[AArch64][SVE 28/32] Add SVE FP immediate operands

This patch adds support for the new SVE floating-point immediate
operands.  One operand uses the same 8-bit encoding as base AArch64,
but in a different position.  The others use a single bit to select
between two values.

One of the single-bit operands is a choice between 0 and 1, where 0
is not a valid 8-bit encoding.  I think the cleanest way of handling
these single-bit immediates is therefore to use the IEEE float encoding
itself as the immediate value and select between the two possible values
when encoding and decoding.

As described in the covering note for the patch that added F_STRICT,
we get better error messages by accepting unsuffixed vector registers
and leaving the qualifier matching code to report an error.  This means
that we carry on parsing the other operands, and so can try to parse FP
immediates for invalid instructions like:

	fcpy	z0, #2.5

In this case there is no suffix to tell us whether the immediate should
be treated as single or double precision.  Again, we get better error
messages by picking one (arbitrary) immediate size and reporting an error
for the missing suffix later.

include/opcode/
	* aarch64.h (AARCH64_OPND_SVE_FPIMM8): New aarch64_opnd.
	(AARCH64_OPND_SVE_I1_HALF_ONE, AARCH64_OPND_SVE_I1_HALF_TWO)
	(AARCH64_OPND_SVE_I1_ZERO_ONE): Likewise.

opcodes/
	* aarch64-tbl.h (AARCH64_OPERANDS): Add entries for the new SVE FP
	immediate operands.
	* aarch64-opc.h (FLD_SVE_i1): New aarch64_field_kind.
	* aarch64-opc.c (fields): Add corresponding entry.
	(operand_general_constraint_met_p): Handle the new SVE FP immediate
	operands.
	(aarch64_print_operand): Likewise.
	* aarch64-opc-2.c: Regenerate.
	* aarch64-asm.h (ins_sve_float_half_one, ins_sve_float_half_two)
	(ins_sve_float_zero_one): New inserters.
	* aarch64-asm.c (aarch64_ins_sve_float_half_one): New function.
	(aarch64_ins_sve_float_half_two): Likewise.
	(aarch64_ins_sve_float_zero_one): Likewise.
	* aarch64-asm-2.c: Regenerate.
	* aarch64-dis.h (ext_sve_float_half_one, ext_sve_float_half_two)
	(ext_sve_float_zero_one): New extractors.
	* aarch64-dis.c (aarch64_ext_sve_float_half_one): New function.
	(aarch64_ext_sve_float_half_two): Likewise.
	(aarch64_ext_sve_float_zero_one): Likewise.
	* aarch64-dis-2.c: Regenerate.

gas/
	* config/tc-aarch64.c (double_precision_operand_p): New function.
	(parse_operands): Use it to calculate the dp_p input to
	parse_aarch64_imm_float.  Handle the new SVE FP immediate operands.

Change-Id: I8a8578992ede586391d4a0499000ea36e36c2b85

12 files changed, 258 insertions, 53 deletions

diff --git a/gas/config/tc-aarch64.c b/gas/config/tc-aarch64.c
index cb39cf8..eddc6f8 100644
--- a/gas/config/tc-aarch64.c
+++ b/gas/config/tc-aarch64.c
@@ -2252,6 +2252,20 @@ can_convert_double_to_float (uint64_t imm, uint32_t *fpword)
   return TRUE;
 }
 
+/* Return true if we should treat OPERAND as a double-precision
+   floating-point operand rather than a single-precision one.  */
+static bfd_boolean
+double_precision_operand_p (const aarch64_opnd_info *operand)
+{
+  /* Check for unsuffixed SVE registers, which are allowed
+     for LDR and STR but not in instructions that require an
+     immediate.  We get better error messages if we arbitrarily
+     pick one size, parse the immediate normally, and then
+     report the match failure in the normal way.  */
+  return (operand->qualifier == AARCH64_OPND_QLF_NIL
+	  || aarch64_get_qualifier_esize (operand->qualifier) == 8);
+}
+
 /* Parse a floating-point immediate.  Return TRUE on success and return the
    value in *IMMED in the format of IEEE754 single-precision encoding.
    *CCP points to the start of the string; DP_P is TRUE when the immediate
@@ -5707,11 +5721,12 @@ parse_operands (char *str, const aarch64_opcode *opcode)
 
