[Bug middle-end/102162] Byte-wise access optimized away at -O1 and above

[deller at gmx dot de via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102162

--- Comment #31 from deller at gmx dot de ---
Richard suggested that adding a compiler optimization barrier (__asm__ ("" :
"+r" (__pptr))) might fix the problem.
I tested the attached patch and it works nicely.