From: Richard Henderson <rth@twiddle.net>
To: Nathan Froyd <froydnj@codesourcery.com>
Cc: qemu-devel@nongnu.org, aurelien@aurel32.net
Subject: Re: [Qemu-devel] [PATCH 09/10] target-alpha: Implement load-locked/store-conditional properly.
Date: Thu, 25 Mar 2010 09:29:18 -0700 [thread overview]
Message-ID: <4BAB8F5E.2020508@twiddle.net> (raw)
In-Reply-To: <20100325160611.GU16726@codesourcery.com>
On 03/25/2010 09:06 AM, Nathan Froyd wrote:
>> Mips doesn't even pretend to be atomic.
>
> It pretends just as much as ppc and arm. See translate.c:OP_ST_ATOMIC.
No it doesn't. Look at HELPER_ST_ATOMIC:
tmp = do_##ld_insn(arg2, mem_idx); \
if (tmp == env->llval) { \
do_##st_insn(arg2, arg1, mem_idx); \
return 1; \
> (The remaining cases are tricky things, like cross-process locks.) I
> think--though Paul would remember better than I--that the stop-the-world
> approach might have been taken due to a desire to continue compiling
> with gcc < 4.1. I don't know how much of a desdirata that still is.
Even that wouldn't be an issue if we move the cmpxchg into TCG.
I'll put this at the end of the enhancement queue...
r~
next prev parent reply other threads:[~2010-03-25 16:29 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-25 0:24 [Qemu-devel] [PATCH 00/10, v3] target-alpha improvements Richard Henderson
2010-03-12 18:31 ` [Qemu-devel] [PATCH 01/10] target-alpha: Add flags markups to helpers.h Richard Henderson
2010-03-12 19:22 ` [Qemu-devel] [PATCH 02/10] target-alpha: Implement cpys{, n, e} inline Richard Henderson
2010-03-15 14:49 ` [Qemu-devel] [PATCH 03/10] target-alpha: Implement rs/rc properly Richard Henderson
2010-03-15 15:38 ` [Qemu-devel] [PATCH 05/10] target-alpha: Implement cvtlq inline Richard Henderson
2010-03-16 20:04 ` [Qemu-devel] [PATCH 06/10] target-alpha: Use setcond for int comparisons Richard Henderson
2010-03-16 21:44 ` [Qemu-devel] [PATCH 07/10] target-alpha: Use non-inverted arguments to gen_{f}cmov Richard Henderson
2010-03-16 22:10 ` [Qemu-devel] [PATCH 08/10] target-alpha: Emit goto_tb opcodes Richard Henderson
2010-03-19 22:55 ` [Qemu-devel] [PATCH 04/10] target-alpha: Implement cvtql inline Richard Henderson
2010-03-25 0:11 ` [Qemu-devel] [PATCH 09/10] target-alpha: Implement load-locked/store-conditional properly Richard Henderson
2010-03-25 13:39 ` Nathan Froyd
2010-03-25 15:46 ` Richard Henderson
2010-03-25 16:06 ` Nathan Froyd
2010-03-25 16:29 ` Richard Henderson [this message]
2010-03-25 16:42 ` Nathan Froyd
2010-03-25 16:50 ` Richard Henderson
2010-03-25 17:40 ` Blue Swirl
2010-03-25 18:19 ` Richard Henderson
2010-03-26 1:55 ` Jamie Lokier
2010-03-26 2:01 ` Jamie Lokier
2010-03-25 0:13 ` [Qemu-devel] [PATCH 10/10] target-alpha: Enable NPTL Richard Henderson
2010-03-26 1:52 ` [Qemu-devel] [PATCH 00/10, v3] target-alpha improvements Jamie Lokier
2010-03-26 13:37 ` Richard Henderson
2010-04-01 13:44 ` Paul Brook
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