[PATCH] D72906: [X86] Improve X86 cmpps/cmppd/cmpss/cmpsd intrinsics with strictfp

Fri Jan 17 09:35:43 PST 2020

uweigand added a comment.

In D72906#1826122 <https://reviews.llvm.org/D72906#1826122>, @craig.topper wrote:

> In D72906#1826061 <https://reviews.llvm.org/D72906#1826061>, @uweigand wrote:
>
> > > The constrained fcmp intrinsics don't allow the TRUE/FALSE predicates.
> >
> > Hmm, maybe they should then?   The only reason I didn't add them initially was that I wasn't sure they were useful for anything; if they are, it should be straightforward to add them back.
>
>
> What would we lower it to on a target that doesn’t support it natively?

Any supported compare (quiet or signaling as appropriate, just so we get the correct exceptions), and then ignore the result (and use true/false constant result instead)?

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https://reviews.llvm.org/D72906