llvm/test/Transforms/DeadStoreElimination/multiblock-simple.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=dse -S | FileCheck %s

target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"


define void @test2(ptr noalias %P) {
; CHECK-LABEL: @test2(
; CHECK-NEXT:    br i1 true, label [[BB1:%.*]], label [[BB2:%.*]]
; CHECK:       bb1:
; CHECK-NEXT:    br label [[BB3:%.*]]
; CHECK:       bb2:
; CHECK-NEXT:    br label [[BB3]]
; CHECK:       bb3:
; CHECK-NEXT:    store i32 0, ptr [[P:%.*]], align 4
; CHECK-NEXT:    ret void
;
  store i32 1, ptr %P
  br i1 true, label %bb1, label %bb2
bb1:
  br label %bb3
bb2:
  br label %bb3
bb3:
  store i32 0, ptr %P
  ret void
}

define void @test3(ptr noalias %P) {
; CHECK-LABEL: @test3(
; CHECK-NEXT:    store i32 0, ptr [[P:%.*]], align 4
; CHECK-NEXT:    br i1 true, label [[BB1:%.*]], label [[BB2:%.*]]
; CHECK:       bb1:
; CHECK-NEXT:    br label [[BB3:%.*]]
; CHECK:       bb2:
; CHECK-NEXT:    store i32 1, ptr [[P]], align 4
; CHECK-NEXT:    br label [[BB3]]
; CHECK:       bb3:
; CHECK-NEXT:    ret void
;
  store i32 0, ptr %P
  br i1 true, label %bb1, label %bb2
bb1:
  br label %bb3
bb2:
  store i32 1, ptr %P
  br label %bb3
bb3:
  ret void
}


define void @test7(ptr noalias %P, ptr noalias %Q) {
; CHECK-LABEL: @test7(
; CHECK-NEXT:    br i1 true, label [[BB1:%.*]], label [[BB2:%.*]]
; CHECK:       bb1:
; CHECK-NEXT:    [[TMP1:%.*]] = load i32, ptr [[P:%.*]], align 4
; CHECK-NEXT:    br label [[BB3:%.*]]
; CHECK:       bb2:
; CHECK-NEXT:    br label [[BB3]]
; CHECK:       bb3:
; CHECK-NEXT:    store i32 0, ptr [[Q:%.*]], align 4
; CHECK-NEXT:    store i32 0, ptr [[P]], align 4
; CHECK-NEXT:    ret void
;
  store i32 1, ptr %Q
  br i1 true, label %bb1, label %bb2
bb1:
  load i32, ptr %P
  br label %bb3
bb2:
  br label %bb3
bb3:
  store i32 0, ptr %Q
  store i32 0, ptr %P
  ret void
}

define i32 @test22(ptr %P, ptr noalias %Q, ptr %R) {
; CHECK-LABEL: @test22(
; CHECK-NEXT:    store i32 2, ptr [[P:%.*]], align 4
; CHECK-NEXT:    store i32 3, ptr [[Q:%.*]], align 4
; CHECK-NEXT:    [[L:%.*]] = load i32, ptr [[R:%.*]], align 4
; CHECK-NEXT:    ret i32 [[L]]
;
  store i32 1, ptr %Q
  store i32 2, ptr %P
  store i32 3, ptr %Q
  %l = load i32, ptr %R
  ret i32 %l
}

define void @test9(ptr noalias %P) {
; CHECK-LABEL: @test9(
; CHECK-NEXT:    store i32 0, ptr [[P:%.*]], align 4
; CHECK-NEXT:    br i1 true, label [[BB1:%.*]], label [[BB2:%.*]]
; CHECK:       bb1:
; CHECK-NEXT:    br label [[BB3:%.*]]
; CHECK:       bb2:
; CHECK-NEXT:    ret void
; CHECK:       bb3:
; CHECK-NEXT:    store i32 1, ptr [[P]], align 4
; CHECK-NEXT:    ret void
;
  store i32 0, ptr %P
  br i1 true, label %bb1, label %bb2
bb1:
  br label %bb3
bb2:
  ret void
bb3:
  store i32 1, ptr %P
  ret void
}

