/* $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