[cfe-dev] [llvm-dev] [FPEnv] Rust/Go/Swift/Flang/other llvm IRBuilder needs?

Than McIntosh via cfe-dev cfe-dev at lists.llvm.org
Thu Jan 17 08:48:24 PST 2019


Hi Kevin,
Same situation for our Go compiler (gollvm). We also use explicit checks
for division by zero, and I can't envision a need to have more fine-grained
control over rounding/exception-mode for fadd etc.
Cheers, Than

On Wed, Jan 16, 2019 at 5:39 PM Philip Reames via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> For us, constrained fadd and friends aren't particular relevant.  We don't
> need to model changes to the floating point environment, and chose to use
> explicit control flow for fault handling (e.g. div-by-zero).  We might
> someday explore using constrained operations for performance reasons, but
> up until now, haven't really had the need to.  So, no opinion, sorry.
>
> Philip
> On 1/16/19 10:02 AM, Kevin Neal via llvm-dev wrote:
>
> I’ve got a ticket open where I would very much like some input from
> maintainers of other languages that rely on llvm and use the IRBuilder. See:
>
> Teach the IRBuilder about constrained fadd and friends:
> *https://reviews.llvm.org/D53157* <https://reviews.llvm.org/D53157>
>
> I’m adding support to functions like CreateFAdd() the ability to
> optionally emit the constrained math intrinsics required to support strict
> floating point mode. This makes the changes in clang relatively easy, but
> the concern is that there may be concerns that haven’t been raised in the
> diff. And I’d like to tailor the interface so that it meets the needs of
> IRBuilder users, but ideally that wants input from actual IRBuilder users.
>
> So, can I get some input from other front end authors and maintainers?
>
> Apologies for the cross posting, but I don’t know how to more precisely
> get the attention of the relevant people.
> --
> Kevin P. Neal
> SAS/C and SAS/C++ Compiler
> Host Research and Development
> SAS Institute, Inc.
>
>
>
>
>
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