[gcc(refs/users/meissner/heads/work247-float)] Update ChangeLog.*

[Michael Meissner]

https://gcc.gnu.org/g:68d98f521b57588e586dfa6321d25307669eeaeb

commit 68d98f521b57588e586dfa6321d25307669eeaeb
Author: Michael Meissner <meissner@linux.ibm.com>
Date:   Fri Jun 19 19:36:52 2026 -0400

    Update ChangeLog.*

Diff:
---
 gcc/ChangeLog.float | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/gcc/ChangeLog.float b/gcc/ChangeLog.float
index b69aa8b018aa..741cdbbcb8da 100644
--- a/gcc/ChangeLog.float
+++ b/gcc/ChangeLog.float
@@ -1,3 +1,21 @@
+==================== Branch work247-float, patch #231 ====================
+
+Optimization convertion between __bfloat16 and _Float16.
+
+2026-06-19  Michael Meissner  <meissner@linux.ibm.com>
+
+gcc/
+
+	* config/rs6000/float16.md (cvt_fp16_to_v4sf): Rename from
+	cvt_fp16_to_v4sf_insn.
+	(cvt_v4sf_to_fp16): New mode attribute.
+	(UNSPEC_CVT_V4SF_TO_FP16): New unspec.
+	(trunchfbf2): Rework to do the conversion from vector to vector, and not
+	converting to double as an intermediate.  Move ode down in float16.md.
+	(extendbfhf2): Likewise.
+	(trunchfbf2_mem): New insn to optimization load and conversion.
+	(extendbfhf2_mem): Likewise.
+
 ==================== Branch work247-float, patch #230 ====================
 
 Add _Float16 and __bfloat16 tests.