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Update core.asm

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Clanmaster21 2019-10-10 19:26:03 +01:00 committed by GitHub
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commit f01ef676b0
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1 changed files with 14 additions and 14 deletions
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kernel/core.asm
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@ -29,26 +29,26 @@ noop: ; piggy backing on the first "ret" we have
; copy (HL) into DE, then exchange the two, utilising the optimised HL instructions. ; copy (HL) into DE, then exchange the two, utilising the optimised HL instructions.
; ld must be done little endian, so least significant byte first. ; ld must be done little endian, so least significant byte first.
intoHL: intoHL:
push de push de
ld e, (hl) ld e, (hl)
inc hl inc hl
ld d, (hl) ld d, (hl)
ex de, hl ex de, hl
pop de pop de
ret ret
intoDE: intoDE:
ex de, hl ex de, hl
call intoHL call intoHL
ex de, hl ; de preserved by intoHL, so no push/pop needed ex de, hl ; de preserved by intoHL, so no push/pop needed
ret ret
intoIX: intoIX:
push ix push ix
ex (sp), hl ;swap hl with ix, on the stack ex (sp), hl ;swap hl with ix, on the stack
call intoHL call intoHL
ex (sp), hl ;restore hl from stack ex (sp), hl ;restore hl from stack
pop ix pop ix
ret ret
; add the value of A into HL ; add the value of A into HL