+
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sta note_a+NOTE_ORNAMENT_LOOP,X ; 5
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; Set the length value
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; a->ornament_length=pt3->data[a->ornament_pointer];
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iny
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lda (ORNAMENT_L),Y
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sta note_a+NOTE_ORNAMENT_LENGTH,X
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iny ; 2
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lda (ORNAMENT_L),Y ; 5+
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sta note_a+NOTE_ORNAMENT_LENGTH,X ; 5
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; Set the pointer to the value past the length
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clc
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lda ORNAMENT_L
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adc #$2
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sta note_a+NOTE_ORNAMENT_POINTER_L,X
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lda ORNAMENT_H
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adc #$0
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sta note_a+NOTE_ORNAMENT_POINTER_H,X
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clc ; 2
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lda ORNAMENT_L ; 3
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adc #$2 ; 2
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sta note_a+NOTE_ORNAMENT_POINTER_L,X ; 5
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lda ORNAMENT_H ; 3
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adc #$0 ; 2
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sta note_a+NOTE_ORNAMENT_POINTER_H,X ; 5
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ldy ysave
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ldy ysave ; restore Y value ; 3
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rts
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rts ; 6
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;============
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; 86
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;===========================
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; Load Sample
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@ -305,58 +322,72 @@ load_ornament:
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; sample in A
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; which note offset in X
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; Sample table pointers are 16-bits little endian
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; There are 32 of these pointers starting at $6a:$69
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; Our sample starts at address (A*2)+that pointer
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; We point SAMPLE_H:SAMPLE_L to this
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; then we load the length/data values
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; and then leave SAMPLE_H:SAMPLE_L pointing to begnning of
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; the sample data
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; Optimization:
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; see comments on ornament setting
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load_sample:
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sty ysave
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sty ysave ; 3
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;pt3->ornament_patterns[i]=
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; (pt3->data[0x6a+(i*2)]<<8)|pt3->data[0x69+(i*2)];
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clc
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asl ; A*2
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adc #$69
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tay
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clc ; 2
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asl ; A*2 ; 2
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adc #SAMPLE_LOC_L ; 2
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tay ; 2
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; Set the initial sample pointer
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; a->sample_pointer=pt3->sample_patterns[a->sample];
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lda PT3_LOC,Y
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sta SAMPLE_L
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lda PT3_LOC,Y ; 4+
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sta SAMPLE_L ; 3
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iny
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lda PT3_LOC,Y
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clc
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adc #>PT3_LOC
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sta SAMPLE_H
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iny ; 2
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lda PT3_LOC,Y ; 4+
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clc ; 2
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; assume pt3 file is at page boundary
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adc #>PT3_LOC ; 2
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sta SAMPLE_H ; 3
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; Set the loop value
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; a->sample_loop=pt3->data[a->sample_pointer];
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ldy #0
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lda (SAMPLE_L),Y
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sta note_a+NOTE_SAMPLE_LOOP,X
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ldy #0 ; 2
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lda (SAMPLE_L),Y ; 5+
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sta note_a+NOTE_SAMPLE_LOOP,X ; 5
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; Set the length value
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; a->sample_length=pt3->data[a->sample_pointer];
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iny
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lda (SAMPLE_L),Y
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sta note_a+NOTE_SAMPLE_LENGTH,X
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iny ; 2
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lda (SAMPLE_L),Y ; 5+
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sta note_a+NOTE_SAMPLE_LENGTH,X ; 5
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; Set pointer to beginning of samples
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clc
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lda SAMPLE_L
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adc #$2
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sta note_a+NOTE_SAMPLE_POINTER_L,X
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lda SAMPLE_H
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adc #$0
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sta note_a+NOTE_SAMPLE_POINTER_H,X
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clc ; 2
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lda SAMPLE_L ; 3
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adc #$2 ; 2
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sta note_a+NOTE_SAMPLE_POINTER_L,X ; 5
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lda SAMPLE_H ; 3
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adc #$0 ; 2
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sta note_a+NOTE_SAMPLE_POINTER_H,X ; 5
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ldy ysave
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rts
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ldy ysave ; 3
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rts ; 6
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;============
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; 86
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;====================================
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; pt3_init_song
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@ -2206,3 +2237,4 @@ PT3VolumeTable_35:
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.byte $0,$1,$2,$3,$4,$5,$6,$7,$8,$9,$A,$B,$C,$D,$E,$F
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pt3_lib_end:
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