A64: Implement DUP (general)

src/frontend/A64/translate/impl/simd_copy.cpp

@@ -0,0 +1,41 @@
+/* This file is part of the dynarmic project.
+ * Copyright (c) 2018 MerryMage
+ * This software may be used and distributed according to the terms of the GNU
+ * General Public License version 2 or any later version.
+ */
+
+#include "common/bit_util.h"
+#include "frontend/A64/translate/impl/impl.h"
+
+namespace Dynarmic {
+namespace A64 {
+
+bool TranslatorVisitor::DUP_gen(bool Q, Imm<5> imm5, Reg Rn, Vec Vd) {
+    const size_t size = Common::LowestSetBit(imm5.ZeroExtend());
+    if (size > 3) return UnallocatedEncoding();
+    if (size == 3 && !Q) return ReservedValue();
+    const size_t esize = 8 << size;
+    const size_t datasize = Q ? 128 : 64;
+
+    const IR::UAny element = X(esize, Rn);
+
+    const IR::U128 result = [&]{
+        switch (esize) {
+        case 8:
+            return Q ? ir.VectorBroadcast8(element) : ir.VectorLowerBroadcast8(element);
+        case 16:
+            return Q ? ir.VectorBroadcast16(element) : ir.VectorLowerBroadcast16(element);
+        case 32:
+            return Q ? ir.VectorBroadcast32(element) : ir.VectorLowerBroadcast32(element);
+        default:
+            return ir.VectorBroadcast64(element);
+        }
+    }();
+
+    V(datasize, Vd, result);
+
+    return true;
+}
+
+} // namespace A64
+} // namespace Dynarmic