vm: deprecate move-immediate instructions.

The movrsi, movrmi and movrbi (move immediate {small, medium,
big} to register) instructions are becoming deprecated.
The reasoning is that character and fixnum operands can just
go into a VM descriptor's data vector (D registers). Then they
can be referenced directly without wastefully issuing an extra
instruction.

* genvmop.txr: Add a deprecated comment next to the enum
constants of deprecated opcodes.
* share/txr/stdlib/asm.tl (oc-base): Add Boolean property
which indicates that an opcode is deprecated. This is a static
class variable, defaulting to nil in the base class.
(op-movrsi, op-movsmi, op-movrbi): Override base class
deprecated property with a true value.

* vmop.h: Regenerated.

1 files changed, 3 insertions, 3 deletions

diff --git a/vmop.h b/vmop.h
index 7c2e6185..3f2c2f43 100644
--- a/vmop.h
+++ b/vmop.h
@@ -40,9 +40,9 @@ typedef enum vm_op {
   MOVRS = 11,
   MOVSR = 12,
   MOVRR = 13,
-  MOVRSI = 14,
-  MOVSMI = 15,
-  MOVRBI = 16,
+  MOVRSI = 14, /* deprecated */
+  MOVSMI = 15, /* deprecated */
+  MOVRBI = 16, /* deprecated */
   JMP = 17,
   IF = 18,
   IFQ = 19,