DEPRECATED RISC-V: Add 'Zfb' extension

It was a implementation of early draft of the 'Zfb' extension.

Because 'Zfa' (not just renamed from 'Zfb') has several instructions that
need special handling, this commit is kept for educational purposes.

bfd/ChangeLog:

	* elfxx-riscv.c (riscv_multi_subset_supports): Add instruction
	class support for 'Zfb' extension.
	(riscv_multi_subset_supports_ext): Likewise.

gas/ChangeLog:

	* testsuite/gas/riscv/zfb.d: New test.
	* testsuite/gas/riscv/zfb.s: Likewise.
	* testsuite/gas/riscv/zfb-32.d: New test.
	* testsuite/gas/riscv/zfb-32.s: Likewise.
	* testsuite/gas/riscv/zfb-64.d: Likewise.
	* testsuite/gas/riscv/zfb-64.s: Likewise.

include/ChangeLog:

	* opcode/riscv-opc.h (MATCH_FMINI_S, MASK_FMINI_S,
	MATCH_FMAXI_S, MASK_FMAXI_S, MATCH_FLTQ_S, MASK_FLTQ_S,
	MATCH_FLEQ_S, MASK_FLEQ_S, MATCH_FMINI_D, MASK_FMINI_D,
	MATCH_FMAXI_D, MASK_FMAXI_D, MATCH_FLTQ_D, MASK_FLTQ_D,
	MATCH_FLEQ_D, MASK_FLEQ_D, MATCH_FMINI_Q, MASK_FMINI_Q,
	MATCH_FMAXI_Q, MASK_FMAXI_Q, MATCH_FLTQ_Q, MASK_FLTQ_Q,
	MATCH_FLEQ_Q, MASK_FLEQ_Q, MATCH_FMVH_X_D, MASK_FMVH_X_D,
	MATCH_FMVH_X_Q, MASK_FMVH_X_Q, MATCH_FMVP_D_X, MASK_FMVP_D_X,
	MATCH_FMVP_Q_X, MASK_FMVP_Q_X): New.
	* opcode/riscv.h (enum riscv_insn_class): Add instruction
	classes for 'Zfb' extension.

opcodes/ChangeLog:

	* riscv-opc.c (riscv_opcodes): Add 'Zfb' instructions.

bfd/elfxx-riscv.c

@@ -1168,6 +1168,7 @@ static struct riscv_supported_ext riscv_supported_std_z_ext[] =
   {"zihintpause",	ISA_SPEC_CLASS_DRAFT,		2, 0,  0 },
   {"zmmul",		ISA_SPEC_CLASS_DRAFT,		1, 0,  0 },
   {"zawrs",		ISA_SPEC_CLASS_DRAFT,		1, 0,  0 },
+  {"zfb",		ISA_SPEC_CLASS_DRAFT,		0, 1,  0 },
   {"zfh",		ISA_SPEC_CLASS_DRAFT,		1, 0,  0 },
   {"zfhmin",		ISA_SPEC_CLASS_DRAFT,		1, 0,  0 },
   {"zfinx",		ISA_SPEC_CLASS_DRAFT,		1, 0,  0 },
@@ -2361,6 +2362,14 @@ riscv_multi_subset_supports (riscv_parse_subset_t *rps,
 	       && riscv_subset_supports (rps, "q"))
 	      || (riscv_subset_supports (rps, "zhinxmin")
 		  && riscv_subset_supports (rps, "zqinx")));
+    case INSN_CLASS_ZFB:
+      return riscv_subset_supports (rps, "zfb");
+    case INSN_CLASS_D_AND_ZFB:
+      return riscv_subset_supports (rps, "d")
+	     && riscv_subset_supports (rps, "zfb");
+    case INSN_CLASS_Q_AND_ZFB:
+      return riscv_subset_supports (rps, "q")
+	     && riscv_subset_supports (rps, "zfb");
     case INSN_CLASS_ZBA:
       return riscv_subset_supports (rps, "zba");
     case INSN_CLASS_ZBB:
@@ -2523,6 +2532,24 @@ riscv_multi_subset_supports_ext (riscv_parse_subset_t *rps,
 	return "zhinxmin";
       else
 	return _("zfhmin' and `q', or `zhinxmin' and `zqinx");
+    case INSN_CLASS_ZFB:
+      return "zfb";
+    case INSN_CLASS_D_AND_ZFB:
+      if (!riscv_subset_supports (rps, "d")
+	  && !riscv_subset_supports (rps, "zfb"))
+	return _("d' and `zfb");
+      else if (!riscv_subset_supports (rps, "d"))
+	return "d";
+      else
+	return "zfb";
+    case INSN_CLASS_Q_AND_ZFB:
+      if (!riscv_subset_supports (rps, "q")
+	  && !riscv_subset_supports (rps, "zfb"))
+	return _("q' and `zfb");
+      else if (!riscv_subset_supports (rps, "q"))
+	return "q";
+      else
+	return "zfb";
     case INSN_CLASS_ZBA:
       return "zba";
     case INSN_CLASS_ZBB:

