[Libre-soc-isa] [Bug 650] write rfc for OpenPower fpr <-> gpr moves/conversions

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=650

--- Comment #27 from Jacob Lifshay <programmerjake at gmail.com> ---
(In reply to Luke Kenneth Casson Leighton from comment #25)
> (In reply to Jacob Lifshay from comment #22)
> > (In reply to Luke Kenneth Casson Leighton from comment #21)
> > > jacob what does rust have to do with java, llvm or SPIR-V? i cannot see the
> > > connection between these 4 languages in the words used in the page.
> > 
> > They all need the fp -> int semantics I labeled "Rust conversion semantics"
> > https://libre-soc.org/openpower/sv/int_fp_mv/#fp-to-int-rust-conversion-
> > semantics
> 
> ok, then that should be spelled out in the paragraph.  can you please add
> that, something like, "all of these languages listed below have the exact
> same conversion behaviour"
> 
> then it is clear.

clarified.

> otherwise it looks like rust is *implemented* in or by llvm, java, and SPIRV.
> 
> see how things have to be absolutely spelled out? no possibility for
> english language ambiguity.

If the section is just explaining why we want instructions, and is not actually
part of the specification of how implementations should or should not behave, I
see no problem with some ambiguity as part of making it short enough to be easy
to read.

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