linux-kernel - Re: [PATCH v7 2/2] tty: add rpmsg driver

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Message-ID: <f97d9dc54178e4344512bc7986265f101f4639c6.camel@perches.com>
Date:   Wed, 25 Mar 2020 17:01:57 -0700
From:   Joe Perches <joe@...ches.com>
To:     Jiri Slaby <jslaby@...e.cz>,
        Arnaud POULIQUEN <arnaud.pouliquen@...com>,
        Ohad Ben-Cohen <ohad@...ery.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, linux-remoteproc@...r.kernel.org,
        Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:     Suman Anna <s-anna@...com>,
        Fabien DESSENNE <fabien.dessenne@...com>,
        linux-stm32@...md-mailman.stormreply.com,
        xiang xiao <xiaoxiang781216@...il.com>
Subject: Re: [PATCH v7 2/2] tty: add rpmsg driver

On Wed, 2020-03-25 at 14:31 +0100, Jiri Slaby wrote:
> The question was exactly about that: can a compiler optimize it to a
> bare number or will strlen call remain there?

$ cat str.c
#include <string.h>

int foo(void)
{
	return strlen("abc");
}

$ gcc -c -O2 str.c
$ objdump -d str.o
str.o:     file format elf64-x86-64


Disassembly of section .text:

0000000000000000 <foo>:
   0:	f3 0f 1e fa          	endbr64 
   4:	b8 03 00 00 00       	mov    $0x3,%eax
   9:	c3                   	retq