RISC-V/zfh: Add half-precision floating-point v0.1 instructions.

This patch is porting from the following riscv github,
https://github.com/riscv/riscv-binutils-gdb/commits/rvv-1.0.x-zfh

And here is the draft zfh spec,
https://github.com/riscv/riscv-isa-manual/tree/zfh

bfd/
	* elfxx-riscv.c (riscv_supported_std_z_ext): Added zfh.
	(riscv_implicit_subset): Add implicit f and zicsr for zfh.
gas/
	* config/tc-riscv.c (riscv_extended_subset_supports): Handle
	INSN_CLASS*_ZFH.
	(extended_macro): Handle M_FLH and M_FSH.
	* testsuite/gas/riscv/extended/extended.exp: Updated.
	* testsuite/gas/riscv/extended/fp-zfh-insns.d: New testcase.
	* testsuite/gas/riscv/extended/fp-zfh-insns.s: Likewise.
include/
	* opcode/riscv-opc-extended.h: Added zfh encoding macros
	and DECLARE_INSN.
	* opcode/riscv.h (enum riscv_extended_insn_class): Added INSN_CLASS*_ZFH.
	(enum M_FLH, M_FSH): Added.
opcodes/
	* riscv-opc.c (riscv_draft_opcodes): Added zfh instructions.

8 files changed, 344 insertions, 0 deletions

diff --git a/bfd/elfxx-riscv.c b/bfd/elfxx-riscv.c
index 34fd0e3b7d2..154b306ec4f 100644
--- a/bfd/elfxx-riscv.c
+++ b/bfd/elfxx-riscv.c
@@ -1075,6 +1075,8 @@ static struct riscv_implicit_subset riscv_implicit_subsets[] =
   {"q", "d",		check_implicit_always},
   {"d", "f",		check_implicit_always},
   {"f", "zicsr",	check_implicit_always},
+  {"zfh", "f",		check_implicit_always},
+  {"zfh", "zicsr",	check_implicit_always},
   {NULL, NULL, NULL}
 };
 
@@ -1148,6 +1150,7 @@ static struct riscv_supported_ext riscv_supported_std_z_ext[] =
   {"zbs",               ISA_SPEC_CLASS_DRAFT,           1, 0,  0 },
   {"zvamo",		ISA_SPEC_CLASS_DRAFT,		0, 10, 0 },	/* draft.  */
   {"zvlsseg",		ISA_SPEC_CLASS_DRAFT,		0, 10, 0 },	/* draft.  */
+  {"zfh",		ISA_SPEC_CLASS_DRAFT,		0, 1,  0 },	/* draft.  */
   {NULL, 0, 0, 0, 0}
 };
 
diff --git a/gas/config/tc-riscv.c b/gas/config/tc-riscv.c
index 6ddb7102820..ad50eda5ff3 100644
--- a/gas/config/tc-riscv.c
+++ b/gas/config/tc-riscv.c
@@ -281,6 +281,13 @@ riscv_extended_subset_supports (int insn_class)
     case INSN_CLASS_V_OR_ZVLSSEG:
       return (riscv_subset_supports ("v")
 	      || riscv_subset_supports ("zvlsseg"));
+
+    case INSN_CLASS_ZFH:
+      return riscv_subset_supports ("zfh");
+    case INSN_CLASS_D_AND_ZFH:
+      return riscv_subset_supports ("d") && riscv_subset_supports ("zfh");
+    case INSN_CLASS_Q_AND_ZFH:
+      return riscv_subset_supports ("q") && riscv_subset_supports ("zfh");
     default:
       as_fatal ("internal: unknown INSN_CLASS (0x%x)", insn_class);
       return false;
@@ -1935,6 +1942,10 @@ extended_macro (struct riscv_cl_insn *ip,
 		expressionS *imm_expr ATTRIBUTE_UNUSED,
 		bfd_reloc_code_real_type *imm_reloc ATTRIBUTE_UNUSED)
 {
+  int rd = (ip->insn_opcode >> OP_SH_RD) & OP_MASK_RD;
