On 02/11/16 11:57, bernd.edlinger at hotmail dot de wrote: > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77308 > > --- Comment #52 from Bernd Edlinger <bernd.edlinger at hotmail dot de> --- > (In reply to wilco from comment #51) >> >> Indeed, that's the reason behind the existing check. However it disables all >> profitable bswap cases while still generating unaligned accesses if no bswap >> is needed. So I am looking for a callback that gives the correct answer. It >> would need to check -mno-unaligned-access and the target capabilities (eg. >> if unaligned accesses are supported in hardware but really expensive we want >> to avoid them). > > Yes. I think ARM is becoming a non-strict-alignment platform. > While x86_64 is moving in the opposite direction.
It can never be a non-strict alignment platform while some memory access instructions do not support unaligned accesses. However, it is progressively becoming a less slow unaligned access platform. R.