 	case AARCH64_OPND_FPIMM:
 	case AARCH64_OPND_SIMD_FPIMM:
+	case AARCH64_OPND_SVE_FPIMM8:
 	  {
 	    int qfloat;
-	    bfd_boolean dp_p
-	      = (aarch64_get_qualifier_esize (inst.base.operands[0].qualifier)
-		 == 8);
+	    bfd_boolean dp_p;
+
+	    dp_p = double_precision_operand_p (&inst.base.operands[0]);
 	    if (!parse_aarch64_imm_float (&str, &qfloat, dp_p, imm_reg_type)
 		|| !aarch64_imm_float_p (qfloat))
 	      {
@@ -5725,6 +5740,26 @@ parse_operands (char *str, const aarch64_opcode *opcode)
 	  }
 	  break;
 
+	case AARCH64_OPND_SVE_I1_HALF_ONE:
+	case AARCH64_OPND_SVE_I1_HALF_TWO:
+	case AARCH64_OPND_SVE_I1_ZERO_ONE:
+	  {
+	    int qfloat;
+	    bfd_boolean dp_p;
+
+	    dp_p = double_precision_operand_p (&inst.base.operands[0]);
+	    if (!parse_aarch64_imm_float (&str, &qfloat, dp_p, imm_reg_type))
+	      {
+		if (!error_p ())
+		  set_fatal_syntax_error (_("invalid floating-point"
+					    " constant"));
+		goto failure;
+	      }
+	    inst.base.operands[i].imm.value = qfloat;
+	    inst.base.operands[i].imm.is_fp = 1;
+	  }
+	  break;
+
 	case AARCH64_OPND_LIMM:
 	  po_misc_or_fail (parse_shifter_operand (&str, info,
 						  SHIFTED_LOGIC_IMM));
diff --git a/include/opcode/aarch64.h b/include/opcode/aarch64.h
index 36e95b4..9e7f5b5 100644
--- a/include/opcode/aarch64.h
+++ b/include/opcode/aarch64.h
@@ -292,6 +292,10 @@ enum aarch64_opnd
   AARCH64_OPND_SVE_ADDR_ZZ_UXTW,    /* SVE [Zn.<T>, Zm,<T>, UXTW #<msz>].  */
   AARCH64_OPND_SVE_AIMM,	/* SVE unsigned arithmetic immediate.  */
   AARCH64_OPND_SVE_ASIMM,	/* SVE signed arithmetic immediate.  */
+  AARCH64_OPND_SVE_FPIMM8,	/* SVE 8-bit floating-point immediate.  */
+  AARCH64_OPND_SVE_I1_HALF_ONE,	/* SVE choice between 0.5 and 1.0.  */
+  AARCH64_OPND_SVE_I1_HALF_TWO,	/* SVE choice between 0.5 and 2.0.  */
+  AARCH64_OPND_SVE_I1_ZERO_ONE,	/* SVE choice between 0.0 and 1.0.  */
   AARCH64_OPND_SVE_INV_LIMM,	/* SVE inverted logical immediate.  */
   AARCH64_OPND_SVE_LIMM,	/* SVE logical immediate.  */
   AARCH64_OPND_SVE_LIMM_MOV,	/* SVE logical immediate for MOV.  */
diff --git a/opcodes/aarch64-asm-2.c b/opcodes/aarch64-asm-2.c
index 491ea53..d9d1981 100644
--- a/opcodes/aarch64-asm-2.c
+++ b/opcodes/aarch64-asm-2.c
@@ -480,21 +480,21 @@ aarch64_insert_operand (const aarch64_operand *self,
     case 27:
     case 35:
     case 36:
-    case 135:
-    case 136:
-    case 137:
-    case 138:
     case 139:
     case 140:
     case 141:
     case 142:
-    case 155:
-    case 156:
-    case 157:
-    case 158:
+    case 143:
+    case 144:
+    case 145:
+    case 146:
     case 159:
     case 160:
+    case 161:
+    case 162:
     case 163:
+    case 164:
+    case 167:
       return aarch64_ins_regno (self, info, code, inst);
     case 12:
       return aarch64_ins_reg_extended (self, info, code, inst);
@@ -532,16 +532,16 @@ aarch64_insert_operand (const aarch64_operand *self,
     case 69:
     case 70:
     case 71:
-    case 132:
-    case 134:
-    case 147:
-    case 148:
-    case 149:
-    case 150:
+    case 136:
+    case 138:
     case 151:
     case 152:
     case 153:
     case 154:
+    case 155:
+    case 156:
+    case 157:
+    case 158:
       return aarch64_ins_imm (self, info, code, inst);
     case 38:
     case 39:
@@ -551,9 +551,10 @@ aarch64_insert_operand (const aarch64_operand *self,
     case 42:
       return aarch64_ins_advsimd_imm_modified (self, info, code, inst);
     case 46:
+    case 129:
       return aarch64_ins_fpimm (self, info, code, inst);
     case 60:
-    case 130:
+    case 134:
       return aarch64_ins_limm (self, info, code, inst);
     case 61:
       return aarch64_ins_aimm (self, info, code, inst);
@@ -644,22 +645,28 @@ aarch64_insert_operand (const aarch64_operand *self,
       return aarch64_ins_sve_aimm (self, info, code, inst);
     case 128:
       return aarch64_ins_sve_asimm (self, info, code, inst);
-    case 129:
-      return aarch64_ins_inv_limm (self, info, code, inst);
+    case 130:
+      return aarch64_ins_sve_float_half_one (self, info, code, inst);
     case 131:
-      return aarch64_ins_sve_limm_mov (self, info, code, inst);
+      return aarch64_ins_sve_float_half_two (self, info, code, inst);
+    case 132:
+      return aarch64_ins_sve_float_zero_one (self, info, code, inst);
     case 133:
+      return aarch64_ins_inv_limm (self, info, code, inst);
+    case 135:
+      return aarch64_ins_sve_limm_mov (self, info, code, inst);
+    case 137:
       return aarch64_ins_sve_scale (self, info, code, inst);
-    case 143:
-    case 144:
+    case 147:
+    case 148:
       return aarch64_ins_sve_shlimm (self, info, code, inst);
-    case 145:
-    case 146:
+    case 149:
+    case 150:
       return aarch64_ins_sve_shrimm (self, info, code, inst);
-    case 161:
+    case 165:
       return aarch64_ins_sve_index (self, info, code, inst);
-    case 162:
-    case 164:
+    case 166:
+    case 168:
       return aarch64_ins_sve_reglist (self, info, code, inst);
     default: assert (0); abort ();
     }
diff --git a/opcodes/aarch64-asm.c b/opcodes/aarch64-asm.c
index 61d0d95..fd356f4 100644
--- a/opcodes/aarch64-asm.c
+++ b/opcodes/aarch64-asm.c
@@ -1028,6 +1028,51 @@ aarch64_ins_sve_shrimm (const aarch64_operand *self,
   return NULL;
 }
 
