[PATCH] Add MD Function type check for builtin_md vectorize

[Xiong Hu Luo]

The DECL_MD_FUNCTION_CODE added in r274404(PR 91421) by rsandifo requires that
DECL to be a BUILTIN_IN_MD class built-in, asserts will happen when lto
as the patch r274411(PR 91287) outputs some math function symbol to the object,
this patch will check function type before do builtin_md vectorize.

gcc/ChangeLog

2019-08-21  Xiong Hu Luo  <luo...@linux.ibm.com>

        * tree-vect-stmts.c (vectorizable_call): Check callee built-in type.
        * gcc/tree.h (DECL_MD_FUNCTION_P): New function.
---
 gcc/tree-vect-stmts.c |  2 +-
 gcc/tree.h            | 12 ++++++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/gcc/tree-vect-stmts.c b/gcc/tree-vect-stmts.c
index 1e2dfe5d22d..ef947f20d63 100644
--- a/gcc/tree-vect-stmts.c
+++ b/gcc/tree-vect-stmts.c
@@ -3376,7 +3376,7 @@ vectorizable_call (stmt_vec_info stmt_info, 
gimple_stmt_iterator *gsi,
       if (cfn != CFN_LAST)
        fndecl = targetm.vectorize.builtin_vectorized_function
          (cfn, vectype_out, vectype_in);
-      else if (callee)
+      else if (callee && DECL_MD_FUNCTION_P (callee))
        fndecl = targetm.vectorize.builtin_md_vectorized_function
          (callee, vectype_out, vectype_in);
     }
diff --git a/gcc/tree.h b/gcc/tree.h
index b910c5cb475..8cce89e5cf3 100644
--- a/gcc/tree.h
+++ b/gcc/tree.h
@@ -3905,6 +3905,18 @@ DECL_MD_FUNCTION_CODE (const_tree decl)
   return fndecl.function_code;
 }
 
+/* Return true if decl is a FUNCTION_DECL with built-in class BUILT_IN_MD.
+   Otherwise return false.  */
+inline bool
+DECL_MD_FUNCTION_P (const_tree decl)
+{
+  const tree_function_decl &fndecl = FUNCTION_DECL_CHECK (decl)->function_decl;
+  if (fndecl.built_in_class == BUILT_IN_MD)
+    return true;
+  else
+    return false;
+}
+
 /* Return the frontend-specific built-in function that DECL represents,
    given that it is known to be a FUNCTION_DECL with built-in class
    BUILT_IN_FRONTEND.  */
-- 
2.22.0.428.g6d5b264208