[PATCH] RISC-V: Add an implicit dependency for Zawrs

[Xiao Zeng]

There is a description in 
<https://github.com/riscv/riscv-isa-manual/blob/main/src/zawrs.adoc>:

"The instructions in the Zawrs extension are only useful in conjunction
with the LR instruction, which is provided by the Zalrsc component
of the A extension."

It can be concluded that: zawrs -> zalrsc.

gcc/ChangeLog:

        * common/config/riscv/riscv-common.cc: zawrs -> zalrsc.

gcc/testsuite/ChangeLog:

        * gcc.target/riscv/predef-38.c: New test.
        * gcc.target/riscv/predef-39.c: New test.

Signed-off-by: Xiao Zeng <zengx...@eswincomputing.com>
---
 gcc/common/config/riscv/riscv-common.cc    |  1 +
 gcc/testsuite/gcc.target/riscv/predef-38.c | 31 ++++++++++++++++++++++
 gcc/testsuite/gcc.target/riscv/predef-39.c | 31 ++++++++++++++++++++++
 3 files changed, 63 insertions(+)
 create mode 100644 gcc/testsuite/gcc.target/riscv/predef-38.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/predef-39.c

diff --git a/gcc/common/config/riscv/riscv-common.cc 
b/gcc/common/config/riscv/riscv-common.cc
index bd42fd01532..a6abd903b98 100644
--- a/gcc/common/config/riscv/riscv-common.cc
+++ b/gcc/common/config/riscv/riscv-common.cc
@@ -96,6 +96,7 @@ static const riscv_implied_info_t riscv_implied_info[] =
 
   {"zabha", "zaamo"},
   {"zacas", "zaamo"},
+  {"zawrs", "zalrsc"},
 
   {"zcmop", "zca"},
 
diff --git a/gcc/testsuite/gcc.target/riscv/predef-38.c 
b/gcc/testsuite/gcc.target/riscv/predef-38.c
new file mode 100644
index 00000000000..986c02b451a
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/predef-38.c
@@ -0,0 +1,31 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -march=rv32i_zawrs -mabi=ilp32 -mcmodel=medlow 
-misa-spec=20191213" } */
+
+int main () {
+
+#ifndef __riscv_arch_test
+#error "__riscv_arch_test"
+#endif
+
+#if __riscv_xlen != 32
+#error "__riscv_xlen"
+#endif
+
+#if !defined(__riscv_i)
+#error "__riscv_i"
+#endif
+
+#if !defined(__riscv_zawrs)
+#error "__riscv_zawrs"
+#endif
+
+#if !defined(__riscv_zalrsc)
+#error "__riscv_zalrsc"
+#endif
+
+#if defined(__riscv_a)
+#error "__riscv_a"
+#endif
+
+  return 0;
+}
diff --git a/gcc/testsuite/gcc.target/riscv/predef-39.c 
b/gcc/testsuite/gcc.target/riscv/predef-39.c
new file mode 100644
index 00000000000..558164de8c4
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/predef-39.c
@@ -0,0 +1,31 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -march=rv64i_zawrs -mabi=lp64 -mcmodel=medlow 
-misa-spec=20191213" } */
+
+int main () {
+
+#ifndef __riscv_arch_test
+#error "__riscv_arch_test"
+#endif
+
+#if __riscv_xlen != 64
+#error "__riscv_xlen"
+#endif
+
+#if !defined(__riscv_i)
+#error "__riscv_i"
+#endif
+
+#if !defined(__riscv_zawrs)
+#error "__riscv_zawrs"
+#endif
+
+#if !defined(__riscv_zalrsc)
+#error "__riscv_zalrsc"
+#endif
+
+#if defined(__riscv_a)
+#error "__riscv_a"
+#endif
+
+  return 0;
+}
-- 
2.17.1