arc: Replace ARC_SHORT macro with arc_opcode_len function

In preparation for moving to a world where arc instructions can be 2, 4,
6, or 8 bytes in length, replace the ARC_SHORT macro (which is either
true of false) with an arc_opcode_len function that returns a length in
bytes.

There should be no functional change after this commit.

gas/ChangeLog:

	* config/tc-arc.c (assemble_insn): Replace use of ARC_SHORT with
	arc_opcode_len.

include/ChangeLog:

	* opcode/arc.h (arc_opcode_len): Declare.
	(ARC_SHORT): Delete.

opcodes/ChangeLog:

	* arc-dis.c (find_format_from_table): Replace use of ARC_SHORT
	with arc_opcode_len.
	(find_format_long_instructions): Likewise.
	* arc-opc.c (arc_opcode_len): New function.

7 files changed, 38 insertions, 10 deletions

diff --git a/gas/ChangeLog b/gas/ChangeLog
index d7aa0c1..63a885b 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,5 +1,10 @@
 2016-11-03  Graham Markall  <graham.markall@embecosm.com>
 
+	* config/tc-arc.c (assemble_insn): Replace use of ARC_SHORT with
+	arc_opcode_len.
+
+2016-11-03  Graham Markall  <graham.markall@embecosm.com>
+
 	* config/tc-arc.c (struct arc_insn): Replace short_insn flag with
 	len field.
 	(apply_fixups): Update to use len field.
diff --git a/gas/config/tc-arc.c b/gas/config/tc-arc.c
index 5ced8f0..69dad38 100644
--- a/gas/config/tc-arc.c
+++ b/gas/config/tc-arc.c
@@ -3879,7 +3879,8 @@ assemble_insn (const struct arc_opcode *opcode,
 	      break;
 	    case O_pcl:
 	      reloc = ARC_RELOC_TABLE (t->X_md)->reloc;
-	      if (ARC_SHORT (opcode->mask) || opcode->insn_class == JUMP)
+	      if (arc_opcode_len (opcode) == 2
+		  || opcode->insn_class == JUMP)
 		as_bad_where (frag_now->fr_file, frag_now->fr_line,
 			      _("Unable to use @pcl relocation for insn %s"),
 			      opcode->name);
@@ -4011,7 +4012,8 @@ assemble_insn (const struct arc_opcode *opcode,
   insn->relax = relax_insn_p (opcode, tok, ntok, pflags, nflg);
 
   /* Instruction length.  */
-  insn->len = ARC_SHORT (opcode->mask) ? 2 : 4;
+  insn->len = arc_opcode_len (opcode);
+  gas_assert (insn->len == 2 || insn->len == 4);
 
   insn->insn = image;
 
diff --git a/include/ChangeLog b/include/ChangeLog
index c4ddcb2..e21ad35 100644
--- a/include/ChangeLog
+++ b/include/ChangeLog
@@ -1,3 +1,8 @@
+2016-11-03  Graham Markall  <graham.markall@embecosm.com>
+
+	* opcode/arc.h (arc_opcode_len): Declare.
+	(ARC_SHORT): Delete.
+
 2016-11-01  Palmer Dabbelt  <palmer@dabbelt.com>
 	    Andrew Waterman <andrew@sifive.com>
 
diff --git a/include/opcode/arc.h b/include/opcode/arc.h
index 724fdee..34a7fa7 100644
--- a/include/opcode/arc.h
+++ b/include/opcode/arc.h
@@ -175,6 +175,9 @@ extern const unsigned arc_num_long_opcodes;
    instructions.  */
 extern const struct arc_opcode arc_opcodes[];
 
+/* Return length of an instruction represented by OPCODE, in bytes.  */
+extern int arc_opcode_len (const struct arc_opcode *opcode);
+
 /* CPU Availability.  */
 #define ARC_OPCODE_NONE     0x0000
 #define ARC_OPCODE_ARC600   0x0001  /* ARC 600 specific insns.  */
@@ -228,10 +231,6 @@ extern const struct arc_opcode arc_opcodes[];
 #define ARC_XMAC     0x1000
 #define ARC_CRC      0x1000
 
-/* A macro to check for short instructions.  */
-#define ARC_SHORT(mask)				\
-  (((mask) & 0xFFFF0000) ? 0 : 1)
-
 /* The operands table is an array of struct arc_operand.  */
 struct arc_operand
 {
diff --git a/opcodes/ChangeLog b/opcodes/ChangeLog
index 31809b4..634ad27 100644
--- a/opcodes/ChangeLog
+++ b/opcodes/ChangeLog
@@ -1,3 +1,10 @@
+2016-11-03  Graham Markall  <graham.markall@embecosm.com>
+
+	* arc-dis.c (find_format_from_table): Replace use of ARC_SHORT
+	with arc_opcode_len.
+	(find_format_long_instructions): Likewise.
+	* arc-opc.c (arc_opcode_len): New function.
+
 2016-11-03  Andrew Burgess  <andrew.burgess@embecosm.com>
 
 	* arc-nps400-tbl.h: Fix some instruction masks.
diff --git a/opcodes/arc-dis.c b/opcodes/arc-dis.c
index 898512c..a1aaf34 100644
--- a/opcodes/arc-dis.c
+++ b/opcodes/arc-dis.c
@@ -272,12 +272,12 @@ find_format_from_table (struct disassemble_info *info,
 
       opcode = &arc_table[i++];
 
-      if (ARC_SHORT (opcode->mask) && (insn_len == 2))
+      if ((arc_opcode_len (opcode) == 2) && (insn_len == 2))
 	{
 	  if (OPCODE_AC (opcode->opcode) != OPCODE_AC (insn[0]))
 	    continue;
 	}
-      else if (!ARC_SHORT (opcode->mask) && (insn_len == 4))
+      else if ((arc_opcode_len (opcode) == 4) && (insn_len == 4))
 	{
 	  if (OPCODE (opcode->opcode) != OPCODE (insn[0]))
 	    continue;
@@ -400,12 +400,12 @@ find_format_long_instructions (unsigned *insn,
 
       opcode = &arc_long_opcodes[i].base_opcode;
 
-      if (ARC_SHORT (opcode->mask) && (*insn_len == 2))
+      if ((arc_opcode_len (opcode) == 2) && (*insn_len == 2))
         {
           if (OPCODE_AC (opcode->opcode) != OPCODE_AC (insn[0]))
             continue;
         }
-      else if (!ARC_SHORT (opcode->mask) && (*insn_len == 4))
+      else if ((arc_opcode_len (opcode) == 4) && (*insn_len == 4))
         {
           if (OPCODE (opcode->opcode) != OPCODE (insn[0]))
             continue;
diff --git a/opcodes/arc-opc.c b/opcodes/arc-opc.c
index 6537310..9eb58d3 100644
--- a/opcodes/arc-opc.c
+++ b/opcodes/arc-opc.c
@@ -2648,3 +2648,13 @@ const struct arc_long_opcode arc_long_opcodes[] =
 };
 
 const unsigned arc_num_long_opcodes = ARRAY_SIZE (arc_long_opcodes);
+
+/* Return length of instruction represented by OPCODE in bytes.  */
+
+int
+arc_opcode_len (const struct arc_opcode *opcode)
+{
+  if (opcode->mask < 0x10000ull)
+    return 2;
+  return 4;
+}