Update.

	* ctype/Versions: Add __ctype32_tolower and __ctype32_toupper.
	* ctype/ctype-info.c: Define __ctype32_tolower and __ctype32_toupper.
	* locale/C-ctype.c: Add _nl_C_LC_CTYPE_toupper32 and
	_nl_C_LC_CTYPE_tolower32 tables.
	Don't compile it names of 14652 classes and maps.
	* locale/langinfo.h: Define _NL_CTYPE_TOUPPER32 and
	_NL_CTYPE_TOLOWER32.
	* locale/lc-ctype.c (_nl_postload_ctype): Initialize __ctype32_toupper
	and __ctype32_tolower.
	* locale/programs/ld-ctype.c (struct locale_ctype_t): Add map32.
	(ctype_output): Write out map32 values.
	(allocate_arrays): Compute mapping tables correctly.
	* wctype/wcfuncs.c (towlower): Use __ctype32_tolower.
	(towupper): Use __ctype32_toupper.
	* wctype/wctype.h: Optimize towupper and towlower for values < 256.

9 files changed, 168 insertions, 23 deletions

diff --git a/ChangeLog b/ChangeLog
index 9d4ea7ce71..89888a6fc2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,21 @@
 1999-12-08  Ulrich Drepper  <drepper@cygnus.com>
 
+	* ctype/Versions: Add __ctype32_tolower and __ctype32_toupper.
+	* ctype/ctype-info.c: Define __ctype32_tolower and __ctype32_toupper.
+	* locale/C-ctype.c: Add _nl_C_LC_CTYPE_toupper32 and
+	_nl_C_LC_CTYPE_tolower32 tables.
+	Don't compile it names of 14652 classes and maps.
+	* locale/langinfo.h: Define _NL_CTYPE_TOUPPER32 and
+	_NL_CTYPE_TOLOWER32.
+	* locale/lc-ctype.c (_nl_postload_ctype): Initialize __ctype32_toupper
+	and __ctype32_tolower.
+	* locale/programs/ld-ctype.c (struct locale_ctype_t): Add map32.
+	(ctype_output): Write out map32 values.
+	(allocate_arrays): Compute mapping tables correctly.
+	* wctype/wcfuncs.c (towlower): Use __ctype32_tolower.
+	(towupper): Use __ctype32_toupper.
+	* wctype/wctype.h: Optimize towupper and towlower for values < 256.
+
 	* locale/programs/ld-ctype.c (set_class_defaults): Correctly
 	determine tolower mapping for 8bit table if the tolower keyword is
 	not given.
diff --git a/ctype/Versions b/ctype/Versions
index 6110f848c8..68df144f6d 100644
--- a/ctype/Versions
+++ b/ctype/Versions
@@ -11,4 +11,8 @@ libc {
     # t*
     toascii; tolower; toupper;
   }
+  GLIBC_2.2 {
+    # global variables
+    __ctype32_tolower; __ctype32_toupper;
+  }
 }
diff --git a/ctype/ctype-info.c b/ctype/ctype-info.c
index 30b1cce6ff..898ad06e72 100644
--- a/ctype/ctype-info.c
+++ b/ctype/ctype-info.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991, 1992, 1995, 1996, 1997 Free Software Foundation, Inc.
+/* Copyright (C) 1991, 92, 95, 96, 97, 99 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -24,6 +24,8 @@ extern const char _nl_C_LC_CTYPE_class[];
 extern const char _nl_C_LC_CTYPE_class32[];
 extern const char _nl_C_LC_CTYPE_toupper[];
 extern const char _nl_C_LC_CTYPE_tolower[];
+extern const char _nl_C_LC_CTYPE_toupper32[];
+extern const char _nl_C_LC_CTYPE_tolower32[];
 extern const char _nl_C_LC_CTYPE_names[];
 extern const char _nl_C_LC_CTYPE_width[];
 
