[gcc(refs/users/meissner/heads/work089)] Update ChangeLog.meissner.

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

https://gcc.gnu.org/g:042b1ca5be5218ce792c13a9e8c616f7a0bdc543

commit 042b1ca5be5218ce792c13a9e8c616f7a0bdc543
Author: Michael Meissner <meissner@linux.ibm.com>
Date:   Thu May 12 18:22:29 2022 -0400

    Update ChangeLog.meissner.
    
    2022-05-12   Michael Meissner  <meissner@linux.ibm.com>
    
    gcc/
            * ChangeLog.meissner: Update.

Diff:
---
 gcc/ChangeLog.meissner | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/gcc/ChangeLog.meissner b/gcc/ChangeLog.meissner
index 58c83a45a1c..f4f767e8e14 100644
--- a/gcc/ChangeLog.meissner
+++ b/gcc/ChangeLog.meissner
@@ -1,3 +1,20 @@
+==================== work089 patch #3
+
+Replace UNSPEC with RTL code for extendditi2.
+
+When I submitted my patch on March 12th for extendditi2, Segher wished I
+had removed the use of the UNSPEC for the vextsd2q instruction.  This
+patch rewrites extendditi2_vector to use VEC_SELECT rather than UNSPEC.
+
+
+2022-05ー12   Michael Meissner  <meissner@linux.ibm.com>
+
+gcc/
+	* config/rs6000/vsx.md (UNSPEC_EXTENDDITI2): Delete.
+	(extendditi2_vector): Rewrite to use VEC_SELECT as a
+	define_expand.
+	(extendditi2_vector2): New insn.
+
 ==================== work089 patch #2
 
 Optimize vec_splats of constant vec_extract for V2DI/V2DF, PR target 99293.