gas/testsuite/gas/riscv/zfb-32.d

@@ -0,0 +1,11 @@
+#as: -march=rv32id_zfb
+#source: zfb-32.s
+#objdump: -dr
+
+.*:[ 	]+file format .*
+
+Disassembly of section .text:
+
+0+000 <target>:
+[ 	]+[0-9a-f]+:[ 	]+e2108553[ 	]+fmvh\.x\.d[ 	]+a0,ft1
+[ 	]+[0-9a-f]+:[ 	]+b2b500d3[ 	]+fmvp\.d\.x[ 	]+ft1,a0,a1

gas/testsuite/gas/riscv/zfb-32.s

@@ -0,0 +1,3 @@
+target:
+	fmvh.x.d	a0, ft1
+	fmvp.d.x	ft1, a0, a1

gas/testsuite/gas/riscv/zfb-64.d

@@ -0,0 +1,11 @@
+#as: -march=rv64iq_zfb
+#source: zfb-64.s
+#objdump: -dr
+
+.*:[ 	]+file format .*
+
+Disassembly of section .text:
+
+0+000 <target>:
+[ 	]+[0-9a-f]+:[ 	]+e6108553[ 	]+fmvh\.x\.q[ 	]+a0,ft1
+[ 	]+[0-9a-f]+:[ 	]+b6b500d3[ 	]+fmvp\.q\.x[ 	]+ft1,a0,a1

