test/lit/passes/vacuum-strings.wast

;; NOTE: Assertions have been generated by update_lit_checks.py and should not be edited.
;; RUN: wasm-opt %s --vacuum -all -S -o - | filecheck %s

(module
  ;; CHECK:      (func $compare (type $0)
  ;; CHECK-NEXT:  (drop
  ;; CHECK-NEXT:   (string.compare
  ;; CHECK-NEXT:    (string.const "hello")
  ;; CHECK-NEXT:    (ref.null none)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:  )
  ;; CHECK-NEXT:  (drop
  ;; CHECK-NEXT:   (string.compare
  ;; CHECK-NEXT:    (ref.null none)
  ;; CHECK-NEXT:    (string.const "world")
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:  )
  ;; CHECK-NEXT:  (drop
  ;; CHECK-NEXT:   (string.compare
  ;; CHECK-NEXT:    (ref.null none)
  ;; CHECK-NEXT:    (ref.null none)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:  )
  ;; CHECK-NEXT: )
  (func $compare
    ;; We cannot vacuum away compares that might trap.
    (drop
      (string.compare
        (string.const "hello")
        (string.const "world")
      )
    )
    (drop
      (string.compare
        (string.const "hello")
        (ref.null none)
      )
    )
    (drop
      (string.compare
        (ref.null none)
        (string.const "world")
      )
    )
    (drop
      (string.compare
        (ref.null none)
        (ref.null none)
      )
    )
  )

  ;; CHECK:      (func $eq (type $0)
  ;; CHECK-NEXT:  (nop)
  ;; CHECK-NEXT: )
  (func $eq
    ;; Equals, however, never traps so all these can be removed.
    (drop
      (string.eq
        (string.const "hello")
        (string.const "world")
      )
    )
    (drop
      (string.eq
        (string.const "hello")
        (ref.null none)
      )
    )
    (drop
      (string.eq
        (ref.null none)
        (string.const "world")
      )
    )
    (drop
      (string.eq
        (ref.null none)
        (ref.null none)
      )
    )
  )
)