RISC-V: Support riscv bitmanip frozen ZBA/ZBB/ZBC instructions (v0.93).

In fact rev8/orc.b/zext.h are the aliases of grevi/gorci/pack[w], so we
should update them to INSN_ALIAS when we have supported their true instruction
in the future.  Though we still use the [MATCH|MAKS]_[GREVI|GORCI|PACK|PACKW]
to encode them.  Besides, the orc.b has the same encoding both in rv32 and
rv64, so we just keep one of them in the opcode table.

This patch is implemented according to the following link,
https://github.com/riscv/riscv-bitmanip/pull/101

2021-01-07  Claire Xenia Wolf  <claire@symbioticeda.com>
            Jim Wilson  <jimw@sifive.com>
            Andrew Waterman  <andrew@sifive.com>
            Maxim Blinov  <maxim.blinov@embecosm.com>
            Kito Cheng  <kito.cheng@sifive.com>
            Nelson Chu  <nelson.chu@sifive.com>

bfd/
    * elfxx-riscv.c (riscv_std_z_ext_strtab): Added zba, zbb and zbc.
gas/
    * config/tc-riscv.c (riscv_multi_subset_supports): Handle INSN_CLASS_ZB*.
    (riscv_get_default_ext_version): Do not check the default_isa_spec when
    the version defined in the riscv_opcodes table is ISA_SPEC_CLASS_DRAFT.
    * testsuite/gas/riscv/bitmanip-insns-32.d: New testcase.
    * testsuite/gas/riscv/bitmanip-insns-64.d: Likewise.
    * testsuite/gas/riscv/bitmanip-insns.s: Likewise.
include/
    * opcode/riscv-opc.h: Added MASK/MATCH/DECLARE_INSN for ZBA/ZBB/ZBC.
    * opcode/riscv.h (riscv_insn_class): Added INSN_CLASS_ZB*.
    (enum riscv_isa_spec_class): Added ISA_SPEC_CLASS_DRAFT for the
    frozen extensions.
opcodes/
    * riscv-opc.c (riscv_opcodes): Add ZBA/ZBB/ZBC instructions.
    (MASK_RVB_IMM): Used for rev8 and orc.b encoding.

