* [RFC PATCH] RISC-V: Add Zawrs ISA extension support
@ 2022-06-01 15:35 Christoph Muellner
0 siblings, 0 replies; only message in thread
From: Christoph Muellner @ 2022-06-01 15:35 UTC (permalink / raw)
To: Palmer Dabbelt, Philipp Tomsich, Aaron Durbin, gcc-patches
This patch adds support for the Zawrs ISA extension.
The patch depends on the corresponding Binutils patch
to be usable (see [1])
The specification can be found here:
https://github.com/riscv/riscv-zawrs/blob/main/zawrs.adoc
Note, that the Zawrs extension is not frozen or ratified yet.
Therefore this patch is an RFC and not intended to get merged.
[1] https://sourceware.org/pipermail/binutils/2022-April/120559.html
gcc/ChangeLog:
* common/config/riscv/riscv-common.cc: Add zawrs extension.
* config/riscv/riscv-opts.h (MASK_ZAWRS): New.
(TARGET_ZAWRS): New.
* config/riscv/riscv.opt: New.
gcc/testsuite/ChangeLog:
* gcc.target/riscv/zawrs.c: New test.
Signed-off-by: Christoph Muellner <cmuellner@gcc.gnu.org>
---
gcc/common/config/riscv/riscv-common.cc | 4 ++++
gcc/config/riscv/riscv-opts.h | 3 +++
gcc/config/riscv/riscv.opt | 3 +++
gcc/testsuite/gcc.target/riscv/zawrs.c | 13 +++++++++++++
4 files changed, 23 insertions(+)
create mode 100644 gcc/testsuite/gcc.target/riscv/zawrs.c
diff --git a/gcc/common/config/riscv/riscv-common.cc b/gcc/common/config/riscv/riscv-common.cc
index 0e5be2ce105..7dc5a64006a 100644
--- a/gcc/common/config/riscv/riscv-common.cc
+++ b/gcc/common/config/riscv/riscv-common.cc
@@ -149,6 +149,8 @@ static const struct riscv_ext_version riscv_ext_version_table[] =
{"zifencei", ISA_SPEC_CLASS_20191213, 2, 0},
{"zifencei", ISA_SPEC_CLASS_20190608, 2, 0},
+ {"zawrs", ISA_SPEC_CLASS_NONE, 1, 0},
+
{"zba", ISA_SPEC_CLASS_NONE, 1, 0},
{"zbb", ISA_SPEC_CLASS_NONE, 1, 0},
{"zbc", ISA_SPEC_CLASS_NONE, 1, 0},
@@ -1098,6 +1100,8 @@ 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},
+ {"zawrs", &gcc_options::x_riscv_za_subext, MASK_ZAWRS},
+
{"zba", &gcc_options::x_riscv_zb_subext, MASK_ZBA},
{"zbb", &gcc_options::x_riscv_zb_subext, MASK_ZBB},
{"zbc", &gcc_options::x_riscv_zb_subext, MASK_ZBC},
diff --git a/gcc/config/riscv/riscv-opts.h b/gcc/config/riscv/riscv-opts.h
index 1e153b3a6e7..ced086b955d 100644
--- a/gcc/config/riscv/riscv-opts.h
+++ b/gcc/config/riscv/riscv-opts.h
@@ -73,6 +73,9 @@ enum stack_protector_guard {
#define TARGET_ZICSR ((riscv_zi_subext & MASK_ZICSR) != 0)
#define TARGET_ZIFENCEI ((riscv_zi_subext & MASK_ZIFENCEI) != 0)
+#define MASK_ZAWRS (1 << 0)
+#define TARGET_ZAWRS ((riscv_za_subext & MASK_ZAWRS) != 0)
+
#define MASK_ZBA (1 << 0)
#define MASK_ZBB (1 << 1)
#define MASK_ZBC (1 << 2)
diff --git a/gcc/config/riscv/riscv.opt b/gcc/config/riscv/riscv.opt
index 9e9fe6d8ccd..f01850e3b19 100644
--- a/gcc/config/riscv/riscv.opt
+++ b/gcc/config/riscv/riscv.opt
@@ -197,6 +197,9 @@ long riscv_stack_protector_guard_offset = 0
TargetVariable
int riscv_zi_subext
+TargetVariable
+int riscv_za_subext
+
TargetVariable
int riscv_zb_subext
diff --git a/gcc/testsuite/gcc.target/riscv/zawrs.c b/gcc/testsuite/gcc.target/riscv/zawrs.c
new file mode 100644
index 00000000000..0b7e2662343
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/zawrs.c
@@ -0,0 +1,13 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv64gc_zawrs" { target { rv64 } } } */
+/* { dg-options "-march=rv32gc_zawrs" { target { rv32 } } } */
+
+#ifndef __riscv_zawrs
+#error Feature macro not defined
+#endif
+
+int
+foo (int a)
+{
+ return a;
+}
--
2.35.3
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