[Backport to 16] Reverse translation for SPV_KHR_cooperative_matrix extension #3097
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…ooperative matrixes (KhronosGroup#2166) Implement translation via SPIR-V friendly calls, as: the LLVM instructions are not capable to accept target extension types; matrix arithmetic instructions require additional carry additional rules, which LLVM can not perform (for example while technically Add for vectors and (flattened) matrices is the same - yet for matrices we need to perform extra checks, also mul instruction is complitely different). As for now some BE would need to recognize and define what to do with a call to __spirv_FMul(matrixA, matrixB). Better option is to map such SPIR-V to an intrinsic or define an appropriate type in LLVM (hence defining rules for GEP and other instructions) , but it's off the table now.
…s for cooperative matrix (KhronosGroup#2165) Implement translation via SPIR-V friendly calls, as: the LLVM instructions are not capable to accept target extension types; cooperative matrix is an opaque object and accessing elements is implementation defined, hence we can't use GEP to which AccessChain naturally maps, since GEP has a different meaning. As for now some BE would need to recognize and define what to do with a call to __spirv_AccessChain(matrix, index). Better option is to map such SPIR-V to an intrinsic or define an appropriate type in LLVM (hence defining rules for GEP and other instructions) , but it's off the table now.
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