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[Bug target/81763] Issues with BMI on 32bit x86 apps on GCC 7.1+
- From: "hjl.tools at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 09 Aug 2017 02:03:33 +0000
- Subject: [Bug target/81763] Issues with BMI on 32bit x86 apps on GCC 7.1+
- Auto-submitted: auto-generated
- References: <bug-81763-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81763
--- Comment #7 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Mike Lothian from comment #6)
> I tried the test case with
>
> gcc -O2 -march=native test.c -o test
>
> and
>
> gcc -O2 -march=native -mno-bmi test.c -o test
>
> Both executables seem to run with no output
>
> I've only seen the issue in radeonsi in Mesa with LLVM, I'm not sure what's
> happening as the problem doesn't manifest when debugging is enabled so I'm
> not sure how to create a smaller test case
Compile radeonsi one function at a time with and without -mbmi to
find out the smallest function which causes the problem with -mbmi.
If the function is small enough, we can take a guess.