md.texi (define_enum_attr): Document.

gcc/
	* doc/md.texi (define_enum_attr): Document.
	* rtl.def (DEFINE_ENUM_ATTR): New rtx.
	* read-md.h (lookup_enum_type): Declare.
	* read-md.c (lookup_enum_type): New function.
	* genattr.c (gen_attr, main): Handle DEFINE_ENUM_ATTR.
	* genattrtab.c (attr_desc): Add an enum_name field.
	(evaluate_eq_attr): Take the associated attribute as argument.
	Get the enum prefix from the enum_name field, if defined.
	Use ACONCAT rather than a fixed-length buffer.  Update recursive calls.
	(simplify_test_exp): Pass attr to evaluate_eq_attr.
	(add_attr_value): New function, split out from...
	(gen_attr): ...here.  Handle DEFINE_ENUM_ATTR.
	(write_test_expr): Pass attr to evaluate_eq_attr.
	(write_attr_get): Use the enum_name as the enum tag, if defined.
	(write_attr_valueq): Use the enum_name as a prefix, if defined.
	(find_attr): Initialize enum_name.
	(main): Handle DEFINE_ENUM_ATTR.
	* gensupport.c (process_rtx): Likewise.
	* config/mips/mips.h (mips_tune_attr): Delete.
	* config/mips/mips.md (cpu): Use define_attr_enum.

From-SVN: r160581

1 files changed, 8 insertions, 0 deletions

diff --git a/gcc/read-md.c b/gcc/read-md.c
index 90707b3..9c62291 100644
--- a/gcc/read-md.c
+++ b/gcc/read-md.c
@@ -847,6 +847,14 @@ handle_enum (int lineno, bool md_p)
     }
 }
 
+/* Try to find the definition of the given enum.  Return null on failure.  */
+
+struct enum_type *
+lookup_enum_type (const char *name)
+{
+  return (struct enum_type *) htab_find (enum_types, &name);
+}
+
 /* For every enum definition, call CALLBACK with two arguments:
    a pointer to the constant definition and INFO.  Stop when CALLBACK
    returns zero.  */