RISC-V: Add SiFive extensions, xsfvcp and xsfcease

We have already upstreamed these extensions into binutils, and now we need GCC
to recognize these extensions and pass them to binutils as well. We also plan
to upstream intrinsics in the near future. :)

gcc/ChangeLog:

	* common/config/riscv/riscv-common.cc (riscv_implied_info): Add xsfvcp.
	(riscv_ext_version_table): Add xsfvcp, xsfcease.
	(riscv_ext_flag_table): Ditto.
	* config/riscv/riscv.opt (riscv_sifive_subext): New.
	(XSFVCP): New.
	(XSFCEASE): New.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/predef-sf-1.c: New.
	* gcc.target/riscv/predef-sf-2.c: New.

4 files changed, 48 insertions, 0 deletions

diff --git a/gcc/common/config/riscv/riscv-common.cc b/gcc/common/config/riscv/riscv-common.cc
index 3c4178c..d883efa 100644
--- a/gcc/common/config/riscv/riscv-common.cc
+++ b/gcc/common/config/riscv/riscv-common.cc
@@ -216,6 +216,8 @@ static const riscv_implied_info_t riscv_implied_info[] =
   {"ssstateen", "zicsr"},
   {"sstc", "zicsr"},
 
+  {"xsfvcp", "zve32x"},
+
   {NULL, NULL}
 };
 
@@ -415,6 +417,9 @@ static const struct riscv_ext_version riscv_ext_version_table[] =
 
   {"xventanacondops", ISA_SPEC_CLASS_NONE, 1, 0},
 
+  {"xsfvcp",   ISA_SPEC_CLASS_NONE, 1, 0},
+  {"xsfcease", ISA_SPEC_CLASS_NONE, 1, 0},
+
   /* Terminate the list.  */
   {NULL, ISA_SPEC_CLASS_NONE, 0, 0}
 };
@@ -1822,6 +1827,9 @@ static const riscv_ext_flag_table_t riscv_ext_flag_table[] =
 
   {"xventanacondops", &gcc_options::x_riscv_xventana_subext, MASK_XVENTANACONDOPS},
 
+  {"xsfvcp",   &gcc_options::x_riscv_sifive_subext, MASK_XSFVCP},
+  {"xsfcease", &gcc_options::x_riscv_sifive_subext, MASK_XSFCEASE},
+
   {NULL, NULL, 0}
 };
 
diff --git a/gcc/config/riscv/riscv.opt b/gcc/config/riscv/riscv.opt
index 32a0dda..a1d70b63 100644
--- a/gcc/config/riscv/riscv.opt
+++ b/gcc/config/riscv/riscv.opt
@@ -507,6 +507,13 @@ int riscv_xventana_subext
 
 Mask(XVENTANACONDOPS) Var(riscv_xventana_subext)
 
+TargetVariable
+int riscv_sifive_subext
+
+Mask(XSFVCP) Var(riscv_sifive_subext)
+
+Mask(XSFCEASE) Var(riscv_sifive_subext)
+
 Enum
 Name(isa_spec_class) Type(enum riscv_isa_spec_class)
 Supported ISA specs (for use with the -misa-spec= option):
diff --git a/gcc/testsuite/gcc.target/riscv/predef-sf-1.c b/gcc/testsuite/gcc.target/riscv/predef-sf-1.c
new file mode 100644
index 0000000..d6c07e7
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/predef-sf-1.c
@@ -0,0 +1,19 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv64g_xsfvcp -mabi=lp64" } */
+
+int main () {
+#if !defined(__riscv)
+#error "__riscv"
+#endif
+
+#if !defined(__riscv_zve32x)
+#error "__riscv_zve32x"
+#endif
+
+
+#if !defined(__riscv_xsfvcp)
+#error "__riscv_xsfvcp"
+#endif
+
+  return 0;
+}
diff --git a/gcc/testsuite/gcc.target/riscv/predef-sf-2.c b/gcc/testsuite/gcc.target/riscv/predef-sf-2.c
new file mode 100644
index 0000000..dcb746b
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/predef-sf-2.c
@@ -0,0 +1,14 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv64g_xsfcease -mabi=lp64" } */
+
+int main () {
+#if !defined(__riscv)
+#error "__riscv"
+#endif
+
+#if !defined(__riscv_xsfcease)
+#error "__riscv_xsfvcp"
+#endif
+
+  return 0;
+}