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cc65/libsrc/runtime/asrax4.s
cuz d55c271c2a More shift routines
git-svn-id: svn://svn.cc65.org/cc65/trunk@820 b7a2c559-68d2-44c3-8de9-860c34a00d81
2001-07-25 21:36:01 +00:00

29 lines
425 B
ArmAsm

;
; Ullrich von Bassewitz, 25.07.2001
;
; 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
ldx tmp1
cpx #$80
ror tmp1
ror a
ldx tmp1
cpx #$80
ror tmp1
ror a
ldx tmp1
cpx #$80
ror tmp1
ror a
ldx tmp1
rts