https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106635
--- Comment #9 from Xiaoguang <xgchenshy at 126 dot com> --- (In reply to Andrew Pinski from comment #8) > In ARM Armv8, for A-profile architecture (ARM DDI 0487G.b (ID072021)): > > From section B2.5.2 Alignment of data accesses: > > An unaligned access to any type of Device memory causes an Alignment fault. > > Unaligned accesses to Normal memory Yeah, I also find such description, my memory type is uncachable normal memory, but not device memory I use mmap to get the virtual address with an O_SYNC in fd
