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cc65/libsrc/runtime/asrax2.s

20 lines
361 B
ArmAsm

;
; Ullrich von Bassewitz, 06.08.1998
;
; CC65 runtime: Scale the primary register by 4
;
.export asrax2
.importzp tmp1
asrax2: stx tmp1
cpx #$80 ; Put bit 7 into carry
ror tmp1
ror a
cpx #$80
ror tmp1
ror a
ldx tmp1
rts