[llvm-dev] [cfe-dev] Speculative FP operation.

[John Brawn via llvm-dev]

I'm currently working on AArch64 strict fp support (which is what's needed to enable -ftrapping-math).
There's a few patches currently in review:
https://reviews.llvm.org/D114946
https://reviews.llvm.org/D115352 (though I need to rebase this)
https://reviews.llvm.org/D115620 (needs some extra work to enable a currently xfailed test)

And I'm working on some other patches:
Miscellaneous fixes for vector instruction lowering
Model FPCR use in AArch64 instructions
Fixes related to GlobalISel (not strictly needed as GlobalISel falls back to default isel when it can't handle things)

Once all of the above is done I think that I can then mark AArch64 as supporting strict fp in clang, so that -ftrapping-math isn't ignored.

John

________________________________
From: cfe-dev <cfe-dev-bounces at lists.llvm.org> on behalf of Florian Hahn via cfe-dev <cfe-dev at lists.llvm.org>
Sent: 12 January 2022 15:16
To: Umesh Kalappa <umesh.kalappa0 at gmail.com>; cfe-dev <cfe-dev at lists.llvm.org>
Cc: Kaylor, Andrew via llvm-dev <llvm-dev at lists.llvm.org>; Blower, Melanie I via cfe-dev <cfe-dev at lists.llvm.org>
Subject: Re: [cfe-dev] [llvm-dev] Speculative FP operation.

Hi,

> On Jan 12, 2022, at 04:50, Umesh Kalappa via llvm-dev <llvm-dev at lists.llvm.org> wrote:
>
> Hi All,
>
> Did someone tried enabling the trapping math for the aarch64 arch ?
> So that we can surpass the transformation  like below.
>

As far as I know, initial trapping math support only existing for X86 at the moment.

> If not ,we would like to take it up for ARM arch.


I am not aware of anybody working on trapping math for AArch64, so any work in this area could be very valuable. I am CC’ing a couple of people who might know more about the current state of trapping math in Clang.

Cheers,
Florian
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