[PATCH v2 1/9] RISC-V: minimal support for xtheadvector

["Jun Sha (Joshua)" <cooper.joshua@linux.alibaba.com>]

This patch is to introduce basic XTheadVector support
(march string parsing and a test for __riscv_xtheadvector)
according to https://github.com/T-head-Semi/thead-extension-spec/

Contributors:
	Jun Sha (Joshua) <cooper.joshua@linux.alibaba.com>
	Jin Ma <jinma@linux.alibaba.com>
	Christoph Müllner <christoph.muellner@vrull.eu>

gcc/ChangeLog:

	* common/config/riscv/riscv-common.cc
	(riscv_subset_list::parse): : Add new vendor extension.
	* config/riscv/riscv-c.cc (riscv_cpu_cpp_builtins):
	Add test marco.
	* config/riscv/riscv.opt: Add new mask.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/predef-__riscv_th_v_intrinsic.c: New test.
	* gcc.target/riscv/rvv/xtheadvector.c: New test.
---
 gcc/common/config/riscv/riscv-common.cc             | 10 ++++++++++
 gcc/config/riscv/riscv-c.cc                         |  4 ++++
 gcc/config/riscv/riscv.opt                          |  2 ++
 .../riscv/predef-__riscv_th_v_intrinsic.c           | 11 +++++++++++
 gcc/testsuite/gcc.target/riscv/rvv/xtheadvector.c   | 13 +++++++++++++
 5 files changed, 40 insertions(+)
 create mode 100644 gcc/testsuite/gcc.target/riscv/predef-__riscv_th_v_intrinsic.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/xtheadvector.c

diff --git a/gcc/common/config/riscv/riscv-common.cc b/gcc/common/config/riscv/riscv-common.cc
index 526dbb7603b..914924171fd 100644
--- a/gcc/common/config/riscv/riscv-common.cc
+++ b/gcc/common/config/riscv/riscv-common.cc
@@ -75,6 +75,8 @@ static const riscv_implied_info_t riscv_implied_info[] =
 
   {"v", "zvl128b"},
   {"v", "zve64d"},
+  {"xtheadvector", "zvl128b"},
+  {"xtheadvector", "zve64d"},
 
   {"zve32f", "f"},
   {"zve64f", "f"},
@@ -325,6 +327,7 @@ static const struct riscv_ext_version riscv_ext_version_table[] =
   {"xtheadmemidx", ISA_SPEC_CLASS_NONE, 1, 0},
   {"xtheadmempair", ISA_SPEC_CLASS_NONE, 1, 0},
   {"xtheadsync", ISA_SPEC_CLASS_NONE, 1, 0},
+  {"xtheadvector", ISA_SPEC_CLASS_NONE, 1, 0},
 
   {"xventanacondops", ISA_SPEC_CLASS_NONE, 1, 0},
 
@@ -1495,6 +1498,10 @@ riscv_subset_list::parse (const char *arch, location_t loc)
     error_at (loc, "%<-march=%s%>: z*inx conflicts with floating-point "
 		   "extensions", arch);
 
+  if (subset_list->lookup ("v") && subset_list->lookup ("xtheadvector"))
+    error_at (loc, "%<-march=%s%>: xtheadvector conflicts with vector "
+		   "extensions", arch);
+
   /* 'H' hypervisor extension requires base ISA with 32 registers.  */
   if (subset_list->lookup ("e") && subset_list->lookup ("h"))
     error_at (loc, "%<-march=%s%>: h extension requires i extension", arch);
@@ -1680,6 +1687,9 @@ static const riscv_ext_flag_table_t riscv_ext_flag_table[] =
   {"xtheadmemidx",  &gcc_options::x_riscv_xthead_subext, MASK_XTHEADMEMIDX},
   {"xtheadmempair", &gcc_options::x_riscv_xthead_subext, MASK_XTHEADMEMPAIR},
   {"xtheadsync",    &gcc_options::x_riscv_xthead_subext, MASK_XTHEADSYNC},
+  {"xtheadvector",  &gcc_options::x_riscv_xthead_subext, MASK_XTHEADVECTOR},
+  {"xtheadvector",  &gcc_options::x_target_flags, MASK_FULL_V},
+  {"xtheadvector",  &gcc_options::x_target_flags, MASK_VECTOR},
 
   {"xventanacondops", &gcc_options::x_riscv_xventana_subext, MASK_XVENTANACONDOPS},
 
diff --git a/gcc/config/riscv/riscv-c.cc b/gcc/config/riscv/riscv-c.cc
index b7f9ba204f7..184fff905b2 100644
--- a/gcc/config/riscv/riscv-c.cc
+++ b/gcc/config/riscv/riscv-c.cc
@@ -137,6 +137,10 @@ riscv_cpu_cpp_builtins (cpp_reader *pfile)
 				     riscv_ext_version_value (0, 11));
     }
 
+   if (TARGET_XTHEADVECTOR)
+     builtin_define_with_int_value ("__riscv_th_v_intrinsic",
+				     riscv_ext_version_value (0, 11));
+
   /* Define architecture extension test macros.  */
   builtin_define_with_int_value ("__riscv_arch_test", 1);
 
diff --git a/gcc/config/riscv/riscv.opt b/gcc/config/riscv/riscv.opt
index 70d78151cee..72857aea352 100644
--- a/gcc/config/riscv/riscv.opt
+++ b/gcc/config/riscv/riscv.opt
@@ -438,6 +438,8 @@ Mask(XTHEADMEMPAIR) Var(riscv_xthead_subext)
 
 Mask(XTHEADSYNC)    Var(riscv_xthead_subext)
 
+Mask(XTHEADVECTOR)  Var(riscv_xthead_subext)
+
 TargetVariable
 int riscv_xventana_subext
 
diff --git a/gcc/testsuite/gcc.target/riscv/predef-__riscv_th_v_intrinsic.c b/gcc/testsuite/gcc.target/riscv/predef-__riscv_th_v_intrinsic.c
new file mode 100644
index 00000000000..1c764241db6
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/predef-__riscv_th_v_intrinsic.c
@@ -0,0 +1,11 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv64imafdcxtheadvector -mabi=lp64d" } */
+
+int main () {
+
+#if __riscv_th_v_intrinsic != 11000
+#error "__riscv_th_v_intrinsic"
+#endif
+
+  return 0;
+}
\ No newline at end of file
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/xtheadvector.c b/gcc/testsuite/gcc.target/riscv/rvv/xtheadvector.c
new file mode 100644
index 00000000000..d52921e1314
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/rvv/xtheadvector.c
@@ -0,0 +1,13 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv32gc_xtheadvector" { target { rv32 } } } */
+/* { dg-options "-march=rv64gc_xtheadvector" { target { rv64 } } } */
+
+#ifndef __riscv_xtheadvector
+#error "Feature macro not defined"
+#endif
+
+int
+foo (int a)
+{
+  return a;
+}
\ No newline at end of file
-- 
2.17.1