[gcc(refs/users/meissner/heads/work139)] Update ChangeLog.meissner

[Michael Meissner]

https://gcc.gnu.org/g:66c36aef032ce8876620f44c6ce23631e9011235

commit 66c36aef032ce8876620f44c6ce23631e9011235
Author: Michael Meissner <meissner@linux.ibm.com>
Date:   Thu Oct 12 00:10:00 2023 -0400

    Update ChangeLog.meissner

Diff:
---
 gcc/ChangeLog.meissner | 45 +--------------------------------------------
 1 file changed, 1 insertion(+), 44 deletions(-)

diff --git a/gcc/ChangeLog.meissner b/gcc/ChangeLog.meissner
index 2f6352e33f00..17fa7658723b 100644
--- a/gcc/ChangeLog.meissner
+++ b/gcc/ChangeLog.meissner
@@ -64,48 +64,7 @@ gcc/testsuite/
 	* gcc.target/powerpc/vector-pair-switch3.c: New test.
 	* gcc.target/powerpc/vector-pair-switch4.c: New test.
 
-==================== Branch work139, patch #2 ====================
-
-PowerPC: Do not depend on an undefined shift
-
-I was building a cross compiler to PowerPC on my x86_86 workstation with the
-latest version of GCC on October 11th.  I could not build the compiler on the
-x86_64 system as it died in building libgcc.  I looked into it, and I
-discovered the compiler was recursing until it ran out of stack space.  If I
-build a native compiler with the same sources on a PowerPC system, it builds
-fine.
-
-I traced this down to a change made around October 10th:
-
-| commit 8f1a70a4fbcc6441c70da60d4ef6db1e5635e18a (HEAD)
-| Author: Jiufu Guo <guojiufu@linux.ibm.com>
-| Date:   Tue Jan 10 20:52:33 2023 +0800
-|
-|   rs6000: build constant via li/lis;rldicl/rldicr
-|
-|   If a constant is possible left/right cleaned on a rotated value from
-|   a negative value of "li/lis".  Then, using "li/lis ; rldicl/rldicr"
-|   to build the constant.
-
-The code was doing a -1 << 64 which is undefined behavior because different
-machines produce different results.  On the x86_64 system, (-1 << 64) produces
--1 while on a PowerPC 64-bit system, (-1 << 64) produces 0.  The x86_64 then
-recurses until the stack runs out of space.
-
-If I apply this patch, the compiler builds fine on both x86_64 as a PowerPC
-crosss compiler and on a native PowerPC system.
-
-2023-10-12  Michael Meissner  <meissner@linux.ibm.com>
-
-gcc/
-
-	PR target/111778
-	* config/rs6000/rs6000.cc (can_be_built_by_li_lis_and_rldicl): Protect
-	code from shifts that are undefined.
-	(can_be_built_by_li_lis_and_rldicr): Likewise.
-	(can_be_built_by_li_and_rldic): Likewise.
-
-==================== Branch work139, patch #1 was reverted ====================
+==================== Branch work139, patch #2 applied to trunk ====================
 
 ==================== Branch work139, baseline ====================
 
@@ -142,8 +101,6 @@ libgcc/
 
 	* ChangeLog.meissner: New file.
 
-==================== Branch work139, baseline ====================
-
 2023-10-11   Michael Meissner  <meissner@linux.ibm.com>
 
 	Clone branch