[Bug rtl-optimization/38534] gcc 4.2.1 and above: No need to save called-saved registers in 'noreturn' function

[lukas.graetz--- via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=38534

--- Comment #13 from Lukas Grätz <lukas.gra...@tu-darmstadt.de> ---
(In reply to Lukas Grätz from comment #12)

>   CODE, uses loop unwinding functions
>        a) restores all callee-saved registers in f3(), f2()
>        b) restores %rsp and %rip from stack of f2()

I meant stack unwinding.  f3() and f2() can be in separate compilation units,
it needs is ".cfi_offset REGISTER, OFFSET" from the elf (also in the generated
assembly).