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Message-ID: <alpine.LNX.2.20.1601102044510.32597@monopod.intra.ispras.ru>
Date: Sun, 10 Jan 2016 20:50:28 +0300 (MSK)
From: Alexander Monakov <amonakov@...ras.ru>
To: musl@...ts.openwall.com
Subject: Re: atomic.h cleanup
On Sun, 10 Jan 2016, Markus Wichmann wrote:
> | static inline int a_sc(volatile int* p, int x)
> | {
> | __asm__ goto ("stwcx. %0, 0, %1\n\tbne- %l2" : : "r"(x), "r"(p) : "cc", "memory" : fail);
> | return 1;
> | fail:
> | return 0;
> | }
>
> I tested the assembler output from both gcc and clang and it looks
> alright to me (testcase attached).
"asm goto" is an extension that appeared in gcc 4.5 and is not supported in
clang (I get "error: expected '(' after 'asm'" with clang 3.7). I don't know
why you claim it works with clang.
Corresponding llvm bugs (no plans to add support soon):
https://llvm.org/bugs/show_bug.cgi?id=9295
https://llvm.org/bugs/show_bug.cgi?id=14406
Alexander
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