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path: root/lib/CodeGen/LiveIntervalAnalysis.cpp
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2007-10-12Did mean to leave this in. INSERT_SUBREG isn't being coalesced yet.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42916 91177308-0d34-0410-b5e6-96231b3b80d8
2007-10-12EXTRACT_SUBREG coalescing support. The coalescer now treats EXTRACT_SUBREG likeEvan Cheng
(almost) a register copy. However, it always coalesced to the register of the RHS (the super-register). All uses of the result of a EXTRACT_SUBREG are sub- register uses which adds subtle complications to load folding, spiller rewrite, etc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42899 91177308-0d34-0410-b5e6-96231b3b80d8
2007-10-08Kill cycle of an live range is always the last use index + 1.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42742 91177308-0d34-0410-b5e6-96231b3b80d8
2007-10-03Use empty() member functions when that's what's being tested for insteadDan Gohman
of comparing begin() and end(). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42585 91177308-0d34-0410-b5e6-96231b3b80d8
2007-09-14Remove isReg, isImm, and isMBB, and change all their users to use Dan Gohman
isRegister, isImmediate, and isMachineBasicBlock, which are equivalent, and more popular. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41958 91177308-0d34-0410-b5e6-96231b3b80d8
2007-09-06Fix a memory leak.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41739 91177308-0d34-0410-b5e6-96231b3b80d8
2007-09-05Use pool allocator for all the VNInfo's to improve memory access locality. ↵Evan Cheng
This reduces coalescing time on siod Mac OS X PPC by 35%. Also remove the back ptr from VNInfo to LiveInterval and other tweaks. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41729 91177308-0d34-0410-b5e6-96231b3b80d8
2007-08-30Try fold re-materialized load instructions into its uses.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41598 91177308-0d34-0410-b5e6-96231b3b80d8
2007-08-29Change LiveRange so it keeps a pointer to the VNInfo rather than an index.Evan Cheng
Changes related modules so VNInfo's are not copied. This decrease copy coalescing time by 45% and overall compilation time by 10% on siod. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41579 91177308-0d34-0410-b5e6-96231b3b80d8
2007-08-16Fix some kill info update bugs; add hidden option -disable-rematerialization ↵Evan Cheng
to turn off remat for debugging. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41118 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
2007-08-11Code to maintain kill information during register coalescing.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41016 91177308-0d34-0410-b5e6-96231b3b80d8
2007-08-08Adding kill info to val#.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40925 91177308-0d34-0410-b5e6-96231b3b80d8
2007-08-08- Each val# can have multiple kills.Evan Cheng
- Fix some minor bugs related to special markers on val# def. ~0U means undefined, ~1U means dead val#. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40916 91177308-0d34-0410-b5e6-96231b3b80d8
2007-08-07- LiveInterval value#'s now have 3 components: def instruction #,Evan Cheng
kill instruction #, and source register number (iff the value# is defined by a copy). - Now def instruction # is set for every value#, not just for copy defined ones. - Update some outdated code related inactive live ranges. - Kill info not yet set. That's next patch. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40913 91177308-0d34-0410-b5e6-96231b3b80d8
2007-06-27If a livein is not used in the block. It's live through.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37764 91177308-0d34-0410-b5e6-96231b3b80d8
2007-06-27Fix an obvious bug. Old code only worked for the entry block.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37743 91177308-0d34-0410-b5e6-96231b3b80d8
2007-06-19Replace M_REMATERIALIZIBLE and the newly-added isOtherReMaterializableLoadDan Gohman
with a general target hook to identify rematerializable instructions. Some instructions are only rematerializable with specific operands, such as loads from constant pools, while others are always rematerializable. This hook allows both to be identified as being rematerializable with the same mechanism. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37644 91177308-0d34-0410-b5e6-96231b3b80d8
2007-06-14Add a target hook to allow loads from constant pools to be rematerialized, ↵Dan Gohman
and an implementation for x86. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37576 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
2007-05-14Only worry about intervening kill if there are more than one live ranges in ↵Evan Cheng
the interval. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37052 91177308-0d34-0410-b5e6-96231b3b80d8
