* Copyright (c) 2017 Stephen Heumann
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.


* Right-rotate 32-bit value in &loc (DP or 16-bit address) by &n positions
	macro
	ROTR4	&loc,&n
	aif	&n>16,.dorotl
	lda	&loc+2
	lcla	&i
&i	seta	&n
.rotrloop
	lsr	a		;to set carry
	ror     &loc
	ror     &loc+2
&i	seta	&i-1
	aif	&i>0,.rotrloop
	ago	.end
.dorotl
	ROTL4	&loc,32-&n
.end
	mend

* Left-rotate 32-bit value in &loc (DP or 16-bit address) by &n positions
	macro
	ROTL4	&loc,&n
	aif	&n>16,.dorotr
        lda     &loc
	lcla	&i
&i	seta	&n
.rotlloop
        asl     a		;to set carry
        rol     &loc+2
        rol     &loc
&i	seta	&i-1
	aif	&i>0,.rotlloop
	ago	.end
.dorotr
	ROTR4	&loc,32-&n
.end
	mend

* &to := &from ROTR4 &n
	macro
	ROTR4MOVE &to,&from,&n
	aif	&n>16,.dorotl
        lda     &from
        sta     &to
        lda     &from+2
        sta     &to+2
	lcla	&i
&i	seta	&n
.rotrloop
	lsr	a		;to set carry
	ror     &to
	ror     &to+2
&i	seta	&i-1
	aif	&i>0,.rotrloop
	ago	.end
dorotl
	ROTL4MOVE &to,&from,32-&n
.end
	mend

* &to := &from ROTL4 &n
	macro
	ROTL4MOVE &to,&from,&n
	aif	&n>16,.dorotr
        lda     &from+2
        sta     &to+2
        lda     &from
        sta     &to
	lcla	&i
&i	seta	&n
.rotlloop
        asl     a		;to set carry
        rol     &to+2
        rol     &to
&i	seta	&i-1
	aif	&i>0,.rotlloop
	ago	.end
.dorotr
	ROTR4MOVE &to,&from,32-&n
.end
	mend