From 8765b421b7d8d9eb57325a77e23b19b8164db868 Mon Sep 17 00:00:00 2001
From: MerryMage <MerryMage@users.noreply.github.com>
Date: Sun, 4 Feb 2018 13:40:37 +0000
Subject: [PATCH] A64: Implement FCSEL

---
 src/CMakeLists.txt                            |  1 +
 src/frontend/A64/decoder/a64.inc              |  2 +-
 .../floating_point_conditional_select.cpp     | 39 +++++++++++++++++++
 3 files changed, 41 insertions(+), 1 deletion(-)
 create mode 100644 src/frontend/A64/translate/impl/floating_point_conditional_select.cpp

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 04a67e2c..9795b357 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -76,6 +76,7 @@ add_library(dynarmic
     frontend/A64/translate/impl/exception_generating.cpp
     frontend/A64/translate/impl/floating_point_compare.cpp
     frontend/A64/translate/impl/floating_point_conversion_integer.cpp
+    frontend/A64/translate/impl/floating_point_conditional_select.cpp
     frontend/A64/translate/impl/floating_point_data_processing_one_register.cpp
     frontend/A64/translate/impl/floating_point_data_processing_two_register.cpp
     frontend/A64/translate/impl/impl.cpp
diff --git a/src/frontend/A64/decoder/a64.inc b/src/frontend/A64/decoder/a64.inc
index bfadf3be..31281442 100644
--- a/src/frontend/A64/decoder/a64.inc
+++ b/src/frontend/A64/decoder/a64.inc
@@ -943,7 +943,7 @@ INST(FSUB_float,             "FSUB (scalar)",                             "00011
 INST(FNMUL_float,            "FNMUL (scalar)",                            "00011110yy1mmmmm100010nnnnnddddd")
 
 // Data Processing - FP and SIMD - Floating point conditional select
-//INST(FCSEL_float,            "FCSEL",                                     "00011110yy1mmmmmcccc11nnnnnddddd")
+INST(FCSEL_float,            "FCSEL",                                     "00011110yy1mmmmmcccc11nnnnnddddd")
 
 // Data Processing - FP and SIMD - Floating point data processing three register
 //INST(FMADD_float,            "FMADD",                                     "00011111yy0mmmmm0aaaaannnnnddddd")
diff --git a/src/frontend/A64/translate/impl/floating_point_conditional_select.cpp b/src/frontend/A64/translate/impl/floating_point_conditional_select.cpp
new file mode 100644
index 00000000..5b016db4
--- /dev/null
+++ b/src/frontend/A64/translate/impl/floating_point_conditional_select.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 <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:
+        return 16;
+    }
+    return boost::none;
+}
+
+bool TranslatorVisitor::FCSEL_float(Imm<2> type, Vec Vm, Cond cond, Vec Vn, Vec Vd) {
+    const auto datasize = GetDataSize(type);
+    if (!datasize || *datasize == 16) {
+        return UnallocatedEncoding();
+    }
+
+    const IR::U32U64 operand1 = V_scalar(*datasize, Vn);
+    const IR::U32U64 operand2 = V_scalar(*datasize, Vm);
+    const IR::U32U64 result = ir.ConditionalSelect(cond, operand1, operand2);
+    V_scalar(*datasize, Vd, result);
+
+    return true;
+}
+
+} // namespace Dynarmic::A64