6502/cc65
1
0
Fork 0
mirror of https://github.com/cc65/cc65.git synced 2024-10-01 15:54:59 +00:00
Code Issues Projects Releases Wiki Activity

Fixed wrong compares (new code by Piotr Fusik)

Browse Source 
git-svn-id: svn://svn.cc65.org/cc65/trunk@1243 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz 2002-04-17 18:55:21 +00:00
parent 99de22ffe2
commit fe027ce916
2 changed files with 100 additions and 94 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

87
libsrc/runtime/icmp.s
View File

@ -1,43 +1,44 @@
;
; Ullrich von Bassewitz, 10.12.1998
;
; Integer compare function - used by the compare operators
;
.export tosicmp
.importzp sp, sreg
tosicmp:
sta sreg
stx sreg+1 ; Save ax
ldy #$01
lda (sp),y ; Get high byte
tax
dey
lda (sp),y ; Get low byte
; Inline incsp2 for better performance
inc sp ; 5
bne @L1 ; 3
inc sp+1 ; (5)
@L1: inc sp ; 5
bne @L2 ; 3
inc sp+1 ; (5)
; Do the compare.
@L2: cpx sreg+1 ; Compare high byte
bne @L3
cmp sreg ; Compare low byte
beq @L3
bcs @L4
lda #$FF ; Set the N flag
@L3: rts
@L4: lda #$01 ; Clear the N flag
rts
;
; Piotr Fusik, 15.04.2002
; originally by Ullrich von Bassewitz
;
; Integer compare function - used by the compare operators
;
.export tosicmp
.importzp sp, sreg
tosicmp:
sta sreg
stx sreg+1 ; Save ax
ldy #$00
lda (sp),y ; Get low byte
tax
inc sp ; 5
bne @L1 ; 3
inc sp+1 ; (5)
@L1:
lda (sp),y ; Get high byte
inc sp ; 5
bne @L2 ; 3
inc sp+1 ; (5)
; Do the compare.
@L2: sec
sbc sreg+1 ; Compare high byte
bne @L4
cpx sreg ; Compare low byte
beq @L3
adc #$FF ; If the C flag is set then clear the N flag
ora #$01 ; else set the N flag
@L3: rts
@L4: bvc @L3
eor #$FF ; Fix the N flag if overflow
ora #$01 ; Clear the Z flag
rts

107
libsrc/runtime/lcmp.s
View File

@ -1,51 +1,56 @@
;
; Ullrich von Bassewitz, 10.12.1998
;
; Long int compare function - used by the compare operators
;
.export toslcmp
.import incsp4
.importzp sp, sreg, ptr1
toslcmp:
sta ptr1
stx ptr1+1 ; EAX now in sreg:ptr1
ldy #$03
lda (sp),y
cmp sreg+1
bne L4
dey
lda (sp),y
cmp sreg
bne L1
dey
lda (sp),y
cmp ptr1+1
bne L1
dey
lda (sp),y
cmp ptr1
L1: php ; Save flags
jsr incsp4 ; Drop TOS
plp ; Restore the flags
beq L2
bcs L3
lda #$FF ; Set the N flag
L2: rts
L3: lda #$01 ; Clear the N flag
rts
L4: php ; Save flags
jsr incsp4 ; Drop TOS
plp ; Restore flags
rts
;
; Piotr Fusik, 15.04.2002
; originally by Ullrich von Bassewitz
;
; Long int compare function - used by the compare operators
;
.export toslcmp
.import incsp4
.importzp sp, sreg, ptr1
toslcmp:
sta ptr1
stx ptr1+1 ; EAX now in sreg:ptr1
ldy #$03
lda (sp),y
sec
sbc sreg+1
bne L4
dey
lda (sp),y
cmp sreg
bne L1
dey
lda (sp),y
cmp ptr1+1
bne L1
dey
lda (sp),y
cmp ptr1
L1: php ; Save flags
jsr incsp4 ; Drop TOS
plp ; Restore the flags
beq L2
bcs L3
lda #$FF ; Set the N flag
L2: rts
L3: lda #$01 ; Clear the N flag
rts
L4: bvc L5
eor #$FF ; Fix the N flag if overflow
ora #$01 ; Clear the Z flag
L5: php ; Save flags
jsr incsp4 ; Drop TOS
plp ; Restore flags
rts