gas/testsuite/gas/riscv/zfb-64.s

@@ -0,0 +1,3 @@
+target:
+	fmvh.x.q	a0, ft1
+	fmvp.q.x	ft1, a0, a1

gas/testsuite/gas/riscv/zfb.d

@@ -0,0 +1,33 @@
+#as: -march=rv64iq_zfb
+#source: zfb.s
+#objdump: -dr
+
+.*:[ 	]+file format .*
+
+Disassembly of section .text:
+
+0+000 <target>:
+[ 	]+[0-9a-f]+:[ 	]+283100d3[ 	]+fmin\.s[ 	]+ft1,ft2,ft3
+[ 	]+[0-9a-f]+:[ 	]+283120d3[ 	]+fmini\.s[ 	]+ft1,ft2,ft3
+[ 	]+[0-9a-f]+:[ 	]+2a3100d3[ 	]+fmin\.d[ 	]+ft1,ft2,ft3
+[ 	]+[0-9a-f]+:[ 	]+2a3120d3[ 	]+fmini\.d[ 	]+ft1,ft2,ft3
+[ 	]+[0-9a-f]+:[ 	]+2e3100d3[ 	]+fmin\.q[ 	]+ft1,ft2,ft3
+[ 	]+[0-9a-f]+:[ 	]+2e3120d3[ 	]+fmini\.q[ 	]+ft1,ft2,ft3
+[ 	]+[0-9a-f]+:[ 	]+283110d3[ 	]+fmax\.s[ 	]+ft1,ft2,ft3
+[ 	]+[0-9a-f]+:[ 	]+283130d3[ 	]+fmaxi\.s[ 	]+ft1,ft2,ft3
+[ 	]+[0-9a-f]+:[ 	]+2a3110d3[ 	]+fmax\.d[ 	]+ft1,ft2,ft3
+[ 	]+[0-9a-f]+:[ 	]+2a3130d3[ 	]+fmaxi\.d[ 	]+ft1,ft2,ft3
+[ 	]+[0-9a-f]+:[ 	]+2e3110d3[ 	]+fmax\.q[ 	]+ft1,ft2,ft3
+[ 	]+[0-9a-f]+:[ 	]+2e3130d3[ 	]+fmaxi\.q[ 	]+ft1,ft2,ft3
+[ 	]+[0-9a-f]+:[ 	]+a0209553[ 	]+flt\.s[ 	]+a0,ft1,ft2
+[ 	]+[0-9a-f]+:[ 	]+a020d553[ 	]+fltq\.s[ 	]+a0,ft1,ft2
+[ 	]+[0-9a-f]+:[ 	]+a2209553[ 	]+flt\.d[ 	]+a0,ft1,ft2
+[ 	]+[0-9a-f]+:[ 	]+a220d553[ 	]+fltq\.d[ 	]+a0,ft1,ft2
+[ 	]+[0-9a-f]+:[ 	]+a6209553[ 	]+flt\.q[ 	]+a0,ft1,ft2
+[ 	]+[0-9a-f]+:[ 	]+a620d553[ 	]+fltq\.q[ 	]+a0,ft1,ft2
+[ 	]+[0-9a-f]+:[ 	]+a0208553[ 	]+fle\.s[ 	]+a0,ft1,ft2
+[ 	]+[0-9a-f]+:[ 	]+a020c553[ 	]+fleq\.s[ 	]+a0,ft1,ft2
+[ 	]+[0-9a-f]+:[ 	]+a2208553[ 	]+fle\.d[ 	]+a0,ft1,ft2
+[ 	]+[0-9a-f]+:[ 	]+a220c553[ 	]+fleq\.d[ 	]+a0,ft1,ft2
+[ 	]+[0-9a-f]+:[ 	]+a6208553[ 	]+fle\.q[ 	]+a0,ft1,ft2
+[ 	]+[0-9a-f]+:[ 	]+a620c553[ 	]+fleq\.q[ 	]+a0,ft1,ft2

gas/testsuite/gas/riscv/zfb.s

@@ -0,0 +1,27 @@
+target:
+	# fmini/fmaxi (Zfb): same as fmin/fmax (F/D/Q) except bit 13 set
+	fmin.s	ft1, ft2, ft3
+	fmini.s	ft1, ft2, ft3
+	fmin.d	ft1, ft2, ft3
+	fmini.d	ft1, ft2, ft3
+	fmin.q	ft1, ft2, ft3
+	fmini.q	ft1, ft2, ft3
+	fmax.s	ft1, ft2, ft3
+	fmaxi.s	ft1, ft2, ft3
+	fmax.d	ft1, ft2, ft3
+	fmaxi.d	ft1, ft2, ft3
+	fmax.q	ft1, ft2, ft3
+	fmaxi.q	ft1, ft2, ft3
+	# fltq/fleq (Zfb): same as flt/fle (F/D/Q) except bit 14 set
+	flt.s	a0, ft1, ft2
+	fltq.s	a0, ft1, ft2
+	flt.d	a0, ft1, ft2
+	fltq.d	a0, ft1, ft2
+	flt.q	a0, ft1, ft2
+	fltq.q	a0, ft1, ft2
+	fle.s	a0, ft1, ft2
+	fleq.s	a0, ft1, ft2
+	fle.d	a0, ft1, ft2
+	fleq.d	a0, ft1, ft2
+	fle.q	a0, ft1, ft2
+	fleq.q	a0, ft1, ft2

