test/lit/passes/precompute-gc-loop.wast

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

;; RUN: wasm-opt %s --remove-unused-names --precompute-propagate --fuzz-exec -all -S -o - \
;; RUN:   | filecheck %s

(module
 ;; CHECK:      (type $struct (sub (struct (field i32))))
 (type $struct (sub (struct (field i32))))

 ;; CHECK:      (func $loop-different (type $1)
 ;; CHECK-NEXT:  (local $struct (ref null $struct))
 ;; CHECK-NEXT:  (local $int i32)
 ;; CHECK-NEXT:  (local.set $int
 ;; CHECK-NEXT:   (i32.const 0)
 ;; CHECK-NEXT:  )
 ;; CHECK-NEXT:  (loop $loop
 ;; CHECK-NEXT:   (local.set $struct
 ;; CHECK-NEXT:    (struct.new $struct
 ;; CHECK-NEXT:     (local.get $int)
 ;; CHECK-NEXT:    )
 ;; CHECK-NEXT:   )
 ;; CHECK-NEXT:   (local.set $int
 ;; CHECK-NEXT:    (i32.const 1)
 ;; CHECK-NEXT:   )
 ;; CHECK-NEXT:   (br_if $loop
 ;; CHECK-NEXT:    (i32.eqz
 ;; CHECK-NEXT:     (block $block1 (result i32)
 ;; CHECK-NEXT:      (block $block
 ;; CHECK-NEXT:       (drop
 ;; CHECK-NEXT:        (br_on_null $block
 ;; CHECK-NEXT:         (local.get $struct)
 ;; CHECK-NEXT:        )
 ;; CHECK-NEXT:       )
 ;; CHECK-NEXT:       (br $block1
 ;; CHECK-NEXT:        (struct.get $struct 0
 ;; CHECK-NEXT:         (local.get $struct)
 ;; CHECK-NEXT:        )
 ;; CHECK-NEXT:       )
 ;; CHECK-NEXT:      )
 ;; CHECK-NEXT:      (i32.const 0)
 ;; CHECK-NEXT:     )
 ;; CHECK-NEXT:    )
 ;; CHECK-NEXT:   )
 ;; CHECK-NEXT:  )
 ;; CHECK-NEXT: )
 (func $loop-different
  (local $struct (ref null $struct))
  (local $int i32)
  ;; This int is set before the loop, and read at the loop top. The value there
  ;; is *not* 0, because we set a new value in the loop, which takes effect in
  ;; later iterations.
  (local.set $int
   (i32.const 0)
  )
  (loop $loop
   (local.set $struct
    (struct.new $struct
     (local.get $int)
    )
   )
   (local.set $int
    (i32.const 1)
   )

   ;; The rest of the code is needed to prevent the testcase from getting
   ;; optimized trivially away. This br should not be optimized away or
   ;; simplified - it executes in the first loop iteration but not the second.
   (br_if $loop
    (i32.eqz
     (block $block1 (result i32)
      (block $block
       (drop
        (br_on_null $block
         (local.get $struct)
        )
       )
       (br $block1
        (struct.get $struct 0
         (local.get $struct)
        )
       )
      )
      (i32.const 0)
     )
    )
   )
  )
 )
)