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27 lines
421 B
ArmAsm
27 lines
421 B
ArmAsm
;
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; Ullrich von Bassewitz, 05.08.1998
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;
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; int abs (int x);
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; and
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; CC65 runtime: negation on ints
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;
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.export negax
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.export _abs
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_abs: cpx #$00 ; test hi byte
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bpl L1 ; don't touch if positive
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negax: clc
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eor #$FF
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adc #1
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pha
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txa
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eor #$FF
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adc #0
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tax
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pla
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L1: rts
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