A64: Implement FCMP, FCMPE

src/CMakeLists.txt

@@ -74,6 +74,7 @@ add_library(dynarmic
     frontend/A64/translate/impl/data_processing_register.cpp
     frontend/A64/translate/impl/data_processing_shift.cpp
     frontend/A64/translate/impl/exception_generating.cpp
+    frontend/A64/translate/impl/floating_point_compare.cpp
     frontend/A64/translate/impl/floating_point_data_processing_two_register.cpp
     frontend/A64/translate/impl/impl.cpp
     frontend/A64/translate/impl/impl.h

src/frontend/A64/decoder/a64.inc

@@ -929,8 +929,8 @@ INST(EOR_asimd,              "EOR (vector)",                              "0Q101
 //INST(FRINTI_float,           "FRINTI (scalar)",                           "00011110yy100111110000nnnnnddddd")
 
 // Data Processing - FP and SIMD - Floating point compare
-//INST(FCMP_float,             "FCMP",                                      "00011110yy1mmmmm001000nnnnn0-000")
+INST(FCMP_float,             "FCMP",                                      "00011110yy1mmmmm001000nnnnn0o000")
-//INST(FCMPE_float,            "FCMPE",                                     "00011110yy1mmmmm001000nnnnn1-000")
+INST(FCMPE_float,            "FCMPE",                                     "00011110yy1mmmmm001000nnnnn1o000")
 
 // Data Processing - FP and SIMD - Floating point immediate
 //INST(FMOV_float_imm,         "FMOV (scalar, immediate)",                  "00011110yy1iiiiiiii10000000ddddd")

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

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

@@ -983,8 +983,8 @@ struct TranslatorVisitor final {
     bool FRINTI_float(Imm<2> type, Vec Vn, Vec Vd);
 
     // Data Processing - FP and SIMD - Floating point compare
-    bool FCMP_float(Imm<2> type, Vec Vm, Vec Vn);
+    bool FCMP_float(Imm<2> type, Vec Vm, Vec Vn, bool cmp_with_zero);
-    bool FCMPE_float(Imm<2> type, Vec Vm, Vec Vn);
+    bool FCMPE_float(Imm<2> type, Vec Vm, Vec Vn, bool cmp_with_zero);
 
     // Data Processing - FP and SIMD - Floating point immediate
     bool FMOV_float_imm(Imm<2> type, Imm<8> imm8, Vec Vd);