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
here:
$ git bisect bad
9bca986df88b8ea46b100e3d21cc9e653c83e0b3 is the first bad commit
commit 9bca986df88b8ea46b100e3d21cc9e653c83e0b3
Author: Richard Henderson <[email protected]>
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:
https://gitlab.com/qemu-project/qemu/-/issues/898
Thomas
