1 files changed, 52 insertions, 0 deletions
diff --git a/llvm/test/Transforms/LoopUnroll/runtime-loop4.ll b/llvm/test/Transforms/LoopUnroll/runtime-loop4.ll
new file mode 100644
index 00000000000..4a9104eb00d
--- /dev/null
+++ b/llvm/test/Transforms/LoopUnroll/runtime-loop4.ll
@@ -0,0 +1,52 @@
+; RUN: opt < %s -S -O2 -unroll-runtime=true -unroll-runtime-epilog=true  | FileCheck %s -check-prefix=EPILOG
+; RUN: opt < %s -S -O2 -unroll-runtime=true -unroll-runtime-epilog=false | FileCheck %s -check-prefix=PROLOG
+
+; Check runtime unrolling prologue can be promoted by LICM pass.
+
+; EPILOG: entry:
+; EPILOG: %xtraiter
+; EPILOG: %lcmp.mod
+; EPILOG: loop1:
+; EPILOG: br i1 %lcmp.mod
+; EPILOG: loop2.epil:
+
+; PROLOG: entry:
+; PROLOG: %xtraiter
+; PROLOG: %lcmp.mod
+; PROLOG: loop1:
+; PROLOG: br i1 %lcmp.mod
+; PROLOG: loop2.prol:
+
+define void @unroll(i32 %iter, i32* %addr1, i32* %addr2) nounwind {
+entry:
+  br label %loop1
+
+loop1:
+  %iv1 = phi i32 [ 0, %entry ], [ %inc1, %loop1.latch ]
+  %offset1 = getelementptr i32, i32* %addr1, i32 %iv1
+  store i32 %iv1, i32* %offset1, align 4
+  br label %loop2.header
+
+loop2.header:
+  %e = icmp uge i32 %iter, 1
+  br i1 %e, label %loop2, label %exit2
+
+loop2:
+  %iv2 = phi i32 [ 0, %loop2.header ], [ %inc2, %loop2 ]
+  %offset2 = getelementptr i32, i32* %addr2, i32 %iv2
+  store i32 %iv2, i32* %offset2, align 4
+  %inc2 = add i32 %iv2, 1
+  %exitcnd2 = icmp uge i32 %inc2, %iter
+  br i1 %exitcnd2, label %exit2, label %loop2
+
+exit2:
+  br label %loop1.latch
+
+loop1.latch:
+  %inc1 = add i32 %iv1, 1
+  %exitcnd1 = icmp uge i32 %inc1, 1024
+  br i1 %exitcnd1, label %exit, label %loop1
+
+exit:
+  ret void
+}