[llvm] r310510 - [SimplifyCFG] remove checks for crasher test from r310481

[Sanjay Patel via llvm-commits]

FWIW, my local machine has:
$  clang -v
Apple LLVM version 8.1.0 (clang-802.0.42)
Target: x86_64-apple-darwin16.7.0

But if we look at some of the bot fails, there doesn't seem to be a
connection to macOS. These failed *after* r310492 (so likely passed with
the earlier version of the test):
1. http://lab.llvm.org:8011/builders/clang-cmake-armv7-
a15-selfhost-neon/builds/1823
2. http://lab.llvm.org:8011/builders/llvm-mips-linux/builds/2187



On Thu, Aug 10, 2017 at 5:25 AM, Alex L <arphaman at gmail.com> wrote:

> Also reproduces locally with clang-900.0.27. Doesn't look like a
> miscompile.
>
> On 10 August 2017 at 12:15, Alex L <arphaman at gmail.com> wrote:
>
>> Our bot used clang-800.0.42.1 and had the same IR as Sanjay.
>>
>> On 10 August 2017 at 11:57, Davide Italiano via llvm-commits <
>> llvm-commits at lists.llvm.org> wrote:
>>
>>> On Thu, Aug 10, 2017 at 12:43 AM, Davide Italiano <davide at freebsd.org>
>>> wrote:
>>> > On Wed, Aug 9, 2017 at 12:42 PM, Sanjay Patel <spatel at rotateright.com>
>>> wrote:
>>> >> The IR difference is real - it seems to depend on whether you're
>>> building
>>> >> debug or release.
>>> >>
>>> >> This didn't change if I specified triple+layout with:
>>> >> target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
>>> >> target triple = "x86_64-unknown-linux-gnu"
>>> >>
>>> >> Here's what I show using a debug build of opt on x86-64 on macOS
>>> (note:
>>> >> different blocks, different phi, etc):
>>> >
>>> > While I think this is unrelated to the change, it's an annoying piece
>>> > of non-determinism.
>>> > I'll try to shed some light on it today.
>>> >
>>> > Thanks,
>>> >
>>>
>>> I'm finally able to reproduce this.
>>> It reproduces only on MacOS (not on Linux nor Windows), when building
>>> trunk (debug/release) with the following compiler:
>>>
>>> $ clang --version
>>> Apple LLVM version 7.3.0 (clang-703.0.31)
>>> Target: x86_64-apple-darwin15.4.0
>>> Thread model: posix
>>> InstalledDir: /Applications/Xcode.app/Conten
>>> ts/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
>>>
>>> Does this match the version you have? I'll consider building with a
>>> different compiler on Mac (e.g. GCC) because this could possibly be a
>>> miscompile introduced by the LLVM clang shipped by Apple.
>>>
>>> Thanks,
>>>
>>> --
>>> Davide
>>> _______________________________________________
>>> llvm-commits mailing list
>>> llvm-commits at lists.llvm.org
>>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-commits
>>>
>>
>>
>
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