; We cannot eliminate `store i32 0, ptr %P`, as it is read by the later load.
; Make sure that we check the uses of `store i32 1, ptr %P.1 which does not
; alias %P. Note that uses point to the *first* def that may alias.
define void @overlapping_read(ptr %P) {
; CHECK-LABEL: @overlapping_read(
; CHECK-NEXT:    store i32 0, ptr [[P:%.*]], align 4
; CHECK-NEXT:    [[P_1:%.*]] = getelementptr i32, ptr [[P]], i32 1
; CHECK-NEXT:    store i32 1, ptr [[P_1]], align 4
; CHECK-NEXT:    [[LV:%.*]] = load i64, ptr [[P]], align 8
; CHECK-NEXT:    br i1 true, label [[BB1:%.*]], label [[BB2:%.*]]
; CHECK:       bb1:
; CHECK-NEXT:    br label [[BB3:%.*]]
; CHECK:       bb2:
; CHECK-NEXT:    br label [[BB3]]
; CHECK:       bb3:
; CHECK-NEXT:    store i32 2, ptr [[P]], align 4
; CHECK-NEXT:    ret void
;
  store i32 0, ptr %P
  %P.1 = getelementptr i32, ptr %P, i32 1
  store i32 1, ptr %P.1

  %lv = load i64, ptr %P
  br i1 true, label %bb1, label %bb2
bb1:
  br label %bb3
bb2:
  br label %bb3
bb3:
  store i32 2, ptr %P
  ret void
}

define void @test10(ptr %P) {
; CHECK-LABEL: @test10(
; CHECK-NEXT:    store i32 0, ptr [[P:%.*]], align 4
; CHECK-NEXT:    br i1 true, label [[BB1:%.*]], label [[BB2:%.*]]
; CHECK:       bb1:
; CHECK-NEXT:    store i32 1, ptr [[P]], align 4
; CHECK-NEXT:    br label [[BB3:%.*]]
; CHECK:       bb2:
; CHECK-NEXT:    ret void
; CHECK:       bb3:
; CHECK-NEXT:    ret void
;
  store i32 0, ptr %P
  br i1 true, label %bb1, label %bb2
bb1:
  store i32 1, ptr %P
  br label %bb3
bb2:
  ret void
bb3:
  ret void
}


define void @test11() {
; CHECK-LABEL: @test11(
; CHECK-NEXT:    br i1 true, label [[BB1:%.*]], label [[BB2:%.*]]
; CHECK:       bb1:
; CHECK-NEXT:    br label [[BB3:%.*]]
; CHECK:       bb2:
; CHECK-NEXT:    ret void
; CHECK:       bb3:
; CHECK-NEXT:    ret void
;
  %P = alloca i32
  store i32 0, ptr %P
  br i1 true, label %bb1, label %bb2
bb1:
  store i32 0, ptr %P
  br label %bb3
bb2:
  ret void
bb3:
  ret void
}


define void @test12(ptr %P) {
; CHECK-LABEL: @test12(
; CHECK-NEXT:    br i1 true, label [[BB1:%.*]], label [[BB2:%.*]]
; CHECK:       bb1:
; CHECK-NEXT:    store i32 1, ptr [[P:%.*]], align 4
; CHECK-NEXT:    br label [[BB3:%.*]]
; CHECK:       bb2:
; CHECK-NEXT:    store i32 1, ptr [[P]], align 4
; CHECK-NEXT:    ret void
; CHECK:       bb3:
; CHECK-NEXT:    ret void
;
  store i32 0, ptr %P
  br i1 true, label %bb1, label %bb2
bb1:
  store i32 1, ptr %P
  br label %bb3
bb2:
  store i32 1, ptr %P
  ret void
bb3:
  ret void
}


define void @test13(ptr %P) {
; CHECK-LABEL: @test13(
; CHECK-NEXT:    br i1 true, label [[BB1:%.*]], label [[BB2:%.*]]
; CHECK:       bb1:
; CHECK-NEXT:    store i32 1, ptr [[P:%.*]], align 4
; CHECK-NEXT:    br label [[BB3:%.*]]
; CHECK:       bb2:
; CHECK-NEXT:    store i32 1, ptr [[P]], align 4
; CHECK-NEXT:    br label [[BB3]]
; CHECK:       bb3:
; CHECK-NEXT:    ret void
;
  store i32 0, ptr %P
  br i1 true, label %bb1, label %bb2
bb1:
  store i32 1, ptr %P
  br label %bb3
bb2:
  store i32 1, ptr %P
  br label %bb3
bb3:
  ret void
}