+  int rs1 = (ip->insn_opcode >> OP_SH_RS1) & OP_MASK_RS1;
+  int rs2 = (ip->insn_opcode >> OP_SH_RS2) & OP_MASK_RS2;
+
   switch (mask)
     {
     case M_VMSGE:
@@ -1942,6 +1953,15 @@ extended_macro (struct riscv_cl_insn *ip,
       vector_macro (ip);
       break;
 
+    case M_FLH:
+      pcrel_load (rd, rs1, imm_expr, "flh",
+		  BFD_RELOC_RISCV_PCREL_HI20, BFD_RELOC_RISCV_PCREL_LO12_I);
+      break;
+    case M_FSH:
+      pcrel_store (rs2, rs1, imm_expr, "fsh",
+		   BFD_RELOC_RISCV_PCREL_HI20, BFD_RELOC_RISCV_PCREL_LO12_S);
+      break;
+
     default:
       return false;
     }
diff --git a/gas/testsuite/gas/riscv/extended/extended.exp b/gas/testsuite/gas/riscv/extended/extended.exp
index 3966ef87836..3ad8833ea84 100644
--- a/gas/testsuite/gas/riscv/extended/extended.exp
+++ b/gas/testsuite/gas/riscv/extended/extended.exp
@@ -31,6 +31,7 @@ if [istarget riscv*-*-*] {
     run_dump_tests "vector-insns-fail-mask"
     run_dump_tests "vector-insns-fail-permutation"
     run_dump_tests "vector-insns-fail-zvamo"
+    run_dump_tests "fp-zfh-insns"
 
     run_dump_tests "extended-csr"
 }
diff --git a/gas/testsuite/gas/riscv/extended/fp-zfh-insns.d b/gas/testsuite/gas/riscv/extended/fp-zfh-insns.d
new file mode 100644
index 00000000000..a0bb06912bc
--- /dev/null
+++ b/gas/testsuite/gas/riscv/extended/fp-zfh-insns.d
@@ -0,0 +1,71 @@
+#as: -march=rv64ifdq_zfh
+#source: fp-zfh-insns.s
+#objdump: -dr
+
+.*:[ 	]+file format .*
+
+
+Disassembly of section .text:
+
+0+000 <.text>:
+[ 	]+[0-9a-f]+:[ 	]+00059507[ 	]+flh[ 	]+fa0,0\(a1\)
+[ 	]+[0-9a-f]+:[ 	]+00a59027[ 	]+fsh[ 	]+fa0,0\(a1\)
+[ 	]+[0-9a-f]+:[ 	]+24b58553[ 	]+fmv.h[ 	]+fa0,fa1
+[ 	]+[0-9a-f]+:[ 	]+24b59553[ 	]+fneg.h[ 	]+fa0,fa1
+[ 	]+[0-9a-f]+:[ 	]+24b5a553[ 	]+fabs.h[ 	]+fa0,fa1
+[ 	]+[0-9a-f]+:[ 	]+24c58553[ 	]+fsgnj.h[ 	]+fa0,fa1,fa2
+[ 	]+[0-9a-f]+:[ 	]+24c59553[ 	]+fsgnjn.h[ 	]+fa0,fa1,fa2
+[ 	]+[0-9a-f]+:[ 	]+24c5a553[ 	]+fsgnjx.h[ 	]+fa0,fa1,fa2
+[ 	]+[0-9a-f]+:[ 	]+04c5f553[ 	]+fadd.h[ 	]+fa0,fa1,fa2
+[ 	]+[0-9a-f]+:[ 	]+04c58553[ 	]+fadd.h[ 	]+fa0,fa1,fa2,rne
+[ 	]+[0-9a-f]+:[ 	]+0cc5f553[ 	]+fsub.h[ 	]+fa0,fa1,fa2
+[ 	]+[0-9a-f]+:[ 	]+0cc58553[ 	]+fsub.h[ 	]+fa0,fa1,fa2,rne
+[ 	]+[0-9a-f]+:[ 	]+14c5f553[ 	]+fmul.h[ 	]+fa0,fa1,fa2
+[ 	]+[0-9a-f]+:[ 	]+14c58553[ 	]+fmul.h[ 	]+fa0,fa1,fa2,rne
+[ 	]+[0-9a-f]+:[ 	]+1cc5f553[ 	]+fdiv.h[ 	]+fa0,fa1,fa2
+[ 	]+[0-9a-f]+:[ 	]+1cc58553[ 	]+fdiv.h[ 	]+fa0,fa1,fa2,rne
+[ 	]+[0-9a-f]+:[ 	]+5c05f553[ 	]+fsqrt.h[ 	]+fa0,fa1
+[ 	]+[0-9a-f]+:[ 	]+5c058553[ 	]+fsqrt.h[ 	]+fa0,fa1,rne
+[ 	]+[0-9a-f]+:[ 	]+2cc58553[ 	]+fmin.h[ 	]+fa0,fa1,fa2
+[ 	]+[0-9a-f]+:[ 	]+2cc59553[ 	]+fmax.h[ 	]+fa0,fa1,fa2
+[ 	]+[0-9a-f]+:[ 	]+6cc5f543[ 	]+fmadd.h[ 	]+fa0,fa1,fa2,fa3
+[ 	]+[0-9a-f]+:[ 	]+6cc58543[ 	]+fmadd.h[ 	]+fa0,fa1,fa2,fa3,rne
