Le mardi 07 décembre 2010 à 06:18 -0700, Jeff Law a écrit : > On 12/06/10 15:07, Ian Lance Taylor wrote: > Given the two loads don't have a def-use data dependency combine won't > ever get the opportunity to do anything with them. In general there is > no pass which combines insns without a true data dependency and targets > which have such insns have had to handle those combinations in machine > dependent reorg. In fact, it was the combination of independent insns > which led to the introduction of the machine dependent reorg pass eons ago.
The issue with this approach is that reorg runs very late. I suppose that if one wants to combine 2 SI loads into a DI load, it needs to be done before IRA to satisfy the generated register constraints. Fred
