RISC-V: Minimal support for ssnpm, smnpm and smmpm extensions.

This patch support ssnpm, smnpm, smmpm, sspm and supm extensions[1].
To enable GCC to recognize and process ssnpm, smnpm, smmpm, sspm and
supm extensions correctly at compile time.

[1]https://github.com/riscv/riscv-j-extension/blob/master/zjpm/instructions.adoc

Changes for v5:
- Fix the testsuite error in arch-50.c.
Changes for v4:
- Fix the code based on the commit id 9b13bea07706a7cae0185f8a860d67209308c050.
Changes for v3:
- Fix the error messages in gcc/testsuite/gcc.target/riscv/arch-46.c
Changes for v2:
- Add the sspm and supm extensions.
- Add the check_conflict_ext function to check the compatibility of ssnpm, smnpm, smmpm, sspm and supm extensions.
- Add the test cases for ssnpm, smnpm, smmpm, sspm and supm extensions.

gcc/ChangeLog:

	* common/config/riscv/riscv-common.cc
	(riscv_subset_list::check_conflict_ext): New extension.
	* config/riscv/riscv.opt: Ditto.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/arch-ss-1.c: New test.
	* gcc.target/riscv/arch-ss-2.c: New test.

1 files changed, 36 insertions, 0 deletions

diff --git a/gcc/common/config/riscv/riscv-common.cc b/gcc/common/config/riscv/riscv-common.cc
index c89931aa..d3240f7 100644
--- a/gcc/common/config/riscv/riscv-common.cc
+++ b/gcc/common/config/riscv/riscv-common.cc
@@ -262,6 +262,10 @@ static const riscv_implied_info_t riscv_implied_info[] =
   {"ssstateen", "zicsr"},
   {"sstc", "zicsr"},
 
+  {"ssnpm", "zicsr"},
+  {"smnpm", "zicsr"},
+  {"smmpm", "zicsr"},
+
   {"xsfvcp", "zve32x"},
 
   {NULL, NULL}
@@ -457,6 +461,12 @@ static const struct riscv_ext_version riscv_ext_version_table[] =
   {"sstc",      ISA_SPEC_CLASS_NONE, 1, 0},
   {"ssstrict",  ISA_SPEC_CLASS_NONE, 1, 0},
 
+  {"ssnpm",     ISA_SPEC_CLASS_NONE, 1, 0},
+  {"smnpm",     ISA_SPEC_CLASS_NONE, 1, 0},
+  {"smmpm",     ISA_SPEC_CLASS_NONE, 1, 0},
+  {"sspm",      ISA_SPEC_CLASS_NONE, 1, 0},
+  {"supm",      ISA_SPEC_CLASS_NONE, 1, 0},
+
   {"svade",   ISA_SPEC_CLASS_NONE, 1, 0},
   {"svadu",   ISA_SPEC_CLASS_NONE, 1, 0},
   {"svinval", ISA_SPEC_CLASS_NONE, 1, 0},
@@ -1454,6 +1464,26 @@ riscv_subset_list::check_conflict_ext ()
     error_at (m_loc, "%<-march=%s%>: zclsd extension supports in rv32 only",
 	      m_arch);
 
+  if (lookup ("ssnpm") && m_xlen == 32)
+    error_at (m_loc, "%<-march=%s%>: ssnpm extension supports in rv64 only",
+	      m_arch);
+
+  if (lookup ("smnpm") && m_xlen == 32)
+    error_at (m_loc, "%<-march=%s%>: smnpm extension supports in rv64 only",
+	      m_arch);
+
+  if (lookup ("smmpm") && m_xlen == 32)
+    error_at (m_loc, "%<-march=%s%>: smmpm extension supports in rv64 only",
+	      m_arch);
+
+  if (lookup ("sspm") && m_xlen == 32)
+    error_at (m_loc, "%<-march=%s%>: sspm extension supports in rv64 only",
+	      m_arch);
+
+  if (lookup ("supm") && m_xlen == 32)
+    error_at (m_loc, "%<-march=%s%>: supm extension supports in rv64 only",
+	      m_arch);
+
   if (lookup ("zfinx") && lookup ("f"))
     error_at (m_loc,
 	      "%<-march=%s%>: z*inx conflicts with floating-point "
@@ -1888,6 +1918,12 @@ static const riscv_ext_flag_table_t riscv_ext_flag_table[] =
   RISCV_EXT_FLAG_ENTRY ("svnapot",     x_riscv_sv_subext, MASK_SVNAPOT),
   RISCV_EXT_FLAG_ENTRY ("svvptc",      x_riscv_sv_subext, MASK_SVVPTC),
 
+  RISCV_EXT_FLAG_ENTRY ("ssnpm", x_riscv_ss_subext, MASK_SSNPM),
+  RISCV_EXT_FLAG_ENTRY ("smnpm", x_riscv_sm_subext, MASK_SMNPM),
+  RISCV_EXT_FLAG_ENTRY ("smmpm", x_riscv_sm_subext, MASK_SMMPM),
+  RISCV_EXT_FLAG_ENTRY ("sspm", x_riscv_ss_subext, MASK_SSPM),
+  RISCV_EXT_FLAG_ENTRY ("supm", x_riscv_su_subext, MASK_SUPM),
+
   RISCV_EXT_FLAG_ENTRY ("ztso", x_riscv_ztso_subext, MASK_ZTSO),
 
   RISCV_EXT_FLAG_ENTRY ("xcvmac",  x_riscv_xcv_subext, MASK_XCVMAC),