1 files changed, 53 insertions, 0 deletions
diff --git a/Spv.Generator/InstructionOperands.cs b/Spv.Generator/InstructionOperands.cs
new file mode 100644
index 00000000..c7170ec1
--- /dev/null
+++ b/Spv.Generator/InstructionOperands.cs
@@ -0,0 +1,53 @@
+using System;
+using System.Runtime.InteropServices;
+
+namespace Spv.Generator
+{
+    public struct InstructionOperands
+    {
+        private const int InternalCount = 5;
+
+        public int Count;
+        public Operand Operand1;
+        public Operand Operand2;
+        public Operand Operand3;
+        public Operand Operand4;
+        public Operand Operand5;
+        public Operand[] Overflow;
+
+        public Span<Operand> ToSpan()
+        {
+            if (Count > InternalCount)
+            {
+                return MemoryMarshal.CreateSpan(ref this.Overflow[0], Count);
+            }
+            else
+            {
+                return MemoryMarshal.CreateSpan(ref this.Operand1, Count);
+            }
+        }
+
+        public void Add(Operand operand)
+        {
+            if (Count < InternalCount)
+            {
+                MemoryMarshal.CreateSpan(ref this.Operand1, Count + 1)[Count] = operand;
+                Count++;
+            }
+            else
+            {
+                if (Overflow == null)
+                {
+                    Overflow = new Operand[InternalCount * 2];
+                    MemoryMarshal.CreateSpan(ref this.Operand1, InternalCount).CopyTo(Overflow.AsSpan());
+                }
+                else if (Count == Overflow.Length)
+                {
+                    Array.Resize(ref Overflow, Overflow.Length * 2);
+                }
+
+                Overflow[Count++] = operand;
+            }
+        }
+    }
+}