Function 'cast_bf16_f16' does not exist

[super-fun-surf]

Using the stable-diffusion-3 example on a Mac with metal feature. When I run these lines

    let vb_vae = vb.clone().rename_f(sd3_vae_vb_rename).pp("first_stage_model");
    println!("vb_vae dtype {:?}", vb_vae.dtype());
    let autoencoder = build_sd3_vae_autoencoder(vb_vae)?;
    println!("autoencoder {:?}", autoencoder);

I get the error when it is trying to build the autoencoder

vb_vae dtype F16
creating autoencoder
Error: Metal error Error while loading function: "Function 'cast_bf16_f16' does not exist"

[LaurentMazare]

Probably the same as #2406

[super-fun-surf]

so does that mean its a clang problem and not a candle/metal problem? this one is for f16
not sure how to troubleshoot?

[LaurentMazare]

I doubt that it's related to the f16 part, the most like is the bf16 as this part is detected automatically and fails for older versions of clang (and maybe in other cases?)
The detection is conditioned in the .metal file by the __HAVE_BFLOAT__ variable, googling around you find this issue that got mentioned in the other thread tinygrad/tinygrad#3453 .