diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 452ac809046..a0a709dd30d 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2026-04-19  Richard Sandiford  <rdsandiford@googlemail.com>
+
+	PR rtl-optimization/124643
+	* cse.cc (canon_reg): Handle and canonicalize subregs.
+
 2026-04-18  Richard Sandiford  <rdsandiford@googlemail.com>
 
 	* config/aarch64/aarch64.md (SME_STATE_REGNUM): Fix a comment typo.
diff --git a/gcc/DATESTAMP b/gcc/DATESTAMP
index ed84f08a6b1..64476cb7c41 100644
--- a/gcc/DATESTAMP
+++ b/gcc/DATESTAMP
@@ -1 +1 @@
-20260419
+20260420
diff --git a/gcc/ada/ChangeLog b/gcc/ada/ChangeLog
index 693ff0b767e..f64ec5d1755 100644
--- a/gcc/ada/ChangeLog
+++ b/gcc/ada/ChangeLog
@@ -1,3 +1,16 @@
+2026-04-19  Eric Botcazou  <ebotcazou@adacore.com>
+
+	PR ada/124918
+	* gcc-interface/Makefile.in (TGT_LIB): Move up.
+	(LIBBACKTRACE): Likewise.
+	(LIBIBERTY): Likewise.
+	(LIBGNAT): Likewise.
+	(LIBS): Likewise.
+	(TOOLS_LIBS): Use $(LIBS).
+	(TOOLS1_LIBS): Delete.
+	(../../gnatmake$(exeext)): Do not link with $(TOOLS1_LIBS).
+	(../../gnatlink$(exeext)): Likewise.
+
 2026-04-17  Eric Botcazou  <ebotcazou@adacore.com>
 
 	PR ada/107392
diff --git a/gcc/d/ChangeLog b/gcc/d/ChangeLog
index d8146564af1..686ffcd0c26 100644
--- a/gcc/d/ChangeLog
+++ b/gcc/d/ChangeLog
@@ -1,3 +1,9 @@
+2026-04-19  Iain Buclaw  <ibuclaw@gdcproject.org>
+
+	* d-attribs.cc (d_langhook_gnu_attributes): Add no_split_stack
+	attribute.
+	(d_handle_no_split_stack_attribute): New function.
+
 2026-04-18  Iain Buclaw  <ibuclaw@gdcproject.org>
 
 	PR d/124922
diff --git a/gcc/fortran/ChangeLog b/gcc/fortran/ChangeLog
index 9aeb54ae1f5..895abfe6700 100644
--- a/gcc/fortran/ChangeLog
+++ b/gcc/fortran/ChangeLog
@@ -1,3 +1,9 @@
+2026-04-19  Thomas Koenig  <tkoenig@gcc.gnu.org>
+
+	* invoke.texi (fc-prototypes): Correct spelling for opindex.
+	(fc-prototypes-external): Likewise.
+	* lang.opt.urls: Regenerate.
+
 2026-04-16  Paul Thomas  <pault@gcc.gnu.org>
 
 	PR fortran/120140
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 4276423532e..661f03a9b65 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,12 @@
+2026-04-19  Richard Sandiford  <rdsandiford@googlemail.com>
+
+	PR rtl-optimization/124643
+	* gcc.c-torture/compile/pr124643.c: New test.
+
+2026-04-19  Iain Buclaw  <ibuclaw@gdcproject.org>
+
+	* gdc.dg/attr_no_split_stack.d: New test.
+
 2026-04-18  Iain Buclaw  <ibuclaw@gdcproject.org>
 
 	PR d/124922
diff --git a/libphobos/ChangeLog b/libphobos/ChangeLog
index e2c238d03ed..3afd2df7acd 100644
--- a/libphobos/ChangeLog
+++ b/libphobos/ChangeLog
@@ -1,3 +1,11 @@
+2026-04-19  Iain Buclaw  <ibuclaw@gdcproject.org>
+
+	* libdruntime/gcc/attributes.d (callingConvention): New UDA.
+
+2026-04-19  Iain Buclaw  <ibuclaw@gdcproject.org>
+
+	* libdruntime/gcc/attributes.d (noSplitStack): New UDA.
+
 2026-04-14  Iain Buclaw  <ibuclaw@gdcproject.org>
 
 	* libdruntime/MERGE: Merge upstream druntime e145b91245.