[dev.power64] code review 160200044: build: merge default into dev.power64

src/cmd/6g/peep.c

 // Derived from Inferno utils/6c/peep.c
 // http://code.google.com/p/inferno-os/source/browse/utils/6c/peep.c
 //
 //      Copyright © 1994-1999 Lucent Technologies Inc.  All rights reserved.
 //      Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
 //      Portions Copyright © 1997-1999 Vita Nuova Limited
 //      Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
 //      Portions Copyright © 2004,2006 Bruce Ellis
 //      Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
 //      Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
@@ skipping 820 matching lines @@
 }
 
 /*
  * direct reference,
  * could be set/use depending on
  * semantics
  */
 static int
 copyas(Adr *a, Adr *v)
 {
+        if(D_AL <= a->type && a->type <= D_R15B)
+                fatal("use of byte register");
+        if(D_AL <= v->type && v->type <= D_R15B)
+                fatal("use of byte register");
+
         if(a->type != v->type)
                 return 0;
         if(regtyp(v))
                 return 1;
         if(v->type == D_AUTO || v->type == D_PARAM)
                 if(v->offset == a->offset)
                         return 1;
         return 0;
 }
 
@@ skipping 125 matching lines @@
                 a->type == D_INDIR + reg->type &&
                 a->index == D_NONE &&
                 0 <= a->offset && a->offset < 4096;
 }
 
 int
 stackaddr(Addr *a)
 {
         return regtyp(a) && a->type == D_SP;
 }