3 files changed, 150 insertions, 0 deletions

diff --git a/gas/testsuite/gas/riscv/bitmanip-insns-32.d b/gas/testsuite/gas/riscv/bitmanip-insns-32.d
new file mode 100644
index 0000000..b218f96
--- /dev/null
+++ b/gas/testsuite/gas/riscv/bitmanip-insns-32.d
@@ -0,0 +1,37 @@
+#as: -march=rv32i_zba_zbb_zbc
+#source: bitmanip-insns.s
+#objdump: -dr -Mno-aliases
+
+.*:[ 	]+file format .*
+
+
+Disassembly of section .text:
+
+0+000 <.text>:
+[ 	]+[0-9a-f]+:[ 	]+0805c533[ 	]+zext.h[ 	]+a0,a1
+[ 	]+[0-9a-f]+:[ 	]+6985d513[ 	]+rev8[ 	]+a0,a1
+[ 	]+[0-9a-f]+:[ 	]+2875d513[ 	]+orc.b[ 	]+a0,a1
+[ 	]+[0-9a-f]+:[ 	]+20c5a533[ 	]+sh1add[ 	]+a0,a1,a2
+[ 	]+[0-9a-f]+:[ 	]+20c5c533[ 	]+sh2add[ 	]+a0,a1,a2
+[ 	]+[0-9a-f]+:[ 	]+20c5e533[ 	]+sh3add[ 	]+a0,a1,a2
+[ 	]+[0-9a-f]+:[ 	]+60059513[ 	]+clz[ 	]+a0,a1
+[ 	]+[0-9a-f]+:[ 	]+60159513[ 	]+ctz[ 	]+a0,a1
+[ 	]+[0-9a-f]+:[ 	]+60259513[ 	]+cpop[ 	]+a0,a1
+[ 	]+[0-9a-f]+:[ 	]+0ac5c533[ 	]+min[ 	]+a0,a1,a2
+[ 	]+[0-9a-f]+:[ 	]+0ac5e533[ 	]+max[ 	]+a0,a1,a2
+[ 	]+[0-9a-f]+:[ 	]+0ac5d533[ 	]+minu[ 	]+a0,a1,a2
+[ 	]+[0-9a-f]+:[ 	]+0ac5f533[ 	]+maxu[ 	]+a0,a1,a2
+[ 	]+[0-9a-f]+:[ 	]+60459513[ 	]+sext.b[ 	]+a0,a1
+[ 	]+[0-9a-f]+:[ 	]+60559513[ 	]+sext.h[ 	]+a0,a1
+[ 	]+[0-9a-f]+:[ 	]+40c5f533[ 	]+andn[ 	]+a0,a1,a2
+[ 	]+[0-9a-f]+:[ 	]+40c5e533[ 	]+orn[ 	]+a0,a1,a2
+[ 	]+[0-9a-f]+:[ 	]+00c5c533[ 	]+xor[ 	]+a0,a1,a2
+[ 	]+[0-9a-f]+:[ 	]+6005d513[ 	]+rori[ 	]+a0,a1,0x0
+[ 	]+[0-9a-f]+:[ 	]+61f5d513[ 	]+rori[ 	]+a0,a1,0x1f
+[ 	]+[0-9a-f]+:[ 	]+60c5d533[ 	]+ror[ 	]+a0,a1,a2
+[ 	]+[0-9a-f]+:[ 	]+6005d513[ 	]+rori[ 	]+a0,a1,0x0
+[ 	]+[0-9a-f]+:[ 	]+61f5d513[ 	]+rori[ 	]+a0,a1,0x1f
+[ 	]+[0-9a-f]+:[ 	]+60c59533[ 	]+rol[ 	]+a0,a1,a2
+[ 	]+[0-9a-f]+:[ 	]+0ac59533[ 	]+clmul[ 	]+a0,a1,a2
+[ 	]+[0-9a-f]+:[ 	]+0ac5b533[ 	]+clmulh[ 	]+a0,a1,a2
+[ 	]+[0-9a-f]+:[ 	]+0ac5a533[ 	]+clmulr[ 	]+a0,a1,a2
diff --git a/gas/testsuite/gas/riscv/bitmanip-insns-64.d b/gas/testsuite/gas/riscv/bitmanip-insns-64.d
new file mode 100644
index 0000000..9914f3e
--- /dev/null
+++ b/gas/testsuite/gas/riscv/bitmanip-insns-64.d
@@ -0,0 +1,55 @@
+#as: -march=rv64i_zba_zbb_zbc -defsym __64_bit__=1
+#source: bitmanip-insns.s
+#objdump: -dr -Mno-aliases
+
+.*:[ 	]+file format .*
+
+
+Disassembly of section .text:
+
+0+000 <.text>:
+[ 	]+[0-9a-f]+:[ 	]+0805c53b[ 	]+zext.h[ 	]+a0,a1
+[ 	]+[0-9a-f]+:[ 	]+6b85d513[ 	]+rev8[ 	]+a0,a1
+[ 	]+[0-9a-f]+:[ 	]+2875d513[ 	]+orc.b[ 	]+a0,a1
+[ 	]+[0-9a-f]+:[ 	]+0805853b[ 	]+add.uw[ 	]+a0,a1,zero
+[ 	]+[0-9a-f]+:[ 	]+20c5a533[ 	]+sh1add[ 	]+a0,a1,a2
+[ 	]+[0-9a-f]+:[ 	]+20c5c533[ 	]+sh2add[ 	]+a0,a1,a2
+[ 	]+[0-9a-f]+:[ 	]+20c5e533[ 	]+sh3add[ 	]+a0,a1,a2
+[ 	]+[0-9a-f]+:[ 	]+20c5a53b[ 	]+sh1add.uw[ 	]+a0,a1,a2
+[ 	]+[0-9a-f]+:[ 	]+20c5c53b[ 	]+sh2add.uw[ 	]+a0,a1,a2
+[ 	]+[0-9a-f]+:[ 	]+20c5e53b[ 	]+sh3add.uw[ 	]+a0,a1,a2
+[ 	]+[0-9a-f]+:[ 	]+08c5853b[ 	]+add.uw[ 	]+a0,a1,a2
+[ 	]+[0-9a-f]+:[ 	]+0805951b[ 	]+slli.uw[ 	]+a0,a1,0x0
