[Bug middle-end/67714] [6 Regression] signed char is zero-extended instead of sign-extended

[kugan at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67714

--- Comment #2 from kugan at gcc dot gnu.org ---
It is the same issue and the patch posted in
https://gcc.gnu.org/ml/gcc-patches/2015-09/msg00403.html fixes this test-case
too.