[Bug target/89604] Type conversion from signed char to a wider integer generates wrong assembly for ARM,

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89604

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
In C, plain char can either be signed or unsigned; this is unlike int.

Which of signed char or unsigned char has the same range, representation, and
behavior as “plain” char (C90 6.1.2.5, C90 6.2.1.1, C99 and C11 6.2.5, C99 and
C11 6.3.1.1).