brooke/mandel-6502
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compare: brooke:57975b7158c8dae6ee2d10519a4bca36f3b6dac1
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brooke:fastmul
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mandel.s
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@ -397,7 +397,7 @@ neg2:
positive: positive:
inc arg + 2 ; 5 cyc inc arg + 2 ; 5 cyc
bne next ; 2 cyc beq next ; 2 cyc
inc arg + 3 ; 5 cyc inc arg + 3 ; 5 cyc
zero: zero:
@ -436,16 +436,11 @@ keep_going:
.macro quick_exit arg .macro quick_exit arg
.local keep_going .local keep_going
.local keep_going2
lda arg + 1 lda arg + 1
cmp #(4 << 4) cmp #(4 << 4)
bmi keep_going bmi keep_going
rts rts
keep_going: keep_going:
cmp #(256 - (4 << 4))
bpl keep_going2
rts
keep_going2:
.endmacro .endmacro
; 4.12: (-8 .. +7.9) ; 4.12: (-8 .. +7.9)
@ -457,19 +452,18 @@ keep_going:
; zy = zx_zy + zx_zy + cy ; zy = zx_zy + zx_zy + cy
add16 zy, zx_zy, zx_zy add16 zy, zx_zy, zx_zy
add16 zy, zy, cy add16 zy, zy, cy
quick_exit zy
; zx_2 = zx * zx ; zx_2 = zx * zx
imul16_round zx_2, zx, zx, 4 imul16_round zx_2, zx, zx, 4
quick_exit zx_2 quick_exit dist
; zy_2 = zy * zy ; zy_2 = zy * zy
imul16_round zy_2, zy, zy, 4 imul16_round zy_2, zy, zy, 4
quick_exit zy_2 quick_exit dist
; zx_zy = zx * zy ; zx_zy = zx * zy
imul16_round zx_zy, zx, zy, 4 imul16_round zx_zy, zx, zy, 4
quick_exit zx_zy quick_exit dist
; dist = zx_2 + zy_2 ; dist = zx_2 + zy_2
add16 dist, zx_2, zy_2 add16 dist, zx_2, zy_2