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optimized __idvrmu branching #746

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optimized __idvrmu branching #746

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13 changes: 7 additions & 6 deletions src/crt/idvrmu.src
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Original file line number Diff line number Diff line change
Expand Up @@ -24,23 +24,24 @@ __idvrmu.hijack_a_iters_ude_dividend:

or a, a
sbc hl, hl

; jr .L.loop
db $DA ; jp c, *
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@ZERICO2005 ZERICO2005 Mar 12, 2026

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We can make this 1F faster at the cost of 1 byte by using jr .L.loop instead of jp c, *

.L.restore_skip:
inc de ; DE |= 1
jr z, .L.finish
.L.loop:
ex de, hl
add hl, hl
ex de, hl
adc hl, hl

sbc hl, bc
inc e

dec a
jr nc, .L.restore_skip
add hl, bc
dec e
.L.restore_skip:

dec a
jr nz, .L.loop
.L.finish:

pop af
ret
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