cc65/libsrc/runtime/asreax4.s

;
; Ullrich von Bassewitz, 25.07.2001
;
; CC65 runtime: Scale the 32 bit primary register by 16
;

        .export         asreax4
        .importzp       sreg, tmp1

asreax4:
        stx     tmp1
        ldx     sreg+1
        ldy     #4
@L1:    cpx     #$80            ; Get bit 7 into carry
        ror     sreg+1
        ror     sreg
        ror     tmp1
        ror     a
        dey
        bne     @L1
        ldx     tmp1
        rts
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			`;`
			`; Ullrich von Bassewitz, 25.07.2001`
			`;`
			`; CC65 runtime: Scale the 32 bit primary register by 16`
			`;`

Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:56:54 +02:00			`.export asreax4`
			`.importzp sreg, tmp1`
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
			`asreax4:`
Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:56:54 +02:00			`stx tmp1`
			`ldx sreg+1`
			`ldy #4`
			`@L1: cpx #$80 ; Get bit 7 into carry`
			`ror sreg+1`
			`ror sreg`
			`ror tmp1`
			`ror a`
			`dey`
			`bne @L1`
			`ldx tmp1`
			`rts`
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