mirror of
https://github.com/torvalds/linux.git
synced 2024-09-28 02:43:02 +00:00
f741a1aab5
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>
45 lines
837 B
ArmAsm
45 lines
837 B
ArmAsm
/*
|
|
* linux/arch/arm/lib/muldi3.S
|
|
*
|
|
* Author: Nicolas Pitre
|
|
* Created: Oct 19, 2005
|
|
* Copyright: Monta Vista Software, Inc.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
|
|
#ifdef __ARMEB__
|
|
#define xh r0
|
|
#define xl r1
|
|
#define yh r2
|
|
#define yl r3
|
|
#else
|
|
#define xl r0
|
|
#define xh r1
|
|
#define yl r2
|
|
#define yh r3
|
|
#endif
|
|
|
|
ENTRY(__muldi3)
|
|
|
|
mul xh, yl, xh
|
|
mla xh, xl, yh, xh
|
|
mov ip, xl, asr #16
|
|
mov yh, yl, asr #16
|
|
bic xl, xl, ip, lsl #16
|
|
bic yl, yl, yh, lsl #16
|
|
mla xh, yh, ip, xh
|
|
mul yh, xl, yh
|
|
mul xl, yl, xl
|
|
mul ip, yl, ip
|
|
adds xl, xl, yh, lsl #16
|
|
adc xh, xh, yh, lsr #16
|
|
adds xl, xl, ip, lsl #16
|
|
adc xh, xh, ip, lsr #16
|
|
mov pc, lr
|
|
|