mirror of
https://github.com/ARM-software/arm-trusted-firmware.git
synced 2025-04-18 10:34:19 +00:00
34d7f196b4
When conditions are right, eg a small memcpy of a known size and alignment, the compiler may know of a sequence that is optimal for the given constraints and inline it. If the compiler doesn't find one, it will emit a call to the generic function (in the libc) which will implement this in the most generic and unconstrained manner. That generic function is rarely the most optimal when constraints are known. So give the compiler a chance to do this. Replace calls to libc functions that have builtins to the builtin and keep the generic implementation if it decides to emit a call anyway. And example of this in action is usage of FEAT_MOPS. When the compiler is aware of the feature (-march=armv8.8-a) then it will emit the 3 MOPS instructions instead of calls to our memcpy() and memset() implementations. Change-Id: I9860cfada1d941b613ebd4da068e9992c387952e Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
52 lines
2 KiB
C
52 lines
2 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-3-Clause
|
|
*
|
|
* Copyright (c) 1990, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Chris Torek.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
/*
|
|
* Portions copyright (c) 2018-2025, Arm Limited and Contributors.
|
|
* All rights reserved.
|
|
*/
|
|
|
|
#include <string_private.h>
|
|
|
|
/*
|
|
* Compare strings.
|
|
*/
|
|
int
|
|
strcmp(const char *s1, const char *s2)
|
|
{
|
|
while (*s1 == *s2++)
|
|
if (*s1++ == '\0')
|
|
return (0);
|
|
return (*(const unsigned char *)s1 - *(const unsigned char *)(s2 - 1));
|
|
}
|