include/opcode/riscv-opc.h

@@ -419,6 +419,38 @@
 #define MASK_FCVT_Q_L  0xfff0007f
 #define MATCH_FCVT_Q_LU 0xd6300053
 #define MASK_FCVT_Q_LU  0xfff0007f
+#define MATCH_FMINI_S 0x28002053
+#define MASK_FMINI_S 0xfe00707f
+#define MATCH_FMAXI_S 0x28003053
+#define MASK_FMAXI_S 0xfe00707f
+#define MATCH_FLTQ_S 0xa0005053
+#define MASK_FLTQ_S 0xfe00707f
+#define MATCH_FLEQ_S 0xa0004053
+#define MASK_FLEQ_S 0xfe00707f
+#define MATCH_FMINI_D 0x2a002053
+#define MASK_FMINI_D 0xfe00707f
+#define MATCH_FMAXI_D 0x2a003053
+#define MASK_FMAXI_D 0xfe00707f
+#define MATCH_FLTQ_D 0xa2005053
+#define MASK_FLTQ_D 0xfe00707f
+#define MATCH_FLEQ_D 0xa2004053
+#define MASK_FLEQ_D 0xfe00707f
+#define MATCH_FMINI_Q 0x2e002053
+#define MASK_FMINI_Q 0xfe00707f
+#define MATCH_FMAXI_Q 0x2e003053
+#define MASK_FMAXI_Q 0xfe00707f
+#define MATCH_FLTQ_Q 0xa6005053
+#define MASK_FLTQ_Q 0xfe00707f
+#define MATCH_FLEQ_Q 0xa6004053
+#define MASK_FLEQ_Q 0xfe00707f
+#define MATCH_FMVH_X_D 0xe2100053
+#define MASK_FMVH_X_D 0xfff0707f
+#define MATCH_FMVH_X_Q 0xe6100053
+#define MASK_FMVH_X_Q 0xfff0707f
+#define MATCH_FMVP_D_X 0xb2000053
+#define MASK_FMVP_D_X 0xfe00707f
+#define MATCH_FMVP_Q_X 0xb6000053
+#define MASK_FMVP_Q_X 0xfe00707f
 #define MATCH_CLZ 0x60001013
 #define MASK_CLZ  0xfff0707f
 #define MATCH_CTZ 0x60101013
@@ -2937,6 +2969,22 @@ DECLARE_INSN(fcvt_q_w, MATCH_FCVT_Q_W, MASK_FCVT_Q_W)
 DECLARE_INSN(fcvt_q_wu, MATCH_FCVT_Q_WU, MASK_FCVT_Q_WU)
 DECLARE_INSN(fcvt_q_l, MATCH_FCVT_Q_L, MASK_FCVT_Q_L)
 DECLARE_INSN(fcvt_q_lu, MATCH_FCVT_Q_LU, MASK_FCVT_Q_LU)
+DECLARE_INSN(fmini_s, MATCH_FMINI_S, MASK_FMINI_S)
+DECLARE_INSN(fmaxi_s, MATCH_FMAXI_S, MASK_FMAXI_S)
+DECLARE_INSN(fltq_s, MATCH_FLTQ_S, MASK_FLTQ_S)
+DECLARE_INSN(fleq_s, MATCH_FLEQ_S, MASK_FLEQ_S)
+DECLARE_INSN(fmini_d, MATCH_FMINI_D, MASK_FMINI_D)
+DECLARE_INSN(fmaxi_d, MATCH_FMAXI_D, MASK_FMAXI_D)
+DECLARE_INSN(fltq_d, MATCH_FLTQ_D, MASK_FLTQ_D)
+DECLARE_INSN(fleq_d, MATCH_FLEQ_D, MASK_FLEQ_D)
+DECLARE_INSN(fmini_q, MATCH_FMINI_Q, MASK_FMINI_Q)
+DECLARE_INSN(fmaxi_q, MATCH_FMAXI_Q, MASK_FMAXI_Q)
+DECLARE_INSN(fltq_q, MATCH_FLTQ_Q, MASK_FLTQ_Q)
+DECLARE_INSN(fleq_q, MATCH_FLEQ_Q, MASK_FLEQ_Q)
+DECLARE_INSN(fmvh_x_d, MATCH_FMVH_X_D, MASK_FMVH_X_D)
+DECLARE_INSN(fmvh_x_q, MATCH_FMVH_X_Q, MASK_FMVH_X_Q)
+DECLARE_INSN(fmvp_d_x, MATCH_FMVP_D_X, MASK_FMVP_D_X)
+DECLARE_INSN(fmvp_q_x, MATCH_FMVP_Q_X, MASK_FMVP_Q_X)
 DECLARE_INSN(clz, MATCH_CLZ, MASK_CLZ)
 DECLARE_INSN(ctz, MATCH_CTZ, MASK_CTZ)
 DECLARE_INSN(cpop, MATCH_CPOP, MASK_CPOP)