+[ 	]+[0-9a-f]+:[ 	]+6cc5f54f[ 	]+fnmadd.h[ 	]+fa0,fa1,fa2,fa3
+[ 	]+[0-9a-f]+:[ 	]+6cc5854f[ 	]+fnmadd.h[ 	]+fa0,fa1,fa2,fa3,rne
+[ 	]+[0-9a-f]+:[ 	]+6cc5f547[ 	]+fmsub.h[ 	]+fa0,fa1,fa2,fa3
+[ 	]+[0-9a-f]+:[ 	]+6cc58547[ 	]+fmsub.h[ 	]+fa0,fa1,fa2,fa3,rne
+[ 	]+[0-9a-f]+:[ 	]+6cc5f54b[ 	]+fnmsub.h[ 	]+fa0,fa1,fa2,fa3
+[ 	]+[0-9a-f]+:[ 	]+6cc5854b[ 	]+fnmsub.h[ 	]+fa0,fa1,fa2,fa3,rne
+[ 	]+[0-9a-f]+:[ 	]+c405f553[ 	]+fcvt.w.h[ 	]+a0,fa1
+[ 	]+[0-9a-f]+:[ 	]+c4058553[ 	]+fcvt.w.h[ 	]+a0,fa1,rne
+[ 	]+[0-9a-f]+:[ 	]+c415f553[ 	]+fcvt.wu.h[ 	]+a0,fa1
+[ 	]+[0-9a-f]+:[ 	]+c4158553[ 	]+fcvt.wu.h[ 	]+a0,fa1,rne
+[ 	]+[0-9a-f]+:[ 	]+d405f553[ 	]+fcvt.h.w[ 	]+fa0,a1
+[ 	]+[0-9a-f]+:[ 	]+d4058553[ 	]+fcvt.h.w[ 	]+fa0,a1,rne
+[ 	]+[0-9a-f]+:[ 	]+d415f553[ 	]+fcvt.h.wu[ 	]+fa0,a1
+[ 	]+[0-9a-f]+:[ 	]+d4158553[ 	]+fcvt.h.wu[ 	]+fa0,a1,rne
+[ 	]+[0-9a-f]+:[ 	]+c425f553[ 	]+fcvt.l.h[ 	]+a0,fa1
+[ 	]+[0-9a-f]+:[ 	]+c4258553[ 	]+fcvt.l.h[ 	]+a0,fa1,rne
+[ 	]+[0-9a-f]+:[ 	]+c435f553[ 	]+fcvt.lu.h[ 	]+a0,fa1
+[ 	]+[0-9a-f]+:[ 	]+c4358553[ 	]+fcvt.lu.h[ 	]+a0,fa1,rne
+[ 	]+[0-9a-f]+:[ 	]+d425f553[ 	]+fcvt.h.l[ 	]+fa0,a1
+[ 	]+[0-9a-f]+:[ 	]+d4258553[ 	]+fcvt.h.l[ 	]+fa0,a1,rne
+[ 	]+[0-9a-f]+:[ 	]+d435f553[ 	]+fcvt.h.lu[ 	]+fa0,a1
+[ 	]+[0-9a-f]+:[ 	]+d4358553[ 	]+fcvt.h.lu[ 	]+fa0,a1,rne
+[ 	]+[0-9a-f]+:[ 	]+e4058553[ 	]+fmv.x.h[ 	]+a0,fa1
+[ 	]+[0-9a-f]+:[ 	]+f4058553[ 	]+fmv.h.x[ 	]+fa0,a1
+[ 	]+[0-9a-f]+:[ 	]+40258553[ 	]+fcvt.s.h[ 	]+fa0,fa1
+[ 	]+[0-9a-f]+:[ 	]+42258553[ 	]+fcvt.d.h[ 	]+fa0,fa1
+[ 	]+[0-9a-f]+:[ 	]+46258553[ 	]+fcvt.q.h[ 	]+fa0,fa1
+[ 	]+[0-9a-f]+:[ 	]+4405f553[ 	]+fcvt.h.s[ 	]+fa0,fa1
+[ 	]+[0-9a-f]+:[ 	]+44058553[ 	]+fcvt.h.s[ 	]+fa0,fa1,rne
+[ 	]+[0-9a-f]+:[ 	]+4415f553[ 	]+fcvt.h.d[ 	]+fa0,fa1
+[ 	]+[0-9a-f]+:[ 	]+44158553[ 	]+fcvt.h.d[ 	]+fa0,fa1,rne
+[ 	]+[0-9a-f]+:[ 	]+4435f553[ 	]+fcvt.h.q[ 	]+fa0,fa1
+[ 	]+[0-9a-f]+:[ 	]+44358553[ 	]+fcvt.h.q[ 	]+fa0,fa1,rne
+[ 	]+[0-9a-f]+:[ 	]+e4059553[ 	]+fclass.h[ 	]+a0,fa1
+[ 	]+[0-9a-f]+:[ 	]+a4c5a553[ 	]+feq.h[ 	]+a0,fa1,fa2
+[ 	]+[0-9a-f]+:[ 	]+a4c59553[ 	]+flt.h[ 	]+a0,fa1,fa2
+[ 	]+[0-9a-f]+:[ 	]+a4c58553[ 	]+fle.h[ 	]+a0,fa1,fa2
+[ 	]+[0-9a-f]+:[ 	]+a4c59553[ 	]+flt.h[ 	]+a0,fa1,fa2
+[ 	]+[0-9a-f]+:[ 	]+a4c58553[ 	]+fle.h[ 	]+a0,fa1,fa2
diff --git a/gas/testsuite/gas/riscv/extended/fp-zfh-insns.s b/gas/testsuite/gas/riscv/extended/fp-zfh-insns.s
new file mode 100644
index 00000000000..1a04cc64008
--- /dev/null
+++ b/gas/testsuite/gas/riscv/extended/fp-zfh-insns.s
@@ -0,0 +1,68 @@
+	flh		fa0, 0(a1)
+	fsh		fa0, 0(a1)
+
+	fmv.h		fa0, fa1
+	fneg.h		fa0, fa1
+	fabs.h		fa0, fa1
+	fsgnj.h		fa0, fa1, fa2
+	fsgnjn.h	fa0, fa1, fa2
+	fsgnjx.h	fa0, fa1, fa2
+
+	fadd.h		fa0, fa1, fa2
+	fadd.h		fa0, fa1, fa2, rne
+	fsub.h		fa0, fa1, fa2
+	fsub.h		fa0, fa1, fa2, rne
+	fmul.h		fa0, fa1, fa2
