1 files changed, 98 insertions, 0 deletions
diff --git a/ARMeilleure/Decoders/OpCodeSimdImm.cs b/ARMeilleure/Decoders/OpCodeSimdImm.cs
new file mode 100644
index 00000000..ecad906d
--- /dev/null
+++ b/ARMeilleure/Decoders/OpCodeSimdImm.cs
@@ -0,0 +1,98 @@
+namespace ARMeilleure.Decoders
+{
+    class OpCodeSimdImm : OpCode, IOpCodeSimd
+    {
+        public int  Rd        { get; private set; }
+        public long Immediate { get; private set; }
+        public int  Size      { get; private set; }
+
+        public OpCodeSimdImm(InstDescriptor inst, ulong address, int opCode) : base(inst, address, opCode)
+        {
+            Rd = opCode & 0x1f;
+
+            int cMode = (opCode >> 12) & 0xf;
+            int op    = (opCode >> 29) & 0x1;
+
+            int modeLow  = cMode &  1;
+            int modeHigh = cMode >> 1;
+
+            long imm;
+
+            imm  = ((uint)opCode >>  5) & 0x1f;
+            imm |= ((uint)opCode >> 11) & 0xe0;
+
+            if (modeHigh == 0b111)
+            {
+                Size = modeLow != 0 ? op : 3;
+
+                switch (op | (modeLow << 1))
+                {
+                    case 0:
+                        // 64-bits Immediate.
+                        // Transform abcd efgh into abcd efgh abcd efgh ...
+                        imm = (long)((ulong)imm * 0x0101010101010101);
+                        break;
+
+                    case 1:
+                        // 64-bits Immediate.
+                        // Transform abcd efgh into aaaa aaaa bbbb bbbb ...
+                        imm = (imm & 0xf0) >> 4 | (imm & 0x0f) << 4;
+                        imm = (imm & 0xcc) >> 2 | (imm & 0x33) << 2;
+                        imm = (imm & 0xaa) >> 1 | (imm & 0x55) << 1;
+
+                        imm = (long)((ulong)imm * 0x8040201008040201);
+                        imm = (long)((ulong)imm & 0x8080808080808080);
+
+                        imm |= imm >> 4;
+                        imm |= imm >> 2;
+                        imm |= imm >> 1;
+                        break;
+
+                    case 2:
+                    case 3:
+                        // Floating point Immediate.
+                        imm = DecoderHelper.DecodeImm8Float(imm, Size);
+                        break;
+                }
+            }
+            else if ((modeHigh & 0b110) == 0b100)
+            {
+                // 16-bits shifted Immediate.
+                Size = 1; imm <<= (modeHigh & 1) << 3;
+            }
+            else if ((modeHigh & 0b100) == 0b000)
+            {
+                // 32-bits shifted Immediate.
+                Size = 2; imm <<= modeHigh << 3;
+            }
+            else if ((modeHigh & 0b111) == 0b110)
+            {
+                // 32-bits shifted Immediate (fill with ones).
+                Size = 2; imm = ShlOnes(imm, 8 << modeLow);
+            }
+            else
+            {
+                // 8 bits without shift.
+                Size = 0;
+            }
+
+            Immediate = imm;
+
+            RegisterSize = ((opCode >> 30) & 1) != 0
+                ? RegisterSize.Simd128
+                : RegisterSize.Simd64;
+        }
+
+        private static long ShlOnes(long value, int shift)
+        {
+            if (shift != 0)
+            {
+                return value << shift | (long)(ulong.MaxValue >> (64 - shift));
+            }
+            else
+            {
+                return value;
+            }
+        }
+    }
+}
+\ No newline at end of file