https://gcc.gnu.org/g:82749a9eee42956cced9e1c643ccc739606d1fd3
commit 82749a9eee42956cced9e1c643ccc739606d1fd3
Author: Michael Meissner <meiss...@linux.ibm.com>
Date: Tue Jul 22 00:10:30 2025 -0400
Update ChangeLog.*
Diff:
---
gcc/ChangeLog.bugs | 44 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 44 insertions(+)
diff --git a/gcc/ChangeLog.bugs b/gcc/ChangeLog.bugs
index cb92c6bc2168..468610cdefc6 100644
--- a/gcc/ChangeLog.bugs
+++ b/gcc/ChangeLog.bugs
@@ -1,3 +1,47 @@
+==================== Branch work215-bugs, patch #100 ====================
+
+PR 99293: Optimize splat of a V2DF/V2DI extract with constant element
+
+We had optimizations for splat of a vector extract for the other vector
+types, but we missed having one for V2DI and V2DF. This patch adds a
+combiner insn to do this optimization.
+
+In looking at the source, we had similar optimizations for V4SI and V4SF
+extract and splats, but we missed doing V2DI/V2DF.
+
+Without the patch for the code:
+
+ vector long long splat_dup_l_0 (vector long long v)
+ {
+ return __builtin_vec_splats (__builtin_vec_extract (v, 0));
+ }
+
+the compiler generates (on a little endian power9):
+
+ splat_dup_l_0:
+ mfvsrld 9,34
+ mtvsrdd 34,9,9
+ blr
+
+Now it generates:
+
+ splat_dup_l_0:
+ xxpermdi 34,34,34,3
+ blr
+
+2025-07-22 Michael Meissner <meiss...@linux.ibm.com>
+
+gcc/
+
+ PR target/99293
+ * config/rs6000/vsx.md (vsx_splat_extract_<mode>): New insn.
+
+gcc/testsuite/
+
+ PR target/99293
+ * gcc.target/powerpc/builtins-1.c: Adjust insn count.
+ * gcc.target/powerpc/pr99293.c: New test.
+
==================== Branch work215-bugs, baseline ====================
2025-07-15 Michael Meissner <meiss...@linux.ibm.com>
