RISC-V: Ensure all implied extensions are included [PR110696]

This patch fix target/PR110696, recursively add all implied extensions.

	PR target/110696

gcc/ChangeLog:

	* common/config/riscv/riscv-common.cc (riscv_subset_list::handle_implied_ext):
	recur add all implied extensions.
	(riscv_subset_list::check_implied_ext): Add new method.
	(riscv_subset_list::parse): Call checker check_implied_ext.
	* config/riscv/riscv-subset.h: Add new method.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/attribute-20.c: New test.
	* gcc.target/riscv/pr110696.c: New test.

Signed-off-by: Lehua Ding <lehua.ding@rivai.ai>

4 files changed, 46 insertions, 4 deletions

diff --git a/gcc/common/config/riscv/riscv-common.cc b/gcc/common/config/riscv/riscv-common.cc
index 28c8f0c..19075c0 100644
--- a/gcc/common/config/riscv/riscv-common.cc
+++ b/gcc/common/config/riscv/riscv-common.cc
@@ -949,14 +949,14 @@ riscv_subset_list::parse_std_ext (const char *p)
 
 /* Check any implied extensions for EXT.  */
 void
-riscv_subset_list::handle_implied_ext (riscv_subset_t *ext)
+riscv_subset_list::handle_implied_ext (const char *ext)
 {
   const riscv_implied_info_t *implied_info;
   for (implied_info = &riscv_implied_info[0];
        implied_info->ext;
        ++implied_info)
     {
-      if (strcmp (ext->name.c_str (), implied_info->ext) != 0)
+      if (strcmp (ext, implied_info->ext) != 0)
 	continue;
 
       /* Skip if implied extension already present.  */
@@ -966,6 +966,9 @@ riscv_subset_list::handle_implied_ext (riscv_subset_t *ext)
       /* Version of implied extension will get from current ISA spec
 	 version.  */
       add (implied_info->implied_ext, true);
+
+      /* Recursively add implied extension by implied_info->implied_ext.  */
+      handle_implied_ext (implied_info->implied_ext);
     }
 
   /* For RISC-V ISA version 2.2 or earlier version, zicsr and zifence is
@@ -980,6 +983,27 @@ riscv_subset_list::handle_implied_ext (riscv_subset_t *ext)
     }
 }
 
+/* Check that all implied extensions are included.  */
+bool
+riscv_subset_list::check_implied_ext ()
+{
+  riscv_subset_t *itr;
+  for (itr = m_head; itr != NULL; itr = itr->next)
+    {
+      const riscv_implied_info_t *implied_info;
+      for (implied_info = &riscv_implied_info[0]; implied_info->ext;
+	   ++implied_info)
+	{
+	  if (strcmp (itr->name.c_str(), implied_info->ext) != 0)
+	    continue;
+
+	  if (!lookup (implied_info->implied_ext))
+	    return false;
+	}
+    }
+  return true;
+}
+
 /* Check any combine extensions for EXT.  */
 void
 riscv_subset_list::handle_combine_ext ()
@@ -1194,9 +1218,12 @@ riscv_subset_list::parse (const char *arch, location_t loc)
 
   for (itr = subset_list->m_head; itr != NULL; itr = itr->next)
     {
-      subset_list->handle_implied_ext (itr);
+      subset_list->handle_implied_ext (itr->name.c_str ());
     }
 
+  /* Make sure all implied extensions are included. */
+  gcc_assert (subset_list->check_implied_ext ());
+
   subset_list->handle_combine_ext ();
 
   if (subset_list->lookup ("zfinx") && subset_list->lookup ("f"))
diff --git a/gcc/config/riscv/riscv-subset.h b/gcc/config/riscv/riscv-subset.h
index 92e4fb3..84a7a82 100644
--- a/gcc/config/riscv/riscv-subset.h
+++ b/gcc/config/riscv/riscv-subset.h
@@ -67,7 +67,8 @@ private:
   const char *parse_multiletter_ext (const char *, const char *,
 				     const char *);
 
-  void handle_implied_ext (riscv_subset_t *);
+  void handle_implied_ext (const char *);
+  bool check_implied_ext ();
   void handle_combine_ext ();
 
 public:
diff --git a/gcc/testsuite/gcc.target/riscv/attribute-20.c b/gcc/testsuite/gcc.target/riscv/attribute-20.c
new file mode 100644
index 0000000..f7d0b29
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/attribute-20.c
@@ -0,0 +1,7 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv64gcv_zvl65536b -mabi=lp64d" } */
+int foo()
+{
+}
+
+/* { dg-final { scan-assembler ".attribute arch, \"rv64i2p1_m2p0_a2p1_f2p2_d2p2_c2p0_v1p0_zicsr2p0_zifencei2p0_zve32f1p0_zve32x1p0_zve64d1p0_zve64f1p0_zve64x1p0_zvl1024b1p0_zvl128b1p0_zvl16384b1p0_zvl2048b1p0_zvl256b1p0_zvl32768b1p0_zvl32b1p0_zvl4096b1p0_zvl512b1p0_zvl64b1p0_zvl65536b1p0_zvl8192b1p0\"" } } */
diff --git a/gcc/testsuite/gcc.target/riscv/pr110696.c b/gcc/testsuite/gcc.target/riscv/pr110696.c
new file mode 100644
index 0000000..a630f04
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/pr110696.c
@@ -0,0 +1,7 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv64gcv_zvl4096b -mabi=lp64d" } */
+int foo()
+{
+}
+
+/* { dg-final { scan-assembler ".attribute arch, \"rv64i2p1_m2p0_a2p1_f2p2_d2p2_c2p0_v1p0_zicsr2p0_zifencei2p0_zve32f1p0_zve32x1p0_zve64d1p0_zve64f1p0_zve64x1p0_zvl1024b1p0_zvl128b1p0_zvl2048b1p0_zvl256b1p0_zvl32b1p0_zvl4096b1p0_zvl512b1p0_zvl64b1p0\"" } } */