[gcc(refs/users/meissner/heads/work097)] Update ChangeLog.meissner.

[Michael Meissner <meissner@gcc.gnu.org>]

https://gcc.gnu.org/g:50d44e73584dc2dd98caa649903c8aefa3b6990e

commit 50d44e73584dc2dd98caa649903c8aefa3b6990e
Author: Michael Meissner <meissner@linux.ibm.com>
Date:   Tue Aug 9 17:06:21 2022 -0400

    Update ChangeLog.meissner.
    
    2022-08-08   Michael Meissner  <meissner@linux.ibm.com>
    
    gcc/
    
            * ChangeLog.meissner: Update.

Diff:
---
 gcc/ChangeLog.meissner | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/gcc/ChangeLog.meissner b/gcc/ChangeLog.meissner
index c6f47016765..4bc6bdb00a9 100644
--- a/gcc/ChangeLog.meissner
+++ b/gcc/ChangeLog.meissner
@@ -1,3 +1,34 @@
+==================== work097, patch002
+
+Rework 128-bit complex multiply and divide.
+
+This function reworks how the complex multiply and divide built-in functions are
+done.  Previously we created built-in declarations for doing long double complex
+multiply and divide when long double is IEEE 128-bit.  The old code also did not
+support __ibm128 complex multiply and divide if long double is IEEE 128-bit.
+
+One of the problems with this approach is that the add_builtin_function would
+abort if we used the same name for two different built-in functions.
+
+This code does not create the built-in declaration.  Instead, it uses the
+TARGET_MANGLE_DECL_ASSEMBLER_NAME hook to change the name before it is written
+out to the assembler file.
+
+2022-08-09   Michael Meissner  <meissner@linux.ibm.com>
+
+gcc/
+
+	* config/rs6000/rs6000-c.cc (rs6000_cpu_cpp_builtins): Set
+	building_libgcc.
+	* config/rs6000/rs6000.cc (create_complex_muldiv): Delete.
+	(init_float128_ieee): Delete code to switch complex multiply and divide
+	for long double.
+	(complex_multiply_builtin_code): New helper function.
+	(complex_divide_builtin_code): Likewise.
+	(rs6000_mangle_decl_assembler_name): Add support for mangling the name
+	of complex 128-bit multiply and divide built-in functions.
+	* config/rs6000/rs6000.opt (building_libgcc): New target variable.
+
 ==================== work097, patch001
 
 Allow __ibm128 even if IEEE 128-bit floating point is not supported.