http://d.puremagic.com/issues/show_bug.cgi?id=9243
--- Comment #2 from Walter Bright <bugzi...@digitalmars.com> 2012-12-29 18:30:18 PST --- (In reply to comment #1) > (In reply to comment #0) > > but this enhancement has zero cost, so why not? > > Advanced compilers do two things: > - If in a function you have nested scopes that define variables, two > successive > scopes are sometimes allowed to re-use the same stack space inside the same > stack frame. I think this can "shuffle" (change) the position of variables in > the stack frame. Dmd already does this using graph coloring. I guess dmd is advanced? :-) > - I think they sometimes use profile-driven optimization to tell what are the > hottest stack variables used in a stack frame. This information is probably > later used to set the position of the variables in the stack frame to put the > hottest closer, or on the contrary to let them go different CPU cache lines, > to > avoid a slower modify-and-read access patterns. Dmd doesn't do this one, although it could based on the same weighting algorithm used to prioritize register assignments. -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------