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Message-ID: <tencent_38BCF80DB338A46040E1ECE710B8D1F8E507@qq.com>
Date: Mon, 22 May 2023 09:53:05 +0800
From: "847567161" <847567161@...com>
To: "musl" <musl@...ts.openwall.com>
Subject: Re:Re: Re: Question：Why musl call a_barrier in __pthread_once?

Hi

&gt;Besides it doesn't help your case. You wanted to remove the "dmb"
&gt;instruction right? Well, that code adds it if the compiler thinks it is
&gt;necessary, and GCC trunk for ARM does so: https://godbolt.org/z/WcrfTdTx5

I compared the implement between musl and bionic in assembly code, 
I see bionic don't generate 'dmb' with clang, you can also check in here,
https://godbolt.org/z/hroY3cc4d
So it has better performance in comman case which init function is done.

So can we do any optimization here? 

Chuang Yin

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