llvm/test/Transforms/SROA/dead-inst.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes='bdce,sroa<preserve-cfg>,bdce' -S | FileCheck %s --check-prefixes=CHECK,CHECK-PRESERVE-CFG
; RUN: opt < %s -passes='bdce,sroa<modify-cfg>,bdce' -S | FileCheck %s --check-prefixes=CHECK,CHECK-MODIFY-CFG

; SROA fails to rewrite allocs but does rewrite some phis and delete
; dead instructions. Ensure that this invalidates analyses required
; for other passes.

target datalayout = "e-m:e-i64:64-n32:64"
target triple = "powerpc64le-grtev4-linux-gnu"

%class.b = type { i64 }

declare void @D(ptr sret(%class.b), ptr dereferenceable(32)) local_unnamed_addr

; Function Attrs: nounwind
define void @H(ptr noalias nocapture readnone, [2 x i64], ptr %ptr, i32 signext %v, i64 %l, i64 %idx, ptr nonnull dereferenceable(32) %ptr2) {
; CHECK-LABEL: @H(
; CHECK-NEXT:    [[TMP3:%.*]] = alloca [[CLASS_B:%.*]], align 8
; CHECK-NEXT:    [[TMP4:%.*]] = extractvalue [2 x i64] [[TMP1:%.*]], 1
; CHECK-NEXT:    switch i64 [[TMP4]], label [[TMP6:%.*]] [
; CHECK-NEXT:    i64 4, label [[FOO:%.*]]
; CHECK-NEXT:    i64 5, label [[TMP5:%.*]]
; CHECK-NEXT:    ]
; CHECK:       5:
; CHECK-NEXT:    br label [[TMP12:%.*]]
; CHECK:       6:
; CHECK-NEXT:    [[TMP7:%.*]] = icmp ugt i64 [[TMP4]], 5
; CHECK-NEXT:    br i1 [[TMP7]], label [[TMP8:%.*]], label [[TMP12]]
; CHECK:       8:
; CHECK-NEXT:    [[TMP9:%.*]] = load i8, ptr inttoptr (i64 4 to ptr), align 4
; CHECK-NEXT:    [[TMP10:%.*]] = icmp eq i8 [[TMP9]], 47
; CHECK-NEXT:    [[TMP11:%.*]] = select i1 [[TMP10]], i64 5, i64 4
; CHECK-NEXT:    br label [[TMP12]]
; CHECK:       12:
; CHECK-NEXT:    [[TMP13:%.*]] = phi i64 [ 4, [[TMP5]] ], [ [[TMP11]], [[TMP8]] ], [ 4, [[TMP6]] ]
; CHECK-NEXT:    [[TMP14:%.*]] = icmp ne i64 [[TMP4]], 0
; CHECK-NEXT:    [[TMP15:%.*]] = icmp ugt i64 [[TMP4]], [[TMP13]]
; CHECK-NEXT:    [[TMP16:%.*]] = and i1 [[TMP14]], [[TMP15]]
; CHECK-NEXT:    br i1 [[TMP16]], label [[TMP17:%.*]], label [[A_EXIT:%.*]]
; CHECK:       17:
; CHECK-NEXT:    [[TMP18:%.*]] = tail call ptr @memchr(ptr [[PTR:%.*]], i32 signext [[V:%.*]], i64 [[L:%.*]])
; CHECK-NEXT:    [[TMP19:%.*]] = icmp eq ptr [[TMP18]], null
; CHECK-NEXT:    [[TMP20:%.*]] = sext i1 [[TMP19]] to i64
; CHECK-NEXT:    br label [[A_EXIT]]
; CHECK:       a.exit:
; CHECK-NEXT:    [[TMP21:%.*]] = phi i64 [ -1, [[TMP12]] ], [ [[TMP20]], [[TMP17]] ]
; CHECK-NEXT:    [[TMP22:%.*]] = inttoptr i64 0 to ptr
; CHECK-NEXT:    [[TMP23:%.*]] = sub nsw i64 [[TMP21]], [[TMP13]]
; CHECK-NEXT:    call void @llvm.lifetime.start.p0(i64 32, ptr nonnull [[TMP3]])
; CHECK-NEXT:    [[TMP24:%.*]] = icmp ult i64 [[TMP23]], 2
; CHECK-NEXT:    br i1 [[TMP24]], label [[G_EXIT:%.*]], label [[TMP25:%.*]]
; CHECK:       25:
; CHECK-NEXT:    [[TMP26:%.*]] = getelementptr inbounds i8, ptr [[TMP22]], i64 [[IDX:%.*]]
; CHECK-NEXT:    [[TMP27:%.*]] = icmp eq ptr [[TMP26]], null
; CHECK-NEXT:    br i1 [[TMP27]], label [[TMP28:%.*]], label [[TMP29:%.*]]
; CHECK:       28:
; CHECK-NEXT:    unreachable
; CHECK:       29:
; CHECK-NEXT:    call void @D(ptr nonnull sret([[CLASS_B]]) [[TMP3]], ptr nonnull dereferenceable(32) [[PTR2:%.*]])
; CHECK-NEXT:    br label [[G_EXIT]]
; CHECK:       G.exit:
; CHECK-NEXT:    call void @llvm.lifetime.end.p0(i64 32, ptr nonnull [[TMP3]])
; CHECK-NEXT:    br label [[FOO]]
; CHECK:       foo:
; CHECK-NEXT:    ret void
;
  %3 = alloca %class.b, align 8
  %.sroa.0 = alloca i64, align 8
  store i64 0, ptr %.sroa.0, align 8
  %4 = extractvalue [2 x i64] %1, 1
  switch i64 %4, label %6 [
  i64 4, label %foo
  i64 5, label %5
  ]

