[PATCH 11/16] [binutils][aarch64] New sve_shift_tsz_bhsd iclass.

[Matthew Malcomson <Matthew.Malcomson@arm.com>]

This new iclass encodes the variant by which is the most significant bit
used of bits 23-22:20-19, where those bits are usually part of a
given constant operand.

include/ChangeLog:

2019-04-04  Matthew Malcomson  <matthew.malcomson@arm.com>

	* opcode/aarch64.h (enum aarch64_insn_class): Add sve_shift_tsz_bhsd
	iclass.

opcodes/ChangeLog:

2019-04-04  Matthew Malcomson  <matthew.malcomson@arm.com>

	* aarch64-asm.c (aarch64_encode_variant_using_iclass): Handle
	sve_shift_tsz_bhsd iclass encode.
	* aarch64-dis.c (aarch64_decode_variant_using_iclass): Handle
	sve_shift_tsz_bhsd iclass decode.
---
 include/opcode/aarch64.h |  1 +
 opcodes/aarch64-asm.c    |  1 +
 opcodes/aarch64-dis.c    | 11 +++++++++++
 3 files changed, 13 insertions(+)

diff --git a/include/opcode/aarch64.h b/include/opcode/aarch64.h
index ce9955d..285af27 100644
--- a/include/opcode/aarch64.h
+++ b/include/opcode/aarch64.h
@@ -595,6 +595,7 @@ enum aarch64_insn_class
   sve_size_sd2,
   sve_size_013,
   sve_shift_tsz_hsd,
+  sve_shift_tsz_bhsd,
   testbranch,
   cryptosm3,
   cryptosm4,
diff --git a/opcodes/aarch64-asm.c b/opcodes/aarch64-asm.c
index 6be17f9..ad50598 100644
--- a/opcodes/aarch64-asm.c
+++ b/opcodes/aarch64-asm.c
@@ -1626,6 +1626,7 @@ aarch64_encode_variant_using_iclass (struct aarch64_inst *inst)
     case sve_shift_pred:
     case sve_shift_unpred:
     case sve_shift_tsz_hsd:
+    case sve_shift_tsz_bhsd:
       /* For indices and shift amounts, the variant is encoded as
 	 part of the immediate.  */
       break;
diff --git a/opcodes/aarch64-dis.c b/opcodes/aarch64-dis.c
index 5571ab6..b42e4d5 100644
--- a/opcodes/aarch64-dis.c
+++ b/opcodes/aarch64-dis.c
@@ -2832,6 +2832,17 @@ aarch64_decode_variant_using_iclass (aarch64_inst *inst)
 	variant = i;
       break;
 
+    case sve_shift_tsz_bhsd:
+      i = extract_fields (inst->value, 0, 2, FLD_SVE_tszh, FLD_SVE_tszl_19);
+      if (i == 0)
+	return FALSE;
+      while (i != 1)
+	{
+	  i >>= 1;
+	  variant += 1;
+	}
+      break;
+
     case sve_shift_tsz_hsd:
       i = extract_fields (inst->value, 0, 2, FLD_SVE_sz, FLD_SVE_tszl_19);
       if (i == 0)
-- 
2.7.4