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cc65/libsrc/runtime/asreax2.s
cuz ea2c59ef8e Remove unneeded code
git-svn-id: svn://svn.cc65.org/cc65/trunk@821 b7a2c559-68d2-44c3-8de9-860c34a00d81
2001-07-25 21:37:52 +00:00

26 lines
431 B
ArmAsm

;
; Ullrich von Bassewitz, 06.08.1998
;
; CC65 runtime: Scale the 32 bit primary register by 4
;
.export asreax2
.importzp sreg, tmp1
asreax2:
stx tmp1
ldx sreg+1
cpx #$80 ; Get bit 7 into carry
ror sreg+1
ror sreg
ror tmp1
ror a
cpx #$80 ; Get bit 7 into carry
ror sreg+1
ror sreg
ror tmp1
ror a
ldx tmp1
rts