On Mon, 2021-02-22 at 01:29 -0800, Andrew Pinski wrote: > On Mon, Feb 22, 2021 at 1:17 AM Michael J. Baars > <mjbaars1977....@cyberfiber.eu> wrote: > > Hi, > > > > I just wrote this little program to demonstrate a possible flaw in both > > malloc and calloc. > > > > If I allocate a the simplest memory region from main(), one out of three > > optimization flags fail. > > If I allocate the same region from a function, three out of three > > optimization flags fail. > > > > Does someone know if this really is a flaw, and if so, is it a gcc or a > > kernel flaw? > > There is no flaw. GCC (kernel, glibc) all assume unaligned accesses > on x86 will not cause an exception.
Is this just an assumption or more like a fact? I agree with you that byte aligned is more or less the same as unaligned. > > Thanks, > Andrew > > > Regards, > > Mischa.
