[Bug rtl-optimization/114768] Volatile reads can be optimized away

[segher at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114768

--- Comment #6 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Heh, crossed :-)  I can confirm my patch works (tested and everything).  I have
no idea about zero_extract, which is a blight that should be eradicated tooth
and
nail!