Imported Upstream version 5.18.0.246

Former-commit-id: 0c7ce5b1a7851e13f22acfd379b7f9fb304e4833

external/llvm/test/Transforms/LoopRotate/vect.omp.persistence.ll

@@ -0,0 +1,34 @@
+; RUN: opt < %s -loop-rotate -S | FileCheck %s
+
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
+
+; Ensure that "llvm.loop.vectorize.enable" metadata was not lost after loop-rotate.
+; In past LoopRotate was clearing that metadata.
+;
+; See http://reviews.llvm.org/D3348 for details.
+
+; CHECK-LABEL: @foo
+; CHECK: loop_cond:
+; CHECK-NOT: loop-inc
+; CHECK: br i1 %cmp, label %return, label %loop_cond, !llvm.loop !0
+; CHECK: !0 = distinct !{!0, !1}
+; CHECK: !1 = !{!"llvm.loop.vectorize.enable", i1 true}
+define i32 @foo(i32 %a) {
+entry:
+  br label %loop_cond
+
+loop_cond:
+  %indx = phi i32 [ 1, %entry ], [ %inc, %loop_inc ]
+  %cmp = icmp ne i32 %indx, %a
+  br i1 %cmp, label %return, label %loop_inc
+
+loop_inc:
+  %inc = add i32 %indx, 1
+  br label %loop_cond, !llvm.loop !0
+
+return:
+  ret i32 0
+}
+
+!0 = !{!0, !1}
+!1 = !{!"llvm.loop.vectorize.enable", i1 true}