http://d.puremagic.com/issues/show_bug.cgi?id=9243
[email protected] changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |[email protected] --- Comment #1 from [email protected] 2012-12-29 17:59:58 PST --- (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. - 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. So maybe it's better to use this idea only in debug builds. -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------