+	fmul.h		fa0, fa1, fa2, rne
+	fdiv.h		fa0, fa1, fa2
+	fdiv.h		fa0, fa1, fa2, rne
+	fsqrt.h		fa0, fa1
+	fsqrt.h		fa0, fa1, rne
+	fmin.h		fa0, fa1, fa2
+	fmax.h		fa0, fa1, fa2
+
+	fmadd.h		fa0, fa1, fa2, fa3
+	fmadd.h		fa0, fa1, fa2, fa3, rne
+	fnmadd.h	fa0, fa1, fa2, fa3
+	fnmadd.h	fa0, fa1, fa2, fa3, rne
+	fmsub.h		fa0, fa1, fa2, fa3
+	fmsub.h		fa0, fa1, fa2, fa3, rne
+	fnmsub.h	fa0, fa1, fa2, fa3
+	fnmsub.h	fa0, fa1, fa2, fa3, rne
+
+	fcvt.w.h	a0, fa1
+	fcvt.w.h	a0, fa1, rne
+	fcvt.wu.h	a0, fa1
+	fcvt.wu.h	a0, fa1, rne
+	fcvt.h.w	fa0, a1
+	fcvt.h.w	fa0, a1, rne
+	fcvt.h.wu	fa0, a1
+	fcvt.h.wu	fa0, a1, rne
+	fcvt.l.h	a0, fa1
+	fcvt.l.h	a0, fa1, rne
+	fcvt.lu.h	a0, fa1
+	fcvt.lu.h	a0, fa1, rne
+	fcvt.h.l	fa0, a1
+	fcvt.h.l	fa0, a1, rne
+	fcvt.h.lu	fa0, a1
+	fcvt.h.lu	fa0, a1, rne
+
+	fmv.x.h		a0, fa1
+	fmv.h.x		fa0, a1
+
+	fcvt.s.h	fa0, fa1
+	fcvt.d.h	fa0, fa1
+	fcvt.q.h	fa0, fa1
+	fcvt.h.s	fa0, fa1
+	fcvt.h.s	fa0, fa1, rne
+	fcvt.h.d	fa0, fa1
+	fcvt.h.d	fa0, fa1, rne
+	fcvt.h.q	fa0, fa1
+	fcvt.h.q	fa0, fa1, rne
+	fclass.h	a0, fa1
+
+	feq.h		a0, fa1, fa2
+	flt.h		a0, fa1, fa2
+	fle.h		a0, fa1, fa2
+	fgt.h		a0, fa2, fa1
+	fge.h		a0, fa2, fa1
diff --git a/include/opcode/riscv-opc-extended.h b/include/opcode/riscv-opc-extended.h
index cc7c56c74a5..72fcaf4bbc5 100644
--- a/include/opcode/riscv-opc-extended.h
+++ b/include/opcode/riscv-opc-extended.h
@@ -19,6 +19,79 @@
 
 #ifndef RISCV_EXTENDED_ENCODING_H
 #define RISCV_EXTENDED_ENCODING_H
+/* ZFH instruction.  */
+#define MATCH_FLH		0x1007
+#define MASK_FLH		0x707f
+#define MATCH_FSH		0x1027
+#define MASK_FSH		0x707f
+#define MATCH_FADD_H		0x4000053
+#define MASK_FADD_H		0xfe00007f
+#define MATCH_FSUB_H		0xc000053
+#define MASK_FSUB_H		0xfe00007f
+#define MATCH_FMUL_H		0x14000053
+#define MASK_FMUL_H		0xfe00007f
+#define MATCH_FDIV_H		0x1c000053
+#define MASK_FDIV_H		0xfe00007f
+#define MATCH_FSGNJ_H		0x24000053
+#define MASK_FSGNJ_H		0xfe00707f
+#define MATCH_FSGNJN_H		0x24001053
+#define MASK_FSGNJN_H		0xfe00707f
+#define MATCH_FSGNJX_H		0x24002053
+#define MASK_FSGNJX_H		0xfe00707f
+#define MATCH_FMIN_H		0x2c000053
+#define MASK_FMIN_H 		0xfe00707f
+#define MATCH_FMAX_H		0x2c001053
+#define MASK_FMAX_H		0xfe00707f
+#define MATCH_FCVT_S_H		0x40200053
+#define MASK_FCVT_S_H		0xfff0007f
+#define MATCH_FCVT_H_S		0x44000053
+#define MASK_FCVT_H_S		0xfff0007f
+#define MATCH_FCVT_D_H		0x42200053
+#define MASK_FCVT_D_H		0xfff0007f
+#define MATCH_FCVT_H_D		0x44100053
+#define MASK_FCVT_H_D		0xfff0007f
+#define MATCH_FCVT_Q_H		0x46200053
+#define MASK_FCVT_Q_H		0xfff0007f
+#define MATCH_FCVT_H_Q		0x44300053
+#define MASK_FCVT_H_Q		0xfff0007f
+#define MATCH_FSQRT_H		0x5c000053
+#define MASK_FSQRT_H		0xfff0007f
+#define MATCH_FLE_H		0xa4000053
+#define MASK_FLE_H		0xfe00707f
