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This library provides a code-generated SPIR-V compiler for use in OCaml projects.
SpirV operations are specified using label variants (the number of spirv operations exceeds the ocaml type tag size, so a normal type variant won't work). SpirV enumerants are represented as OCaml type variants. For the case of flag types, enumerants are represented as a list of flags. Enumerants that normally specify extended operands wrap the extended operands as a tuple of arguments to the OCaml type constructor. Literal integers are represented with the
int32 type (for
int32 literals, add an
l at the end; e.g.
10l). Literal strings are represented with regular OCaml strings.
When specifying literal values to the
OpConstant instruction, the values are wrapped with the
big_int_or_float type (there is no check against the return type of
OpConstant right now). The default op for a
OpSpecConstantOp instruction is specified using the type
spec_op. The values of
spec_op are the valid
OpSpecConstantOp instructions, except that the result type and result are removed and the
Op prefix is removed (e.g. ```OpSpecConstantOp (type_id, result_id, `IAdd (constant_a, constant_b))``).
Extended instructions are currently implemented through a function abstraction. The extended instruction and it's operands are specified with a function in
OpExtInst which has the type signature
unit -> int32 list. The idea behind this is that extended instructions can be provided through other OCaml libraries which would return the compiled instruction and operands as a list of SpirV words.