A64: Implement TBL and TBX

src/CMakeLists.txt

@@ -164,6 +164,7 @@ add_library(dynarmic
     frontend/A64/translate/impl/simd_sha.cpp
     frontend/A64/translate/impl/simd_sha512.cpp
     frontend/A64/translate/impl/simd_shift_by_immediate.cpp
+    frontend/A64/translate/impl/simd_table_lookup.cpp
     frontend/A64/translate/impl/simd_three_different.cpp
     frontend/A64/translate/impl/simd_three_same.cpp
     frontend/A64/translate/impl/simd_three_same_extra.cpp

src/frontend/A64/decoder/a64.inc

@@ -511,8 +511,8 @@ INST(FMUL_elt_2,             "FMUL (by element)",                         "01011
 //INST(FMULX_elt_2,            "FMULX (by element)",                        "011111111zLMmmmm1001H0nnnnnddddd")
 
 // Data Processing - FP and SIMD - SIMD Table Lookup
-//INST(TBL,                    "TBL",                                       "0Q001110000mmmmm0LL000nnnnnddddd")
+INST(TBL,                    "TBL",                                       "0Q001110000mmmmm0LL000nnnnnddddd")
-//INST(TBX,                    "TBX",                                       "0Q001110000mmmmm0LL100nnnnnddddd")
+INST(TBX,                    "TBX",                                       "0Q001110000mmmmm0LL100nnnnnddddd")
 
 // Data Processing - FP and SIMD - SIMD Permute
 INST(UZP1,                   "UZP1",                                      "0Q001110zz0mmmmm000110nnnnnddddd")

src/frontend/A64/translate/impl/impl.h

@@ -621,8 +621,8 @@ struct TranslatorVisitor final {
     bool FMULX_elt_2(bool sz, bool L, bool M, Vec Vm, bool H, Vec Vn, Vec Vd);
 
     // Data Processing - FP and SIMD - SIMD Table Lookup
-    bool TBL(bool Q, Vec Vm, Imm<2> len, Vec Vn, Vec Vd);
+    bool TBL(bool Q, Vec Vm, Imm<2> len, size_t Vn, Vec Vd);
-    bool TBX(bool Q, Vec Vm, Imm<2> len, Vec Vn, Vec Vd);
+    bool TBX(bool Q, Vec Vm, Imm<2> len, size_t Vn, Vec Vd);
 
     // Data Processing - FP and SIMD - SIMD Permute
     bool UZP1(bool Q, Imm<2> size, Vec Vm, Vec Vn, Vec Vd);

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

@@ -0,0 +1,39 @@
+/* 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 {
+
+static bool TableLookup(TranslatorVisitor& v, bool Q, Vec Vm, Imm<2> len, bool is_tbl, size_t Vn, Vec Vd) {
+    const size_t datasize = Q ? 128 : 64;
+
+    const IR::Table table = v.ir.VectorTable([&]{
+        std::vector<IR::U128> result;
+        for (size_t i = 0; i < len.ZeroExtend<size_t>() + 1; ++i) {
+            result.emplace_back(v.ir.GetQ(static_cast<Vec>((Vn + i) % 32)));
+        }
+        return result;
+    }());
+
+    const IR::U128 indicies = v.ir.GetQ(Vm);
+    const IR::U128 defaults = is_tbl ? v.ir.ZeroVector() : v.ir.GetQ(Vd);
+
+    const IR::U128 result = v.ir.VectorTableLookup(defaults, table, indicies);
+
+    v.V(datasize, Vd, datasize == 128 ? result : v.ir.VectorZeroUpper(result));
+    return true;
+}
+
+bool TranslatorVisitor::TBL(bool Q, Vec Vm, Imm<2> len, size_t Vn, Vec Vd) {
+    return TableLookup(*this, Q, Vm, len, true, Vn, Vd);
+}
+
+bool TranslatorVisitor::TBX(bool Q, Vec Vm, Imm<2> len, size_t Vn, Vec Vd) {
+    return TableLookup(*this, Q, Vm, len, false, Vn, Vd);
+}
+
+} // namespace Dynarmic::A64