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path: root/lib/CodeGen/RegAllocLinearScan.cpp
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2008-08-13Get rid of a use of std::map.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54770 91177308-0d34-0410-b5e6-96231b3b80d8
2008-08-13Make the allocation of LiveIntervals explicit, rather than holding them in ↵Owen Anderson
the r2iMap_ by value. This will prevent references to them from being invalidated if the map is changed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54763 91177308-0d34-0410-b5e6-96231b3b80d8
2008-07-23Fix a compile-time regression introduced by my heuristic-changing patch. I ↵Owen Anderson
forgot to multiply the instruction count by a constant factor in a few places, which caused the register allocator to require many more iterations. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53959 91177308-0d34-0410-b5e6-96231b3b80d8
2008-07-22Change the heuristics used in the coalescer, register allocator, and withinOwen Anderson
live intervals itself to use an instruction count approximation that is not affected by inserting empty indices. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53937 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-23A brief survey of priority_queue usage in the tree turned this upDan Gohman
as a questionable case, but the code isn't actually needed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52657 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-20Enhanced heuristic to determine the *best* register to spill. Instead of ↵Evan Cheng
picking the register with the lowest spill weight. Consider (up to) 2 additional registers with spill weights that are close to the lowest spill weight. The one with fewest defs and uses that conflicts with the current interval (weighted by loop depth) is the spill candidate. This is not always a win, but there are much more wins than loses and wins tend to be more noticeable. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52554 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-06Refine stack slot interval weight computation.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52040 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-04Add a stack slot coloring pass. Not yet enabled.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51934 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-11Do not add empty live intervals to handled_. They should never be undone for ↵Evan Cheng
backtracking. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49544 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-03Special handling of zero-sized live intervals.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49167 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-24Add an assertion to catch register of illegal class.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48751 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-13Undo tweak. It had no obvious benefit.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48341 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-11When the register allocator runs out of registers, spill a physical register ↵Evan Cheng
around the def's and use's of the interval being allocated to make it possible for the interval to target a register and spill it right away and restore a register for uses. This likely generates terrible code but is before than aborting. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48218 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-11Temporarily revert 48175.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48204 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-10If the register allocator ran out of registers, just abort for now.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48175 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-26Use a smallvector for inactiveCounts and initialize it lazily Chris Lattner
instead of init'ing it maximally to zeros on entry. getFreePhysReg is pretty hot and only a few elements are typically used. This speeds up linscan by 5% on 176.gcc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47631 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-26Rename PrintableName to Name.Bill Wendling
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47629 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-26Change "Name" to "AsmName" in the target register info. Gee, a refactoring toolBill Wendling
would have been a Godsend here! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47625 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-20Fix newly-introduced 4.3 warningsAnton Korobeynikov
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47375 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-10Rename MRegisterInfo to TargetRegisterInfo.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46930 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-04Don't recalculate the loop info and loop dominators analyses if they'reBill Wendling
preserved. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45596 91177308-0d34-0410-b5e6-96231b3b80d8
2007-12-31Rename SSARegMap -> MachineRegisterInfo in keeping with the idea Chris Lattner
that "machine" classes are used to represent the current state of the code being compiled. Given this expanded name, we can start moving other stuff into it. For now, move the UsedPhysRegs and LiveIn/LoveOuts vectors from MachineFunction into it. Update all the clients to match. This also reduces some needless #includes, such as MachineModuleInfo from MachineFunction. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45467 91177308-0d34-0410-b5e6-96231b3b80d8
2007-12-29Remove attribution from file headers, per discussion on llvmdev.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45418 91177308-0d34-0410-b5e6-96231b3b80d8
2007-12-11Switch over to MachineLoopInfo.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44838 91177308-0d34-0410-b5e6-96231b3b80d8
2007-11-17Live interval splitting:Evan Cheng
