diff options
Diffstat (limited to '')
| -rw-r--r-- | compiler/PureMicroPasses.ml | 36 |
1 files changed, 33 insertions, 3 deletions
diff --git a/compiler/PureMicroPasses.ml b/compiler/PureMicroPasses.ml index 156fba29..67495ab5 100644 --- a/compiler/PureMicroPasses.ml +++ b/compiler/PureMicroPasses.ml @@ -674,6 +674,16 @@ let intro_struct_updates (ctx : trans_ctx) (def : fun_decl) : fun_decl = let x := y ... ]} + + Simplify tuples: + {[ + let (y0, y1) := (x0, x1) in + ... + ~~> + let y0 = x0 in + let y1 = x1 in + ... + ]} *) let simplify_let_bindings (_ctx : trans_ctx) (def : fun_decl) : fun_decl = let obj = @@ -705,10 +715,30 @@ let simplify_let_bindings (_ctx : trans_ctx) (def : fun_decl) : fun_decl = x ) -> (* return/fail case *) if variant_id = result_return_id then - (* Return case *) - super#visit_Let env false lv x next - else if variant_id = result_fail_id then (* Fail case *) rv.e + (* Return case - note that the simplification we just perform + might have unlocked the tuple simplification below *) + self#visit_Let env false lv x next + else if variant_id = result_fail_id then + (* Fail case *) + self#visit_expression env rv.e else raise (Failure "Unexpected") + | App _ -> + (* This might be the tuple case *) + if not monadic then + match + (opt_dest_struct_pattern lv, opt_dest_tuple_texpression rv) + with + | Some pats, Some vals -> + (* Tuple case *) + let pat_vals = List.combine pats vals in + let e = + List.fold_right + (fun (pat, v) next -> mk_let false pat v next) + pat_vals next + in + super#visit_expression env e.e + | _ -> super#visit_Let env monadic lv rv next + else super#visit_Let env monadic lv rv next | _ -> super#visit_Let env monadic lv rv next end in |