+/* Encode a single-bit immediate that selects between #0.5 and #1.0.
+   The fields array specifies which field to use.  */
+const char *
+aarch64_ins_sve_float_half_one (const aarch64_operand *self,
+				const aarch64_opnd_info *info,
+				aarch64_insn *code,
+				const aarch64_inst *inst ATTRIBUTE_UNUSED)
+{
+  if (info->imm.value == 0x3f000000)
+    insert_field (self->fields[0], code, 0, 0);
+  else
+    insert_field (self->fields[0], code, 1, 0);
+  return NULL;
+}
+
+/* Encode a single-bit immediate that selects between #0.5 and #2.0.
+   The fields array specifies which field to use.  */
+const char *
+aarch64_ins_sve_float_half_two (const aarch64_operand *self,
+				const aarch64_opnd_info *info,
+				aarch64_insn *code,
+				const aarch64_inst *inst ATTRIBUTE_UNUSED)
+{
+  if (info->imm.value == 0x3f000000)
+    insert_field (self->fields[0], code, 0, 0);
+  else
+    insert_field (self->fields[0], code, 1, 0);
+  return NULL;
+}
+
+/* Encode a single-bit immediate that selects between #0.0 and #1.0.
+   The fields array specifies which field to use.  */
+const char *
+aarch64_ins_sve_float_zero_one (const aarch64_operand *self,
+				const aarch64_opnd_info *info,
+				aarch64_insn *code,
+				const aarch64_inst *inst ATTRIBUTE_UNUSED)
+{
+  if (info->imm.value == 0)
+    insert_field (self->fields[0], code, 0, 0);
+  else
+    insert_field (self->fields[0], code, 1, 0);
+  return NULL;
+}
+
 /* Miscellaneous encoding functions.  */
 
