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path: root/lib/CodeGen/LiveIntervalAnalysis.cpp
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2004-10-26Reduce usage of MRegisterInfo::getRegClassChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17238 91177308-0d34-0410-b5e6-96231b3b80d8
2004-10-25Patch to support MSVC better, contributed by Morten OfstadChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17215 91177308-0d34-0410-b5e6-96231b3b80d8
2004-10-01When a virtual register is folded into an instruction, keep track of whetherChris Lattner
it was a use, def, or both. This allows us to be less pessimistic in our analysis of them. In practice, this doesn't make a big difference, but it doesn't hurt either. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16632 91177308-0d34-0410-b5e6-96231b3b80d8
2004-10-01Pretty print a bit nicer :)Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16628 91177308-0d34-0410-b5e6-96231b3b80d8
2004-09-30There is no need to call MachineInstr::print directly, just send the MI& to ↵Chris Lattner
an ostream. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16613 91177308-0d34-0410-b5e6-96231b3b80d8
2004-09-30* Wrap some comments to 80 colsChris Lattner
* Add const_iterator stuff * Add a print method, which means that I can now call dump() from the debugger. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16612 91177308-0d34-0410-b5e6-96231b3b80d8
2004-09-09Grow the map on entry so that we don't crash if joinIntervals neverAlkis Evlogimenos
runs (if coalescing is disabled for example). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16259 91177308-0d34-0410-b5e6-96231b3b80d8
2004-09-08Use a DenseMap for mapping reg->reg. This improves the LiveIntervalAlkis Evlogimenos
analysis running time from 2.7869secs to 2.5226secs on 176.gcc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16244 91177308-0d34-0410-b5e6-96231b3b80d8
2004-09-03Order #includes alphabetically, local .h files first.Misha Brukman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16153 91177308-0d34-0410-b5e6-96231b3b80d8
2004-09-03Fixes to make LLVM compile with vc7.1.Alkis Evlogimenos
Patch contributed by Paolo Invernizzi! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16152 91177308-0d34-0410-b5e6-96231b3b80d8
2004-09-01Changes For Bug 352Reid Spencer
Move include/Config and include/Support into include/llvm/Config, include/llvm/ADT and include/llvm/Support. From here on out, all LLVM public header files must be under include/llvm/. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16137 91177308-0d34-0410-b5e6-96231b3b80d8
2004-08-31Minor code clarity changes.Alkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16123 91177308-0d34-0410-b5e6-96231b3b80d8
2004-08-27Only update LiveVariables if it is available. addIntervalsForSpillsAlkis Evlogimenos
runs after the initial run of the live interval analysis. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16075 91177308-0d34-0410-b5e6-96231b3b80d8
2004-08-26Use newly added API in MRegisterInfo.Alkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16060 91177308-0d34-0410-b5e6-96231b3b80d8
2004-08-24Fix a bug in a previous checkin of mine, correctingChris Lattner
Regression.CodeGen.Generic.2004-04-09-SameValueCoalescing.llx and the code size problem. This bug prevented us from doing most register coallesces. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16031 91177308-0d34-0410-b5e6-96231b3b80d8
2004-08-15Reduce usage of MRegisterInfo::getRegClassChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15784 91177308-0d34-0410-b5e6-96231b3b80d8
2004-08-04Clean up whitespace.Alkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15490 91177308-0d34-0410-b5e6-96231b3b80d8
2004-08-04Convert indentation to 2 spaces.Alkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15489 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-25Fix the sense of joinableChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15196 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-25Fix a bug where we incorrectly value numbered the first PHI definition theChris Lattner
same as the PHI use. This is not correct as the PHI use value is different depending on which branch is taken. This fixes espresso with aggressive coallescing, and perhaps others. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15189 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-25Add debugging output for joining assignmentsChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15187 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-24Change std::map<unsigned, LiveInterval*> into a std::map<unsigned,Alkis Evlogimenos
LiveInterval>. This saves some space and removes the pointer indirection caused by following the pointer. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15167 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-24whoops, didn't mean to remove thisChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15157 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-24Completely eliminate the intervals_ list. instead, the r2iMap_ maintainsChris Lattner
ownership of the intervals. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15155 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-24Big change to compute logical value numbers for each LiveRange added to anChris Lattner
Interval. This generalizes the isDefinedOnce mechanism that we used before to help us coallesce ranges that overlap. As part of this, every logical range with a different value is assigned a different number in the interval. For example, for code that looks like this: 0 X = ... 4 X += ... ... N = X We now generate a live interval that contains two ranges: [2,6:0),[6,?:1) reflecting the fact that there are two different values in the range at different positions in the code. Currently we are not using this information at all, so this just slows down liveintervals. In the future, this will change. Note that this change also substantially refactors the joinIntervalsInMachineBB method to merge the cases for virt-virt and phys-virt joining into a single case, adds comments, and makes the code a bit easier to follow. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15154 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-23More minor changes:Chris Lattner
* Inline some functions * Eliminate some comparisons from the release build This is good for another .3 on gcc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15144 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-23Rename LiveIntervals.(cpp|h) -> LiveIntervalAnalysis.(cpp|h)Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15135 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-23Pull the LiveRange and LiveInterval classes out of LiveIntervals.h (whichChris Lattner
will soon be renamed) into their own file. The new file should not emit DEBUG output or have other side effects. The LiveInterval class also now doesn't know whether its working on registers or some other thing. In the future we will want to use the LiveInterval class and friends to do stack packing. In addition to a code simplification, this will allow us to do it more easily. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15134 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-23Improve comments a bitChris Lattner
