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make sure flags are reset

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folkert van heusden 2022-03-13 14:30:09 +01:00
parent 05a55123ac
commit 48881f7d5a
1 changed files with 12 additions and 2 deletions
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14
tester-psw.mac
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@ -28,13 +28,16 @@ psw_store_retrieve_fail:
CALL print_start
RET
psw_flags_trigger:
clear_flags:
CLC
CLV
CLZ
CLN
RET
psw_flags_trigger:
; test zero bit
CALL clear_flags
MOV #0,R1
TST R1
BEQ psw_trigger_1_next
@ -43,6 +46,7 @@ psw_flags_trigger:
JMP psw_trigger_fail
psw_trigger_1_next:
CALL clear_flags
MOV #128.,R1
TST R1
BNE psw_trigger_2_next
@ -50,7 +54,7 @@ psw_trigger_1_next:
JMP psw_trigger_fail
psw_trigger_2_next:
CALL clear_flags
; test overflow bit (overflow)
MOV #127.,R1
INCB R1
@ -60,6 +64,7 @@ psw_trigger_2_next:
; test overflow bit (underflow)
psw_trigger_3_next:
CALL clear_flags
MOV #-128.,R1
DECB R1
BVS psw_trigger_4_next
@ -67,6 +72,7 @@ psw_trigger_3_next:
JMP psw_trigger_fail
psw_trigger_4_next:
CALL clear_flags
; test minus bit
MOV #127.,R1
INCB R1
@ -75,6 +81,7 @@ psw_trigger_4_next:
JMP psw_trigger_fail
psw_trigger_5_next:
CALL clear_flags
MOV #128.,R1
DECB R1
BPL psw_trigger_6_next
@ -82,6 +89,7 @@ psw_trigger_5_next:
JMP psw_trigger_fail
psw_trigger_6_next:
CALL clear_flags
; carry flag test
MOV #128.,R1
ASLB R1
@ -90,6 +98,7 @@ psw_trigger_6_next:
JMP psw_trigger_fail
psw_trigger_7_next:
CALL clear_flags
MOV #64.,R1
ASLB R1
BCC psw_trigger_8_next
@ -100,6 +109,7 @@ psw_trigger_8_next:
RET
psw_trigger_fail:
CALL clear_flags
; emit test number
MOV R2,R0
CALL print_binary