Imported Upstream version 6.0.0.172

Former-commit-id: f3cc9b82f3e5bd8f0fd3ebc098f789556b44e9cd

external/llvm/test/Transforms/CodeGenPrepare/split-indirect-loop.ll

@@ -0,0 +1,37 @@
+; RUN: opt -codegenprepare -S < %s | FileCheck %s
+
+; Test that an invalid CFG is not created by splitIndirectCriticalEdges
+; transformation when the 'target' block is a loop to itself.
+
+; CHECK: .split:
+; CHECK: br label %while.body.clone
+; CHECK: if.else1:
+; CHECK: indirectbr
+; CHECK: while.body.clone:
+; CHECK: br label %.split
+
+define void @test() {
+entry:
+  br label %if.else
+
+if.else:
+  br i1 undef, label %while.body, label %preheader
+
+preheader:
+  br label %if.else1
+
+if.then:
+  unreachable
+
+while.body:
+  %dest.sroa = phi i32 [ %1, %while.body ], [ undef, %if.else1 ], [ undef, %if.else ]
+  %0 = inttoptr i32 %dest.sroa to i8*
+  %incdec.ptr = getelementptr inbounds i8, i8* %0, i32 -1
+  %1 = ptrtoint i8* %incdec.ptr to i32
+  store i8 undef, i8* %incdec.ptr, align 1
+  br label %while.body
+
+if.else1:
+  indirectbr i8* undef, [label %if.then, label %while.body, label %if.else, label %if.else1]
+}
+