From 1fb0957aa39bda226cdc0dfa33c36a8ca511c7ed Mon Sep 17 00:00:00 2001
From: MerryMage <MerryMage@users.noreply.github.com>
Date: Sat, 3 Feb 2018 01:23:11 +0000
Subject: [PATCH] A64: Implement FCVT

---
 src/frontend/A64/decoder/a64.inc              |  2 +-
 ...ing_point_data_processing_one_register.cpp | 48 +++++++++++++++++++
 2 files changed, 49 insertions(+), 1 deletion(-)

diff --git a/src/frontend/A64/decoder/a64.inc b/src/frontend/A64/decoder/a64.inc
index 4c6b4445..871f8073 100644
--- a/src/frontend/A64/decoder/a64.inc
+++ b/src/frontend/A64/decoder/a64.inc
@@ -919,7 +919,7 @@ INST(EOR_asimd,              "EOR (vector)",                              "0Q101
 //INST(FABS_float,             "FABS (scalar)",                             "00011110yy100000110000nnnnnddddd")
 //INST(FNEG_float,             "FNEG (scalar)",                             "00011110yy100001010000nnnnnddddd")
 //INST(FSQRT_float,            "FSQRT (scalar)",                            "00011110yy100001110000nnnnnddddd")
-//INST(FCVT_float,             "FCVT",                                      "00011110yy10001oo10000nnnnnddddd")
+INST(FCVT_float,             "FCVT",                                      "00011110yy10001oo10000nnnnnddddd")
 //INST(FRINTN_float,           "FRINTN (scalar)",                           "00011110yy100100010000nnnnnddddd")
 //INST(FRINTP_float,           "FRINTP (scalar)",                           "00011110yy100100110000nnnnnddddd")
 //INST(FRINTM_float,           "FRINTM (scalar)",                           "00011110yy100101010000nnnnnddddd")
diff --git a/src/frontend/A64/translate/impl/floating_point_data_processing_one_register.cpp b/src/frontend/A64/translate/impl/floating_point_data_processing_one_register.cpp
index c38187d3..8066aa29 100644
--- a/src/frontend/A64/translate/impl/floating_point_data_processing_one_register.cpp
+++ b/src/frontend/A64/translate/impl/floating_point_data_processing_one_register.cpp
@@ -56,4 +56,52 @@ bool TranslatorVisitor::FMOV_float_imm(Imm<2> type, Imm<8> imm8, Vec Vd) {
     return true;
 }
 
+bool TranslatorVisitor::FCVT_float(Imm<2> type, Imm<2> opc, Vec Vn, Vec Vd) {
+    if (type == opc) {
+        return UnallocatedEncoding();
+    }
+
+    boost::optional<size_t> srcsize = GetDataSize(type);
+    boost::optional<size_t> dstsize = GetDataSize(opc);
+
+    if (!srcsize || !dstsize) {
+        return UnallocatedEncoding();
+    }
+
+    IR::UAny operand = V_scalar(*srcsize, Vn);
+    IR::UAny result;
+    switch (*srcsize) {
+    case 16:
+        switch (*dstsize) {
+        case 32:
+            return InterpretThisInstruction();
+        case 64:
+            return InterpretThisInstruction();
+        }
+        break;
+    case 32:
+        switch (*dstsize) {
+        case 16:
+            return InterpretThisInstruction();
+        case 64:
+            result = ir.FPSingleToDouble(operand, true);
+            break;
+        }
+        break;
+    case 64:
+    switch (*dstsize) {
+        case 16:
+            return InterpretThisInstruction();
+        case 32:
+            result = ir.FPDoubleToSingle(operand, true);
+            break;
+        }
+        break;
+    }
+
+    V_scalar(*dstsize, Vd, result);
+
+    return true;
+}
+
 } // namespace Dynarmic::A64