@@ -33,5 +35,7 @@ const unsigned short int *__ctype_b = b (unsigned short int, class, 128);
 const __uint32_t *__ctype32_b = b (__uint32_t, class32, 0);
 const __int32_t *__ctype_tolower = b (__int32_t, tolower, 128);
 const __int32_t *__ctype_toupper = b (__int32_t, toupper, 128);
+const __uint32_t *__ctype32_tolower = b (__int32_t, tolower32, 0);
+const __uint32_t *__ctype32_toupper = b (__int32_t, toupper32, 0);
 const __uint32_t *__ctype_names = b (__uint32_t, names, 0);
 const unsigned char *__ctype_width = b (unsigned char, width, 0);
diff --git a/locale/C-ctype.c b/locale/C-ctype.c
index 3e03f4461a..e7da5d4d95 100644
--- a/locale/C-ctype.c
+++ b/locale/C-ctype.c
@@ -182,7 +182,7 @@ const char _nl_C_LC_CTYPE_class32[1024] =
   /* 0xfc */ "\000\000\002\000" "\000\000\002\000" "\000\000\002\000"
   /* 0xff */ "\000\000\002\000"
 ;
-const u_int32_t _nl_C_LC_CTYPE_toupper[384] =
+const uint32_t _nl_C_LC_CTYPE_toupper[384] =
 {
   /* 0x80 */ 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
   /* 0x88 */ 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
@@ -233,7 +233,7 @@ const u_int32_t _nl_C_LC_CTYPE_toupper[384] =
   /* 0xf0 */ 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
   /* 0xf8 */ 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff
 };
-const u_int32_t _nl_C_LC_CTYPE_tolower[384] =
+const uint32_t _nl_C_LC_CTYPE_tolower[384] =
 {
   /* 0x80 */ 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
   /* 0x88 */ 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
@@ -284,7 +284,77 @@ const u_int32_t _nl_C_LC_CTYPE_tolower[384] =
   /* 0xf0 */ 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
   /* 0xf8 */ 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff
 };
-const u_int32_t _nl_C_LC_CTYPE_names[256] =
+const uint32_t _nl_C_LC_CTYPE_toupper32[256] =
+{
+  /* 0x00 */ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+  /* 0x08 */ 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+  /* 0x10 */ 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+  /* 0x18 */ 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
+  /* 0x20 */ 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
+  /* 0x28 */ 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
+  /* 0x30 */ 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
+  /* 0x38 */ 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
+  /* 0x40 */ 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
+  /* 0x48 */ 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
+  /* 0x50 */ 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
+  /* 0x58 */ 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
+  /* 0x60 */ 0x60, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
+  /* 0x68 */ 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
+  /* 0x70 */ 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
+  /* 0x78 */ 0x58, 0x59, 0x5a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
+  /* 0x80 */ 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
+  /* 0x88 */ 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
+  /* 0x90 */ 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
+  /* 0x98 */ 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
+  /* 0xa0 */ 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
+  /* 0xa8 */ 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
+  /* 0xb0 */ 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7,
+  /* 0xb8 */ 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
+  /* 0xc0 */ 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
+  /* 0xc8 */ 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,
+  /* 0xd0 */ 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
+  /* 0xd8 */ 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
+  /* 0xe0 */ 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
+  /* 0xe8 */ 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
+  /* 0xf0 */ 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
+  /* 0xf8 */ 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff
+};
+const uint32_t _nl_C_LC_CTYPE_tolower32[256] =
+{
+  /* 0x00 */ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+  /* 0x08 */ 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+  /* 0x10 */ 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+  /* 0x18 */ 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
+  /* 0x20 */ 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
+  /* 0x28 */ 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
+  /* 0x30 */ 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
+  /* 0x38 */ 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
+  /* 0x40 */ 0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
+  /* 0x48 */ 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
+  /* 0x50 */ 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
+  /* 0x58 */ 0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
+  /* 0x60 */ 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
+  /* 0x68 */ 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
+  /* 0x70 */ 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
+  /* 0x78 */ 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
+  /* 0x80 */ 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
+  /* 0x88 */ 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
+  /* 0x90 */ 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
+  /* 0x98 */ 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
+  /* 0xa0 */ 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
+  /* 0xa8 */ 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
+  /* 0xb0 */ 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7,
+  /* 0xb8 */ 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
+  /* 0xc0 */ 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
+  /* 0xc8 */ 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,
+  /* 0xd0 */ 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
+  /* 0xd8 */ 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
+  /* 0xe0 */ 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
+  /* 0xe8 */ 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
+  /* 0xf0 */ 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
+  /* 0xf8 */ 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff
+};
+const uint32_t _nl_C_LC_CTYPE_names[256] =
 {
   /* 0x00 */ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
   /* 0x08 */ 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
@@ -343,7 +413,7 @@ const struct locale_data _nl_C_LC_CTYPE =
   _nl_C_name,
   NULL, 0, 0, /* no file mapped */
   UNDELETABLE,
-  60,
+  62,
   {
     { string: _nl_C_LC_CTYPE_class },
     { string: (const char *) _nl_C_LC_CTYPE_toupper },
@@ -354,16 +424,25 @@ const struct locale_data _nl_C_LC_CTYPE =
     { word: 1 },
     { string: "upper\0" "lower\0" "alpha\0" "digit\0" "xdigit\0" "space\0"
 	      "print\0" "graph\0" "blank\0" "cntrl\0" "punct\0"  "alnum\0"
+#ifdef PREDEFINED_CLASSES
 	      "left_to_right\0" "right_to_left\0" "num_terminator\0"
 	      "num_separator\0" "segment_separator\0" "block_separator\0"
 	      "direction_control\0" "sym_swap_layout\0" "char_shape_selector\0"
 	      "num_shape_selector\0" "non_spacing\0" "non_spacing_level3\0"
 	      "r_connect\0" "no_connect\0" "no_connect-space\0"
-	      "vowel_connect\0" },
-    { string: "tolower\0" "toupper\0" "tosymmetric\0" },
+	      "vowel_connect\0"
+#endif
+    },
+    { string: "tolower\0" "toupper\0"
+#ifdef PREDEFINED_CLASSES
+      "tosymmetric\0"
+#endif
+    },
     { string: _nl_C_LC_CTYPE_width },
     { word: 1 },
     { string: "ANSI_X3.4-1968" },
+    { string: (const char *) _nl_C_LC_CTYPE_toupper32 },
+    { string: (const char *) _nl_C_LC_CTYPE_tolower32 },
     { word: 1 },
     { string: "0" },
     { string: "1" },
diff --git a/locale/langinfo.h b/locale/langinfo.h
index b6090bd0f8..1a8b743a94 100644
--- a/locale/langinfo.h
+++ b/locale/langinfo.h
@@ -271,6 +271,8 @@ enum
 #ifdef __USE_XOPEN
   CODESET = _NL_CTYPE_CODESET_NAME,
 #endif
+  _NL_CTYPE_TOUPPER32,
+  _NL_CTYPE_TOLOWER32,
   _NL_CTYPE_INDIGITS_MB_LEN,
   _NL_CTYPE_INDIGITS0_MB,
   _NL_CTYPE_INDIGITS1_MB,
diff --git a/locale/lc-ctype.c b/locale/lc-ctype.c
index e3cb2f6741..1a35e245cb 100644
--- a/locale/lc-ctype.c
+++ b/locale/lc-ctype.c
@@ -43,11 +43,15 @@ _nl_postload_ctype (void)
   extern const uint32_t *__ctype32_b;
   extern const uint32_t *__ctype_names;
   extern const unsigned char *__ctype_width;
+  extern const uint32_t *__ctype32_toupper;
+  extern const uint32_t *__ctype32_tolower;
 
