A spec is all PNaCl needed? It wasn’t a *formal* spec, but it had one. It could have been made extremely good. I doubt they would have sufficed. NaCl had a pretty simple spec too: the validator was *trivial*. I don’t think a spec is sufficient.
I think a difference is that a design goal of SPIR-V was for it to be a distribution format for shaders for native apps, while LLVM IR was designed as an internal compiler IR.
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That’s unrelated to PNaCl though, since it had its own IR (sure, derived from llvm, but different in substantial ways).
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Well, “derived from LLVM” is the relevant part. If it had its own IR, and used the Web APIs over Pepper, it would be a different story. (It’d be wasm, basically) :) TBH, I think Pepper was the larger concern.
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