 /* Encode size[0], i.e. bit 22, for
diff --git a/opcodes/aarch64-asm.h b/opcodes/aarch64-asm.h
index bbd320eb..0cce71c 100644
--- a/opcodes/aarch64-asm.h
+++ b/opcodes/aarch64-asm.h
@@ -82,6 +82,9 @@ AARCH64_DECL_OPD_INSERTER (ins_sve_addr_zz_sxtw);
 AARCH64_DECL_OPD_INSERTER (ins_sve_addr_zz_uxtw);
 AARCH64_DECL_OPD_INSERTER (ins_sve_aimm);
 AARCH64_DECL_OPD_INSERTER (ins_sve_asimm);
+AARCH64_DECL_OPD_INSERTER (ins_sve_float_half_one);
+AARCH64_DECL_OPD_INSERTER (ins_sve_float_half_two);
+AARCH64_DECL_OPD_INSERTER (ins_sve_float_zero_one);
 AARCH64_DECL_OPD_INSERTER (ins_sve_index);
 AARCH64_DECL_OPD_INSERTER (ins_sve_limm_mov);
 AARCH64_DECL_OPD_INSERTER (ins_sve_reglist);
diff --git a/opcodes/aarch64-dis-2.c b/opcodes/aarch64-dis-2.c
index 4527456..110cf2e 100644
--- a/opcodes/aarch64-dis-2.c
+++ b/opcodes/aarch64-dis-2.c
@@ -10426,21 +10426,21 @@ aarch64_extract_operand (const aarch64_operand *self,
     case 27:
     case 35:
     case 36:
-    case 135:
-    case 136:
-    case 137:
-    case 138:
     case 139:
     case 140:
     case 141:
     case 142:
-    case 155:
-    case 156:
-    case 157:
-    case 158:
+    case 143:
+    case 144:
+    case 145:
+    case 146:
     case 159:
     case 160:
+    case 161:
+    case 162:
     case 163:
+    case 164:
+    case 167:
       return aarch64_ext_regno (self, info, code, inst);
     case 8:
       return aarch64_ext_regrt_sysins (self, info, code, inst);
@@ -10483,16 +10483,16 @@ aarch64_extract_operand (const aarch64_operand *self,
     case 69:
     case 70:
     case 71:
-    case 132:
-    case 134:
-    case 147:
-    case 148:
-    case 149:
-    case 150:
+    case 136:
+    case 138:
     case 151:
     case 152:
     case 153:
     case 154:
+    case 155:
+    case 156:
+    case 157:
+    case 158:
       return aarch64_ext_imm (self, info, code, inst);
     case 38:
     case 39:
@@ -10504,9 +10504,10 @@ aarch64_extract_operand (const aarch64_operand *self,
     case 43:
       return aarch64_ext_shll_imm (self, info, code, inst);
     case 46:
+    case 129:
       return aarch64_ext_fpimm (self, info, code, inst);
     case 60:
-    case 130:
+    case 134:
       return aarch64_ext_limm (self, info, code, inst);
     case 61:
       return aarch64_ext_aimm (self, info, code, inst);
@@ -10597,22 +10598,28 @@ aarch64_extract_operand (const aarch64_operand *self,
       return aarch64_ext_sve_aimm (self, info, code, inst);
     case 128:
       return aarch64_ext_sve_asimm (self, info, code, inst);
-    case 129:
-      return aarch64_ext_inv_limm (self, info, code, inst);
+    case 130:
+      return aarch64_ext_sve_float_half_one (self, info, code, inst);
     case 131:
-      return aarch64_ext_sve_limm_mov (self, info, code, inst);
+      return aarch64_ext_sve_float_half_two (self, info, code, inst);
+    case 132:
+      return aarch64_ext_sve_float_zero_one (self, info, code, inst);
     case 133:
+      return aarch64_ext_inv_limm (self, info, code, inst);
+    case 135:
+      return aarch64_ext_sve_limm_mov (self, info, code, inst);
+    case 137:
       return aarch64_ext_sve_scale (self, info, code, inst);
-    case 143:
-    case 144:
+    case 147:
+    case 148:
       return aarch64_ext_sve_shlimm (self, info, code, inst);
-    case 145:
-    case 146:
+    case 149:
+    case 150:
       return aarch64_ext_sve_shrimm (self, info, code, inst);
-    case 161:
+    case 165:
       return aarch64_ext_sve_index (self, info, code, inst);
-    case 162:
-    case 164:
+    case 166:
+    case 168:
       return aarch64_ext_sve_reglist (self, info, code, inst);
     default: assert (0); abort ();
     }
diff --git a/opcodes/aarch64-dis.c b/opcodes/aarch64-dis.c
index ed050cd..385286c 100644
--- a/opcodes/aarch64-dis.c
+++ b/opcodes/aarch64-dis.c
@@ -1465,6 +1465,51 @@ aarch64_ext_sve_asimm (const aarch64_operand *self,
 	  && decode_sve_aimm (info, (int8_t) info->imm.value));
 }
 
