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sys: Add [u]divmoddi4 intrinsics on i386.

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GCC 12 uses these in several places when building the i386 kernel.
They are very similar to [u]divdiv3 except that they return both
the quotient and the remainder.

Reviewed by:	imp
Differential Revision:	https://reviews.freebsd.org/D40817
This commit is contained in:
John Baldwin 2023-07-01 12:22:44 -07:00
parent ec41a96daa
commit cc4f247fb9
4 changed files with 110 additions and 0 deletions
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2
sys/conf/files.i386
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@ -140,6 +140,7 @@ isa/vga_isa.c optional vga
kern/imgact_aout.c optional compat_aout
kern/subr_sfbuf.c standard
libkern/divdi3.c standard
libkern/divmoddi4.c standard
libkern/ffsll.c standard
libkern/flsll.c standard
libkern/memcmp.c standard
@ -149,6 +150,7 @@ libkern/qdivrem.c standard
libkern/strlen.c standard
libkern/ucmpdi2.c standard
libkern/udivdi3.c standard
libkern/udivmoddi4.c standard
libkern/umoddi3.c standard
#
# x86 real mode BIOS support, required by dpms/pci/vesa

60
sys/libkern/divmoddi4.c Normal file
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@ -0,0 +1,60 @@
/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* 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.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
*/
#include <libkern/quad.h>
/*
* Divide two signed quads.
* ??? if -1/2 should produce -1 on this machine, this code is wrong
*/
quad_t
__divmoddi4(quad_t a, quad_t b, quad_t *rem)
{
u_quad_t ua, ub, uq, urem;
int neg;
if (a < 0)
ua = -(u_quad_t)a, neg = 1;
else
ua = a, neg = 0;
if (b < 0)
ub = -(u_quad_t)b, neg ^= 1;
else
ub = b;
uq = __qdivrem(ua, ub, &urem);
if (rem != 0)
*rem = urem;
return (neg ? -uq : uq);
}

2
sys/libkern/quad.h
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@ -105,10 +105,12 @@ quad_t __ashldi3(quad_t, qshift_t);
quad_t __ashrdi3(quad_t, qshift_t);
int __cmpdi2(quad_t a, quad_t b);
quad_t __divdi3(quad_t a, quad_t b);
quad_t __divmoddi4(quad_t a, quad_t b, quad_t *rem);
quad_t __lshrdi3(quad_t, qshift_t);
quad_t __moddi3(quad_t a, quad_t b);
u_quad_t __qdivrem(u_quad_t u, u_quad_t v, u_quad_t *rem);
u_quad_t __udivdi3(u_quad_t a, u_quad_t b);
u_quad_t __udivmoddi4(u_quad_t a, u_quad_t b, u_quad_t *rem);
u_quad_t __umoddi3(u_quad_t a, u_quad_t b);
int __ucmpdi2(u_quad_t a, u_quad_t b);

46
sys/libkern/udivmoddi4.c Normal file
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@ -0,0 +1,46 @@
/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* 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.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
*/
#include <libkern/quad.h>
/*
* Divide two unsigned quads.
*/
u_quad_t
__udivmoddi4(u_quad_t a, u_quad_t b, u_quad_t *rem)
{
return (__qdivrem(a, b, rem));
}