[Qemu-devel] [Bug 1834496] Re: Regressions on arm target with some GCC tests

[Alex Bennée]

I bisected a chunk of the errors to:

  commit c6fb8c0cf704c4a1a48c3e99e995ad4c58150dab (refs/bisect/bad)
  Author: Richard Henderson <address@hidden>
  Date:   Mon Feb 25 11:42:35 2019 -0800

      tcg/i386: Support INDEX_op_extract2_{i32,i64}

      Signed-off-by: Richard Henderson <address@hidden>

Specifically I think when tcg_gen_deposit_i32 handles the if (ofs + len
== 32) case.

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https://bugs.launchpad.net/bugs/1834496

Title:
  Regressions on arm target with some GCC tests

Status in QEMU:
  New

Bug description:
  Hi,

  After trying qemu master:
  commit 474f3938d79ab36b9231c9ad3b5a9314c2aeacde
  Merge: 68d7ff0 14f5d87
  Author: Peter Maydell <address@hidden>
  Date:   Fri Jun 21 15:40:50 2019 +0100

  I found several regressions compared to qemu-3.1 when running the GCC 
testsuite.
  I'm attaching a tarball containing several GCC tests (binaries), needed 
shared libs, and a short script to run all the tests.

  All tests used to pass w/o error (one of them is verbose), but with a
  recent qemu, all of them make qemu crash:

  qemu: uncaught target signal 6 (Aborted) - core dumped

  This was noticed with GCC master configured with
  --target arm-none-linux-gnueabi
  --with-mode arm
  --with-cpu cortex-a9

  and calling qemu with --cpu cortex-a9 (the script uses "any", this
  makes no difference).

  I have noticed other failures with arm-v8 code, but this is probably
  the same root cause. Since it's a bit tedious to manually rebuild &
  extract the testcases, I'd prefer to start with this subset, and I can
  extract more if needed later.

  Thanks

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