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[ARM] 3049/1: More optimized libgcc functions

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Patch from Nicolas Pitre

This patch gets rid of the last C implementations of needed libgcc
functions for the kernel, replacing them with optimized assembly
versions.

Those functions are:

__ashldi3
__ashrdi3
__lshrdi3
__muldi3
__ucmpdi2

The first 3 were lifted from gcc, the other two were written from scratch.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Nicolas Pitre
2005-10-30 23:08:03 +00:00
committed by Russell King
parent cb7610d018
commit f741a1aab5
11 changed files with 223 additions and 312 deletions
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48
arch/arm/lib/ashldi3.S Normal file
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@@ -0,0 +1,48 @@
/* Copyright 1995, 1996, 1998, 1999, 2000, 2003, 2004, 2005
Free Software Foundation, Inc.
This file 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.
In addition to the permissions in the GNU General Public License, the
Free Software Foundation gives you unlimited permission to link the
compiled version of this file into combinations with other programs,
and to distribute those combinations without any restriction coming
from the use of this file. (The General Public License restrictions
do apply in other respects; for example, they cover modification of
the file, and distribution when not linked into a combine
executable.)
This file 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 this program; see the file COPYING. If not, write to
the Free Software Foundation, 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA. */
#include <linux/linkage.h>
#ifdef __ARMEB__
#define al r1
#define ah r0
#else
#define al r0
#define ah r1
#endif
ENTRY(__ashldi3)
subs r3, r2, #32
rsb ip, r2, #32
movmi ah, ah, lsl r2
movpl ah, al, lsl r3
orrmi ah, ah, al, lsr ip
mov al, al, lsl r2
mov pc, lr