>   * 3e5760fcb4 ("Update _FloatN header support for C++ in GCC 13")
>   * ba70f69598 ("Fix iseqsig for _FloatN and _FloatNx in C++ with GCC 13")
>   * f66780ba46 ("Fix build with GCC 13 _FloatN, _FloatNx built-in
>     functions")

FWIW, I added these three commits to our 2.36 and got some FP test failures
requiring distinct changes in ulps.

Hardware / software: 
Linux pinacolada 5.19.17-gentoo #1 SMP PREEMPT_DYNAMIC Sun Nov 6 20:29:37 CET 2022 x86_64 Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz GenuineIntel GNU/Linux
gcc (Gentoo 11.3.0 p7) 11.3.0

Failure summary:
FAIL: math/test-double-j0
FAIL: math/test-float-ctan
FAIL: math/test-float-j1
FAIL: math/test-float-y0
FAIL: math/test-float-y1
FAIL: math/test-float32-ctan
FAIL: math/test-float32-j1
FAIL: math/test-float32-y0
FAIL: math/test-float32-y1
FAIL: math/test-float32x-j0
FAIL: math/test-float64-j0

Patch produced by regen-ulps:

diff --git a/sysdeps/i386/i686/fpu/multiarch/libm-test-ulps b/sysdeps/i386/i686/fpu/multiarch/libm-test-ulps
index 284e3fa275..8705a7822c 100644
--- a/sysdeps/i386/i686/fpu/multiarch/libm-test-ulps
+++ b/sysdeps/i386/i686/fpu/multiarch/libm-test-ulps
@@ -1027,7 +1027,7 @@ ldouble: 3
 
 Function: Imaginary part of "ctan_upward":
 double: 2
-float: 1
+float: 2
 float128: 5
 ldouble: 3
 
@@ -1260,13 +1260,13 @@ float128: 2
 ldouble: 8
 
 Function: "j0_downward":
-double: 5
+double: 6
 float: 9
 float128: 9
 ldouble: 6
 
 Function: "j0_towardzero":
-double: 6
+double: 7
 float: 9
 float128: 9
 ldouble: 6
@@ -1285,13 +1285,13 @@ ldouble: 9
 
 Function: "j1_downward":
 double: 5
-float: 6
+float: 8
 float128: 4
 ldouble: 4
 
 Function: "j1_towardzero":
 double: 4
-float: 6
+float: 8
 float128: 4
 ldouble: 4
 
@@ -1617,7 +1617,7 @@ ldouble: 5
 
 Function: "y0_towardzero":
 double: 4
-float: 4
+float: 8
 float128: 3
 ldouble: 8
 
@@ -1641,7 +1641,7 @@ ldouble: 7
 
 Function: "y1_towardzero":
 double: 3
-float: 4
+float: 9
 float128: 6
 ldouble: 5
 


-- 
Andreas K. Hüttel
dilfridge@gentoo.org
Gentoo Linux developer
(council, toolchain, base-system, perl, libreoffice)