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cc65/libsrc/common/labs.s
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ArmAsm

;
; Ullrich von Bassewitz, 17.06.1998
;
; long labs (long x);
;
.export _labs
.import negeax, tsteax
.importzp sreg
_labs: ldy sreg+1 ; test hi byte
bpl L1
jmp negeax ; Negate if negative
L1: rts