Support `f16` and `f128`

[tgross35]

As of rust-lang/rust#121728, the backends now have stubs for f16 and f128: https://github.com/rust-lang/rust/blob/6cbf0926d54c80ea6d15df333be9281f65bbeb36/compiler/rustc_codegen_gcc/src/type_.rs#L123-L137.

It will be a while before these codepaths can even be exercised since the frontend isn't hooked up yet, (frontend is done now) but at some point this should be changed to either gracefully fail or do the right thing.

[tgross35]

Hey @zedar I saw you did rust-lang/gcc#47 and rust-lang/gccjit.rs#33 for this. Is anything else needed in the GCC backend, or do the unimplemented!s at

rustc_codegen_gcc/src/type_.rs

Lines 123 to 137 in a63b83e

	fn type_f16(&self) -> Type<'gcc> {
	unimplemented!("f16_f128")
	}
	fn type_f32(&self) -> Type<'gcc> {
	self.float_type
	}
	fn type_f64(&self) -> Type<'gcc> {
	self.double_type
	}
	fn type_f128(&self) -> Type<'gcc> {
	unimplemented!("f16_f128")
	}

just need to be updated?

[antoyo]

The support was merged recently (those were updated and are not unimplemented!() anymore).
It might require a sync for it to work properly, but the current sync is very difficult to do, so it will take more time before it's ready.

[tgross35]

Oh I see they were done in antoyo#17, awesome!

I don't have any need for it, just been chasing down the f16_f128 FIXMEs and unimplemented!s.

[tgross35]

(chances are you know this already, but Miri is using https://github.com/josh-project/josh for supposedly easier syncs, I think Clippy is looking to switch to it too)

[tgross35]

I think this has been synced in by now right? A simple example seems to work https://godbolt.org/z/GqWvrza5e.

Many thanks for making this happen!