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From: Michael Meissner <meissner@gcc.gnu.org>
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Subject: [gcc(refs/users/meissner/heads/work097)] Make __float128 use the
 _Float128 type.
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https://gcc.gnu.org/g:5781bb7754809e81cbb661c891b28c6d2a1f1432

commit 5781bb7754809e81cbb661c891b28c6d2a1f1432
Author: Michael Meissner <meissner@linux.ibm.com>
Date:   Thu Aug 11 21:11:26 2022 -0400

    Make __float128 use the _Float128 type.
    
    2022-08-11   Michael Meissner  <meissner@linux.ibm.com>
    
    gcc/
    
            * config/rs6000/rs6000-builtin.cc (rs6000_init_builtins): Always use the
            _Float128 type for __float128.  Don't use the long double type.

Diff:
---
 gcc/config/rs6000/rs6000-builtin.cc | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/gcc/config/rs6000/rs6000-builtin.cc b/gcc/config/rs6000/rs6000-builtin.cc
index e34a8f0cebf..1cc97fa49b3 100644
--- a/gcc/config/rs6000/rs6000-builtin.cc
+++ b/gcc/config/rs6000/rs6000-builtin.cc
@@ -733,10 +733,10 @@ rs6000_init_builtins (void)
 
   if (TARGET_FLOAT128_TYPE)
     {
-      if (TARGET_IEEEQUAD && TARGET_LONG_DOUBLE_128)
-	ieee128_float_type_node = long_double_type_node;
-      else
-	ieee128_float_type_node = float128_type_node;
+      /* Always make the type used by __float128 to be the same as the
+	 _Float128 type.  The C23 standard will want long double to be a
+	 different type than _Float128, so don't use the long double type.  */
+      ieee128_float_type_node = float128_type_node;
       t = build_qualified_type (ieee128_float_type_node, TYPE_QUAL_CONST);
       lang_hooks.types.register_builtin_type (ieee128_float_type_node,
 					      "__ieee128");