RISC-V: Support rvv extension with released version 1.0.

2021-11-17  Jim Wilson  <jimw@sifive.com>
            Kito Cheng  <kito.cheng@sifive.com>
            Nelson Chu  <nelson.chu@sifive.com>

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

And here is the vector spec,
https://github.com/riscv/riscv-v-spec

bfd/
	* elfxx-riscv.c (riscv_implicit_subsets): Added imply rules
	of v, zve and zvl extensions.
	(riscv_supported_std_ext): Updated verison of v to  1.0.
	(riscv_supported_std_z_ext): Added zve and zvl extensions.
	(riscv_parse_check_conflicts): The zvl extensions need to
	enable either v or zve extension.
	(riscv_multi_subset_supports): Check the subset list to know
	if the INSN_CLASS_V and INSN_CLASS_ZVEF instructions are supported.
gas/
	* config/tc-riscv.c (enum riscv_csr_class): Added CSR_CLASS_V.
	(enum reg_class): Added RCLASS_VECR and RCLASS_VECM.
	(validate_riscv_insn): Check whether the rvv operands are valid.
	(md_begin): Initialize register hash for rvv registers.
	(macro_build): Added rvv operands when expanding rvv pseudoes.
	(vector_macro): Expand rvv macros into one or more instructions.
	(macro): Likewise.
	(my_getVsetvliExpression): Similar to my_getVsetvliExpression,
	but used for parsing vsetvli operands.
	(riscv_ip): Parse and encode rvv operands.  Besides, The rvv loads
	and stores with EEW 64 cannot be used when zve32x is enabled.
	* testsuite/gas/riscv/priv-reg-fail-version-1p10.d: Updated -march
	to rv32ifv_zkr.
	* testsuite/gas/riscv/priv-reg-fail-version-1p11.d: Likewise.
	* testsuite/gas/riscv/priv-reg-fail-version-1p9p1.d: Likewise.
	* testsuite/gas/riscv/priv-reg.s: Added rvv csr testcases.
	* testsuite/gas/riscv/priv-reg-version-1p10.d: Likewise.
	* testsuite/gas/riscv/priv-reg-version-1p11.d: Likewise.
	* testsuite/gas/riscv/priv-reg-version-1p9p1.d: Likewise.
	* testsuite/gas/riscv/march-imply-v.d: New testcase.
	* testsuite/gas/riscv/vector-insns-fail-zve32xf.d: Likewise.
	* testsuite/gas/riscv/vector-insns-fail-zve32xf.l: Likewise.
	* testsuite/gas/riscv/vector-insns-fail-zvl.d: Likewise.
	* testsuite/gas/riscv/vector-insns-fail-zvl.l: Likewise.
	* testsuite/gas/riscv/vector-insns-vmsgtvx.d: Likewise.
	* testsuite/gas/riscv/vector-insns-vmsgtvx.s: Likewise.
	* testsuite/gas/riscv/vector-insns-zero-imm.d: Likewise.
	* testsuite/gas/riscv/vector-insns-zero-imm.s: Likewise.
	* testsuite/gas/riscv/vector-insns.d: Likewise.
	* testsuite/gas/riscv/vector-insns.s: Likewise.
include/
	* opcode/riscv-opc.h: Defined mask/match encodings and csrs for rvv.
	* opcode/riscv.h: Defined rvv immediate encodings and fields.
	(enum riscv_insn_class): Added INSN_CLASS_V and INSN_CLASS_ZVEF.
	(INSN_V_EEW64): Defined.
	(M_VMSGE, M_VMSGEU): Added for the rvv pseudoes.
opcodes/
	* riscv-dis.c (print_insn_args): Dump the rvv operands.
	* riscv-opc.c (riscv_vecr_names_numeric): Defined rvv registers.
	(riscv_vecm_names_numeric): Likewise.
	(riscv_vsew): Likewise.
	(riscv_vlmul): Likewise.
	(riscv_vta): Likewise.
	(riscv_vma): Likewise.
	(match_vs1_eq_vs2): Added for rvv Vu operand.
	(match_vd_eq_vs1_eq_vs2): Added for rvv Vv operand.
	(riscv_opcodes): Added rvv v1.0 instructions.

include/opcode/riscv.h

@@ -101,6 +101,16 @@ static const char * const riscv_pred_succ[16] =
   ((RV_X(x, 3, 2) << 1) | (RV_X(x, 10, 2) << 3) | (RV_X(x, 2, 1) << 5) | (RV_X(x, 5, 2) << 6) | (-RV_X(x, 12, 1) << 8))
 #define EXTRACT_CJTYPE_IMM(x) \
   ((RV_X(x, 3, 3) << 1) | (RV_X(x, 11, 1) << 4) | (RV_X(x, 2, 1) << 5) | (RV_X(x, 7, 1) << 6) | (RV_X(x, 6, 1) << 7) | (RV_X(x, 9, 2) << 8) | (RV_X(x, 8, 1) << 10) | (-RV_X(x, 12, 1) << 11))
+#define EXTRACT_RVV_VI_IMM(x) \
+  (RV_X(x, 15, 5) | (-RV_X(x, 19, 1) << 5))
+#define EXTRACT_RVV_VI_UIMM(x) \
+  (RV_X(x, 15, 5))
+#define EXTRACT_RVV_OFFSET(x) \
+  (RV_X(x, 29, 3))
+#define EXTRACT_RVV_VB_IMM(x) \
+  (RV_X(x, 20, 10))
+#define EXTRACT_RVV_VC_IMM(x) \
+  (RV_X(x, 20, 11))
 
