[Bug target/83302] i386 stack_probe has side effects

matz at gcc dot gnu.org gcc-bugzilla@gcc.gnu.org
Thu Dec 7 13:34:00 GMT 2017


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83302

--- Comment #3 from Michael Matz <matz at gcc dot gnu.org> ---
In any case, this is not something that GCC could do anything about.  A probe
necessarily has to be a write, and writing to something not belonging to own
stack (or guard page) will always have this problem of seemingly destroying
other data.  The non-atomicness of this particular read-mod-write instruction
doesn't enter the picture.


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