include/opcode/riscv.h

@@ -388,6 +388,9 @@ enum riscv_insn_class
   INSN_CLASS_ZFHMIN_INX,
   INSN_CLASS_ZFHMIN_AND_D_INX,
   INSN_CLASS_ZFHMIN_AND_Q_INX,
+  INSN_CLASS_ZFB,
+  INSN_CLASS_D_AND_ZFB,
+  INSN_CLASS_Q_AND_ZFB,
   INSN_CLASS_ZBA,
   INSN_CLASS_ZBB,
   INSN_CLASS_ZBC,

opcodes/riscv-opc.c

@@ -760,6 +760,10 @@ const struct riscv_opcode riscv_opcodes[] =
 {"fcvt.s.l",  64, INSN_CLASS_F_INX,   "D,s,m",     MATCH_FCVT_S_L, MASK_FCVT_S_L, match_opcode, 0 },
 {"fcvt.s.lu", 64, INSN_CLASS_F_INX,   "D,s",       MATCH_FCVT_S_LU|MASK_RM, MASK_FCVT_S_LU|MASK_RM, match_opcode, 0 },
 {"fcvt.s.lu", 64, INSN_CLASS_F_INX,   "D,s,m",     MATCH_FCVT_S_LU, MASK_FCVT_S_LU, match_opcode, 0 },
+{"fmini.s",    0, INSN_CLASS_ZFB,          "D,S,T",     MATCH_FMINI_S, MASK_FMINI_S, match_opcode, 0 },
+{"fmaxi.s",    0, INSN_CLASS_ZFB,          "D,S,T",     MATCH_FMAXI_S, MASK_FMAXI_S, match_opcode, 0 },
+{"fltq.s",     0, INSN_CLASS_ZFB,          "d,S,T",     MATCH_FLTQ_S, MASK_FLTQ_S, match_opcode, 0 },
+{"fleq.s",     0, INSN_CLASS_ZFB,          "d,S,T",     MATCH_FLEQ_S, MASK_FLEQ_S, match_opcode, 0 },
 