 #define ENCODE_ITYPE_IMM(x) \
   (RV_X(x, 0, 12) << 20)
@@ -142,6 +152,10 @@ static const char * const riscv_pred_succ[16] =
   ((RV_X(x, 1, 2) << 3) | (RV_X(x, 3, 2) << 10) | (RV_X(x, 5, 1) << 2) | (RV_X(x, 6, 2) << 5) | (RV_X(x, 8, 1) << 12))
 #define ENCODE_CJTYPE_IMM(x) \
   ((RV_X(x, 1, 3) << 3) | (RV_X(x, 4, 1) << 11) | (RV_X(x, 5, 1) << 2) | (RV_X(x, 6, 1) << 7) | (RV_X(x, 7, 1) << 6) | (RV_X(x, 8, 2) << 9) | (RV_X(x, 10, 1) << 8) | (RV_X(x, 11, 1) << 12))
+#define ENCODE_RVV_VB_IMM(x) \
+  (RV_X(x, 0, 10) << 20)
+#define ENCODE_RVV_VC_IMM(x) \
+  (RV_X(x, 0, 11) << 20)
 
 #define VALID_ITYPE_IMM(x) (EXTRACT_ITYPE_IMM(ENCODE_ITYPE_IMM(x)) == (x))
 #define VALID_STYPE_IMM(x) (EXTRACT_STYPE_IMM(ENCODE_STYPE_IMM(x)) == (x))
@@ -165,6 +179,8 @@ static const char * const riscv_pred_succ[16] =
 #define VALID_CLTYPE_LD_IMM(x) (EXTRACT_CLTYPE_LD_IMM(ENCODE_CLTYPE_LD_IMM(x)) == (x))
 #define VALID_CBTYPE_IMM(x) (EXTRACT_CBTYPE_IMM(ENCODE_CBTYPE_IMM(x)) == (x))
 #define VALID_CJTYPE_IMM(x) (EXTRACT_CJTYPE_IMM(ENCODE_CJTYPE_IMM(x)) == (x))
+#define VALID_RVV_VB_IMM(x) (EXTRACT_RVV_VB_IMM(ENCODE_RVV_VB_IMM(x)) == (x))
+#define VALID_RVV_VC_IMM(x) (EXTRACT_RVV_VC_IMM(ENCODE_RVV_VC_IMM(x)) == (x))
 
 #define RISCV_RTYPE(insn, rd, rs1, rs2) \
   ((MATCH_ ## insn) | ((rd) << OP_SH_RD) | ((rs1) << OP_SH_RS1) | ((rs2) << OP_SH_RS2))
@@ -268,6 +284,36 @@ static const char * const riscv_pred_succ[16] =
 #define OP_SH_RNUM      20
 #define OP_MASK_RNUM    0xf
 
+/* RVV fields.  */
+
+#define OP_MASK_VD		0x1f
+#define OP_SH_VD		7
+#define OP_MASK_VS1		0x1f
+#define OP_SH_VS1		15
+#define OP_MASK_VS2		0x1f
+#define OP_SH_VS2		20
+#define OP_MASK_VIMM		0x1f
+#define OP_SH_VIMM		15
+#define OP_MASK_VMASK		0x1
+#define OP_SH_VMASK		25
+#define OP_MASK_VFUNCT6		0x3f
+#define OP_SH_VFUNCT6		26
+#define OP_MASK_VLMUL		0x7
+#define OP_SH_VLMUL		0
+#define OP_MASK_VSEW		0x7
+#define OP_SH_VSEW		3
+#define OP_MASK_VTA		0x1
+#define OP_SH_VTA		6
+#define OP_MASK_VMA		0x1
+#define OP_SH_VMA		7
+#define OP_MASK_VTYPE_RES	0x1
+#define OP_SH_VTYPE_RES		10
+#define OP_MASK_VWD		0x1
+#define OP_SH_VWD		26
+
+#define NVECR 32
+#define NVECM 1
+
 /* ABI names for selected x-registers.  */
 
 #define X_RA 1
@@ -338,6 +384,8 @@ enum riscv_insn_class
   INSN_CLASS_ZBB_OR_ZBKB,
   INSN_CLASS_ZBC_OR_ZBKC,
   INSN_CLASS_ZKND_OR_ZKNE,
+  INSN_CLASS_V,
+  INSN_CLASS_ZVEF,
 };
 
 /* This structure holds information for a particular instruction.  */
@@ -396,6 +444,8 @@ struct riscv_opcode
 #define INSN_JSR		0x00000006
 /* Instruction is a data reference.  */
 #define INSN_DREF		0x00000008
+/* Instruction is allowed when eew >= 64.  */
+#define INSN_V_EEW64		0x10000000
 
 /* We have 5 data reference sizes, which we can encode in 3 bits.  */
 #define INSN_DATA_SIZE		0x00000070
@@ -441,6 +491,8 @@ enum
   M_ZEXTW,
   M_SEXTB,
   M_SEXTH,
+  M_VMSGE,
+  M_VMSGEU,
   M_NUM_MACROS
 };
 
@@ -456,6 +508,12 @@ extern const char * const riscv_gpr_names_numeric[NGPR];
 extern const char * const riscv_gpr_names_abi[NGPR];
 extern const char * const riscv_fpr_names_numeric[NFPR];
 extern const char * const riscv_fpr_names_abi[NFPR];
+extern const char * const riscv_vecr_names_numeric[NVECR];
+extern const char * const riscv_vecm_names_numeric[NVECM];
+extern const char * const riscv_vsew[8];
+extern const char * const riscv_vlmul[8];
+extern const char * const riscv_vta[2];
+extern const char * const riscv_vma[2];
 
 extern const struct riscv_opcode riscv_opcodes[];
 extern const struct riscv_opcode riscv_insn_types[];