From: Laurent Vivier <laurent@vivier.eu>
To: Richard Henderson <richard.henderson@linaro.org>, qemu-devel@nongnu.org
Cc: peter.maydell@linaro.org, qemu-stable@nongnu.org
Subject: Re: [Qemu-devel] [PATCH] tcg: Limit the number of ops in a TB
Date: Tue, 8 May 2018 23:06:51 +0200 [thread overview]
Message-ID: <03ab4fb3-b49c-b9e4-f171-7a5efa723473@vivier.eu> (raw)
In-Reply-To: <20180508193645.3960-1-richard.henderson@linaro.org>
Le 08/05/2018 à 21:36, Richard Henderson a écrit :
> In 6001f7729e12 we partially attempt to address the branch
> displacement overflow caused by 15fa08f845.
>
> However, gcc/testsuite/gcc.target/aarch64/advsimd-intrinsics/vqtbX.c
> is a testcase that contains a TB so large as to overflow anyway.
> The limit here of 8000 ops produces a maximum output TB size of
> 24112 bytes on a ppc64le host with that test case. This is still
> much less than the maximum forward branch distance of 32764 bytes.
>
> Cc: qemu-stable@nongnu.org
> Fixes: 15fa08f845 ("tcg: Dynamically allocate TCGOps")
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> ---
> tcg/tcg.h | 8 +++++++-
> tcg/tcg.c | 3 +++
> 2 files changed, 10 insertions(+), 1 deletion(-)
>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
next prev parent reply other threads:[~2018-05-08 21:07 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-08 19:36 [Qemu-devel] [PATCH] tcg: Limit the number of ops in a TB Richard Henderson
2018-05-08 21:06 ` Laurent Vivier [this message]
2018-05-08 22:46 ` Philippe Mathieu-Daudé
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