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Reworked one use of addHL

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By essentially inlining both addHL and cpHLDE, 100 cycles are saved, but due to the registers not needing preserving, a byte is saved too.
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Clanmaster21 2019-10-17 07:26:22 +01:00 committed by GitHub
parent e1c7269809
commit 9803b458f6
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1 changed files with 5 additions and 3 deletions
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apps/zasm/symbol.asm
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@ -110,12 +110,14 @@ symRegister:
; Is our new name going to make us go out of bounds? ; Is our new name going to make us go out of bounds?
push hl ; --> lvl 2 push hl ; --> lvl 2
push de ; --> lvl 3 push de ; --> lvl 3
ld d, 0
ld e, c
add hl, de ; if carry set here, sbc will carry too
ld e, (ix+2) ; DE --> pointer to record list, which is also ld e, (ix+2) ; DE --> pointer to record list, which is also
ld d, (ix+3) ; the end of names pool ld d, (ix+3) ; the end of names pool
; DE --> names end ; DE --> names end
ld a, c
call addHL sbc hl, de ; compares hl and de destructively
call cpHLDE
pop de ; <-- lvl 3 pop de ; <-- lvl 3
pop hl ; <-- lvl 2 pop hl ; <-- lvl 2
jr nc, .outOfMemory ; HL >= DE jr nc, .outOfMemory ; HL >= DE