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Fix for 8x16 multiplication if operants are swapped.

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IrgendwerA8
2018-05-22 18:35:05 +02:00
parent ba2c6d9008
commit 808d3ab471
1 changed files with 2 additions and 1 deletions
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3
libsrc/runtime/mul.s
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@@ -62,7 +62,8 @@ tosumulax:
@L4: ldy ptr1 ; Save right operand (8 bit) @L4: ldy ptr1 ; Save right operand (8 bit)
ldx ptr4 ; Copy left 16 bit operand to right ldx ptr4 ; Copy left 16 bit operand to right
stx ptr1 stx ptr1
ldx ptr4+1 ; Don't store, this is done later ldx ptr4+1 ; swap high-byte too
stx ptr1+1
sty ptr4 ; Copy low 8 bit of right op to left sty ptr4 ; Copy low 8 bit of right op to left
ldy #8 ldy #8
jmp mul8x16a jmp mul8x16a