diff options
| author | Nicolas Pitre <nico@cam.org> | 2005-10-31 00:08:03 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2005-10-31 00:08:03 +0100 |
| commit | f741a1aab5fd7892927208ca37eb86b9ea85784a (patch) | |
| tree | c4060ea9292f5e8f98e87ef354079bc900d81243 /arch/arm/lib/lshrdi3.S | |
| parent | [ARM] Clean up dmabounce (diff) | |
| download | linux-f741a1aab5fd7892927208ca37eb86b9ea85784a.tar.xz linux-f741a1aab5fd7892927208ca37eb86b9ea85784a.zip | |
[ARM] 3049/1: More optimized libgcc functions
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>
Diffstat (limited to 'arch/arm/lib/lshrdi3.S')
| -rw-r--r-- | arch/arm/lib/lshrdi3.S | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/arch/arm/lib/lshrdi3.S b/arch/arm/lib/lshrdi3.S new file mode 100644 index 000000000000..46c2ed19ec95 --- /dev/null +++ b/arch/arm/lib/lshrdi3.S @@ -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(__lshrdi3) + + subs r3, r2, #32 + rsb ip, r2, #32 + movmi al, al, lsr r2 + movpl al, ah, lsr r3 + orrmi al, al, ah, lsl ip + mov ah, ah, lsr r2 + mov pc, lr + |