cc65/libsrc/runtime/asrax4.s

27 lines
510 B
ArmAsm

;
; Piotr Fusik, 24.10.2003
; originally by Ullrich von Bassewitz
;
; CC65 runtime: Scale the primary register by 16
;
.export asrax4
.importzp tmp1
asrax4: stx tmp1
cpx #$80 ; Put bit 7 into carry
ror tmp1
ror a
cpx #$80
ror tmp1
ror a
cpx #$80
ror tmp1
ror a
cpx #$80
ror tmp1
ror a
ldx tmp1
rts