 /* Double-precision floating-point instruction subset.  */
 {"fld",        0, INSN_CLASS_D_AND_C, "D,Cn(Cc)",  MATCH_C_FLDSP, MASK_C_FLDSP, match_opcode, INSN_ALIAS|INSN_DREF|INSN_8_BYTE },
@@ -821,6 +825,12 @@ const struct riscv_opcode riscv_opcodes[] =
 {"fcvt.d.l",  64, INSN_CLASS_D_INX,   "D,s,m",     MATCH_FCVT_D_L, MASK_FCVT_D_L, match_opcode, 0 },
 {"fcvt.d.lu", 64, INSN_CLASS_D_INX,   "D,s",       MATCH_FCVT_D_LU|MASK_RM, MASK_FCVT_D_LU|MASK_RM, match_opcode, 0 },
 {"fcvt.d.lu", 64, INSN_CLASS_D_INX,   "D,s,m",     MATCH_FCVT_D_LU, MASK_FCVT_D_LU, match_opcode, 0 },
+{"fmini.d",    0, INSN_CLASS_D_AND_ZFB,    "D,S,T",     MATCH_FMINI_D, MASK_FMINI_D, match_opcode, 0 },
+{"fmaxi.d",    0, INSN_CLASS_D_AND_ZFB,    "D,S,T",     MATCH_FMAXI_D, MASK_FMAXI_D, match_opcode, 0 },
+{"fltq.d",     0, INSN_CLASS_D_AND_ZFB,    "d,S,T",     MATCH_FLTQ_D, MASK_FLTQ_D, match_opcode, 0 },
+{"fleq.d",     0, INSN_CLASS_D_AND_ZFB,    "d,S,T",     MATCH_FLEQ_D, MASK_FLEQ_D, match_opcode, 0 },
+{"fmvh.x.d",  32, INSN_CLASS_D_AND_ZFB,    "d,S",       MATCH_FMVH_X_D, MASK_FMVH_X_D, match_opcode, 0},
+{"fmvp.d.x",  32, INSN_CLASS_D_AND_ZFB,    "D,s,t",     MATCH_FMVP_D_X, MASK_FMVP_D_X, match_opcode, 0},
 
 /* Quad-precision floating-point instruction subset.  */
 {"flq",        0, INSN_CLASS_Q,   "D,o(s)",    MATCH_FLQ, MASK_FLQ, match_opcode, INSN_DREF|INSN_16_BYTE },
@@ -879,6 +889,12 @@ const struct riscv_opcode riscv_opcodes[] =
 {"fcvt.q.l",  64, INSN_CLASS_Q_INX,   "D,s,m",     MATCH_FCVT_Q_L, MASK_FCVT_Q_L, match_opcode, 0 },
 {"fcvt.q.lu", 64, INSN_CLASS_Q_INX,   "D,s",       MATCH_FCVT_Q_LU, MASK_FCVT_Q_LU|MASK_RM, match_opcode, 0 },
 {"fcvt.q.lu", 64, INSN_CLASS_Q_INX,   "D,s,m",     MATCH_FCVT_Q_LU, MASK_FCVT_Q_LU, match_opcode, 0 },
+{"fmini.q",    0, INSN_CLASS_Q_AND_ZFB,    "D,S,T",     MATCH_FMINI_Q, MASK_FMINI_Q, match_opcode, 0 },
+{"fmaxi.q",    0, INSN_CLASS_Q_AND_ZFB,    "D,S,T",     MATCH_FMAXI_Q, MASK_FMAXI_Q, match_opcode, 0 },
+{"fltq.q",     0, INSN_CLASS_Q_AND_ZFB,    "d,S,T",     MATCH_FLTQ_Q, MASK_FLTQ_Q, match_opcode, 0 },
+{"fleq.q",     0, INSN_CLASS_Q_AND_ZFB,    "d,S,T",     MATCH_FLEQ_Q, MASK_FLEQ_Q, match_opcode, 0 },
+{"fmvh.x.q",  64, INSN_CLASS_Q_AND_ZFB,    "d,S",       MATCH_FMVH_X_Q, MASK_FMVH_X_Q, match_opcode, 0},
+{"fmvp.q.x",  64, INSN_CLASS_Q_AND_ZFB,    "D,s,t",     MATCH_FMVP_Q_X, MASK_FMVP_Q_X, match_opcode, 0},
 
 /* Compressed instructions.  */
 {"c.unimp",    0, INSN_CLASS_C,   "",          0, 0xffffU,  match_opcode, 0 },