mirror of
https://github.com/fadden/6502bench.git
synced 2024-07-14 05:28:55 +00:00
facaa721de
The code was making an unwarranted assumption about how the flags were being set. For example, ORA #$00 can't know if the previous contents of the accumulator were nonzero, only that the instruction hasn't made them nonzero, but instead of marking the Z-flag "indeterminate" it was leaving the flag in its previous state. This produces incorrect results if the previous instruction didn't set its flags from the accumulator contents, e.g. it was an LDX. Test 1003-flags-and-branches has been updated to test these states.
286 lines
4.3 KiB
ArmAsm
286 lines
4.3 KiB
ArmAsm
.cpu "65816"
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* = $1000
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.as
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.xs
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clc
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xce
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sep #$ff
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clv
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cld
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cli
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clc
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lda #$80
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lda #$01
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sed
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sei
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sec
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lda #$ff
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adc #$00
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sep #$ff
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rep #$80
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rep #$40
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rep #$20
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.al
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rep #$10
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.xl
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rep #$08
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rep #$04
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rep #$02
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rep #$01
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sep #$00
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sep #$ff
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.as
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.xs
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rep #$00
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rep #$ff
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.al
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.xl
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lda #$feed
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sec
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xce
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.as
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.xs
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lda #$ff
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rep #$30
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lda #$ff
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clc
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xce
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lda #$ff
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rep #$20
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.al
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sep #$10
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lda #$0000
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ldx #$01
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ldy #$02
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sep #$20
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.as
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rep #$10
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.xl
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lda #$01
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ldx #$0000
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ldy #$0000
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sep #$30
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.xs
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lda #$00
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pha
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plp
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rep #$80
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bpl L105F
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.byte $00
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.byte $00
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L105F sep #$80
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bpl _L1065
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bmi _L1067
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_L1065 .byte $00
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.byte $00
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_L1067 rep #$40
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bvc _L106D
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.byte $00
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.byte $00
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_L106D sep #$40
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bvs _L1073
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.byte $00
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.byte $00
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_L1073 rep #$01
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bcc _L1079
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.byte $00
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.byte $00
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_L1079 sep #$01
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bcs _L107F
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.byte $00
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.byte $00
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_L107F rep #$02
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bne _L1085
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.byte $00
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.byte $00
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_L1085 sep #$02
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beq _L108B
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.byte $00
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.byte $00
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_L108B sep #$ff
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lda #$01
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bne _L1093
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.byte $00
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.byte $db
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_L1093 lda #$00
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beq _L1099
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.byte $00
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.byte $db
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_L1099 bpl _L109D
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.byte $00
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.byte $db
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_L109D lda #$80
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bmi _L10A3
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.byte $00
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.byte $db
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_L10A3 lda #$ff
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and #$00
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beq _L10AB
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.byte $00
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.byte $db
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_L10AB lda #$00
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ldx #$80
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and #$ff
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beq _L10B5
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bne _L10B5
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_L10B5 lda #$ff
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ldx #$00
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and #$7f
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beq _L10BF
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bne _L10BF
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_L10BF bpl _L10C3
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.byte $00
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.byte $db
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_L10C3 lda #$ff
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and #$80
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bmi _L10CB
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brk
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.byte $db
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_L10CB lda #$00
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ldx #$80
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bne _L10D3
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.byte $00
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.byte $db
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_L10D3 ora #$00
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beq _L10D9
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bne _L10D9
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_L10D9 ora #$01
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bne _L10DF
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.byte $00
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.byte $db
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_L10DF lda #$00
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ldx #$80
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bmi _L10E7
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.byte $00
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.byte $db
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_L10E7 ora #$7f
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bpl _L10EF
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bmi _L10EF
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.byte $00
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.byte $db
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_L10EF ora #$80
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bmi _L10F5
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.byte $00
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.byte $db
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_L10F5 lda _L10F5
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sec
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ror a
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bmi _L10FE
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.byte $00
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.byte $dc
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_L10FE clc
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ror a
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bpl _L1104
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.byte $00
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.byte $dc
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_L1104 lda #$00
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sec
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rol a
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bne _L110C
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.byte $00
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.byte $dc
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_L110C lda #$ff
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lsr a
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bpl _L1113
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.byte $00
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.byte $dd
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_L1113 clc
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php
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sec
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plp
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bcc _L111B
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.byte $00
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.byte $00
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_L111B sec
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bcs _L111F
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_L111E clc
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_L111F lda $33
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beq _L111E
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bcs _L1127
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lda $44
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_L1127 nop
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rep #$20
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.al
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sep #$10
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jsr _L1143
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rep #$30
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.xl
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jsr _L1149
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sep #$30
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.as
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.xs
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jsr _L1149
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rep #$20
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.al
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sep #$10
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jsr _L1143
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sep #$30
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.as
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rts
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.al
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_L1143 lda #$1234
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ldx #$ff
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rts
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.as
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_L1149 lda #$ff
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ldx #$ee
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ldy #$dd
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rts
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