+#define MATCH_FLT_H		0xa4001053
+#define MASK_FLT_H		0xfe00707f
+#define MATCH_FEQ_H		0xa4002053
+#define MASK_FEQ_H		0xfe00707f
+#define MATCH_FCVT_W_H		0xc4000053
+#define MASK_FCVT_W_H		0xfff0007f
+#define MATCH_FCVT_WU_H		0xc4100053
+#define MASK_FCVT_WU_H		0xfff0007f
+#define MATCH_FCVT_L_H		0xc4200053
+#define MASK_FCVT_L_H		0xfff0007f
+#define MATCH_FCVT_LU_H		0xc4300053
+#define MASK_FCVT_LU_H		0xfff0007f
+#define MATCH_FMV_X_H		0xe4000053
+#define MASK_FMV_X_H		0xfff0707f
+#define MATCH_FCLASS_H		0xe4001053
+#define MASK_FCLASS_H		0xfff0707f
+#define MATCH_FCVT_H_W		0xd4000053
+#define MASK_FCVT_H_W		0xfff0007f
+#define MATCH_FCVT_H_WU		0xd4100053
+#define MASK_FCVT_H_WU		0xfff0007f
+#define MATCH_FCVT_H_L		0xd4200053
+#define MASK_FCVT_H_L		0xfff0007f
+#define MATCH_FCVT_H_LU		0xd4300053
+#define MASK_FCVT_H_LU		0xfff0007f
+#define MATCH_FMV_H_X		0xf4000053
+#define MASK_FMV_H_X		0xfff0707f
+#define MATCH_FMADD_H		0x4000043
+#define MASK_FMADD_H		0x600007f
+#define MATCH_FMSUB_H		0x4000047
+#define MASK_FMSUB_H		0x600007f
+#define MATCH_FNMSUB_H		0x400004b
+#define MASK_FNMSUB_H		0x600007f
+#define MATCH_FNMADD_H		0x400004f
+#define MASK_FNMADD_H		0x600007f
 /* RVV instruction.  */
 #define MATCH_VSETVL		0x80007057
 #define MASK_VSETVL		0xfe00707f
@@ -1375,6 +1448,44 @@
 #define MATCH_VFDOTVV		0xe4001057
 #define MASK_VFDOTVV		0xfc00707f
 #endif /* RISCV_EXTENDED_ENCODING_H */
+#ifdef DECLARE_INSN
+DECLARE_INSN(fadd_h, MATCH_FADD_H, MASK_FADD_H)
+DECLARE_INSN(fsub_h, MATCH_FSUB_D, MASK_FSUB_H)
+DECLARE_INSN(fmul_h, MATCH_FMUL_D, MASK_FMUL_H)
+DECLARE_INSN(fdiv_h, MATCH_FDIV_D, MASK_FDIV_H)
+DECLARE_INSN(fsgnj_h, MATCH_FSGNJ_D, MASK_FSGNJ_H)
+DECLARE_INSN(fsgnjn_h, MATCH_FSGNJN_D, MASK_FSGNJN_H)
+DECLARE_INSN(fsgnjx_h, MATCH_FSGNJX_D, MASK_FSGNJX_H)
+DECLARE_INSN(fmin_h, MATCH_FMIN_D, MASK_FMIN_H)
+DECLARE_INSN(fmax_h, MATCH_FMAX_D, MASK_FMAX_H)
+DECLARE_INSN(fcvt_s_h, MATCH_FCVT_S_D, MASK_FCVT_S_H)
+DECLARE_INSN(fcvt_h_s, MATCH_FCVT_H_S, MASK_FCVT_H_S)
+DECLARE_INSN(fcvt_d_h, MATCH_FCVT_D_H, MASK_FCVT_D_H)
+DECLARE_INSN(fcvt_h_d, MATCH_FCVT_H_D, MASK_FCVT_H_D)
+DECLARE_INSN(fcvt_q_h, MATCH_FCVT_Q_H, MASK_FCVT_Q_H)
+DECLARE_INSN(fcvt_h_q, MATCH_FCVT_H_Q, MASK_FCVT_H_Q)
+DECLARE_INSN(fsqrt_h, MATCH_FSQRT_H, MASK_FSQRT_H)
+DECLARE_INSN(fle_h, MATCH_FLE_H, MASK_FLE_H)
+DECLARE_INSN(flt_h, MATCH_FLT_H, MASK_FLT_H)
+DECLARE_INSN(feq_h, MATCH_FEQ_H, MASK_FEQ_H)
+DECLARE_INSN(fcvt_w_h, MATCH_FCVT_W_H, MASK_FCVT_W_H)
+DECLARE_INSN(fcvt_wu_h, MATCH_FCVT_WU_H, MASK_FCVT_WU_H)
+DECLARE_INSN(fcvt_l_h, MATCH_FCVT_L_H, MASK_FCVT_L_H)
+DECLARE_INSN(fcvt_lu_h, MATCH_FCVT_LU_H, MASK_FCVT_LU_H)
+DECLARE_INSN(fmv_x_h, MATCH_FMV_X_H, MASK_FMV_X_H)
+DECLARE_INSN(fclass_h, MATCH_FCLASS_H, MASK_FCLASS_H)
+DECLARE_INSN(fcvt_h_w, MATCH_FCVT_H_W, MASK_FCVT_H_W)
