[PATCH 2/2] RISC-V: Implications from 'Zc[fd]' extensions

[Tsukasa OI <research_trasio@irq.a4lg.com>]

From: Tsukasa OI <research_trasio@irq.a4lg.com>

The version 1.0.4-1 of the code size reduction specification clarifies
that 'Zcf' implies 'F' and 'Zcd' implies 'D'.

cf:
<https://github.com/riscv/riscv-code-size-reduction/releases/tag/v1.0.4-1>

This commit adds those implications.

bfd/ChangeLog:

	* elfxx-riscv.c (riscv_implicit_subsets): Add two implications,
	'Zcf' -> 'F' and 'Zcd' -> 'D'.

gas/ChangeLog:

	* testsuite/gas/riscv/march-imply-zcd.d: New test.
	* testsuite/gas/riscv/march-imply-zcf.d: New test.
---
 bfd/elfxx-riscv.c                         | 2 ++
 gas/testsuite/gas/riscv/march-imply-zcd.d | 6 ++++++
 gas/testsuite/gas/riscv/march-imply-zcf.d | 6 ++++++
 3 files changed, 14 insertions(+)
 create mode 100644 gas/testsuite/gas/riscv/march-imply-zcd.d
 create mode 100644 gas/testsuite/gas/riscv/march-imply-zcf.d

diff --git a/bfd/elfxx-riscv.c b/bfd/elfxx-riscv.c
index eaf496649db1..b43d2cfa0fab 100644
--- a/bfd/elfxx-riscv.c
+++ b/bfd/elfxx-riscv.c
@@ -1132,6 +1132,8 @@ static struct riscv_implicit_subset riscv_implicit_subsets[] =
   {"zvl256b", "zvl128b",	check_implicit_always},
   {"zvl128b", "zvl64b",		check_implicit_always},
   {"zvl64b", "zvl32b",		check_implicit_always},
+  {"zcd", "d",		check_implicit_always},
+  {"zcf", "f",		check_implicit_always},
   {"zfa", "f",		check_implicit_always},
   {"d", "f",		check_implicit_always},
   {"zfh", "zfhmin",	check_implicit_always},
diff --git a/gas/testsuite/gas/riscv/march-imply-zcd.d b/gas/testsuite/gas/riscv/march-imply-zcd.d
new file mode 100644
index 000000000000..e7c75f649a8b
--- /dev/null
+++ b/gas/testsuite/gas/riscv/march-imply-zcd.d
@@ -0,0 +1,6 @@
+#as: -march=rv32i_zcd -march-attr -misa-spec=20191213
+#readelf: -A
+#source: empty.s
+Attribute Section: riscv
+File Attributes
+  Tag_RISCV_arch: "rv32i2p1_f2p2_d2p2_zicsr2p0_zca1p0_zcd1p0"
diff --git a/gas/testsuite/gas/riscv/march-imply-zcf.d b/gas/testsuite/gas/riscv/march-imply-zcf.d
new file mode 100644
index 000000000000..3829637a16fa
--- /dev/null
+++ b/gas/testsuite/gas/riscv/march-imply-zcf.d
@@ -0,0 +1,6 @@
+#as: -march=rv32i_zcf -march-attr -misa-spec=20191213
+#readelf: -A
+#source: empty.s
+Attribute Section: riscv
+File Attributes
+  Tag_RISCV_arch: "rv32i2p1_f2p2_zicsr2p0_zca1p0_zcf1p0"
-- 
2.41.0