When a live interval is being spilled, rather than creating short, non-spillable intervals for every def / use, split the interval at BB boundaries. That is, for every BB where the live interval is defined or used, create a new interval that covers all the defs and uses in the BB. This is designed to eliminate one common problem: multiple reloads of the same value in a single basic block. Note, it does *not* decrease the number of spills since no copies are inserted so the split intervals are *connected* through spill and reloads (or rematerialization). The newly created intervals can be spilled again, in that case, since it does not span multiple basic blocks, it's spilled in the usual manner. However, it can reuse the same stack slot as the previously split interval. This is currently controlled by -split-intervals-at-bb. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44198 91177308-0d34-0410-b5e6-96231b3b80d8
2007-11-15Adding debug output during coalescing.Bill Wendling
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44154 91177308-0d34-0410-b5e6-96231b3b80d8
2007-11-15Need to increment the iterator.Bill Wendling
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44153 91177308-0d34-0410-b5e6-96231b3b80d8
2007-11-12Refactor some code.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44010 91177308-0d34-0410-b5e6-96231b3b80d8
2007-11-04If an interval is being undone clear its preference as well since the source ↵Evan Cheng
interval may have been undone as well. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43670 91177308-0d34-0410-b5e6-96231b3b80d8
2007-11-03There are times when the coalescer would not coalesce away a copy but the copyEvan Cheng
can be eliminated by the allocator is the destination and source targets the same register. The most common case is when the source and destination registers are in different class. For example, on x86 mov32to32_ targets GR32_ which contains a subset of the registers in GR32. The allocator can do 2 things: 1. Set the preferred allocation for the destination of a copy to that of its source. 2. After allocation is done, change the allocation of a copy destination (if legal) so the copy can be eliminated. This eliminates 443 extra moves from 403.gcc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43662 91177308-0d34-0410-b5e6-96231b3b80d8
2007-10-17Apply Chris' suggestions.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43069 91177308-0d34-0410-b5e6-96231b3b80d8
2007-10-17Clean up code that calculate MBB live-in's.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43061 91177308-0d34-0410-b5e6-96231b3b80d8
2007-10-16Some clean up.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43043 91177308-0d34-0410-b5e6-96231b3b80d8
2007-10-12Some clean up.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42898 91177308-0d34-0410-b5e6-96231b3b80d8
2007-09-06Pluggable coalescers inplementation.David Greene
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41743 91177308-0d34-0410-b5e6-96231b3b80d8
2007-08-13Re-implement trivial rematerialization. This allows def MIs whose live ↵Evan Cheng
intervals that are coalesced to be rematerialized. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41060 91177308-0d34-0410-b5e6-96231b3b80d8
2007-06-08Factor live variable analysis so it does not do register coalescingDavid Greene
simultaneously. Move that pass to SimpleRegisterCoalescing. This makes it easier to implement alternative register allocation and coalescing strategies while maintaining reuse of the existing live interval analysis. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37520 91177308-0d34-0410-b5e6-96231b3b80d8
2007-05-08Change names from RA to something unique to get rid of naming conflicts withBill Wendling
certain linkers... git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36944 91177308-0d34-0410-b5e6-96231b3b80d8
2007-05-03Drop 'const'Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36662 91177308-0d34-0410-b5e6-96231b3b80d8
2007-05-02Use 'static const char' instead of 'static const int'.Devang Patel
Due to darwin gcc bug, one version of darwin linker coalesces static const int, which defauts PassID based pass identification. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36652 91177308-0d34-0410-b5e6-96231b3b80d8
2007-05-01Do not use typeinfo to identify pass in pass manager.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36632 91177308-0d34-0410-b5e6-96231b3b80d8
2007-04-25Match MachineFunction::UsedPhysRegs changes.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36452 91177308-0d34-0410-b5e6-96231b3b80d8
2007-04-25Clean up.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36431 91177308-0d34-0410-b5e6-96231b3b80d8
2007-04-17Copy coalescing change to prevent a physical register from being pin to aEvan Cheng
long live interval that has low usage density. 1. Change order of coalescing to join physical registers with virtual registers first before virtual register intervals become too long. 2. Check size and usage density to determine if it's worthwhile to join. 3. If joining is aborted, assign virtual register live interval allocation preference field to the physical register. 4. Register allocator should try to allocate to the preferred register first (if available) to create identify moves that can be eliminated. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36218 91177308-0d34-0410-b5e6-96231b3b80d8
2007-03-20First cut trivial re-materialization support.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35208 91177308-0d34-0410-b5e6-96231b3b80d8
2007-02-25Only add liveinterval to livein set if it isn't assigned a stack slot.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34593 91177308-0d34-0410-b5e6-96231b3b80d8
2007-02-19Re-apply my liveintervalanalysis changes. Now with PR1207 fixes.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34428 91177308-0d34-0410-b5e6-96231b3b80d8
2007-02-19For PR1207:Reid Spencer
Revert patches that caused the problem. Evan, please investigate and reapply when you've discovered the problem. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34399 91177308-0d34-0410-b5e6-96231b3b80d8
2007-02-17Do not add livein's to entry MBB twice.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34382 91177308-0d34-0410-b5e6-96231b3b80d8
2007-02-16Add live-ins to every BB.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34342 91177308-0d34-0410-b5e6-96231b3b80d8
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