test/lit/passes/tail-call-tnh.wast

;; NOTE: Assertions have been generated by update_lit_checks.py and should not be edited.
;; Test tail-call optimization with --traps-never-happen (-tnh).

;; RUN: wasm-opt %s --tail-call --enable-tail-call -S -o - | filecheck %s --check-prefix=DEFAULT
;; RUN: wasm-opt %s --tail-call -tnh --enable-tail-call -S -o - | filecheck %s --check-prefix=TNH

(module
  (memory 1 1)
  ;; DEFAULT:      (global $g (mut i32) (i32.const 0))
  ;; TNH:      (global $g (mut i32) (i32.const 0))
  (global $g (mut i32) (i32.const 0))

  ;; DEFAULT:      (func $value-callee (result i32)
  ;; DEFAULT-NEXT:  (i32.const 1)
  ;; DEFAULT-NEXT: )
  ;; TNH:      (func $value-callee (result i32)
  ;; TNH-NEXT:  (i32.const 1)
  ;; TNH-NEXT: )
  (func $value-callee (result i32)
    (i32.const 1)
  )

  ;; DEFAULT:      (func $br-if-trapping-condition (param $x i32) (result i32)
  ;; DEFAULT-NEXT:  (block $out (result i32)
  ;; DEFAULT-NEXT:   (br_if $out
  ;; DEFAULT-NEXT:    (call $value-callee)
  ;; DEFAULT-NEXT:    (i32.load
  ;; DEFAULT-NEXT:     (local.get $x)
  ;; DEFAULT-NEXT:    )
  ;; DEFAULT-NEXT:   )
  ;; DEFAULT-NEXT:  )
  ;; DEFAULT-NEXT: )
  ;; TNH:      (func $br-if-trapping-condition (param $x i32) (result i32)
  ;; TNH-NEXT:  (block $out
  ;; TNH-NEXT:   (block
  ;; TNH-NEXT:    (return_call $value-callee)
  ;; TNH-NEXT:    (drop
  ;; TNH-NEXT:     (i32.load
  ;; TNH-NEXT:      (local.get $x)
  ;; TNH-NEXT:     )
  ;; TNH-NEXT:    )
  ;; TNH-NEXT:   )
  ;; TNH-NEXT:  )
  ;; TNH-NEXT: )
  (func $br-if-trapping-condition (param $x i32) (result i32)
    ;; Without -tnh, the load in the condition might trap, so converting the
    ;; call to a return_call (which skips the condition) is disallowed. With
    ;; -tnh, the load's trap is ignored and the call becomes a return_call.
    (block $out (result i32)
      (br_if $out
        (call $value-callee)
        (i32.load
          (local.get $x)
        )
      )
    )
  )

  ;; DEFAULT:      (func $br-table-trapping-condition (param $x i32) (result i32)
  ;; DEFAULT-NEXT:  (block $out1 (result i32)
  ;; DEFAULT-NEXT:   (block $out2 (result i32)
  ;; DEFAULT-NEXT:    (br_table $out1 $out2
  ;; DEFAULT-NEXT:     (call $value-callee)
  ;; DEFAULT-NEXT:     (i32.div_s
  ;; DEFAULT-NEXT:      (i32.const 10)
  ;; DEFAULT-NEXT:      (local.get $x)
  ;; DEFAULT-NEXT:     )
  ;; DEFAULT-NEXT:    )
  ;; DEFAULT-NEXT:   )
  ;; DEFAULT-NEXT:  )
  ;; DEFAULT-NEXT: )
  ;; TNH:      (func $br-table-trapping-condition (param $x i32) (result i32)
  ;; TNH-NEXT:  (block $out1
  ;; TNH-NEXT:   (block $out2
  ;; TNH-NEXT:    (block
  ;; TNH-NEXT:     (return_call $value-callee)
  ;; TNH-NEXT:     (drop
  ;; TNH-NEXT:      (i32.div_s
  ;; TNH-NEXT:       (i32.const 10)
  ;; TNH-NEXT:       (local.get $x)
  ;; TNH-NEXT:      )
  ;; TNH-NEXT:     )
  ;; TNH-NEXT:    )
  ;; TNH-NEXT:   )
  ;; TNH-NEXT:  )
  ;; TNH-NEXT: )
  (func $br-table-trapping-condition (param $x i32) (result i32)
    ;; Similarly, a potentially trapping division in a br_table condition
    ;; prevents tail-call conversion unless -tnh is enabled.
    (block $out1 (result i32)
      (block $out2 (result i32)
        (br_table $out1 $out2
          (call $value-callee)
          (i32.div_s
            (i32.const 10)
            (local.get $x)
          )
        )
      )
    )
  )

  ;; DEFAULT:      (func $br-if-non-trap-side-effect (result i32)
  ;; DEFAULT-NEXT:  (block $out (result i32)
  ;; DEFAULT-NEXT:   (br_if $out
  ;; DEFAULT-NEXT:    (call $value-callee)
  ;; DEFAULT-NEXT:    (block (result i32)
  ;; DEFAULT-NEXT:     (global.set $g
  ;; DEFAULT-NEXT:      (i32.const 1)
  ;; DEFAULT-NEXT:     )
  ;; DEFAULT-NEXT:     (i32.const 0)
  ;; DEFAULT-NEXT:    )
  ;; DEFAULT-NEXT:   )
  ;; DEFAULT-NEXT:  )
  ;; DEFAULT-NEXT: )
  ;; TNH:      (func $br-if-non-trap-side-effect (result i32)
  ;; TNH-NEXT:  (block $out (result i32)
  ;; TNH-NEXT:   (br_if $out
  ;; TNH-NEXT:    (call $value-callee)
  ;; TNH-NEXT:    (block (result i32)
  ;; TNH-NEXT:     (global.set $g
  ;; TNH-NEXT:      (i32.const 1)
  ;; TNH-NEXT:     )
  ;; TNH-NEXT:     (i32.const 0)
  ;; TNH-NEXT:    )
  ;; TNH-NEXT:   )
  ;; TNH-NEXT:  )
  ;; TNH-NEXT: )
  (func $br-if-non-trap-side-effect (result i32)
    ;; Non-trap side effects (like global.set) in a condition still inhibit
    ;; optimization even when -tnh is enabled.
    (block $out (result i32)
      (br_if $out
        (call $value-callee)
        (block (result i32)
          (global.set $g
            (i32.const 1)
          )
          (i32.const 0)
        )
      )
    )
  )
)