[PATCH 1/5] [RISC-V] Recognize Zicond extension

[Xiao Zeng]

This patch is the minimal support for Zicond extension, include
the extension name, mask and target defination.

gcc/ChangeLog:

        * common/config/riscv/riscv-common.cc: New extension.
        * config/riscv/riscv-opts.h (MASK_ZICOND): New mask.
        (TARGET_ZICOND): New target.

gcc/testsuite/ChangeLog:

        * gcc.target/riscv/attribute-20.c: New test.
        * gcc.target/riscv/attribute-21.c: New test.
---
 gcc/common/config/riscv/riscv-common.cc       | 3 +++
 gcc/config/riscv/riscv-opts.h                 | 3 +++
 gcc/testsuite/gcc.target/riscv/attribute-20.c | 6 ++++++
 gcc/testsuite/gcc.target/riscv/attribute-21.c | 6 ++++++
 4 files changed, 18 insertions(+)
 create mode 100644 gcc/testsuite/gcc.target/riscv/attribute-20.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/attribute-21.c

diff --git a/gcc/common/config/riscv/riscv-common.cc 
b/gcc/common/config/riscv/riscv-common.cc
index 6091d8f281b..8460d83b0f1 100644
--- a/gcc/common/config/riscv/riscv-common.cc
+++ b/gcc/common/config/riscv/riscv-common.cc
@@ -183,6 +183,8 @@ static const struct riscv_ext_version 
riscv_ext_version_table[] =
   {"zifencei", ISA_SPEC_CLASS_20191213, 2, 0},
   {"zifencei", ISA_SPEC_CLASS_20190608, 2, 0},
 
+  {"zicond", ISA_SPEC_CLASS_NONE, 1, 0},
+
   {"zawrs", ISA_SPEC_CLASS_NONE, 1, 0},
 
   {"zba", ISA_SPEC_CLASS_NONE, 1, 0},
@@ -1243,6 +1245,7 @@ static const riscv_ext_flag_table_t 
riscv_ext_flag_table[] =
 
   {"zicsr",    &gcc_options::x_riscv_zi_subext, MASK_ZICSR},
   {"zifencei", &gcc_options::x_riscv_zi_subext, MASK_ZIFENCEI},
+  {"zicond",   &gcc_options::x_riscv_zi_subext, MASK_ZICOND},
 
   {"zawrs", &gcc_options::x_riscv_za_subext, MASK_ZAWRS},
 
diff --git a/gcc/config/riscv/riscv-opts.h b/gcc/config/riscv/riscv-opts.h
index cfcf608ea62..cecaee7d200 100644
--- a/gcc/config/riscv/riscv-opts.h
+++ b/gcc/config/riscv/riscv-opts.h
@@ -236,6 +236,9 @@ enum riscv_entity
 #define TARGET_ZICBOM ((riscv_zicmo_subext & MASK_ZICBOM) != 0)
 #define TARGET_ZICBOP ((riscv_zicmo_subext & MASK_ZICBOP) != 0)
 
+#define MASK_ZICOND   (1 << 2)
+#define TARGET_ZICOND ((riscv_zi_subext & MASK_ZICOND) != 0)
+
 #define MASK_ZFHMIN   (1 << 0)
 #define MASK_ZFH      (1 << 1)
 #define MASK_ZVFHMIN  (1 << 2)
diff --git a/gcc/testsuite/gcc.target/riscv/attribute-20.c 
b/gcc/testsuite/gcc.target/riscv/attribute-20.c
new file mode 100644
index 00000000000..b69c36cf4f1
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/attribute-20.c
@@ -0,0 +1,6 @@
+/* { dg-do compile } */
+/* { dg-options "-mriscv-attribute -march=rv32i_zicond -mabi=ilp32" } */
+
+void foo(){}
+
+/* { dg-final { scan-assembler ".attribute arch, \"rv32i2p1_zicond1p0\"" } } */
diff --git a/gcc/testsuite/gcc.target/riscv/attribute-21.c 
b/gcc/testsuite/gcc.target/riscv/attribute-21.c
new file mode 100644
index 00000000000..160312a0d48
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/attribute-21.c
@@ -0,0 +1,6 @@
+/* { dg-do compile } */
+/* { dg-options "-mriscv-attribute -march=rv64i_zicond -mabi=lp64" } */
+
+void foo(){}
+
+/* { dg-final { scan-assembler ".attribute arch, \"rv64i2p1_zicond1p0\"" } } */
-- 
2.17.1