Add a test for r280191

llvm-svn: 281694

diff --git a/llvm/test/Transforms/SimplifyCFG/PR30210.ll b/llvm/test/Transforms/SimplifyCFG/PR30210.ll
new file mode 100644 (file)
index 0000000..a2aa825
--- /dev/null
+++ b/llvm/test/Transforms/SimplifyCFG/PR30210.ll
@@ -0,0 +1,36 @@
+; RUN: opt -S -simplifycfg < %s | FileCheck %s
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+declare i32* @fn1(i32* returned)
+
+define i32 @test1(i1 %B) {
+entry:
+  br label %for.cond.us
+
+for.cond.us:                                      ; preds = %for.cond.us, %entry
+  br i1 %B, label %for.cond4.preheader, label %for.cond.us
+
+for.cond4.preheader:                              ; preds = %for.cond.us
+  br i1 %B, label %for.cond4.preheader.split.us, label %for.cond4
+
+for.cond4.preheader.split.us:                     ; preds = %for.cond4.preheader
+  unreachable
+
+for.cond4:                                        ; preds = %for.end, %for.cond4.preheader
+  %phi = phi i32* [ %call, %for.end ], [ undef, %for.cond4.preheader ]
+  %call = call i32* @fn1(i32* %phi)
+  br label %for.cond5
+
+for.cond5:                                        ; preds = %for.cond5, %for.cond4
+  br i1 %B, label %for.cond5, label %for.end
+
+for.end:                                          ; preds = %for.cond5
+  %load = load i32, i32* %call, align 4
+  br label %for.cond4
+}
+
+; CHECK-LABEL: define i32 @test1(
+; CHECK: br label %[[LABEL:.*]]
+; CHECK: [[LABEL]]:
+; CHECK: br label %[[LABEL]]