llvm dev - May 2020 - [MachineScheduler] -misched-cutoff option seems broken

Hi,

as reported at https://bugs.llvm.org/show_bug.cgi?id=45928, the 
-misched-cutoff option is old and apparently not working correctly when 
used (causes compilation crashes).

As discussed on Bugzilla, if no one is using this perhaps it should be 
removed?

/Jonas

Hi Jonas:

I personally think this is a handy feature, and never meet problem with
PowerPC target.
Maybe we shouldn't remove a feature just due to some bug (or even bug else
exposed by it?)

From the description in bug report, looks like memory corruption issue?
Is it possible that it is due to target implementation?
eg: how SystemZ implement the target hooks, like pickNode etc.


Best,

Jinsong Ji (纪金松), PhD.

XL/LLVM on Power Compiler Development
E-mail: jji at us.ibm.com



From:	Jonas Paulsson via llvm-dev <llvm-dev at lists.llvm.org>
To:	llvm-dev <llvm-dev at lists.llvm.org>
Date:	05/22/2020 03:23 AM
Subject:	[EXTERNAL] [llvm-dev] [MachineScheduler] -misched-cutoff option
            seems broken
Sent by:	"llvm-dev" <llvm-dev-bounces at lists.llvm.org>



Hi,

as reported at
https://urldefense.proofpoint.com/v2/url?u=https-3A__bugs.llvm.org_show-5Fbug.cgi-3Fid-3D45928&d=DwIGaQ&c=jf_iaSHvJObTbx-siA1ZOg&r=DvnnfavFQBGT2CDyHzTr_Q&m=NTzPfe8XGjyHXGJ5UAGR83Fy966eVhbfy41xamuda3A&s=dwZVfRRJg0m6CetGse236f7i1bA7z2YfIoxxiIX0n6s&e
, the
-misched-cutoff option is old and apparently not working correctly when
used (causes compilation crashes).

As discussed on Bugzilla, if no one is using this perhaps it should be
removed?

/Jonas


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