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module Ir = Ir
module Dtype = Ir.Dtype
module Var = Ir.Var
module Backend_intf = Backend_intf
type 'a kernel_artifact = {
spec_name : string;
compiled : 'a;
arg_order : Var.t list;
}
type 'a exe_internal = {
kernels : 'a kernel_artifact list;
graph_meta : (Var.t, Ir.var_metadata) Hashtbl.t;
graph_outputs : Var.t list;
}
type 'a executable = Executable of 'a exe_internal
let rec result_fold_left f init = function
| [] -> Ok init
| x :: xs ->
let ( let* ) = Result.bind in
let* acc = f init x in
result_fold_left f acc xs
let schedule = Scheduler.schedule
let lower ~kernel_spec ~original_graph_vars_metadata =
Lowerer.lower_kernel ~kernel_spec ~original_graph_vars_metadata
let compile (type callable_kernel_native)
~(backend :
(module Backend_intf.S
with type callable_kernel_native = callable_kernel_native))
(graph : Ir.graph_t) =
let ( let* ) = Result.bind in
let module B =
(val backend
: Backend_intf.S
with type callable_kernel_native = callable_kernel_native)
in
let specs = Scheduler.schedule graph in
let dev = B.Device_info.get_default () in
let opts = B.Compiler.default_options dev in
let compile_kernel (spec : Scheduler.kernel_spec_t) =
let* lowered =
Lowerer.lower_kernel ~kernel_spec:spec
~original_graph_vars_metadata:graph.vars_metadata
in
let src =
B.Renderer.render ~device_info:dev ~lowered_ir:lowered
~kernel_name:spec.name
in
let* art =
B.Compiler.compile ~device_info:dev ~source_code:src ~options:opts
in
let* kern = B.Runtime.get_kernel ~artifact:art ~kernel_name:spec.name in
Ok
{
spec_name = spec.name;
compiled = kern;
arg_order = spec.inputs @ spec.outputs;
}
in
let* kernels =
result_fold_left
(fun acc spec ->
let* k = compile_kernel spec in
Ok (k :: acc))
[] specs
in
Ok
(Executable
{
kernels = List.rev kernels;
graph_meta = graph.vars_metadata;
graph_outputs = graph.output_vars;
})
let execute (type device_buffer_native callable_kernel_native)
~(backend :
(module Backend_intf.S
with type device_buffer_native = device_buffer_native
and type callable_kernel_native = callable_kernel_native))
(Executable exe) ~inputs ~(outputs : Var.t list) =
let ( let* ) = Result.bind in
let module B = (val backend) in
let dev = B.Device_info.get_default () in
let live = Hashtbl.copy inputs in
let ensure_output v =
if Hashtbl.mem live v then Ok ()
else
match Hashtbl.find_opt exe.graph_meta v with
| None -> Error ("Missing metadata for " ^ Var.to_string v)
| Some { dtype = Dtype.Any_Dtype dt; shape; _ } ->
let bytes = Array.fold_left ( * ) 1 shape * Dtype.sizeof_elt dt in
let* buf =
B.Runtime.allocate_buffer ~device_info:dev ~size_in_bytes:bytes
~dtype:dt
in
Hashtbl.add live v (Backend_intf.Any_Device_Buffer buf);
Ok ()
in
let* () = result_fold_left (fun () v -> ensure_output v) () outputs in
let buffer_for v =
match Hashtbl.find_opt live v with
| Some b -> Ok b
| None -> Error ("No buffer for " ^ Var.to_string v)
in
let launch k =
let* args =
result_fold_left
(fun acc hl ->
let* b = buffer_for hl in
Ok (b :: acc))
[] k.arg_order
in
B.Runtime.launch_kernel ~device_info:dev ~global_dims:[| 128; 1; 1 |]
?local_dims:None ~args:(List.rev args) k.compiled
in
let* () = result_fold_left (fun () k -> launch k) () exe.kernels in
let result_tbl = Hashtbl.create (List.length outputs) in
List.iter
(fun v ->
Option.iter
(fun b -> Hashtbl.add result_tbl v b)
(Hashtbl.find_opt live v))
outputs;
Ok result_tbl
let allocate_buffer (type device_buffer_native)
~(backend :
(module Backend_intf.S
with type device_buffer_native = device_buffer_native)) ~size_in_bytes
~(dtype : 'a Dtype.t) =
let module B = (val backend) in
let device_info = B.Device_info.get_default () in
B.Runtime.allocate_buffer ~device_info ~size_in_bytes ~dtype
let copy_to_device (type device_buffer_native)
~(backend :
(module Backend_intf.S
with type device_buffer_native = device_buffer_native)) ~dest_buffer
~host =
let module B = (val backend) in
let bytes = Bigarray.Array1.size_in_bytes host in
if bytes = 0 then Ok ()
else
let ptr =
Ctypes.(raw_address_of_ptr (to_voidp (bigarray_start array1 host)))
in
B.Runtime.copy_to_device ~dest_buffer ~host_data:ptr
~host_data_offset_bytes:0 ~copy_size_bytes:bytes
let copy_from_device (type device_buffer_native)
~(backend :
(module Backend_intf.S
with type device_buffer_native = device_buffer_native)) ~src_buffer
~dest =
let module B = (val backend) in
let bytes = Bigarray.Array1.size_in_bytes dest in
if bytes = 0 then Ok ()
else
let ptr =
Ctypes.(raw_address_of_ptr (to_voidp (bigarray_start array1 dest)))
in
B.Runtime.copy_from_device ~src_buffer ~host_dest_ptr:ptr
~device_data_offset_bytes:0 ~copy_size_bytes:bytes
module Debug = struct
let schedule = schedule
let lower_kernel ~kernel_spec ~original_graph_vars_metadata =
lower ~kernel_spec ~original_graph_vars_metadata
end