Imported Upstream version 5.18.0.225

Former-commit-id: 10196d987d5fc5564b9d3b33b1fdf13190f4d0b5

external/llvm/test/Transforms/IndVarSimplify/2011-11-17-selfphi.ll

@@ -0,0 +1,29 @@
+; RUN: opt < %s -indvars -S | FileCheck %s
+; PR11350: Check that SimplifyIndvar handles a cycle of useless self-phis.
+
+; CHECK-LABEL: @test(
+; CHECK-NOT: lcssa = phi
+define void @test() nounwind {
+entry:
+  br label %for.cond.preheader
+
+for.cond.preheader:                               ; preds = %entry
+  br label %for.cond.outer
+
+for.cond.outer:                                   ; preds = %for.cond.preheader, %for.end
+  %p_41.addr.0.ph = phi i32 [ %p_41.addr.1.lcssa, %for.end ], [ 1, %for.cond.preheader ]
+  br label %for.cond
+
+for.cond:
+  br i1 true, label %for.end, label %for.ph
+
+for.ph:                                   ; preds = %for.cond4.preheader
+  br label %for.end
+
+for.end:
+  %p_41.addr.1.lcssa = phi i32 [ undef, %for.ph ], [ %p_41.addr.0.ph, %for.cond ]
+  %p_68.lobit.i = lshr i32 %p_41.addr.1.lcssa, 31
+  %cmp7 = icmp eq i32 %p_41.addr.1.lcssa, 0
+  %conv8 = zext i1 %cmp7 to i32
+  br label %for.cond.outer
+}