A64: Implement CRC32C

src/frontend/A64/translate/impl/data_processing_crc32.cpp

@@ -0,0 +1,44 @@
+/* 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::CRC32C(bool sf, Reg Rm, Imm<2> sz, Reg Rn, Reg Rd) {
+    const u32 integral_size = sz.ZeroExtend();
+
+    if (sf && integral_size != 0b11) {
+        return UnallocatedEncoding();
+    }
+
+    if (!sf && integral_size == 0b11) {
+        return UnallocatedEncoding();
+    }
+
+    const IR::U32 result = [&] {
+        const size_t datasize = sf ? 64 : 32;
+        const IR::U32 accumulator = ir.GetW(Rn);
+        const IR::U32U64 data = X(datasize, Rm);
+
+        switch (integral_size) {
+        case 0b00:
+            return ir.CRC32Castagnoli8(accumulator, data);
+        case 0b01:
+            return ir.CRC32Castagnoli16(accumulator, data);
+        case 0b10:
+            return ir.CRC32Castagnoli32(accumulator, data);
+        case 0b11:
+        default:
+            return ir.CRC32Castagnoli64(accumulator, data);
+        }
+    }();
+
+    X(32, Rd, result);
+    return true;
+}
+
+} // namespace Dynarmic::A64