[llvm-dev] Problem with clang optimizer?

[Blumenthal, Uri - 0553 - MITLL via llvm-dev]

Also, it seems to impact only MacOS? One colleague wasn’t able to reproduce with Clang-12 on Linux.

This is where this problem was discovered and is tracked, with all the details: 

https://github.com/randombit/botan/issues/2802 

 

If you nail this one, it would be great.

 

Thanks!

--

Regards,

Uri

 

There are two ways to design a system. One is to make is so simple there are obviously no deficiencies.

The other is to make it so complex there are no obvious deficiencies.

                                                                                                                                     -  C. A. R. Hoare

 

 

From: Craig Topper <craig.topper at gmail.com>
Date: Thursday, September 23, 2021 at 23:28
To: Michael Kruse <llvmdev at meinersbur.de>
Cc: Uri Blumenthal <uri at ll.mit.edu>, LLVM-DEV LIST <llvm-dev at lists.llvm.org>
Subject: Re: [llvm-dev] Problem with clang optimizer?

 

opt-bisect points to SLP vectorizer. And it looks like it doesn't fail on trunk.

 

~Craig

 

 

On Thu, Sep 23, 2021 at 7:39 PM Michael Kruse via llvm-dev <llvm-dev at lists.llvm.org> wrote:

Reproducer: https://godbolt.org/z/f6nxnG3sY
(cstddef and -march must be added as well)

Michael
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