R600/SI: Add testcase for problem I ran into

with the older version of the moveToVALU changes.

llvm-svn: 194682

llvm/test/CodeGen/R600/sgpr-copy-duplicate-operand.ll

+; RUN: llc -march=r600 -mcpu=SI < %s | FileCheck -check-prefix=SI %s
+
+; Copy VGPR -> SGPR used twice as an instruction operand, which is then
+; used in an REG_SEQUENCE that also needs to be handled.
+
+; SI-LABEL: @test_dup_operands:
+; SI: V_ADD_I32_e32
+define void @test_dup_operands(<2 x i32> addrspace(1)* noalias %out, <2 x i32> addrspace(1)* noalias %in) {
+  %a = load <2 x i32> addrspace(1)* %in
+  %lo = extractelement <2 x i32> %a, i32 0
+  %hi = extractelement <2 x i32> %a, i32 1
+  %add = add i32 %lo, %lo
+  %vec0 = insertelement <2 x i32> undef, i32 %add, i32 0
+  %vec1 = insertelement <2 x i32> %vec0, i32 %hi, i32 1
+  store <2 x i32> %vec1, <2 x i32> addrspace(1)* %out, align 8
+  ret void
+}
+