+/* Decode a single-bit immediate that selects between #0.5 and #1.0.
+   The fields array specifies which field to use.  */
+int
+aarch64_ext_sve_float_half_one (const aarch64_operand *self,
+				aarch64_opnd_info *info, aarch64_insn code,
+				const aarch64_inst *inst ATTRIBUTE_UNUSED)
+{
+  if (extract_field (self->fields[0], code, 0))
+    info->imm.value = 0x3f800000;
+  else
+    info->imm.value = 0x3f000000;
+  info->imm.is_fp = TRUE;
+  return 1;
+}
+
+/* Decode a single-bit immediate that selects between #0.5 and #2.0.
+   The fields array specifies which field to use.  */
+int
+aarch64_ext_sve_float_half_two (const aarch64_operand *self,
+				aarch64_opnd_info *info, aarch64_insn code,
+				const aarch64_inst *inst ATTRIBUTE_UNUSED)
+{
+  if (extract_field (self->fields[0], code, 0))
+    info->imm.value = 0x40000000;
+  else
+    info->imm.value = 0x3f000000;
+  info->imm.is_fp = TRUE;
+  return 1;
+}
+
+/* Decode a single-bit immediate that selects between #0.0 and #1.0.
+   The fields array specifies which field to use.  */
+int
+aarch64_ext_sve_float_zero_one (const aarch64_operand *self,
+				aarch64_opnd_info *info, aarch64_insn code,
+				const aarch64_inst *inst ATTRIBUTE_UNUSED)
+{
+  if (extract_field (self->fields[0], code, 0))
+    info->imm.value = 0x3f800000;
+  else
+    info->imm.value = 0x0;
+  info->imm.is_fp = TRUE;
+  return 1;
+}
+
 /* Decode Zn[MM], where MM has a 7-bit triangular encoding.  The fields
    array specifies which field to use for Zn.  MM is encoded in the
    concatenation of imm5 and SVE_tszh, with imm5 being the less
diff --git a/opcodes/aarch64-dis.h b/opcodes/aarch64-dis.h
index 10983d1..474bc45 100644
--- a/opcodes/aarch64-dis.h
+++ b/opcodes/aarch64-dis.h
@@ -104,6 +104,9 @@ AARCH64_DECL_OPD_EXTRACTOR (ext_sve_addr_zz_sxtw);
 AARCH64_DECL_OPD_EXTRACTOR (ext_sve_addr_zz_uxtw);
 AARCH64_DECL_OPD_EXTRACTOR (ext_sve_aimm);
 AARCH64_DECL_OPD_EXTRACTOR (ext_sve_asimm);
+AARCH64_DECL_OPD_EXTRACTOR (ext_sve_float_half_one);
+AARCH64_DECL_OPD_EXTRACTOR (ext_sve_float_half_two);
+AARCH64_DECL_OPD_EXTRACTOR (ext_sve_float_zero_one);
 AARCH64_DECL_OPD_EXTRACTOR (ext_sve_index);
 AARCH64_DECL_OPD_EXTRACTOR (ext_sve_limm_mov);
 AARCH64_DECL_OPD_EXTRACTOR (ext_sve_reglist);
diff --git a/opcodes/aarch64-opc-2.c b/opcodes/aarch64-opc-2.c
index d86e7dc..58c3aed 100644
