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81 lines
1.9 KiB
ArmAsm
81 lines
1.9 KiB
ArmAsm
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; Copyright 2019 faddenSoft. All Rights Reserved.
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; See the LICENSE.txt file for distribution terms (Apache 2.0).
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;
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; Assembler: Merlin 32
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; Exercise cycle counting. We use 65816 to test the behavior with variable-
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; width registers. This means we're not testing the 65C02 D-flag behavior
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; or some other non-65816 quirks. If that becomes an issue we'll need to
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; create additional tests.
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;
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; Very little editing required. Just set the initial ORG and add
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; "__ENABLE_CYCLE_COUNTS" to the list of project symbols.
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org $10f0
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start sec
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xce
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mx %11
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bra cont ;crosses page boundary
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ds 20
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cont bra near
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near
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lda #$00
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beq next ;always (3 cycles)
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brk $00
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next bne next ;never (2 cycles)
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lda $1234
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beq maybe ;sometimes (2+ cycles)
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brk $01 ;(7 cycles)
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maybe lda $22,S
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trb $02
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asl $03,x
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clc
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xce
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rep #$30
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mx %00
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lda #$11
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ldy #$22
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trb $04 ;should be +2 cycles
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asl $05,x ;should be +2 cycles
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ldx $1235
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beq maybe2
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brk $02 ;(8 cycles)
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maybe2 lda $33,S
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beq maybe3
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bra start ;crosses page boundary, no + when E=0
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maybe3
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rep #$20
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sep #$10
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sta $10
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stx $11
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sty $12
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rep #$10
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sep #$20
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sta $11
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stx $12
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sty $13
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rep #$30
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; On the 65816, the setting of the decimal flag should NOT have any effect.
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lda $1234
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adc #$66
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adc $1235
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sed
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adc #$77
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adc $1236
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sec
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xce
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sbc #$88
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sbc $1237
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cld
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sbc #$99
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sbc $1238
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rts
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