hwmuldiv.s revision 9a70fc3be3b1e966bf78825cdb8d509963a6f0a1
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
.file "hwmuldiv.s"
#include <sys/asm_linkage.h>
/*
* Versions of .mul .umul .div .udiv .rem .urem written using
* appropriate SPARC V8 instructions.
*/
ENTRY(.mul)
smul %o0, %o1, %o0
rd %y, %o1
sra %o0, 31, %o2
retl
cmp %o1, %o2 ! return with Z set if %y == (%o0 >> 31)
SET_SIZE(.mul)
ENTRY(.umul)
umul %o0, %o1, %o0
rd %y, %o1
retl
tst %o1 ! return with Z set if high order bits are zero
SET_SIZE(.umul)
ENTRY(.div)
sra %o0, 31, %o2
wr %g0, %o2, %y
nop
nop
nop
sdivcc %o0, %o1, %o0
bvs,a 1f
xnor %o0, %g0, %o0 ! Corbett Correction Factor
1: retl
nop
SET_SIZE(.div)
ENTRY(.udiv)
wr %g0, %g0, %y
nop
nop
retl
udiv %o0, %o1, %o0
SET_SIZE(.udiv)
ENTRY(.rem)
sra %o0, 31, %o4
wr %o4, %g0, %y
nop
nop
nop
sdivcc %o0, %o1, %o2
bvs,a 1f
xnor %o2, %g0, %o2 ! Corbett Correction Factor
1: smul %o2, %o1, %o2
retl
sub %o0, %o2, %o0
SET_SIZE(.rem)
ENTRY(.urem)
wr %g0, %g0, %y
nop
nop
nop
udiv %o0, %o1, %o2
umul %o2, %o1, %o2
retl
sub %o0, %o2, %o0
SET_SIZE(.urem)
/*
* v8plus versions of __{u,}{mul,div,rem}64 compiler support routines
*/
/*
* Convert 32-bit arg pairs in %o0:o1 and %o2:%o3 to 64-bit args in %o1 and %o2
*/
#define ARGS_TO_64 \
sllx %o0, 32, %o0; \
srl %o1, 0, %o1; \
sllx %o2, 32, %o2; \
srl %o3, 0, %o3; \
or %o0, %o1, %o1; \
or %o2, %o3, %o2
!
! division, signed
!
ENTRY(__div64)
ARGS_TO_64
sdivx %o1, %o2, %o1
retl
srax %o1, 32, %o0
SET_SIZE(__div64)
!
! division, unsigned
!
ENTRY(__udiv64)
ARGS_TO_64
udivx %o1, %o2, %o1
retl
srax %o1, 32, %o0
SET_SIZE(__udiv64)
!
! multiplication, signed and unsigned
!
ENTRY(__mul64)
ALTENTRY(__umul64)
ARGS_TO_64
sub %o1, %o2, %o0 ! %o0 = a - b
movrlz %o0, %g0, %o0 ! %o0 = (a < b) ? 0 : a - b
sub %o1, %o0, %o1 ! %o1 = (a < b) ? a : b = min(a, b)
add %o2, %o0, %o2 ! %o2 = (a < b) ? b : a = max(a, b)
mulx %o1, %o2, %o1 ! min(a, b) in "rs1" for early exit
retl
srax %o1, 32, %o0
SET_SIZE(__mul64)
SET_SIZE(__umul64)
!
! unsigned remainder
!
ENTRY(__urem64)
ARGS_TO_64
udivx %o1, %o2, %o3
mulx %o3, %o2, %o3
sub %o1, %o3, %o1
retl
srax %o1, 32, %o0
SET_SIZE(__urem64)
!
! signed remainder
!
ENTRY(__rem64)
ARGS_TO_64
sdivx %o1, %o2, %o3
mulx %o2, %o3, %o3
sub %o1, %o3, %o1
retl
srax %o1, 32, %o0
SET_SIZE(__rem64)