File: dead-store-elimination.sil

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// RUN: %target-sil-opt %s -dead-store-elimination -enable-sil-verify-all | %FileCheck %s

// REQUIRES: swift_in_compiler

sil_stage canonical

import Swift
import Builtin

// We should be able to replace the local store with a debug_value.
// The dead store elimination pass is written in Swift, and should call
// salvage debug info when removing the store.

// CHECK-LABEL: @trivial_local_dead_store
// CHECK: debug_value %{{[0-9]+}} : $Int64, var, name "a"
// CHECK: return
sil hidden @trivial_local_dead_store : $@convention(thin) () -> () {
bb0:
  %0 = alloc_stack $Int64, var, name "a"
  %1 = integer_literal $Builtin.Int64, 1
  %2 = struct $Int64 (%1 : $Builtin.Int64)
  store %2 to %0 : $*Int64
  %4 = tuple ()
  dealloc_stack %0 : $*Int64
  return %4 : $()
}