On 21/03/2016 10:35, Peter Maydell wrote: > > x86 can actually do 64-bit atomic loads and stores through the FPU, but > > I'm not sure about other 32-bit targets? > > As I say, ppc32 linux is one that can't -- see commit 8a5956ad6392f1155 > for last time this came up.
Yes, I remember that. Loads and stores are different from RMW operations, though. > Ideally we should put a compile-time assert in the atomic ops that > the data being operated on isn't larger than sizeof(void*) so that > this is a compile time error on all 32-bit hosts rather than just > a small subset of them. Yes, I will do it if Alex doesn't beat me to it. Paolo
