On Tue, 9 Oct 2018, Richard Biener wrote: > > then we cannot set the alignment of i_1 at/after k = *i_1 because doing so > would > affect the alignment test which we'd then optimize away. We'd need to > introduce > a SSA copy to get a new SSA name but that would be optimized away quickly.
We preserve __builtin_assume_aligned up to pass-fold-all-builtins, so would it work to emit it just before the memcpy i_2 = __builtin_assume_aligned(i_1, 4); __builtin_memcpy(j, i_2, 32); in theory? Alexander
