[07/12] Use new string hasher for MIPS

[Richard Sandiford <richard dot sandiford at arm dot com>]

Use the string hasher from patch 6 for MIPS.  I split this out because
local_alias_traits doesn't actually need to use SYMBOL_REF rtxes as
the map keys, since the only data used is the symbol name.


gcc/
	* config/mips/mips.c (mips16_flip_traits): Use it.
	(local_alias_traits, mips16_local_aliases): Convert from a map of
	rtxes to a map of symbol names.
	(mips16_local_alias): Update accordingly.

Index: gcc/config/mips/mips.c
===================================================================
--- gcc/config/mips/mips.c	2015-06-23 15:49:32.187081876 +0100
+++ gcc/config/mips/mips.c	2015-06-23 15:49:32.183081933 +0100
@@ -1265,15 +1265,7 @@ static int mips_register_move_cost (mach
 static unsigned int mips_function_arg_boundary (machine_mode, const_tree);
 static machine_mode mips_get_reg_raw_mode (int regno);
 
-struct mips16_flip_traits : default_hashmap_traits
-{
-  static hashval_t hash (const char *s) { return htab_hash_string (s); }
-  static bool
-  equal_keys (const char *a, const char *b)
-  {
-    return !strcmp (a, b);
-  }
-};
+struct mips16_flip_traits : simple_hashmap_traits <nofree_string_hash> {};
 
 /* This hash table keeps track of implicit "mips16" and "nomips16" attributes
    for -mflip_mips16.  It maps decl names onto a boolean mode setting.  */
@@ -6601,30 +6593,13 @@ mips_load_call_address (enum mips_call_t
     }
 }
 
-struct local_alias_traits : default_hashmap_traits
-{
-  static hashval_t hash (rtx);
-  static bool equal_keys (rtx, rtx);
-};
+struct local_alias_traits : simple_hashmap_traits <nofree_string_hash> {};
 
 /* Each locally-defined hard-float MIPS16 function has a local symbol
    associated with it.  This hash table maps the function symbol (FUNC)
    to the local symbol (LOCAL). */
-static GTY (()) hash_map<rtx, rtx, local_alias_traits> *mips16_local_aliases;
-
-/* Hash table callbacks for mips16_local_aliases.  */
-
-hashval_t
-local_alias_traits::hash (rtx func)
-{
-  return htab_hash_string (XSTR (func, 0));
-}
-
-bool
-local_alias_traits::equal_keys (rtx func1, rtx func2)
-{
-  return rtx_equal_p (func1, func2);
-}
+static GTY (()) hash_map<const char *, rtx, local_alias_traits>
+  *mips16_local_aliases;
 
 /* FUNC is the symbol for a locally-defined hard-float MIPS16 function.
    Return a local alias for it, creating a new one if necessary.  */
@@ -6635,23 +6610,23 @@ mips16_local_alias (rtx func)
   /* Create the hash table if this is the first call.  */
   if (mips16_local_aliases == NULL)
     mips16_local_aliases
-      = hash_map<rtx, rtx, local_alias_traits>::create_ggc (37);
+      = hash_map<const char *, rtx, local_alias_traits>::create_ggc (37);
 
   /* Look up the function symbol, creating a new entry if need be.  */
   bool existed;
-  rtx *slot = &mips16_local_aliases->get_or_insert (func, &existed);
+  const char *func_name = XSTR (func, 0);
+  rtx *slot = &mips16_local_aliases->get_or_insert (func_name, &existed);
   gcc_assert (slot != NULL);
 
   if (!existed)
     {
-      const char *func_name, *local_name;
       rtx local;
 
       /* Create a new SYMBOL_REF for the local symbol.  The choice of
 	 __fn_local_* is based on the __fn_stub_* names that we've
 	 traditionally used for the non-MIPS16 stub.  */
       func_name = targetm.strip_name_encoding (XSTR (func, 0));
-      local_name = ACONCAT (("__fn_local_", func_name, NULL));
+      const char *local_name = ACONCAT (("__fn_local_", func_name, NULL));
       local = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (local_name));
       SYMBOL_REF_FLAGS (local) = SYMBOL_REF_FLAGS (func) | SYMBOL_FLAG_LOCAL;