A64: Implement FCMP, FCMPE

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

@@ -0,0 +1,62 @@
+/* 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 <boost/optional.hpp>
+
+#include "frontend/A64/translate/impl/impl.h"
+
+namespace Dynarmic::A64 {
+
+static boost::optional<size_t> GetDataSize(Imm<2> type) {
+    switch (type.ZeroExtend()) {
+    case 0b00:
+        return 32;
+    case 0b01:
+        return 64;
+    case 0b11:
+        // FP16Ext, unimplemented.
+        return boost::none;
+    }
+    return boost::none;
+}
+
+bool TranslatorVisitor::FCMP_float(Imm<2> type, Vec Vm, Vec Vn, bool cmp_with_zero) {
+    auto datasize = GetDataSize(type);
+    if (!datasize) {
+        return UnallocatedEncoding();
+    }
+
+    const IR::U32U64 operand1 = V_scalar(*datasize, Vn);
+    IR::U32U64 operand2;
+    if (cmp_with_zero) {
+        operand2 = I(*datasize, 0);
+    } else {
+        operand2 = V_scalar(*datasize, Vm);
+    }
+
+    ir.FPCompare(operand1, operand2, false, true);
+    return true;
+}
+
+bool TranslatorVisitor::FCMPE_float(Imm<2> type, Vec Vm, Vec Vn, bool cmp_with_zero) {
+    auto datasize = GetDataSize(type);
+    if (!datasize) {
+        return UnallocatedEncoding();
+    }
+
+    const IR::U32U64 operand1 = V_scalar(*datasize, Vn);
+    IR::U32U64 operand2;
+    if (cmp_with_zero) {
+        operand2 = I(*datasize, 0);
+    } else {
+        operand2 = V_scalar(*datasize, Vm);
+    }
+
+    ir.FPCompare(operand1, operand2, true, true);
+    return true;
+}
+
+} // namespace Dynarmic::A64