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

[Alex L via llvm-commits]

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/Contents/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
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