   __ctype_b = current (uint16_t, CLASS, 128);
   __ctype_toupper = current (uint32_t, TOUPPER, 128);
   __ctype_tolower = current (uint32_t, TOLOWER, 128);
   __ctype32_b = current (uint32_t, CLASS32, 0);
+  __ctype32_toupper = current (uint32_t, TOUPPER32, 0);
+  __ctype32_tolower = current (uint32_t, TOLOWER32, 0);
   __ctype_names = current (uint32_t, NAMES, 0);
   __ctype_width = current (unsigned char, WIDTH, 0);
 }
diff --git a/locale/programs/ld-ctype.c b/locale/programs/ld-ctype.c
index a379b23ab9..1b8775efeb 100644
--- a/locale/programs/ld-ctype.c
+++ b/locale/programs/ld-ctype.c
@@ -146,6 +146,7 @@ struct locale_ctype_t
   char_class32_t *ctype32_b;
   uint32_t *names;
   uint32_t **map;
+  uint32_t **map32;
   uint32_t *class_name_ptr;
   uint32_t *map_name_ptr;
   unsigned char *width;
@@ -793,6 +794,15 @@ ctype_output (struct localedef_t *locale, struct charmap_t *charmap,
 		      (ctype->plane_size * ctype->plane_cnt + 128)
 		      * sizeof (uint32_t));
 
+	  CTYPE_DATA (_NL_CTYPE_TOUPPER32,
+		      ctype->map32[0],
+		      (ctype->plane_size * ctype->plane_cnt + 128)
+		      * sizeof (uint32_t));
+	  CTYPE_DATA (_NL_CTYPE_TOLOWER32,
+		      ctype->map32[1],
+		      (ctype->plane_size * ctype->plane_cnt + 128)
+		      * sizeof (uint32_t));
+
 	  CTYPE_DATA (_NL_CTYPE_CLASS32,
 		      ctype->ctype32_b,
 		      (ctype->plane_size * ctype->plane_cnt
@@ -969,7 +979,7 @@ ctype_output (struct localedef_t *locale, struct charmap_t *charmap,
 	  /* Handle extra maps.  */
 	  size_t nr = (elem - _NL_ITEM_INDEX (_NL_NUM_LC_CTYPE)) + 2;
 
-	  iov[2 + elem + offset].iov_base = ctype->map[nr];
+	  iov[2 + elem + offset].iov_base = ctype->map32[nr];
 	  iov[2 + elem + offset].iov_len = ((ctype->plane_size
 					     * ctype->plane_cnt + 128)
 					    * sizeof (uint32_t));
@@ -3019,22 +3029,17 @@ Computing table size for character classes might take a while..."),
     ctype->ctype32_b[ctype->charnames[idx]] = ctype->class_collection[idx];
 
