[PATCH 13/14] Add support for the Zvknc ISA extension.

[Nathan Huckleberry <nhuck@google.com>]

Zvknc is part of the vector crypto extensions.

Zvknc is shorthand for the following set of extensxions:
- Zvkn
- Zvbc

Signed-off-by: Nathan Huckleberry <nhuck@google.com>
---
 bfd/elfxx-riscv.c               |  3 +++
 gas/testsuite/gas/riscv/zvknc.d | 18 ++++++++++++++++++
 gas/testsuite/gas/riscv/zvknc.s | 10 ++++++++++
 3 files changed, 31 insertions(+)
 create mode 100644 gas/testsuite/gas/riscv/zvknc.d
 create mode 100644 gas/testsuite/gas/riscv/zvknc.s

diff --git a/bfd/elfxx-riscv.c b/bfd/elfxx-riscv.c
index a1a60d5d4b4..e62508af014 100644
--- a/bfd/elfxx-riscv.c
+++ b/bfd/elfxx-riscv.c
@@ -1161,6 +1161,8 @@ static struct riscv_implicit_subset riscv_implicit_subsets[] =
   {"zvkn", "zvbb",	check_implicit_always},
   {"zvkng", "zvkn",	check_implicit_always},
   {"zvkng", "zvkg",	check_implicit_always},
+  {"zvknc", "zvkn",	check_implicit_always},
+  {"zvknc", "zvbc",	check_implicit_always},
   {"zvks", "zvksed",	check_implicit_always},
   {"zvks", "zvksh",	check_implicit_always},
   {"zvks", "zvbb",	check_implicit_always},
@@ -1275,6 +1277,7 @@ static struct riscv_supported_ext riscv_supported_std_z_ext[] =
   {"zvkg",		ISA_SPEC_CLASS_DRAFT,		1, 0,  0 },
   {"zvkn",		ISA_SPEC_CLASS_DRAFT,		1, 0,  0 },
   {"zvkng",		ISA_SPEC_CLASS_DRAFT,		1, 0,  0 },
+  {"zvknc",		ISA_SPEC_CLASS_DRAFT,		1, 0,  0 },
   {"zvkned",		ISA_SPEC_CLASS_DRAFT,		1, 0,  0 },
   {"zvknha",		ISA_SPEC_CLASS_DRAFT,		1, 0,  0 },
   {"zvknhb",		ISA_SPEC_CLASS_DRAFT,		1, 0,  0 },
diff --git a/gas/testsuite/gas/riscv/zvknc.d b/gas/testsuite/gas/riscv/zvknc.d
new file mode 100644
index 00000000000..f68103b129e
--- /dev/null
+++ b/gas/testsuite/gas/riscv/zvknc.d
@@ -0,0 +1,18 @@
+#as: -march=rv64gc_zvknc
+#objdump: -dr
+
+.*:[ 	]+file format .*
+
+
+Disassembly of section .text:
+0+000 <.text>:
+[ 	]+[0-9a-f]+:[ 	]+a280a277[ 	]+vaesdf.vv[ 	]+v4,v8
+[ 	]+[0-9a-f]+:[ 	]+ba862277[ 	]+vsha2ch.vv[ 	]+v4,v8,v12
+[ 	]+[0-9a-f]+:[ 	]+32862257[ 	+vclmul.vv[ 	]+v4,v8,v12
+[ 	]+[0-9a-f]+:[ 	]+30862257[ 	]+vclmul.vv[ 	]+v4,v8,v12,v0.t
+[ 	]+[0-9a-f]+:[ 	]+3285e257[ 	 ]+vclmul.vx[ 	]+v4,v8,a1
+[ 	]+[0-9a-f]+:[ 	]+3085e257[ 	 ]+vclmul.vx[ 	]+v4,v8,a1,v0.t
+[ 	]+[0-9a-f]+:[ 	]+36862257[ 	 ]+vclmulh.vv[ 	]+v4,v8,v12
+[ 	]+[0-9a-f]+:[ 	]+34862257[ 	 ]+vclmulh.vv[ 	]+v4,v8,v12,v0.t
+[ 	]+[0-9a-f]+:[ 	]+3685e257[ 	 ]+vclmulh.vx[ 	]+v4,v8,a1
+[ 	]+[0-9a-f]+:[ 	]+3485e257[ 	 ]+vclmulh.vx[ 	]+v4,v8,a1,v0.t
diff --git a/gas/testsuite/gas/riscv/zvknc.s b/gas/testsuite/gas/riscv/zvknc.s
new file mode 100644
index 00000000000..60b10d8b8b5
--- /dev/null
+++ b/gas/testsuite/gas/riscv/zvknc.s
@@ -0,0 +1,10 @@
+	vaesdf.vv v4, v8
+	vsha2ch.vv v4, v8, v12
+	vclmul.vv v4, v8, v12
+	vclmul.vv v4, v8, v12, v0.t
+	vclmul.vx v4, v8, a1
+	vclmul.vx v4, v8, a1, v0.t
+	vclmulh.vv v4, v8, v12
+	vclmulh.vv v4, v8, v12, v0.t
+	vclmulh.vx v4, v8, a1
+	vclmulh.vx v4, v8, a1, v0.t
-- 
2.41.0.255.g8b1d071c50-goog