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88e72d1eb8
Cycle counting is CPU-specific. The 2020 test exercises the 65816, but there are things unique to 6502 and 65C02 that should also be checked if we want to be thorough. No changes to the test itself.
81 lines
1.9 KiB
ArmAsm
81 lines
1.9 KiB
ArmAsm
; 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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