   /* Room for table of mappings.  */
-  ctype->map = (uint32_t **) xmalloc (ctype->map_collection_nr
+  ctype->map = (uint32_t **) xmalloc (2 * sizeof (uint32_t *));
+  ctype->map32 = (uint32_t **) xmalloc (ctype->map_collection_nr
 				      * sizeof (uint32_t *));
 
   /* Fill in all mappings.  */
-  for (idx = 0; idx < ctype->map_collection_nr; ++idx)
+  for (idx = 0; idx < 2; ++idx)
     {
       unsigned int idx2;
 
       /* Allocate table.  */
-      ctype->map[idx] = (uint32_t *) xmalloc ((ctype->plane_size
-					       * ctype->plane_cnt + 128)
-					      * sizeof (uint32_t));
-
-      /* Copy default value (identity mapping).  */
-      memcpy (&ctype->map[idx][128], ctype->names,
-	      ctype->plane_size * ctype->plane_cnt * sizeof (uint32_t));
+      ctype->map[idx] = (uint32_t *) xmalloc ((256 + 128) * sizeof (uint32_t));
 
       /* Copy values from collection.  */
       for (idx2 = 0; idx2 < 256; ++idx2)
@@ -3047,12 +3052,25 @@ Computing table size for character classes might take a while..."),
 
       /* EOF must map to EOF.  */
       ctype->map[idx][127] = EOF;
+    }
 
-      /* The 32 bit map collection.  */
-      for (idx2 = 0; idx2 < ctype->map_collection_act[idx]; ++idx2)
+  for (idx = 0; idx < ctype->map_collection_nr; ++idx)
+    {
+      unsigned int idx2;
+
+      /* Allocate table.  */
+      ctype->map[idx] = (uint32_t *) xmalloc (ctype->plane_size
+					      * ctype->plane_cnt
+					      * sizeof (uint32_t));
+
+      /* Copy default value (identity mapping).  */
+      memcpy (ctype->map[idx], ctype->names,
+	      ctype->plane_size * ctype->plane_cnt * sizeof (uint32_t));
+
+      /* Copy values from collection.  */
+      for (idx2 = 0; idx2 < 256; ++idx2)
 	if (ctype->map_collection[idx][idx2] != 0)
-	  ctype->map[idx][128 + ctype->charnames[idx2]]
-	    = ctype->map_collection[idx][idx2];
+	  ctype->map[idx][idx2] = ctype->map_collection[idx][idx2];
     }
 
   /* Extra array for class and map names.  */
diff --git a/wctype/wcfuncs.c b/wctype/wcfuncs.c
index 30836edb9b..2f60c4a650 100644
--- a/wctype/wcfuncs.c
+++ b/wctype/wcfuncs.c
@@ -25,6 +25,8 @@
 /* If the program is compiled without optimization the following declaration
    is not visible in the header.   */
 extern unsigned int *__ctype32_b;
+extern const uint32_t *__ctype32_toupper;
+extern const uint32_t *__ctype32_tolower;
 
 /* Provide real-function versions of all the wctype macros.  */
 
@@ -76,7 +78,7 @@ wint_t
     /* Character is not known.  Default action is to simply return it.  */
     return wc;
 
-  return (wint_t) __ctype_tolower[idx];
+  return (wint_t) __ctype32_tolower[idx];
 }
 
 wint_t
@@ -90,5 +92,5 @@ wint_t
     /* Character is not known.  Default action is to simply return it.  */
     return wc;
 
-  return (wint_t) __ctype_toupper[idx];
+  return (wint_t) __ctype32_toupper[idx];
 }
diff --git a/wctype/wctype.h b/wctype/wctype.h
index 378095bcb4..2a4caddd90 100644
--- a/wctype/wctype.h
+++ b/wctype/wctype.h
@@ -238,6 +238,22 @@ extern wint_t towupper (wint_t __wc) __THROW;
 /* Map the wide character WC using the mapping described by DESC.  */
 extern wint_t __towctrans (wint_t __wc, wctrans_t __desc) __THROW;
 
+#if __GNUC__ >= 2 && defined __OPTIMIZE__
+/* The tables are always organized in a way which allows direct access
+   for single byte characters.  */
+extern const wint_t *__ctype32_tolower;
+extern const wint_t *__ctype32_toupper;
+
+# define towlower(wc) \
+  (__builtin_constant_p (wc) && (wc) >= L'\0' && (wc) <= L'\xff'	      \
+   ? (wint_t) __ctype32_tolower[wc] : towlower (wc))
+
+# define towupper(wc) \
+  (__builtin_constant_p (wc) && (wc) >= L'\0' && (wc) <= L'\xff'	      \
+   ? (wint_t) __ctype32_toupper[wc] : towupper (wc))
+
+#endif	/* gcc && optimizing */
+
 __END_DECLS
 
 #endif	/* need iswxxx.  */