linux/arch/sparc/lib/muldi3.S
David S. Miller 1b35a57b1c sparc32: Kill off software 32-bit multiply/divide routines.
For the explicit calls to .udiv/.umul in assembler, I made a
mechanical (read as: safe) transformation.  I didn't attempt
to make any simplifications.

In particular, __ndelay and __udelay can be simplified significantly.
Some of the %y reads are unnecessary and these routines have no need
any longer for allocating a register window, they can be leaf
functions.

Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-15 11:23:47 -07:00

76 lines
1.9 KiB
ArmAsm

/* Copyright (C) 1989, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
This file is part of GNU CC.
GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU CC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING. If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
.text
.align 4
.globl __muldi3
__muldi3:
save %sp, -104, %sp
wr %g0, %i1, %y
sra %i3, 0x1f, %g2
and %i1, %g2, %g2
andcc %g0, 0, %g1
mulscc %g1, %i3, %g1
mulscc %g1, %i3, %g1
mulscc %g1, %i3, %g1
mulscc %g1, %i3, %g1
mulscc %g1, %i3, %g1
mulscc %g1, %i3, %g1
mulscc %g1, %i3, %g1
mulscc %g1, %i3, %g1
mulscc %g1, %i3, %g1
mulscc %g1, %i3, %g1
mulscc %g1, %i3, %g1
mulscc %g1, %i3, %g1
mulscc %g1, %i3, %g1
mulscc %g1, %i3, %g1
mulscc %g1, %i3, %g1
mulscc %g1, %i3, %g1
mulscc %g1, %i3, %g1
mulscc %g1, %i3, %g1
mulscc %g1, %i3, %g1
mulscc %g1, %i3, %g1
mulscc %g1, %i3, %g1
mulscc %g1, %i3, %g1
mulscc %g1, %i3, %g1
mulscc %g1, %i3, %g1
mulscc %g1, %i3, %g1
mulscc %g1, %i3, %g1
mulscc %g1, %i3, %g1
mulscc %g1, %i3, %g1
mulscc %g1, %i3, %g1
mulscc %g1, %i3, %g1
mulscc %g1, %i3, %g1
mulscc %g1, %i3, %g1
mulscc %g1, 0, %g1
add %g1, %g2, %l2
rd %y, %o1
mov %o1, %l3
mov %i1, %o0
mov %i2, %o1
umul %o0, %o1, %o0
mov %o0, %l0
mov %i0, %o0
mov %i3, %o1
umul %o0, %o1, %o0
add %l0, %o0, %l0
mov %l2, %i0
add %l2, %l0, %i0
ret
restore %g0, %l3, %o1