llvm/test/Transforms/LCSSA/unreachable-use.ll

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

; LCSSA doesn't need to transform uses in blocks not reachable
; from the entry block.

; PR6546
define void @test_pr6546(ptr %src, i1 %c) {
; CHECK-LABEL: @test_pr6546(
; CHECK-NEXT:  bb:
; CHECK-NEXT:    br label [[BB44:%.*]]
; CHECK:       bb44:
; CHECK-NEXT:    br i1 [[C:%.*]], label [[BB7:%.*]], label [[BB45:%.*]]
; CHECK:       bb7:
; CHECK-NEXT:    [[TMP:%.*]] = getelementptr ptr, ptr [[SRC:%.*]], i64 3
; CHECK-NEXT:    br label [[BB15:%.*]]
; CHECK:       bb15:
; CHECK-NEXT:    br label [[BB44]]
; CHECK:       bb32:
; CHECK-NEXT:    [[TMP33:%.*]] = load ptr, ptr [[TMP]], align 8
; CHECK-NEXT:    br label [[BB45]]
; CHECK:       bb45:
; CHECK-NEXT:    unreachable
;
bb:
  br label %bb44

bb44:
  br i1 %c, label %bb7, label %bb45

bb7:
  %tmp = getelementptr ptr, ptr %src, i64 3
  br label %bb15

bb15:
  br label %bb44

bb32:
  %tmp33 = load ptr, ptr %tmp, align 8
  br label %bb45

bb45:
  unreachable
}

define void @multiple_unreachable_uses(ptr %A, ptr %B) {
entry:
  br label %loop

loop:
  %gep.A = getelementptr inbounds float, ptr %A, i64 10
  %gep.B = getelementptr inbounds ptr, ptr %B, i64 20
  br i1 false, label %exit, label %loop

dead:                 ; No predecessors!
  %l1 = load float, ptr %gep.A, align 4
  %l2 = load ptr, ptr %gep.B, align 8
  br label %exit

exit:
  ret void
}