+DECLARE_INSN(fcvt_h_wu, MATCH_FCVT_H_WU, MASK_FCVT_H_WU)
+DECLARE_INSN(fcvt_h_l, MATCH_FCVT_H_L, MASK_FCVT_H_L)
+DECLARE_INSN(fcvt_h_lu, MATCH_FCVT_H_LU, MASK_FCVT_H_LU)
+DECLARE_INSN(fmv_h_x, MATCH_FMV_H_X, MASK_FMV_H_X)
+DECLARE_INSN(flh, MATCH_FLH, MASK_FLH)
+DECLARE_INSN(fsh, MATCH_FSH, MASK_FSH)
+DECLARE_INSN(fmadd_h, MATCH_FMADD_H, MASK_FMADD_H)
+DECLARE_INSN(fmsub_h, MATCH_FMSUB_H, MASK_FMSUB_H)
+DECLARE_INSN(fnmsub_h, MATCH_FNMSUB_H, MASK_FNMSUB_H)
+DECLARE_INSN(fnmadd_h, MATCH_FNMADD_H, MASK_FNMADD_H)
+#endif /* DECLARE_INSN */
 #ifdef DECLARE_CSR
 /* Unprivileged extended CSR addresses.  */
 #define CSR_VSTART 0x008
diff --git a/include/opcode/riscv.h b/include/opcode/riscv.h
index 5cafcfb983f..2d9c6650d44 100644
--- a/include/opcode/riscv.h
+++ b/include/opcode/riscv.h
@@ -501,6 +501,9 @@ enum riscv_extended_insn_class
   INSN_CLASS_V_AND_F,
   INSN_CLASS_V_OR_ZVAMO,
   INSN_CLASS_V_OR_ZVLSSEG,
+  INSN_CLASS_ZFH,
+  INSN_CLASS_D_AND_ZFH,
+  INSN_CLASS_Q_AND_ZFH,
 };
 
 /* This is a list of macro expanded instructions for extended
@@ -509,6 +512,8 @@ enum
 {
   M_VMSGE = M_EXTENDED,
   M_VMSGEU,
+  M_FLH,
+  M_FSH,
 };
 
 /* RVV */
diff --git a/opcodes/riscv-opc.c b/opcodes/riscv-opc.c
index 20bf090489e..5962624cbe4 100644
--- a/opcodes/riscv-opc.c
+++ b/opcodes/riscv-opc.c
@@ -1366,6 +1366,71 @@ match_vmv_nf_rv (const struct riscv_opcode *op,
 const struct riscv_opcode riscv_draft_opcodes[] =
 {
 /* name, xlen, isa, operands, match, mask, match_func, pinfo.  */
+/* Half-precision floating-point instruction subset.  */
+{"flh",        0, INSN_CLASS_ZFH,  "D,o(s)",    MATCH_FLH, MASK_FLH, match_opcode, INSN_DREF|INSN_2_BYTE },
+{"flh",        0, INSN_CLASS_ZFH,  "D,A,s",     0, (int) M_FLH, match_never, INSN_MACRO },
+{"fsh",        0, INSN_CLASS_ZFH,  "T,q(s)",    MATCH_FSH, MASK_FSH, match_opcode, INSN_DREF|INSN_2_BYTE },
+{"fsh",        0, INSN_CLASS_ZFH,  "T,A,s",     0, (int) M_FSH, match_never, INSN_MACRO },
+{"fmv.h",      0, INSN_CLASS_ZFH,  "D,U",       MATCH_FSGNJ_H, MASK_FSGNJ_H, match_rs1_eq_rs2, INSN_ALIAS },
+{"fneg.h",     0, INSN_CLASS_ZFH,  "D,U",       MATCH_FSGNJN_H, MASK_FSGNJN_H, match_rs1_eq_rs2, INSN_ALIAS },
+{"fabs.h",     0, INSN_CLASS_ZFH,  "D,U",       MATCH_FSGNJX_H, MASK_FSGNJX_H, match_rs1_eq_rs2, INSN_ALIAS },
+{"fsgnj.h",    0, INSN_CLASS_ZFH,  "D,S,T",     MATCH_FSGNJ_H, MASK_FSGNJ_H, match_opcode, 0 },
+{"fsgnjn.h",   0, INSN_CLASS_ZFH,  "D,S,T",     MATCH_FSGNJN_H, MASK_FSGNJN_H, match_opcode, 0 },
+{"fsgnjx.h",   0, INSN_CLASS_ZFH,  "D,S,T",     MATCH_FSGNJX_H, MASK_FSGNJX_H, match_opcode, 0 },
+{"fadd.h",     0, INSN_CLASS_ZFH,  "D,S,T",     MATCH_FADD_H|MASK_RM, MASK_FADD_H|MASK_RM, match_opcode, 0 },
+{"fadd.h",     0, INSN_CLASS_ZFH,  "D,S,T,m",   MATCH_FADD_H, MASK_FADD_H, match_opcode, 0 },
