> Steven Bosscher wrote: > > Hi rth, > > > > The stack space sharing you added to cfgexpand.c breaks RTL alias > > analysis. > > > > For example, the attached test case breaks for pentiumpro at -O2. > > The problem apparently is that the second store to c is moved up > > before before the load. > > My guess at a solution is that when A (with alias set S_a) and B (with > alias set S_b) are given the same stack slot, we should create a new > alias set S_c which is a subset of both S_a and S_b, and give the > combined stack slot that aliase set.
This won't work for the indirect accesses via pointers, like in the testcase. Honza > > -- > Mark Mitchell > CodeSourcery, LLC > [EMAIL PROTECTED] > (650) 331-3385 x713