Use an explicit LiveRange class to represent ranges instead of an std::pair. This is a minor cleanup, but is really intended to make a future patch simpler and less invasive. Alkis, could you please take a look at LiveInterval::liveAt? I suspect that you can add an operator<(unsigned) to LiveRange, allowing us to speed up the upper_bound call by quite a bit (this would also apply to other callers of upper/lower_bound). I would do it myself, but I still don't understand that crazy liveAt function, despite the comment. :) Basically I would like to see this: LiveRange dummy(index, index+1); Ranges::const_iterator r = std::upper_bound(ranges.begin(), ranges.end(), dummy); Turn into: Ranges::const_iterator r = std::upper_bound(ranges.begin(), ranges.end(), index); git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15130 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-23Force coallescing of live ranges that have a single definition, even if theyChris Lattner
interfere. Because these intervals have a single definition, and one of them is a copy instruction, they are always safe to merge even if their lifetimes interfere. This slightly reduces the amount of spill code, for example on 252.eon, from: 12837 spiller - Number of loads added 7604 spiller - Number of stores added 5842 spiller - Number of register spills 18155 liveintervals - Number of identity moves eliminated after coalescing to: 12754 spiller - Number of loads added 7585 spiller - Number of stores added 5803 spiller - Number of register spills 18262 liveintervals - Number of identity moves eliminated after coalescing The much much bigger win would be to merge intervals with multiple definitions (aka phi nodes) but this is not that day. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15124 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-22Fix broken -debug printingChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15115 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-22Sorting is now handled by both linearscan and iterative scan so liveAlkis Evlogimenos
intervals need not be sorted anymore. Removing this redundant step improves LiveIntervals running time by 5% on 176.gcc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15106 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-22That funny 2-address lowering pass can also cause multiple definitions,Chris Lattner
fortunately, they are easy to handle if we know about them. This patch fixes some serious pessimization of code produced by the linscan register allocator. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15092 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-21These files don't need to include <iostream> since they include ↵Brian Gaeke
"Support/Debug.h". git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15089 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-20Remove unneeded functor. LiveInterval has a < operator.Alkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15031 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-19Fix a bug that occurs when the last instruction in a range is deadChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15005 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-19When joining intervals, join intervals in deeply nested loops first. ThisChris Lattner
is a simple change, but seems to improve code a little. For example, on 256.bzip2, we went from 75.0s -> 73.33s (2% speedup). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15004 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-19Split joinIntervals into two methodsChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15003 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-19There is no need to store the MBB along with the MI any more, we can nowChris Lattner
ask instructions for their parent. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14998 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-19Simplify the interface to LiveVariables::addVirtualRegister(Killed|Dead)Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14997 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-19Two changes, both very significant:Chris Lattner
* vreg <-> vreg joining now works, enable it unconditionally when joining is enabled (which is the default). * Fix a serious pessimization of spill code where we were saying that a spilled DEF operand was live into the subsequent instruction. This allows for substantially better code when spilling starts to happen. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14993 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-19See comments. The live intervals were not coming out of the spiller in sortedChris Lattner
order, causing the inactive list in the linearscan list to get unsorted, which basically fuxored everything up severely. These seems to fix the joiner, so with more testing I will enable it by default. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14992 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-19remove the mbbi2mbbMap_, which was just keeping track of mbb order anyway.Chris Lattner
Heavily refactor handleVirtualRegisterDef, adding comments and making it more efficient. It is also much easier to follow and convince ones self that it is correct :) Add -debug output to the joine, showing the result of joining the intervals. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14989 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-17It looks like physref->virtreg joining is working fine. Enable it by defaultChris Lattner
but make virtreg->virtreg joining stay off by default git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14916 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-09Fix typo.Alkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14720 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-09Improve code comments.Alkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14719 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-07Disable coalescing.Alkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14655 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-06Do not crash when joining two intervals of registers of differentAlkis Evlogimenos
classes: just ignore that move. Thanks to Vladimir Prus who found the bug! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14644 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-02Revert patches 1.79 and 1.80 which had to do with dead MBB's. Now that theyChris Lattner
don't exist, we don't have to pretend to handle them. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14567 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-01Now that MachineFunction/MachineBasicBlock keep a mapping of blocks to ID #'sChris Lattner
use them instead of a local LiveVariables numbering git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14523 91177308-0d34-0410-b5e6-96231b3b80d8
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