[clang] [Hexagon] Use __HVX_IEEE_FP__ to guard protos that need -mhvx-ieee-fp (PR #184422)

[Ankit Aggarwal via cfe-commits]

aankit-ca wrote:

> > @quic-akaryaki clang/lib/Basic/Targets/Hexagon.cpp suggests that supported architectures are:
> > V5, V55, V60, V62, V65, V66, V67, V67t, V68, V69, V71, V71t, V73, V75, V79, V81
> > I'm fine removing the comments from the closing guards though.
> 
> **HVX_ARCH** cannot be less than 60, though? This condition is always true.

Okay, you are right. They guard is on the hvx version which should be defined only on v60+.

> > > @quic-akaryaki clang/lib/Basic/Targets/Hexagon.cpp suggests that supported architectures are:
> > > V5, V55, V60, V62, V65, V66, V67, V67t, V68, V69, V71, V71t, V73, V75, V79, V81
> > > I'm fine removing the comments from the closing guards though.
> > 
> > 
> > **HVX_ARCH** cannot be less than 60, though? This condition is always true.
> 
> Even if -mno-hvx?
> 
> Is there another guard covering that? This file gets directly included sometimes IIRC.

Yes, there is a __HVX___ guard at the top of the file. With -mno-hvx __HVX__ would be false.

https://github.com/llvm/llvm-project/pull/184422