What alignment can we rely on for function pointers? Most architectures seem to have settled on 4-byte aligned instructions. While x86 is only byte-aligned, at least x86-64 aligns functions on a 16-byte boundary. I know s390 has 2-byte alignment on instructions, but does it have greater alignment on functions? The three architectures with function descriptors (parisc, ia64, ppc64) all seem like they'll be 8-byte aligned. (I'm looking to steal the bottom two bits of a function pointer, so that's where my interest comes from).
