x86: undo Prefix_0X<nn> use in opcode table

The table entries are more natural to read (and slightly shorter) when
the prefixes, like is the case for VEX/XOP/EVEX-encoded entries, are
specified as part of the opcode. This is particularly noticable for
side-by-side legacy and SSE2AVX entries.

An implication is that we now need to use "unsigned long long" for the
initially parsed opcode in i386-gen. I don't expect this to be an issue.

opcodes/ChangeLog

@@ -1,3 +1,11 @@
+2021-03-29  Jan Beulich  <jbeulich@suse.com>
+
+	* i386-gen.c (output_i386_opcode): Widen type of "opcode". Use
+	strtoull(). Bump upper loop bound. Widen masks. Sanity check
+	"length".
+	* i386-opc.tbl (Prefix_0X66, Prefix_0XF2, Prefix_0XF3): Delete.
+	Convert all of their uses to representation in opcode.
+
 2021-03-29  Jan Beulich  <jbeulich@suse.com>
 
 	* i386-opc.h (struct insn_template): Shrink base_opcode to 16

opcodes/i386-gen.c

@@ -1371,7 +1371,7 @@ output_i386_opcode (FILE *table, const char *name, char *str,
   unsigned int i, length, prefix = 0, space = 0;
   char *base_opcode, *extension_opcode, *end;
   char *cpu_flags, *opcode_modifier, *operand_types [MAX_OPERANDS];
-  unsigned long int opcode;
+  unsigned long long opcode;
 
   /* Find base_opcode.  */
   base_opcode = next_field (str, ',', &str, last);
@@ -1418,10 +1418,10 @@ output_i386_opcode (FILE *table, const char *name, char *str,
 	}
     }
 
-  opcode = strtoul (base_opcode, &end, 0);
+  opcode = strtoull (base_opcode, &end, 0);
 
   /* Determine opcode length.  */
-  for (length = 1; length < 4; ++length)
+  for (length = 1; length < 8; ++length)
     if (!(opcode >> (8 * length)))
        break;
 
@@ -1437,7 +1437,7 @@ output_i386_opcode (FILE *table, const char *name, char *str,
 	}
 
       if (prefix)
-	opcode &= (1UL << (8 * --length)) - 1;
+	opcode &= (1ULL << (8 * --length)) - 1;
     }
 
   /* Transform opcode space encoded in the opcode into opcode modifier
@@ -1454,10 +1454,14 @@ output_i386_opcode (FILE *table, const char *name, char *str,
       if (space != SPACE_0F && --length == 1)
 	fail (_("%s:%d: %s: unrecognized opcode encoding space\n"),
 	      filename, lineno, name);
-      opcode &= (1UL << (8 * --length)) - 1;
+      opcode &= (1ULL << (8 * --length)) - 1;
     }
 
-  fprintf (table, "  { \"%s\", 0x%0*lx%s, %s, %lu,\n",
+  if (length > 2)
+    fail (_("%s:%d: %s: residual opcode (0x%0*llx) too large\n"),
+	  filename, lineno, name, 2 * length, opcode);
+
+  fprintf (table, "  { \"%s\", 0x%0*llx%s, %s, %lu,\n",
 	   name, 2 * (int)length, opcode, end, extension_opcode, i);
 
   process_i386_opcode_modifier (table, opcode_modifier, space, prefix,