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From: =?gb18030?B?ODQ3NTY3MTYx?= <847567161@qq.com>
To: =?gb18030?B?bXVzbA==?= <musl@lists.openwall.com>
Subject: [musl] =?gb18030?B?UmU6UmU6IFJlOiBbbXVzbF0gUXVlc3Rpb26juldoeSBtdXNsIGNhbGwgYV9iYXJyaWVyIGluIF9fcHRocmVhZF9vbmNlPw==?=
Date: Mon, 22 May 2023 09:53:05 +0800	[thread overview]
Message-ID: <tencent_38BCF80DB338A46040E1ECE710B8D1F8E507@qq.com> (raw)

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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

             reply	other threads:[~2023-05-22  1:53 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-05-22  1:53 =?gb18030?B?ODQ3NTY3MTYx?= [this message]
2023-05-23 19:41 ` [musl] Re:Re: Re: [musl] Question：Why musl call a_barrier in __pthread_once? Szabolcs Nagy
  -- strict thread matches above, loose matches on Subject: below --
2023-05-18 14:37 [musl] =?gb18030?B?UmU6UmU6IFJlOiBbbXVzbF0gUXVlc3Rpb26juldoeSBtdXNsIGNhbGwgYV9iYXJyaWVyIGluIF9fcHRocmVhZF9vbmNlPw==?= =?gb18030?B?ODQ3NTY3MTYx?=

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