I'm seeing lots of C++ execution tests fail ox x86_64 with today's trunk, similar to (or the same as) those reported here for revision 236373:

https://gcc.gnu.org/ml/gcc-testresults/2016-05/msg01935.html

The following build of revision 236357 looks much better:
https://gcc.gnu.org/ml/gcc-testresults/2016-05/msg01923.html

A small subset of the failures I'm seeing is below:

FAIL: g++.old-deja/g++.eh/vbase1.C  -std=c++14 execution test
FAIL: g++.old-deja/g++.eh/vbase2.C  -std=c++14 execution test
FAIL: g++.old-deja/g++.jason/thunk3.C  -std=c++14 execution test
FAIL: g++.old-deja/g++.robertl/eh990323-5.C  -std=c++14 execution test
FAIL: g++.dg/cpp0x/bad_array_new2.C  -std=c++14 execution test
FAIL: g++.dg/eh/ctor1.C  -std=c++14 execution test
FAIL: g++.dg/eh/delete1.C  -std=c++14 execution test
FAIL: g++.dg/eh/uncaught4.C  -std=c++14 execution test
FAIL: g++.dg/eh/unexpected1.C  -std=c++14 execution test
FAIL: g++.dg/init/ctor1.C  -std=c++14 execution test
FAIL: g++.old-deja/g++.eh/fntry1.C  -std=c++14 execution test
FAIL: g++.dg/cpp0x/initlist90.C  -std=c++14 execution test
FAIL: g++.dg/init/array5.C  -std=c++14 execution test
FAIL: g++.old-deja/g++.eh/spec2.C  -std=c++14 execution test
FAIL: g++.old-deja/g++.eh/spec3.C  -std=c++14 execution test
FAIL: g++.old-deja/g++.other/singleton.C  -std=c++14 execution test
FAIL: g++.old-deja/g++.other/init7.C  -std=c++14 execution test
FAIL: g++.old-deja/g++.robertl/eh990323-1.C  -std=c++14 execution test