On 02/19/2010 01:07 PM, Paolo Carlini wrote: > On 02/19/2010 12:38 PM, Aldy Hernandez wrote: > >> Since the TM library on ia32 is built with -m486, which doesn't have >> 64-bit atomic operations, should we... >> >> a) Build with -m586 and above. >> b) Have _ITM_transactionId_t be 32-bit quantities. >> c) Come up with some locking solution for archs that don't have >> 64-bit atomic operations. >> > My personal opinion on this is that unless we are 100% sure that > performance are decent anyway (thus 3), or 32-bits are certainly enough > (thus 2), we should not waste time supporting anything older than -m586 > for the transactional memory work. > ... a slightly more sophisticated variant of b) would be using uint64_t for 64-bit targets and uint32_t for 32-bit targets, should make everybody happy.
Paolo.
