A64: Implement EXT

src/CMakeLists.txt

@@ -101,6 +101,7 @@ add_library(dynarmic
     frontend/A64/translate/impl/simd_aes.cpp
     frontend/A64/translate/impl/simd_copy.cpp
     frontend/A64/translate/impl/simd_crypto_four_register.cpp
+    frontend/A64/translate/impl/simd_extract.cpp
     frontend/A64/translate/impl/simd_modified_immediate.cpp
     frontend/A64/translate/impl/simd_permute.cpp
     frontend/A64/translate/impl/simd_scalar_pairwise.cpp

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

@@ -0,0 +1,28 @@
+/* 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 "frontend/A64/translate/impl/impl.h"
+
+namespace Dynarmic::A64 {
+
+bool TranslatorVisitor::EXT(bool Q, Vec Vm, Imm<4> imm4, Vec Vn, Vec Vd) {
+    if (!Q && imm4.Bit<3>()) {
+        return UnallocatedEncoding();
+    }
+
+    const size_t datasize = Q ? 128 : 64;
+    const size_t position = imm4.ZeroExtend<size_t>() << 3;
+
+    const IR::U128 lo = V(datasize, Vn);
+    const IR::U128 hi = V(datasize, Vm);
+    const IR::U128 result = ir.VectorExtract(lo, hi, position);
+
+    V(datasize, Vd, result);
+
+    return true;
+}
+
+} // namespace Dynarmic::A64