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cc65/libsrc/common/labs.s

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;
; Ullrich von Bassewitz, 17.06.1998
;
; long __fastcall__ labs (long val);
; intmax_t __fastcall imaxabs (intmax_t val);
;
.export _labs, _imaxabs
.import negeax
.importzp sreg
_labs:
_imaxabs:
ldy sreg+1 ; test hi byte
bpl L1
jmp negeax ; Negate if negative
L1: rts