Stuff moved from old Matita.

[helm.git] / matita / matita / contribs / ng_assembly / emulator / opcodes / byte_or_word.ma

diff --git a/matita/matita/contribs/ng_assembly/emulator/opcodes/byte_or_word.ma b/matita/matita/contribs/ng_assembly/emulator/opcodes/byte_or_word.ma
new file mode 100755 (executable)
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+++ b/matita/matita/contribs/ng_assembly/emulator/opcodes/byte_or_word.ma
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+(**************************************************************************)
+(*       ___                                                              *)
+(*      ||M||                                                             *)
+(*      ||A||       A project by Andrea Asperti                           *)
+(*      ||T||                                                             *)
+(*      ||I||       Developers:                                           *)
+(*      ||T||         The HELM team.                                      *)
+(*      ||A||         http://helm.cs.unibo.it                             *)
+(*      \   /                                                             *)
+(*       \ /        This file is distributed under the terms of the       *)
+(*        v         GNU General Public License Version 2                  *)
+(*                                                                        *)
+(**************************************************************************)
+
+(* ********************************************************************** *)
+(*                          Progetto FreeScale                            *)
+(*                                                                        *)
+(*   Sviluppato da: Ing. Cosimo Oliboni, oliboni@cs.unibo.it              *)
+(*   Sviluppo: 2008-2010                                                  *)
+(*                                                                        *)
+(* ********************************************************************** *)
+
+include "num/word16.ma".
+
+(* raggruppamento di byte e word in un tipo unico *)
+ninductive byte8_or_word16 : Type ≝
+  Byte: byte8  → byte8_or_word16
+| Word: word16 → byte8_or_word16.
+
+ndefinition eq_b8w16 ≝
+λbw1,bw2:byte8_or_word16.
+ match bw1 with
+  [ Byte b1 ⇒ match bw2 with [ Byte b2 ⇒ eq_b8 b1 b2 | Word _ ⇒ false ]
+  | Word w1 ⇒ match bw2 with [ Byte _ ⇒ false | Word w2 ⇒ eq_w16 w1 w2 ]
+  ].