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Fixed the result of the % operator for longs

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git-svn-id: svn://svn.cc65.org/cc65/trunk@1409 b7a2c559-68d2-44c3-8de9-860c34a00d81
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cuz
2002-09-28 19:55:19 +00:00
parent 3aab67401e
commit 689202057c
3 changed files with 55 additions and 37 deletions
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36
libsrc/runtime/lmod.s
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@@ -8,19 +8,33 @@
; values if $8000, in which case the negate will fail.
.export tosmodeax
.import poplsargs, udiv32, adjlsres
.importzp sreg, ptr1, ptr2, tmp3, tmp4
.import poplsargs, udiv32, negeax
.importzp sreg, ptr1, ptr2, tmp1, tmp3, tmp4
tosmodeax:
jsr poplsargs ; Get arguments from stack, adjust sign
jsr udiv32 ; Do the division
lda ptr1 ; Remainder is in (ptr2:tmp3:tmp4)
lda ptr2
ldx ptr2+1
ldy tmp3
sty sreg
ldy tmp4
sty sreg+1
jmp adjlsres ; Adjust the sign of the result if needed
jsr udiv32 ; Do the division, remainder is in (ptr2:tmp3:tmp4)
; Load the result with the exception of the low byte
ldx ptr2+1
ldy tmp3
sty sreg
ldy tmp4
sty sreg+1
; Check the sign of the result. It is the sign of the left operand.
lda tmp1 ; Check sign of left operand
bpl Pos ; Jump if result is positive
; Result is negative
lda ptr2 ; Load byte 0 of result
jmp negeax ; Negate result
; Result is positive
Pos: lda ptr2 ; Load byte 0 of result
rts ; Done