; <label>:5:
  br label %12

; <label>:6:
  %7 = icmp ugt i64 %4, 5
  br i1 %7, label %8, label %12

; <label>:8:
  %9 = load i8, ptr inttoptr (i64 4 to ptr), align 4
  %10 = icmp eq i8 %9, 47
  %11 = select i1 %10, i64 5, i64 4
  br label %12

; <label>:12:
  %13 = phi ptr [ %.sroa.0, %5 ], [ %.sroa.0, %8 ], [ %.sroa.0, %6 ]
  %14 = phi i64 [ 4, %5 ], [ %11, %8 ], [ 4, %6 ]
  %15 = icmp ne i64 %4, 0
  %16 = icmp ugt i64 %4, %14
  %17 = and i1 %15, %16
  br i1 %17, label %18, label %a.exit

; <label>:18:
  %19 = tail call ptr @memchr(ptr %ptr, i32 signext %v, i64 %l)
  %20 = icmp eq ptr %19, null
  %21 = sext i1 %20 to i64
  br label %a.exit

a.exit:
  %22 = phi i64 [ -1, %12 ], [ %21, %18 ]
  %23 = load ptr, ptr %13, align 8
  %24 = sub nsw i64 %22, %14
  call void @llvm.lifetime.start.p0(i64 32, ptr nonnull %3)
  %25 = icmp ult i64 %24, 2
  br i1 %25, label %G.exit, label %26

; <label>:27:
  %27 = getelementptr inbounds i8, ptr %23, i64 %idx
  %28 = icmp eq ptr %27, null
  br i1 %28, label %29, label %30

; <label>:30:
  unreachable

; <label>:31:
  call void @D(ptr nonnull sret(%class.b) %3, ptr nonnull dereferenceable(32) %ptr2)
  br label %G.exit

G.exit:
  call void @llvm.lifetime.end.p0(i64 32, ptr nonnull %3)
  br label %foo

foo:
  ret void
}

; Function Attrs: nounwind readonly
declare ptr @memchr(ptr, i32 signext, i64) local_unnamed_addr

; Function Attrs: argmemonly nounwind
declare void @llvm.lifetime.start.p0(i64, ptr nocapture)

; Function Attrs: argmemonly nounwind
declare void @llvm.lifetime.end.p0(i64, ptr nocapture)
;; NOTE: These prefixes are unused and the list is autogenerated. Do not add tests below this line:
; CHECK-MODIFY-CFG: {{.*}}
; CHECK-PRESERVE-CFG: {{.*}}