[Mono-bugs] [Bug 61800][Wis] Changed - [PATCH] Reduce initialization code in System.Reflection.Emit.OpCode

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Changed by lupus@ximian.com.

http://bugzilla.ximian.com/show_bug.cgi?id=61800

--- shadow/61800	2004-07-26 17:03:58.000000000 -0400
+++ shadow/61800.tmp.26945	2004-07-27 12:40:10.000000000 -0400
@@ -79,6 +79,21 @@
 pop behavior)
 
 - Since you have one byte left, you can inline OperandType into the struct
 
 - if you inline these items, the ILGenerator can do all of its
 operations without indexing the array
+
+------- Additional Comments From lupus@ximian.com  2004-07-27 12:40 -------
+push/pop cannot be combined in a single byte.
+A combined proposal could be:
+the ctor takes a single int which is op1, op2, push and pop in each
+byte and the ctor will set those fields (which should be readonly).
+The other four fields can go into an array (so mult by 4 can be
+optimized to a shift). As an alternative, the 4 fields could
+themselves be put in another int, so the ctor would take the two ints and
+set the proper fields. This would make for a 8 byte opcode struct
+which is fine and the generated code should remain small and there is
+no need for the byte array anymore. If we have a script that generates
+the code, we could experiment with the two options to measure and see
+the tradeoffs (the less used fields could be stored as an int, to
+reduce the time spen in the ctor if it turns out to be an issue).