+{"fsub.h",     0, INSN_CLASS_ZFH,  "D,S,T",     MATCH_FSUB_H|MASK_RM, MASK_FSUB_H|MASK_RM, match_opcode, 0 },
+{"fsub.h",     0, INSN_CLASS_ZFH,  "D,S,T,m",   MATCH_FSUB_H, MASK_FSUB_H, match_opcode, 0 },
+{"fmul.h",     0, INSN_CLASS_ZFH,  "D,S,T",     MATCH_FMUL_H|MASK_RM, MASK_FMUL_H|MASK_RM, match_opcode, 0 },
+{"fmul.h",     0, INSN_CLASS_ZFH,  "D,S,T,m",   MATCH_FMUL_H, MASK_FMUL_H, match_opcode, 0 },
+{"fdiv.h",     0, INSN_CLASS_ZFH,  "D,S,T",     MATCH_FDIV_H|MASK_RM, MASK_FDIV_H|MASK_RM, match_opcode, 0 },
+{"fdiv.h",     0, INSN_CLASS_ZFH,  "D,S,T,m",   MATCH_FDIV_H, MASK_FDIV_H, match_opcode, 0 },
+{"fsqrt.h",    0, INSN_CLASS_ZFH,  "D,S",       MATCH_FSQRT_H|MASK_RM, MASK_FSQRT_H|MASK_RM, match_opcode, 0 },
+{"fsqrt.h",    0, INSN_CLASS_ZFH,  "D,S,m",     MATCH_FSQRT_H, MASK_FSQRT_H, match_opcode, 0 },
+{"fmin.h",     0, INSN_CLASS_ZFH,  "D,S,T",     MATCH_FMIN_H, MASK_FMIN_H, match_opcode, 0 },
+{"fmax.h",     0, INSN_CLASS_ZFH,  "D,S,T",     MATCH_FMAX_H, MASK_FMAX_H, match_opcode, 0 },
+{"fmadd.h",    0, INSN_CLASS_ZFH,  "D,S,T,R",   MATCH_FMADD_H|MASK_RM, MASK_FMADD_H|MASK_RM, match_opcode, 0 },
+{"fmadd.h",    0, INSN_CLASS_ZFH,  "D,S,T,R,m", MATCH_FMADD_H, MASK_FMADD_H, match_opcode, 0 },
+{"fnmadd.h",   0, INSN_CLASS_ZFH,  "D,S,T,R",   MATCH_FNMADD_H|MASK_RM, MASK_FNMADD_H|MASK_RM, match_opcode, 0 },
+{"fnmadd.h",   0, INSN_CLASS_ZFH,  "D,S,T,R,m", MATCH_FNMADD_H, MASK_FNMADD_H, match_opcode, 0 },
+{"fmsub.h",    0, INSN_CLASS_ZFH,  "D,S,T,R",   MATCH_FMSUB_H|MASK_RM, MASK_FMSUB_H|MASK_RM, match_opcode, 0 },
+{"fmsub.h",    0, INSN_CLASS_ZFH,  "D,S,T,R,m", MATCH_FMSUB_H, MASK_FMSUB_H, match_opcode, 0 },
+{"fnmsub.h",   0, INSN_CLASS_ZFH,  "D,S,T,R",   MATCH_FNMSUB_H|MASK_RM, MASK_FNMSUB_H|MASK_RM, match_opcode, 0 },
+{"fnmsub.h",   0, INSN_CLASS_ZFH,  "D,S,T,R,m", MATCH_FNMSUB_H, MASK_FNMSUB_H, match_opcode, 0 },
+{"fcvt.w.h",   0, INSN_CLASS_ZFH,  "d,S",       MATCH_FCVT_W_H|MASK_RM, MASK_FCVT_W_H|MASK_RM, match_opcode, 0 },
+{"fcvt.w.h",   0, INSN_CLASS_ZFH,  "d,S,m",     MATCH_FCVT_W_H, MASK_FCVT_W_H, match_opcode, 0 },
+{"fcvt.wu.h",  0, INSN_CLASS_ZFH,  "d,S",       MATCH_FCVT_WU_H|MASK_RM, MASK_FCVT_WU_H|MASK_RM, match_opcode, 0 },
+{"fcvt.wu.h",  0, INSN_CLASS_ZFH,  "d,S,m",     MATCH_FCVT_WU_H, MASK_FCVT_WU_H, match_opcode, 0 },
+{"fcvt.h.w",   0, INSN_CLASS_ZFH,  "D,s",       MATCH_FCVT_H_W|MASK_RM, MASK_FCVT_H_W|MASK_RM, match_opcode, 0 },
+{"fcvt.h.w",   0, INSN_CLASS_ZFH,  "D,s,m",     MATCH_FCVT_H_W, MASK_FCVT_H_W, match_opcode, 0 },
+{"fcvt.h.wu",  0, INSN_CLASS_ZFH,  "D,s",       MATCH_FCVT_H_WU|MASK_RM, MASK_FCVT_H_WU|MASK_RM, match_opcode, 0 },
+{"fcvt.h.wu",  0, INSN_CLASS_ZFH,  "D,s,m",     MATCH_FCVT_H_WU, MASK_FCVT_H_WU, match_opcode, 0 },
