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...the new greedy allocator. Linear scan can be enabled by passing '-regalloc=linearscan -join-physregs' to llc. RegAllocLinearScan and VirtRegRewriter need to go away soon because they are blocking some code cleanup efforts in the register allocation framework. I will also be removing the StandardSpiller class from Spiller.cpp as well as the code it depends on in LiveIntervalAnalysis. - Linear scan is using the deferred spill code insertion that StandardSpiller and VirtRegRewriter provides. This was originally designed to cope with a static instruction numbering, but today's dynamic SlotIn...

...uot; register allocator (just like can be done with the "local" allocator)? I still haven't grokked very well the interaction between RALinScan and Spiller... Should I add those two statistics to the spiller's class? RALinearScan asks the Spiller to spill a virtual register. The StandardSpiller passes the request to LiveIntervals::addIntervalsForSpills. Here, the spill and restore points are added to the VirtRegMap. No spill code has been inserted yet. After register allocation completes, VirtRegRewriter inserts the store and load instructions specified in VirtRegMap. The counters yo...

Hi, Is there a way for me to collect statistics about the number of loads/stores added by the "linearscan" register allocator (just like can be done with the "local" allocator)? I still haven't grokked very well the interaction between RALinScan and Spiller... Should I add those two statistics to the spiller's class? Thanks, -- Silvio Ricardo Cordeiro --------------

...like can be > done with the "local" allocator)? I still haven't grokked very well the > interaction between RALinScan and Spiller... Should I add those two > statistics to the spiller's class? > > RALinearScan asks the Spiller to spill a virtual register. The > StandardSpiller passes the request to LiveIntervals::addIntervalsForSpills. > Here, the spill and restore points are added to the VirtRegMap. No spill > code has been inserted yet. After register allocation completes, > VirtRegRewriter inserts the store and load instructions specified in > VirtRegMa...