/*      $NetBSD: ashrdi3.S,v 1.1 2020/08/16 06:43:43 isaki Exp $        */

/*
 * Copyright (C) 2020 Tetsuya Isaki. All rights reserved.
 * Copyright (C) 2020 Y.Sugahara (moveccr). All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * Size optimized version for primary bootloader.
 */

#include <machine/asm.h>

ASENTRY_NOPROFILE(__ashrdi3)
                moveml  %sp@(4),%d0-%d1/%a0     | %d0:%d1 = quad value
                                                | %a0     = shift count
                jbra    start
loop:
                asrl    #1,%d0                  | %d0:X >>>= 1
                roxrl   #1,%d1                  | X:%d1 >>= 1
start:
                subql   #1,%a0                  | sub %a0 doesn't affect ccr,
                tstl    %a0                     |  but this extra TST op is
                                                |  smaller than push/pop %d2.
                jpl     loop
                rts


#if defined(SELFTEST)
#include "iocscall.h"
                .macro  PRINT   msg
                leal    \msg,%a1
                IOCS(__B_PRINT)
                .endm

                .macro  TEST    name
                leal    \name,%a2
                jbsr    test
                .endm

ASENTRY_NOPROFILE(selftest_ashrdi3)
                moveml  %d2-%d7/%a2-%a6,%sp@-
                PRINT   %pc@(msg_testname)

                TEST    test0
                TEST    test1p
                TEST    test1m
                TEST    test4p
                TEST    test4m
                TEST    test63p
                TEST    test63m

                PRINT   %pc@(msg_crlf)
                moveml  %sp@+,%d2-%d7/%a2-%a6
                rts

test:
                moveml  %a2@+,%d0-%d2           | %d0:%d1 = value
                                                | %d2     = count
                moveml  %d0-%d2,%sp@-
                jbsr    __ashrdi3
                leal    %sp@(12),%sp

                cmpl    %a2@+,%d0               | compare high word
                jne     fail
                cmpl    %a2@+,%d1               | compare low word
                jne     fail
                PRINT   %pc@(msg_ok)
                rts
fail:
                PRINT   %pc@(msg_fail)
                rts

test0:          | count = 0
                .long   0x11223344, 0x55667788
                .long   0
                .long   0x11223344, 0x55667788

test1p:         | count = 1
                .long   0x11223344, 0x55667788
                .long   1
                .long   0x089119a2, 0x2ab33bc4

test1m:         | count = 1 (negative value)
                .long   0x91223344, 0x55667788
                .long   1
                .long   0xc89119a2, 0x2ab33bc4

test4p:         | count = 4
                .long   0x11223344, 0x55667788
                .long   4
                .long   0x01122334, 0x45566778

test4m:         | count = 4 (negative value)
                .long   0x91223344, 0x55667788
                .long   4
                .long   0xf9122334, 0x45566778

test63p:        | count = 63
                .long   0x41223344, 0x55667788
                .long   63
                .long   0x00000000, 0x00000000

test63m:        | count = 63 (negative value)
                .long   0x91223344, 0x55667788
                .long   63
                .long   0xffffffff, 0xffffffff

msg_testname:
                .asciz  "__ashrdi3"
msg_ok:
                .asciz  " ok"
msg_fail:
                .asciz  " fail"
msg_crlf:
                .asciz  "\r\n"

#endif