xref: /llvm-project/llvm/test/Transforms/SCCP/dangling-block-address.ll (revision 0991da36906bdb29b8f1030d5123bafb58fee79e)

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -passes=internalize,ipsccp %s | FileCheck %s
; PR5569

; If BasicBlocks are unreachable, IPSCCP should convert them to unreachable.
; Unless they have their address taken, delete them. If they do have their
; address taken, let other passes replace these "dead" blockaddresses with some
; other Constant.

; CHECK: @bar.l = internal constant [2 x ptr] [ptr blockaddress(@bar, %lab0), ptr blockaddress(@bar, %end)]


@code = global [5 x i32] [i32 0, i32 0, i32 0, i32 0, i32 1], align 4 ; <ptr> [#uses=0]
@bar.l = internal constant [2 x ptr] [ptr blockaddress(@bar, %lab0), ptr blockaddress(@bar, %end)] ; <ptr> [#uses=1]

define void @foo(i32 %x) nounwind readnone {
; CHECK-LABEL: @foo(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    unreachable
;
entry:
  %b = alloca i32, align 4                        ; <ptr> [#uses=1]
  store volatile i32 -1, ptr %b
  ret void
}

define void @bar(ptr nocapture %pc) nounwind readonly {
; CHECK-LABEL: @bar(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    unreachable
; CHECK:       lab0:
; CHECK-NEXT:    unreachable
; CHECK:       end:
; CHECK-NEXT:    unreachable
;
entry:
  br label %indirectgoto

lab0:                                             ; preds = %indirectgoto
  %indvar.next = add i32 %indvar, 1               ; <i32> [#uses=1]
  br label %indirectgoto

end:                                              ; preds = %indirectgoto
  ret void

indirectgoto:                                     ; preds = %lab0, %entry
  %indvar = phi i32 [ %indvar.next, %lab0 ], [ 0, %entry ] ; <i32> [#uses=2]
  %pc.addr.0 = getelementptr i32, ptr %pc, i32 %indvar ; <ptr> [#uses=1]
  %tmp1.pn = load i32, ptr %pc.addr.0                 ; <i32> [#uses=1]
  %indirect.goto.dest.in = getelementptr inbounds [2 x ptr], ptr @bar.l, i32 0, i32 %tmp1.pn ; <ptr> [#uses=1]
  %indirect.goto.dest = load ptr, ptr %indirect.goto.dest.in ; <ptr> [#uses=1]
  indirectbr ptr %indirect.goto.dest, [label %lab0, label %end]
}

define i32 @main() nounwind readnone {
; CHECK-LABEL: @main(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    unreachable
;
entry:
  ret i32 0
}

; https://github.com/llvm/llvm-project/issues/54238
; https://github.com/llvm/llvm-project/issues/54251
; https://github.com/llvm/llvm-project/issues/54328
define i32 @test1() {
; CHECK-LABEL: @test1(
; CHECK-NEXT:    unreachable
; CHECK:       redirected:
; CHECK-NEXT:    unreachable
;
  %1 = bitcast ptr blockaddress(@test1, %redirected) to ptr
  call void @set_return_addr(ptr %1)
  ret i32 0

redirected:
  ret i32 0
}

define internal void @set_return_addr(ptr %addr) {
; CHECK-LABEL: @set_return_addr(
; CHECK-NEXT:    unreachable
;
  %addr.addr = alloca ptr, i32 0, align 8
  store ptr %addr, ptr %addr.addr, align 8
  ret void
}