mirror of
https://github.com/fadden/6502bench.git
synced 2024-11-05 06:04:36 +00:00
81 lines
1.9 KiB
ArmAsm
81 lines
1.9 KiB
ArmAsm
|
; Copyright 2019 faddenSoft. All Rights Reserved.
|
||
|
|
; See the LICENSE.txt file for distribution terms (Apache 2.0).
|
||
|
|
;
|
||
|
|
; Assembler: Merlin 32
|
||
|
|
|
||
|
|
; Exercise cycle counting. We use 65816 to test the behavior with variable-
|
||
|
|
; width registers. This means we're not testing the 65C02 D-flag behavior
|
||
|
|
; or some other non-65816 quirks. If that becomes an issue we'll need to
|
||
|
|
; create additional tests.
|
||
|
|
;
|
||
|
|
; Very little editing required. Just set the initial ORG and add
|
||
|
|
; "__ENABLE_CYCLE_COUNTS" to the list of project symbols.
|
||
|
|
|
||
|
|
org $10f0
|
||
|
|
start sec
|
||
|
|
xce
|
||
|
|
mx %11
|
||
|
|
bra cont ;crosses page boundary
|
||
|
|
ds 20
|
||
|
|
|
||
|
|
cont bra near
|
||
|
|
near
|
||
|
|
|
||
|
|
lda #$00
|
||
|
|
beq next ;always (3 cycles)
|
||
|
|
brk $00
|
||
|
|
next bne next ;never (2 cycles)
|
||
|
|
lda $1234
|
||
|
|
beq maybe ;sometimes (2+ cycles)
|
||
|
|
brk $01 ;(7 cycles)
|
||
|
|
maybe lda $22,S
|
||
|
|
trb $02
|
||
|
|
asl $03,x
|
||
|
|
|
||
|
|
clc
|
||
|
|
xce
|
||
|
|
rep #$30
|
||
|
|
mx %00
|
||
|
|
|
||
|
|
lda #$11
|
||
|
|
ldy #$22
|
||
|
|
trb $04 ;should be +2 cycles
|
||
|
|
asl $05,x ;should be +2 cycles
|
||
|
|
ldx $1235
|
||
|
|
beq maybe2
|
||
|
|
brk $02 ;(8 cycles)
|
||
|
|
maybe2 lda $33,S
|
||
|
|
beq maybe3
|
||
|
|
bra start ;crosses page boundary, no + when E=0
|
||
|
|
maybe3
|
||
|
|
|
||
|
|
rep #$20
|
||
|
|
sep #$10
|
||
|
|
sta $10
|
||
|
|
stx $11
|
||
|
|
sty $12
|
||
|
|
rep #$10
|
||
|
|
sep #$20
|
||
|
|
sta $11
|
||
|
|
stx $12
|
||
|
|
sty $13
|
||
|
|
rep #$30
|
||
|
|
|
||
|
|
; On the 65816, the setting of the decimal flag should NOT have any effect.
|
||
|
|
lda $1234
|
||
|
|
adc #$66
|
||
|
|
adc $1235
|
||
|
|
sed
|
||
|
|
adc #$77
|
||
|
|
adc $1236
|
||
|
|
|
||
|
|
sec
|
||
|
|
xce
|
||
|
|
sbc #$88
|
||
|
|
sbc $1237
|
||
|
|
cld
|
||
|
|
sbc #$99
|
||
|
|
sbc $1238
|
||
|
|
rts
|
||
|
|
|