Jonathan Brouwer
cccf996225
Add autocast support for `x86amx` Builds on rust-lang/rust#140763 by further adding autocasts for `x86amx` from/to vectors of size 8192 bits. This also disables SIMD vector abi checks for the `"unadjusted"` abi because - This is primarily used to link with LLVM intrinsics, which don't actually lower to function calls with vector arguments. Even with other cg backends, this is true. - This ABI is internal and perma-unstable (and also super specific), so it is very unlikely that this will cause breakages. - (The primary reason) Without doing this we can't actually use 8192 bit long vectors to represent `x86amx` > Why do we need a bypass for `x86amx`? Can't we use a `#[lang_item]` or something? If `x86amx` was a normal LLVM type, this approach would've worked and I would also prefer it. But LLVM specifies that > No instruction is allowed for this type. There are no arguments, arrays, pointers, vectors or constants of this type. So we can't treat it like a normal type at all -- even if we add it like a lang-item, we would still have to special-case everywhere to check if we are passing to the correct LLVM intrinsic, and only then use the `x86amx` type. IMO this is needlessly complex, and way worse than this solution, which just adds it to the autocast list in cg_llvm r? codegen
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