[llvm-dev] [GlobalISel][AArch64] Toward flipping the switch for O0: Please give it a try!

Kristof Beyls via llvm-dev llvm-dev at lists.llvm.org
Mon Nov 20 02:56:38 PST 2017

On 17 Nov 2017, at 22:51, Justin Bogner <mail at justinbogner.com<mailto:mail at justinbogner.com>> wrote:

Justin Bogner <mail at justinbogner.com<mailto:mail at justinbogner.com>> writes:
Kristof Beyls via llvm-dev <llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>> writes:
On 13 Nov 2017, at 18:26, Quentin Colombet <qcolombet at apple.com<mailto:qcolombet at apple.com>> wrote:
Hi Kristof,

On Nov 13, 2017, at 9:10 AM, Kristof Beyls <Kristof.Beyls at arm.com<mailto:Kristof.Beyls at arm.com>> wrote:
Hi Quentin,

My only remaining concern is around ABI compatibility.
The following commit seems to indicate that in the previous round of
evaluation, we didn’t find an existing ABI compatibility issue:
I haven’t looked into the details of this issue - so maybe I’m worried
over nothing?

No, you’re right. The problem with ABI is if you are consistently wrong,
then you won’t notice :).

I’m wondering if since then on your side you did any testing around
ABI compatibility?
E.g. building software where you semi-randomly build some functions
through GlobalISel and some functions through DAGISel?

Justin will look into that. Clang has utility script for that utils/

Given we will only be able to check iOS ABI, you may want to follow the
same kind of validation on your side.

Looping back here, I generated and ran 1000000 test cases with the
ABITest utility and hit some fallbacks and an "invalid zero-sized type"
assert that need looking at, but it didn't uncover any ABI issues.

Hi Justin,

I followed the instructions you provided earlier in the thread to get these tests running on linux.
I also had to change the “#!/bin/sh” lines in the script to “#!/bin/bash”, as apparently the shell scripts in there rely on some bash-isms.

I ran 10000 test cases and didn’t find ABI issues in those; but also found the same “invalid zero-size type” assert.
I’ve file a PR at https://bugs.llvm.org/show_bug.cgi?id=35358 for that assert and linked it to the umbrella issue https://bugs.llvm.org/show_bug.cgi?id=35347.


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