--- a/opcodes/aarch64-opc-2.c
+++ b/opcodes/aarch64-opc-2.c
@@ -153,6 +153,10 @@ const struct aarch64_operand aarch64_operands[] =
   {AARCH64_OPND_CLASS_ADDRESS, "SVE_ADDR_ZZ_UXTW", OPD_F_HAS_INSERTER | OPD_F_HAS_EXTRACTOR, {FLD_SVE_Zn,FLD_SVE_Zm_16}, "an address with a vector register offset"},
   {AARCH64_OPND_CLASS_IMMEDIATE, "SVE_AIMM", OPD_F_HAS_INSERTER | OPD_F_HAS_EXTRACTOR, {FLD_SVE_imm9}, "a 9-bit unsigned arithmetic operand"},
   {AARCH64_OPND_CLASS_IMMEDIATE, "SVE_ASIMM", OPD_F_HAS_INSERTER | OPD_F_HAS_EXTRACTOR, {FLD_SVE_imm9}, "a 9-bit signed arithmetic operand"},
+  {AARCH64_OPND_CLASS_IMMEDIATE, "SVE_FPIMM8", OPD_F_HAS_INSERTER | OPD_F_HAS_EXTRACTOR, {FLD_SVE_imm8}, "an 8-bit floating-point immediate"},
+  {AARCH64_OPND_CLASS_IMMEDIATE, "SVE_I1_HALF_ONE", OPD_F_HAS_INSERTER | OPD_F_HAS_EXTRACTOR, {FLD_SVE_i1}, "either 0.5 or 1.0"},
+  {AARCH64_OPND_CLASS_IMMEDIATE, "SVE_I1_HALF_TWO", OPD_F_HAS_INSERTER | OPD_F_HAS_EXTRACTOR, {FLD_SVE_i1}, "either 0.5 or 2.0"},
+  {AARCH64_OPND_CLASS_IMMEDIATE, "SVE_I1_ZERO_ONE", OPD_F_HAS_INSERTER | OPD_F_HAS_EXTRACTOR, {FLD_SVE_i1}, "either 0.0 or 1.0"},
   {AARCH64_OPND_CLASS_IMMEDIATE, "SVE_INV_LIMM", OPD_F_HAS_INSERTER | OPD_F_HAS_EXTRACTOR, {FLD_SVE_N,FLD_SVE_immr,FLD_SVE_imms}, "an inverted 13-bit logical immediate"},
   {AARCH64_OPND_CLASS_IMMEDIATE, "SVE_LIMM", OPD_F_HAS_INSERTER | OPD_F_HAS_EXTRACTOR, {FLD_SVE_N,FLD_SVE_immr,FLD_SVE_imms}, "a 13-bit logical immediate"},
   {AARCH64_OPND_CLASS_IMMEDIATE, "SVE_LIMM_MOV", OPD_F_HAS_INSERTER | OPD_F_HAS_EXTRACTOR, {FLD_SVE_N,FLD_SVE_immr,FLD_SVE_imms}, "a 13-bit logical move immediate"},
diff --git a/opcodes/aarch64-opc.c b/opcodes/aarch64-opc.c
index dec7e06..3b0279c 100644
--- a/opcodes/aarch64-opc.c
+++ b/opcodes/aarch64-opc.c
@@ -280,6 +280,7 @@ const aarch64_field fields[] =
     { 16,  5 }, /* SVE_Zm_16: SVE vector register, bits [20,16]. */
     {  5,  5 }, /* SVE_Zn: SVE vector register, bits [9,5].  */
     {  0,  5 }, /* SVE_Zt: SVE vector register, bits [4,0].  */
+    {  5,  1 }, /* SVE_i1: single-bit immediate.  */
     { 16,  3 }, /* SVE_imm3: 3-bit immediate field.  */
     { 16,  4 }, /* SVE_imm4: 4-bit immediate field.  */
     {  5,  5 }, /* SVE_imm5: 5-bit immediate field.  */
@@ -2178,6 +2179,7 @@ operand_general_constraint_met_p (const aarch64_opnd_info *opnds, int idx,
 
