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Optimize HexToDec and hopefully not break anything. I haven't done a full run with this change, but I haven't noticed any problems while testing.

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Myramong
2018-09-09 06:44:08 -03:00
parent 9ff5794489
commit 3bb17f4540
1 changed files with 51 additions and 10 deletions
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61
utilities.asm
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@@ -563,31 +563,72 @@ HexToDec:
PHA
PHA
LDA.w #$9090
STA $7F5003 : STA $7F5005 : STA $7F5006 ; clear digit storage
STA $04 : STA $06 ; temporarily store our decimal values here for speed
PLA
; as far as i can tell we never convert a value larger than 9999, no point in wasting time on this?
; -
; CMP.w #10000 : !BLT +
; INC $03
; !SUB.w #10000 : BRA -
; +
-
CMP.w #10000 : !BLT +
PHA : SEP #$20 : LDA $7F5003 : INC : STA $7F5003 : REP #$20 : PLA
!SUB.w #10000 : BRA -
+ -
CMP.w #1000 : !BLT +
PHA : SEP #$20 : LDA $7F5004 : INC : STA $7F5004 : REP #$20 : PLA
INC $04
!SUB.w #1000 : BRA -
+ -
CMP.w #100 : !BLT +
PHA : SEP #$20 : LDA $7F5005 : INC : STA $7F5005 : REP #$20 : PLA
INC $05
!SUB.w #100 : BRA -
+ -
CMP.w #10 : !BLT +
PHA : SEP #$20 : LDA $7F5006 : INC : STA $7F5006 : REP #$20 : PLA
INC $06
!SUB.w #10 : BRA -
+ -
CMP.w #1 : !BLT +
PHA : SEP #$20 : LDA $7F5007 : INC : STA $7F5007 : REP #$20 : PLA
INC $07
!SUB.w #1 : BRA -
+
+
LDA.b $04 : STA $7F5004 ; move to digit storage
LDA.b $06 : STA $7F5006
PLA
RTL
;--------------------------------------------------------------------------------
;--------------------------------------------------------------------------------
; HexToDec
; in: A(w) - Word to Convert
; out: $7F5003 - $7F5007 (high - low)
;--------------------------------------------------------------------------------
;HexToDec:
; PHA
; PHA
; LDA.w #$9090
; STA $7F5003 : STA $7F5005 : STA $7F5006 ; clear digit storage
; PLA
; -
; CMP.w #10000 : !BLT +
; PHA : SEP #$20 : LDA $7F5003 : INC : STA $7F5003 : REP #$20 : PLA
; !SUB.w #10000 : BRA -
; + -
; CMP.w #1000 : !BLT +
; PHA : SEP #$20 : LDA $7F5004 : INC : STA $7F5004 : REP #$20 : PLA
; !SUB.w #1000 : BRA -
; + -
; CMP.w #100 : !BLT +
; PHA : SEP #$20 : LDA $7F5005 : INC : STA $7F5005 : REP #$20 : PLA
; !SUB.w #100 : BRA -
; + -
; CMP.w #10 : !BLT +
; PHA : SEP #$20 : LDA $7F5006 : INC : STA $7F5006 : REP #$20 : PLA
; !SUB.w #10 : BRA -
; + -
; CMP.w #1 : !BLT +
; PHA : SEP #$20 : LDA $7F5007 : INC : STA $7F5007 : REP #$20 : PLA
; !SUB.w #1 : BRA -
; +
; PLA
;RTL
;--------------------------------------------------------------------------------