; RUN: llvm-reduce -abort-on-invalid-reduction --delta-passes=basic-blocks,simplify-cfg --test %python --test-arg %p/remove-bbs-sequence.py %s -o %t
; RUN: FileCheck %s < %t
; The interestingness test is that the CFG contains a loop. Verify that the
; unnecessary bb2 and bb3 are removed while still maintaining a loop.
define void @main() {
bb0:
br label %bb1
bb1:
br label %bb2
bb2:
br label %bb3
bb3:
%phi = phi i32 [ undef, %bb2 ]
br label %bb4
bb4:
br label %bb1
}
; CHECK:define void @main() {
; CHECK-NEXT: bb0:
; CHECK-NEXT: br label %bb4
; CHECK-EMPTY:
; CHECK-NEXT: bb4:
; CHECK-NEXT: %phi = phi i32 [ undef, %bb0 ], [ undef, %bb4 ]
; CHECK-NEXT: br label %bb4
; CHECK-NEXT:}