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cc65/libsrc/runtime/asrax4.s
cuz 6d8cdae722 Runtime function improvements by Piotr Fusik
git-svn-id: svn://svn.cc65.org/cc65/trunk@2577 b7a2c559-68d2-44c3-8de9-860c34a00d81
2003-10-28 08:47:47 +00:00

27 lines
319 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