 	case AARCH64_OPND_FPIMM:
 	case AARCH64_OPND_SIMD_FPIMM:
+	case AARCH64_OPND_SVE_FPIMM8:
 	  if (opnd->imm.is_fp == 0)
 	    {
 	      set_other_error (mismatch_detail, idx,
@@ -2254,6 +2256,36 @@ operand_general_constraint_met_p (const aarch64_opnd_info *opnds, int idx,
 	  min_value = -128;
 	  goto sve_aimm;
 
+	case AARCH64_OPND_SVE_I1_HALF_ONE:
+	  assert (opnd->imm.is_fp);
+	  if (opnd->imm.value != 0x3f000000 && opnd->imm.value != 0x3f800000)
+	    {
+	      set_other_error (mismatch_detail, idx,
+			       _("floating-point value must be 0.5 or 1.0"));
+	      return 0;
+	    }
+	  break;
+
+	case AARCH64_OPND_SVE_I1_HALF_TWO:
+	  assert (opnd->imm.is_fp);
+	  if (opnd->imm.value != 0x3f000000 && opnd->imm.value != 0x40000000)
+	    {
+	      set_other_error (mismatch_detail, idx,
+			       _("floating-point value must be 0.5 or 2.0"));
+	      return 0;
+	    }
+	  break;
+
+	case AARCH64_OPND_SVE_I1_ZERO_ONE:
+	  assert (opnd->imm.is_fp);
+	  if (opnd->imm.value != 0 && opnd->imm.value != 0x3f800000)
+	    {
+	      set_other_error (mismatch_detail, idx,
+			       _("floating-point value must be 0.0 or 1.0"));
+	      return 0;
+	    }
+	  break;
+
 	case AARCH64_OPND_SVE_INV_LIMM:
 	  {
 	    int esize = aarch64_get_qualifier_esize (opnds[0].qualifier);
@@ -3105,6 +3137,16 @@ aarch64_print_operand (char *buf, size_t size, bfd_vma pc,
       snprintf (buf, size, "#%" PRIi64, opnd->imm.value);
       break;
 
+    case AARCH64_OPND_SVE_I1_HALF_ONE:
+    case AARCH64_OPND_SVE_I1_HALF_TWO:
+    case AARCH64_OPND_SVE_I1_ZERO_ONE:
+      {
+	single_conv_t c;
+	c.i = opnd->imm.value;
+	snprintf (buf, size, "#%.1f", c.f);
+	break;
+      }
+
     case AARCH64_OPND_SVE_PATTERN:
       if (optional_operand_p (opcode, idx)
 	  && opnd->imm.value == get_optional_operand_default_value (opcode))
@@ -3202,6 +3244,7 @@ aarch64_print_operand (char *buf, size_t size, bfd_vma pc,
 
     case AARCH64_OPND_FPIMM:
     case AARCH64_OPND_SIMD_FPIMM:
+    case AARCH64_OPND_SVE_FPIMM8:
       switch (aarch64_get_qualifier_esize (opnds[0].qualifier))
 	{
 	case 2:	/* e.g. FMOV <Hd>, #<imm>.  */
diff --git a/opcodes/aarch64-opc.h b/opcodes/aarch64-opc.h
index 087376e..6c67786 100644
--- a/opcodes/aarch64-opc.h
+++ b/opcodes/aarch64-opc.h
@@ -107,6 +107,7 @@ enum aarch64_field_kind
   FLD_SVE_Zm_16,
   FLD_SVE_Zn,
   FLD_SVE_Zt,
+  FLD_SVE_i1,
   FLD_SVE_imm3,
   FLD_SVE_imm4,
   FLD_SVE_imm5,
diff --git a/opcodes/aarch64-tbl.h b/opcodes/aarch64-tbl.h
index d743e3b..562eea7 100644
--- a/opcodes/aarch64-tbl.h
+++ b/opcodes/aarch64-tbl.h
@@ -2931,6 +2931,14 @@ struct aarch64_opcode aarch64_opcode_table[] =
       "a 9-bit unsigned arithmetic operand")				\
     Y(IMMEDIATE, sve_asimm, "SVE_ASIMM", 0, F(FLD_SVE_imm9),		\
       "a 9-bit signed arithmetic operand")				\
+    Y(IMMEDIATE, fpimm, "SVE_FPIMM8", 0, F(FLD_SVE_imm8),		\
+      "an 8-bit floating-point immediate")				\
+    Y(IMMEDIATE, sve_float_half_one, "SVE_I1_HALF_ONE", 0,		\
+      F(FLD_SVE_i1), "either 0.5 or 1.0")				\
+    Y(IMMEDIATE, sve_float_half_two, "SVE_I1_HALF_TWO", 0,		\
+      F(FLD_SVE_i1), "either 0.5 or 2.0")				\
+    Y(IMMEDIATE, sve_float_zero_one, "SVE_I1_ZERO_ONE", 0,		\
+      F(FLD_SVE_i1), "either 0.0 or 1.0")				\
     Y(IMMEDIATE, inv_limm, "SVE_INV_LIMM", 0,				\
       F(FLD_SVE_N,FLD_SVE_immr,FLD_SVE_imms),				\
       "an inverted 13-bit logical immediate")				\