[LLVMdev] [cfe-dev] computing a conservatively rounded square of a double

[Geoffrey Irving]

It would be wonderful to get this in!  What would the front-end
interface be (-frounding-math, #pragma, special builtins, etc.)?

Geoffrey

On Thu, Mar 27, 2014 at 9:18 AM, Philip Reames
<listmail at philipreames.com> wrote:
> Paul,
>
> If any of those llvm changes are still pending, let me know.  I'd be happy
> to review.
>
> Philip
>
>
> On 03/27/2014 08:46 AM, Robinson, Paul wrote:
>
> While I did propose a patch to add this attribute to Clang, and it was
> approved, I never committed it because the LLVM work to fully support it has
> been dangling in nobody-wants-to-review-it limbo forever.  And it seemed
> like I shouldn't put the attribute into Clang if LLVM didn't fully honor the
> contract.
>
>
>
> I'll redo the Clang part (Aaron Ballman has refactored the
> attribute-handling stuff about a hundred times since I did the original
> patch so it no longer applies) and hopefully get that into Clang soon.
>
> Thanks,
>
> --paulr
>
>
>
> Geoffrey - In the short term, if you marked this function as
> "__attribute__((optnone))", that might have the effect you desire.  See
> http://clang-developers.42468.n3.nabble.com/RFC-add-Function-Attribute-to-disable-optimization-td4032641.html
>
>
>