test/lit/passes/dae_tnh.wast

;; NOTE: Assertions have been generated by update_lit_checks.py --all-items and should not be edited.

;; RUN: foreach %s %t wasm-opt --dae --all-features -tnh -S -o - | filecheck %s

(module
  ;; CHECK:      (type $none_=>_none (func))

  ;; CHECK:      (type $struct (struct (field i32)))
  (type $struct (struct_subtype (field i32) data))

  ;; CHECK:      (type $ref?|$struct|_=>_none (func (param (ref null $struct))))

  ;; CHECK:      (func $target (type $none_=>_none)
  ;; CHECK-NEXT:  (local $0 i32)
  ;; CHECK-NEXT:  (nop)
  ;; CHECK-NEXT: )
  (func $target (param $x i32)
    (nop)
  )

  ;; CHECK:      (func $caller (type $ref?|$struct|_=>_none) (param $ref (ref null $struct))
  ;; CHECK-NEXT:  (call $target)
  ;; CHECK-NEXT: )
  (func $caller (param $ref (ref null $struct))
    (call $target
      ;; This might trap in theory, but in traps-never-happen mode which is
      ;; enabled here, we can ignore and remove such side effects, allowing us
      ;; to optimize away this parameter which is never used.
      (struct.get $struct 0
        (local.get $ref)
      )
    )
  )
)

(module
  ;; CHECK:      (type $none_=>_none (func))

  ;; CHECK:      (type $i32_=>_none (func (param i32)))

  ;; CHECK:      (func $caller (type $none_=>_none)
  ;; CHECK-NEXT:  (call $target
  ;; CHECK-NEXT:   (unreachable)
  ;; CHECK-NEXT:  )
  ;; CHECK-NEXT: )
  (func $caller
    ;; Removing this parameter would require the type of the call to change from
    ;; unreachable to none. We don't handle such complexity and ignore such
    ;; cases.
    (call $target
      (unreachable)
    )
  )

  ;; CHECK:      (func $target (type $i32_=>_none) (param $0 i32)
  ;; CHECK-NEXT:  (nop)
  ;; CHECK-NEXT: )
  (func $target (param i32)
  )
)

;; As above, but use a return_call. We can optimize that, since return_calls
;; have type unreachable anyhow, and the optimization would not change the type.
(module
  ;; CHECK:      (type $none_=>_none (func))

  ;; CHECK:      (func $caller (type $none_=>_none)
  ;; CHECK-NEXT:  (return_call $target)
  ;; CHECK-NEXT: )
  (func $caller
    (return_call $target
      (unreachable)
    )
  )

  ;; CHECK:      (func $target (type $none_=>_none)
  ;; CHECK-NEXT:  (local $0 i32)
  ;; CHECK-NEXT:  (nop)
  ;; CHECK-NEXT: )
  (func $target (param i32)
  )
)

(module
  ;; CHECK:      (type $i32_=>_none (func (param i32)))

  ;; CHECK:      (type $none_=>_none (func))

  ;; CHECK:      (func $target (type $i32_=>_none) (param $0 i32)
  ;; CHECK-NEXT:  (local $1 f64)
  ;; CHECK-NEXT:  (local.set $1
  ;; CHECK-NEXT:   (f64.const 4.2)
  ;; CHECK-NEXT:  )
  ;; CHECK-NEXT:  (drop
  ;; CHECK-NEXT:   (local.get $0)
  ;; CHECK-NEXT:  )
  ;; CHECK-NEXT: )
  (func $target (param $used i32) (param $unused f64)
    ;; One parameter is used, and one is not.
    (drop
      (local.get $used)
    )
  )

  ;; CHECK:      (func $caller (type $none_=>_none)
  ;; CHECK-NEXT:  (call $target
  ;; CHECK-NEXT:   (unreachable)
  ;; CHECK-NEXT:  )
  ;; CHECK-NEXT: )
  (func $caller
    ;; There is an unreachable parameter, and as in the cases above, we can't
    ;; remove it as it would change the type. But it isn't the param we want to
    ;; remove here, so we can optimize: we'll remove the other param, and leave
    ;; the unreachable, and the type does not change.
    (call $target
      (unreachable)
      (f64.const 4.2)
    )
  )
)