+{"fcvt.s.h",   0, INSN_CLASS_ZFH,  "D,S",       MATCH_FCVT_S_H, MASK_FCVT_S_H|MASK_RM, match_opcode, 0 },
+{"fcvt.d.h",   0, INSN_CLASS_D_AND_ZFH,  "D,S",       MATCH_FCVT_D_H, MASK_FCVT_D_H|MASK_RM, match_opcode, 0 },
+{"fcvt.q.h",   0, INSN_CLASS_Q_AND_ZFH,  "D,S",       MATCH_FCVT_Q_H, MASK_FCVT_Q_H|MASK_RM, match_opcode, 0 },
+{"fcvt.h.s",   0, INSN_CLASS_ZFH,  "D,S",       MATCH_FCVT_H_S|MASK_RM, MASK_FCVT_H_S|MASK_RM, match_opcode, 0 },
+{"fcvt.h.s",   0, INSN_CLASS_ZFH,  "D,S,m",     MATCH_FCVT_H_S, MASK_FCVT_H_S, match_opcode, 0 },
+{"fcvt.h.d",   0, INSN_CLASS_D_AND_ZFH,  "D,S",       MATCH_FCVT_H_D|MASK_RM, MASK_FCVT_H_D|MASK_RM, match_opcode, 0 },
+{"fcvt.h.d",   0, INSN_CLASS_D_AND_ZFH,  "D,S,m",     MATCH_FCVT_H_D, MASK_FCVT_H_D, match_opcode, 0 },
+{"fcvt.h.q",   0, INSN_CLASS_Q_AND_ZFH,  "D,S",       MATCH_FCVT_H_Q|MASK_RM, MASK_FCVT_H_Q|MASK_RM, match_opcode, 0 },
+{"fcvt.h.q",   0, INSN_CLASS_Q_AND_ZFH,  "D,S,m",     MATCH_FCVT_H_Q, MASK_FCVT_H_Q, match_opcode, 0 },
+{"fclass.h",   0, INSN_CLASS_ZFH,  "d,S",       MATCH_FCLASS_H, MASK_FCLASS_H, match_opcode, 0 },
+{"feq.h",      0, INSN_CLASS_ZFH,  "d,S,T",     MATCH_FEQ_H, MASK_FEQ_H, match_opcode, 0 },
+{"flt.h",      0, INSN_CLASS_ZFH,  "d,S,T",     MATCH_FLT_H, MASK_FLT_H, match_opcode, 0 },
+{"fle.h",      0, INSN_CLASS_ZFH,  "d,S,T",     MATCH_FLE_H, MASK_FLE_H, match_opcode, 0 },
+{"fgt.h",      0, INSN_CLASS_ZFH,  "d,T,S",     MATCH_FLT_H, MASK_FLT_H, match_opcode, 0 },
+{"fge.h",      0, INSN_CLASS_ZFH,  "d,T,S",     MATCH_FLE_H, MASK_FLE_H, match_opcode, 0 },
+{"fmv.x.h",    0, INSN_CLASS_ZFH,  "d,S",       MATCH_FMV_X_H, MASK_FMV_X_H, match_opcode, 0 },
+{"fmv.h.x",    0, INSN_CLASS_ZFH,  "D,s",       MATCH_FMV_H_X, MASK_FMV_H_X, match_opcode, 0 },
+{"fcvt.l.h",  64, INSN_CLASS_ZFH,  "d,S",       MATCH_FCVT_L_H|MASK_RM, MASK_FCVT_L_H|MASK_RM, match_opcode, 0 },
+{"fcvt.l.h",  64, INSN_CLASS_ZFH,  "d,S,m",     MATCH_FCVT_L_H, MASK_FCVT_L_H, match_opcode, 0 },
+{"fcvt.lu.h", 64, INSN_CLASS_ZFH,  "d,S",       MATCH_FCVT_LU_H|MASK_RM, MASK_FCVT_LU_H|MASK_RM, match_opcode, 0 },
+{"fcvt.lu.h", 64, INSN_CLASS_ZFH,  "d,S,m",     MATCH_FCVT_LU_H, MASK_FCVT_LU_H, match_opcode, 0 },
+{"fcvt.h.l",  64, INSN_CLASS_ZFH,  "D,s",       MATCH_FCVT_H_L|MASK_RM, MASK_FCVT_H_L|MASK_RM, match_opcode, 0 },
+{"fcvt.h.l",  64, INSN_CLASS_ZFH,  "D,s,m",     MATCH_FCVT_H_L, MASK_FCVT_H_L, match_opcode, 0 },
+{"fcvt.h.lu", 64, INSN_CLASS_ZFH,  "D,s",       MATCH_FCVT_H_LU|MASK_RM, MASK_FCVT_H_L|MASK_RM, match_opcode, 0 },
+{"fcvt.h.lu", 64, INSN_CLASS_ZFH,  "D,s,m",     MATCH_FCVT_H_LU, MASK_FCVT_H_LU, match_opcode, 0 },
+
 /* RVV */
 {"vsetvl",     0, INSN_CLASS_V,  "d,s,t",  MATCH_VSETVL, MASK_VSETVL, match_opcode, 0},
 {"vsetvli",    0, INSN_CLASS_V,  "d,s,Vc", MATCH_VSETVLI, MASK_VSETVLI, match_opcode, 0},