+[ 	]+[0-9a-f]+:[ 	]+0bf5951b[ 	]+slli.uw[ 	]+a0,a1,0x3f
+[ 	]+[0-9a-f]+:[ 	]+60059513[ 	]+clz[ 	]+a0,a1
+[ 	]+[0-9a-f]+:[ 	]+60159513[ 	]+ctz[ 	]+a0,a1
+[ 	]+[0-9a-f]+:[ 	]+60259513[ 	]+cpop[ 	]+a0,a1
+[ 	]+[0-9a-f]+:[ 	]+0ac5c533[ 	]+min[ 	]+a0,a1,a2
+[ 	]+[0-9a-f]+:[ 	]+0ac5e533[ 	]+max[ 	]+a0,a1,a2
+[ 	]+[0-9a-f]+:[ 	]+0ac5d533[ 	]+minu[ 	]+a0,a1,a2
+[ 	]+[0-9a-f]+:[ 	]+0ac5f533[ 	]+maxu[ 	]+a0,a1,a2
+[ 	]+[0-9a-f]+:[ 	]+60459513[ 	]+sext.b[ 	]+a0,a1
+[ 	]+[0-9a-f]+:[ 	]+60559513[ 	]+sext.h[ 	]+a0,a1
+[ 	]+[0-9a-f]+:[ 	]+40c5f533[ 	]+andn[ 	]+a0,a1,a2
+[ 	]+[0-9a-f]+:[ 	]+40c5e533[ 	]+orn[ 	]+a0,a1,a2
+[ 	]+[0-9a-f]+:[ 	]+00c5c533[ 	]+xor[ 	]+a0,a1,a2
+[ 	]+[0-9a-f]+:[ 	]+6005d513[ 	]+rori[ 	]+a0,a1,0x0
+[ 	]+[0-9a-f]+:[ 	]+61f5d513[ 	]+rori[ 	]+a0,a1,0x1f
+[ 	]+[0-9a-f]+:[ 	]+60c5d533[ 	]+ror[ 	]+a0,a1,a2
+[ 	]+[0-9a-f]+:[ 	]+6005d513[ 	]+rori[ 	]+a0,a1,0x0
+[ 	]+[0-9a-f]+:[ 	]+61f5d513[ 	]+rori[ 	]+a0,a1,0x1f
+[ 	]+[0-9a-f]+:[ 	]+60c59533[ 	]+rol[ 	]+a0,a1,a2
+[ 	]+[0-9a-f]+:[ 	]+6005951b[ 	]+clzw[ 	]+a0,a1
+[ 	]+[0-9a-f]+:[ 	]+6015951b[ 	]+ctzw[ 	]+a0,a1
+[ 	]+[0-9a-f]+:[ 	]+6025951b[ 	]+cpopw[ 	]+a0,a1
+[ 	]+[0-9a-f]+:[ 	]+63f5d513[ 	]+rori[ 	]+a0,a1,0x3f
+[ 	]+[0-9a-f]+:[ 	]+63f5d513[ 	]+rori[ 	]+a0,a1,0x3f
+[ 	]+[0-9a-f]+:[ 	]+6005d51b[ 	]+roriw[ 	]+a0,a1,0x0
+[ 	]+[0-9a-f]+:[ 	]+61f5d51b[ 	]+roriw[ 	]+a0,a1,0x1f
+[ 	]+[0-9a-f]+:[ 	]+60c5d53b[ 	]+rorw[ 	]+a0,a1,a2
+[ 	]+[0-9a-f]+:[ 	]+6005d51b[ 	]+roriw[ 	]+a0,a1,0x0
+[ 	]+[0-9a-f]+:[ 	]+61f5d51b[ 	]+roriw[ 	]+a0,a1,0x1f
+[ 	]+[0-9a-f]+:[ 	]+60c5953b[ 	]+rolw[ 	]+a0,a1,a2
+[ 	]+[0-9a-f]+:[ 	]+0ac59533[ 	]+clmul[ 	]+a0,a1,a2
+[ 	]+[0-9a-f]+:[ 	]+0ac5b533[ 	]+clmulh[ 	]+a0,a1,a2
+[ 	]+[0-9a-f]+:[ 	]+0ac5a533[ 	]+clmulr[ 	]+a0,a1,a2
diff --git a/gas/testsuite/gas/riscv/bitmanip-insns.s b/gas/testsuite/gas/riscv/bitmanip-insns.s
new file mode 100644
index 0000000..b14e89c
--- /dev/null
+++ b/gas/testsuite/gas/riscv/bitmanip-insns.s
@@ -0,0 +1,58 @@
+	# pseudo/aliaese
+	zext.h	a0, a1
+	rev8	a0, a1
+	orc.b	a0, a1
+.ifdef __64_bit__
+	zext.w	a0, a1
+.endif
+
+	# ZBA
+	sh1add	a0, a1, a2
+	sh2add	a0, a1, a2
+	sh3add	a0, a1, a2
+.ifdef __64_bit__
+	sh1add.uw	a0, a1, a2
+	sh2add.uw	a0, a1, a2
+	sh3add.uw	a0, a1, a2
+	add.uw		a0, a1, a2
+	slli.uw		a0, a1, 0
+	slli.uw		a0, a1, 63
+.endif
+
+	# ZBB
+	clz	a0, a1
+	ctz	a0, a1
+	cpop	a0, a1
+	min	a0, a1, a2
+	max	a0, a1, a2
+	minu	a0, a1, a2
+	maxu	a0, a1, a2
+	sext.b	a0, a1
+	sext.h	a0, a1
+	andn	a0, a1, a2
+	orn	a0, a1, a2
+	xor	a0, a1, a2
+	rori	a0, a1, 0
+	rori	a0, a1, 31
+	ror	a0, a1, a2
+	ror	a0, a1, 0
+	ror	a0, a1, 31
+	rol	a0, a1, a2
+.ifdef __64_bit__
+	clzw	a0, a1
+	ctzw	a0, a1
+	cpopw	a0, a1
+	rori	a0, a1, 63
+	ror	a0, a1, 63
+	roriw	a0, a1, 0
+	roriw	a0, a1, 31
+	rorw	a0, a1, a2
+	rorw	a0, a1, 0
+	rorw	a0, a1, 31
+	rolw	a0, a1, a2
+.endif
+
+	# ZBC
+	clmul	a0, a1, a2
+	clmulh	a0, a1, a2
+	clmulr	a0, a1, a2