test/SILOptimizer/redundant_load_and_dead_store_elim.sil

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

// NOTE, the order redundant-load and dead-store are ran is important. we have a pass dependence for some
// of the tests to work.

sil_stage canonical

import Builtin
import Swift
import SwiftShims

struct A {
  var i : Builtin.Int32
}

struct AA {
  var a : A
  var i : Builtin.Int32
}

class B {
  var i : Builtin.Int32
  init()
}

struct X {
  var c : B
  init()
}

enum Optional<T> {
  case none
  case some(T)
}

class E : B { }

struct C {
  var i : Builtin.Int16
}

struct D {
  var p : Builtin.RawPointer
}

sil @use : $@convention(thin) (Builtin.Int32) -> ()
sil @use_a : $@convention(thin) (@in A) -> ()
sil @escaped_a_ptr : $@convention(thin) () -> @out A
sil @escaped_a : $@convention(thin) () -> Builtin.RawPointer


struct Agg2 {
  var t : (Builtin.Int64, Builtin.Int32)
}

struct Agg1 {
  var a : Agg2
}

struct Wrapper {
  var value : Builtin.Int32
}



sil_global @test_global : $Int64

/// Make sure we don't ignore aliasing stores.
//
// CHECK-LABEL: sil @aliasing_store
// CHECK: {{store }}
// CHECK-NOT: {{store }}
// CHECK-NOT: {{load }}
// CHECK: return
sil @aliasing_store : $@convention(thin) (@inout A) -> () {
bb0(%0: $*A):
  %1 = alloc_stack $A
  %2 = integer_literal $Builtin.Int32, 0
  %3 = struct $A (%2 : $Builtin.Int32)
  store %3 to %1 : $*A
  %4 = struct_element_addr %1 : $*A, #A.i
  %5 = integer_literal $Builtin.Int32, 1
  store  %5 to %4 : $*Builtin.Int32
  %6 = load %1 : $*A
  store %6 to %0: $*A
  dealloc_stack %1 : $*A
  %7 = tuple()
  return %7 : $()
}



// Test that the optimization does not crash when deleting a previous
// dead store in another block.
// In this case deleting 'store %32 to %11' when visiting 'store %22 to %11'.

// CHECK-LABEL: sil @testit
// CHECK: {{^bb1:}}
// CHECK-NOT: {{load  }}
// CHECK: {{^bb2(.*):}}
// CHECK-NOT: {{store }}
// CHECK: bb3:
sil @testit : $@convention(thin) () -> () {
bb0:
  %11 = global_addr @test_global : $*Int64
  %12 = integer_literal $Builtin.Int64, 0
  %13 = struct $Int64 (%12 : $Builtin.Int64)
  store %13 to %11 : $*Int64
  %15 = integer_literal $Builtin.Int64, 10
  %16 = integer_literal $Builtin.Int1, -1
  %18 = struct_element_addr %11 : $*Int64, #Int64._value
  br bb2(%12 : $Builtin.Int64)

bb1:
  %21 = load %18 : $*Builtin.Int64
  %22 = struct $Int64 (%21 : $Builtin.Int64)
  store %22 to %11 : $*Int64
  %r = tuple ()
  return %r : $()

bb2(%25 : $Builtin.Int64):
  %28 = load %18 : $*Builtin.Int64
  %29 = builtin "sadd_with_overflow_Int64"(%28 : $Builtin.Int64, %25 : $Builtin.Int64, %16 : $Builtin.Int1) : $(Builtin.Int64, Builtin.Int1)
  %30 = tuple_extract %29 : $(Builtin.Int64, Builtin.Int1), 0
  %32 = struct $Int64 (%30 : $Builtin.Int64)
  store %32 to %11 : $*Int64
  %35 = builtin "cmp_eq_Int64"(%30 : $Builtin.Int64, %15 : $Builtin.Int64) : $Builtin.Int1
  cond_br %35, bb1, bb3

bb3:
  br bb2(%30 : $Builtin.Int64)

}

// CHECK-LABEL: sil @dead_store_removal_not_stopped_by_nonaliasing_readwrites : $@convention(thin) (@inout Builtin.Int32) -> (Builtin.Int32, Builtin.Int32, Builtin.Int32) {
// CHECK: bb0([[INPUT_PTR1:%[0-9]+]] : $*Builtin.Int32):
// CHECK: {{load }}
// CHECK-NOT: {{store }}
// CHECK: return
sil @dead_store_removal_not_stopped_by_nonaliasing_readwrites : $@convention(thin) (@inout Builtin.Int32) -> (Builtin.Int32, Builtin.Int32, Builtin.Int32) {
bb0(%0 : $*Builtin.Int32):
  %1 = alloc_stack $Builtin.Int32
  %2 = alloc_stack $Builtin.Int32
  %3 = integer_literal $Builtin.Int32, 32
  store %3 to %2 : $*Builtin.Int32
  %4 = load %0 : $*Builtin.Int32
  store %3 to %1 : $*Builtin.Int32
  store %3 to %2 : $*Builtin.Int32
  %5 = load %0 : $*Builtin.Int32
  store %3 to %1 : $*Builtin.Int32
  %6 = load %2 : $*Builtin.Int32
  dealloc_stack %2 : $*Builtin.Int32
  dealloc_stack %1 : $*Builtin.Int32
  %7 = tuple(%4 : $Builtin.Int32, %5 : $Builtin.Int32, %6 : $Builtin.Int32)
  return %7 : $(Builtin.Int32, Builtin.Int32, Builtin.Int32)
}


// Check that we can perform partial load forwarding.
// CHECK-LABEL: sil @forward_partial_aliasing_loads : $@convention(thin) (@in AA) -> () {
// CHECK: bb0([[INPUT_PTR:%.*]] : $*AA):
// CHECK: {{load }}
// CHECK: {{load }}
// CHECK: {{load }}
// CHECK-NOT: {{load }}
// CHECK: return
sil @forward_partial_aliasing_loads : $@convention(thin) (@in AA) -> () {
bb0(%0 : $*AA):
  %1 = struct_element_addr %0 : $*AA, #AA.a
  %2 = struct_element_addr %1 : $*A, #A.i
  %3 = load %2 : $*Builtin.Int32

  %4 = load %0 : $*AA
  %5 = struct_extract %4 : $AA, #AA.a
  %6 = struct_extract %5 : $A, #A.i
  %7 = function_ref @use : $@convention(thin) (Builtin.Int32) -> ()
  apply %7(%3) : $@convention(thin) (Builtin.Int32) -> ()
  apply %7(%6) : $@convention(thin) (Builtin.Int32) -> ()

  %8 = struct_extract %4 : $AA, #AA.i
  apply %7(%8) : $@convention(thin) (Builtin.Int32) -> ()

  %9 = alloc_stack $AA

  %13 = load %9 : $*AA
  %10 = struct_element_addr %9 : $*AA, #AA.a
  %11 = struct_element_addr %10 : $*A, #A.i
  %12 = load %11 : $*Builtin.Int32

  %14 = struct_extract %13 : $AA, #AA.a
  %15 = struct_extract %14 : $A, #A.i

  apply %7(%12) : $@convention(thin) (Builtin.Int32) -> ()
  apply %7(%15) : $@convention(thin) (Builtin.Int32) -> ()

  dealloc_stack %9 : $*AA

  %9999 = tuple()
  return %9999 : $()
}