1 files changed, 54 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/Hexagon/rdf-copy.ll b/llvm/test/CodeGen/Hexagon/rdf-copy.ll
new file mode 100644
index 00000000000..96153ca31fa
--- /dev/null
+++ b/llvm/test/CodeGen/Hexagon/rdf-copy.ll
@@ -0,0 +1,54 @@
+; RUN: llc -march=hexagon < %s | FileCheck %s
+; 
+; Check that
+;     {
+;         r1 = r0
+;     }
+;     {
+;         r0 = memw(r1 + #0)
+;     }
+; was copy-propagated to
+;     {
+;         r1 = r0
+;         r0 = memw(r0 + #0)
+;     }
+;
+; CHECK-LABEL: LBB0_1
+; CHECK: [[DST:r[0-9]+]] = [[SRC:r[0-9]+]]
+; CHECK-DAG: memw([[SRC]]
+; CHECK-DAG-NOT: memw([[DST]]
+; CHECK-LABEL: LBB0_2
+
+target datalayout = "e-p:32:32:32-i64:64:64-i32:32:32-i16:16:16-i1:32:32-f64:64:64-f32:32:32-v64:64:64-v32:32:32-a0:0-n16:32"
+target triple = "hexagon"
+
+%union.t = type { %struct.t, [64 x i8] }
+%struct.t = type { [12 x i8], %struct.r*, double }
+%struct.r = type opaque
+
+define %union.t* @foo(%union.t* %chain) nounwind readonly {
+entry:
+  %tobool = icmp eq %union.t* %chain, null
+  br i1 %tobool, label %if.end, label %while.cond.preheader
+
+while.cond.preheader:                             ; preds = %entry
+  br label %while.cond
+
+while.cond:                                       ; preds = %while.cond.preheader, %while.cond
+  %chain.addr.0 = phi %union.t* [ %0, %while.cond ], [ %chain, %while.cond.preheader ]
+  %chain1 = bitcast %union.t* %chain.addr.0 to %union.t**
+  %0 = load %union.t*, %union.t** %chain1, align 4, !tbaa !0
+  %tobool2 = icmp eq %union.t* %0, null
+  br i1 %tobool2, label %if.end.loopexit, label %while.cond
+
+if.end.loopexit:                                  ; preds = %while.cond
+  br label %if.end
+
+if.end:                                           ; preds = %if.end.loopexit, %entry
+  %chain.addr.1 = phi %union.t* [ null, %entry ], [ %chain.addr.0, %if.end.loopexit ]
+  ret %union.t* %chain.addr.1
+}
+
+!0 = !{!"any pointer", !1}
+!1 = !{!"omnipotent char", !2}
+!2 = !{!"Simple C/C++ TBAA"}