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Re: [RFC PATCH] tests/tcg: drop -cpu max from s390x sha512-mvx invocatio

From: Thomas Huth
Subject: Re: [RFC PATCH] tests/tcg: drop -cpu max from s390x sha512-mvx invocation
Date: Thu, 10 Mar 2022 13:28:19 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.6.0

On 10/03/2022 12.35, Richard Henderson wrote:
On 3/10/22 02:21, Thomas Huth wrote:
On 10/03/2022 09.36, Thomas Huth wrote:
However, the error still persists. I now had a closer look by running the test with "qemu-s390x" on my z15 machine directly, and all tests are failing! The problem happens with both, gcc v11.2.1 and clang v13.0.1. The problem goes away (i.e. test works fine) if I compile the code with -O1 instead of -O3, or if I use GCC v8.5 instead. I'll try to find out more, but as a temporary workaround, we could also switch to -O1 instead of -O3.

I noticed that the problem does not occur when running the test natively
on my s390x box, or via qemu-s390x on my x86 laptop, or when running it
via qemu-s390x v6.1.0 on my s390x box. So it's something wrong in the TCG
backend, I think, and I was able to bisect the issue down to this commit

$ git bisect bad
9bca986df88b8ea46b100e3d21cc9e653c83e0b3 is the first bad commit
commit 9bca986df88b8ea46b100e3d21cc9e653c83e0b3
Author: Richard Henderson <richard.henderson@linaro.org>
Date:   Mon Sep 14 20:36:36 2020 -0700

     tcg/s390x: Implement TCG_TARGET_HAS_bitsel_vec

Richard, could you please have a look?
[...]> Ok, will look soon.
Would you pop this into an issue so I don't forget, please?

Sure, I've created a ticket here:



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