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unify tables for squaring and multiplication

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This commit is contained in:
Jamey Sharp 2024-12-31 02:26:24 -08:00
parent f06aed0c00
commit 0f49760aa5
2 changed files with 6 additions and 15 deletions
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10
mandel.s
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@ -131,8 +131,6 @@ KEY_0 = 50
.import mul_lobyte .import mul_lobyte
.import mul_hibyte .import mul_hibyte
.import sqr_lobyte
.import sqr_hibyte
.data .data
@ -444,9 +442,13 @@ viewport_oy:
; clobbers a, x ; clobbers a, x
.macro sqr8 dest, arg .macro sqr8 dest, arg
ldx arg ldx arg
lda sqr_lobyte,x txa
lsr
lda mul_lobyte,x
rol
sta dest sta dest
lda sqr_hibyte,x lda mul_hibyte,x
rol
sta dest + 1 sta dest + 1
.endmacro .endmacro

11
tables.js
View file

@ -16,8 +16,6 @@ console.log(
.export mul_lobyte .export mul_lobyte
.export mul_hibyte .export mul_hibyte
.export sqr_lobyte
.export sqr_hibyte
; (i * i) / 2 for the multiplier ; (i * i) / 2 for the multiplier
.align 256 .align 256
@ -28,13 +26,4 @@ ${db((i) => ((i * i) >> 1) & 0xff)}
mul_hibyte: mul_hibyte:
${db((i) => ((i * i) >> 9) & 0xff)} ${db((i) => ((i * i) >> 9) & 0xff)}
; (i * i) for the plain squares
.align 256
sqr_lobyte:
${db((i) => (i * i) & 0xff)}
.align 256
sqr_hibyte:
${db((i) => ((i * i) >> 8) & 0xff)}
`); `);