2007-05-14Fix for PR1406:Evan Cheng
v1 = r2 = move v1 = op r2<kill> ... r2 = move v1 = op r2<kill> Clear the first r2 kill if v1 and r2 are joined. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37050 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
2007-05-02Fix build error.Lauro Ramos Venancio
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36648 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
2007-04-26Rename findRegisterUseOperand to findRegisterUseOperandIdx to avoid confusion.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36483 91177308-0d34-0410-b5e6-96231b3b80d8
2007-04-25Fix for PR1306.Evan Cheng
- A register def / use now implicitly affects sub-register liveness but does not affect liveness information of super-registers. - Def of a larger register (if followed by a use later) is treated as read/mod/write of a smaller register. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36434 91177308-0d34-0410-b5e6-96231b3b80d8
2007-04-18VarInfo::UsedBlocks is no longer used. Remove.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36250 91177308-0d34-0410-b5e6-96231b3b80d8
2007-04-18Don't populate TryAgainList when coalescing only physical registers with ↵Evan Cheng
virtual registers. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36240 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
2007-04-04Re-materialize all loads from fixed stack slots.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35660 91177308-0d34-0410-b5e6-96231b3b80d8
2007-04-04Trivially re-materializable instructions have spill weights that are half of ↵Evan Cheng
what it would be otherwise. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35658 91177308-0d34-0410-b5e6-96231b3b80d8
2007-04-02Ugh. Copy coalescer does not update register numbers.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35600 91177308-0d34-0410-b5e6-96231b3b80d8
2007-03-30Bug fix for PR1279. When isDead is propagate by copy coalescing, we keep lengthEvan Cheng
of dead def live interval at 1 to avoid multiple def's targeting the same register. The previous patch missed a case where the source operand is live-in. In that case, remove the whole interval. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35512 91177308-0d34-0410-b5e6-96231b3b80d8
2007-03-28Move rematerialization out of beta.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35419 91177308-0d34-0410-b5e6-96231b3b80d8
2007-03-28Fix for PR1279. Dead def has a live interval of length 1. Copy coalescing shouldEvan Cheng
not violate that. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35396 91177308-0d34-0410-b5e6-96231b3b80d8
2007-03-26Fix for PR1266. Don't mark a two address operand IsKill.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35365 91177308-0d34-0410-b5e6-96231b3b80d8
2007-03-22Fix for PR1257. Bug in live range shortening as a result of copy coalescingEvan Cheng
where the destination is dead. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35252 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
2007-03-19Remove -reduce-joining-phys-regs options. Make it on by default.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35165 91177308-0d34-0410-b5e6-96231b3b80d8
2007-03-19Minor bug fix.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35153 91177308-0d34-0410-b5e6-96231b3b80d8
2007-03-18- Merge UsedBlocks info after two virtual registers are coalesced.Evan Cheng
- Use distance to closest use to determine whether to abort coalescing. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35141 91177308-0d34-0410-b5e6-96231b3b80d8
2007-03-17Joining a live interval of a physical register with a virtual one can turn outEvan Cheng
to be really bad. Once they are joined they are not broken apart. Also, physical intervals cannot be spilled! Added a heuristic as a workaround for this. Be careful coalescing with a physical register if the virtual register uses are "far". Check if there are uses in the same loop as the source (copy instruction). Check if it is in the loop preheader, etc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35134 91177308-0d34-0410-b5e6-96231b3b80d8
2007-03-15Debugging output stuff.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35117 91177308-0d34-0410-b5e6-96231b3b80d8
2007-03-03Watch out for cases like this:Evan Cheng
entry (0x8b056f0, LLVM BB @0x8b01b30, ID#0): Live Ins: %r0 %r1 %r2 %r3 %reg1032 = tMOVrr %r3<kill> %reg1033 = tMOVri8 1 %reg1034 = tMOVri8 0 tCMPi8 %reg1029<kill>, 0 tBcc mbb<entry,0x8b06a10>, 0 Successors according to CFG: 0x8b06980 0x8b06a10 entry (0x8b06980, LLVM BB @0x8b01b30, ID#12): Predecessors according to CFG: 0x8b056f0 %reg1036 = tMOVrr %reg1034<kill> Successors according to CFG: 0x8b06a10 entry (0x8b06a10, LLVM BB @0x8b01b30, ID#13): Predecessors according to CFG: 0x8b056f0 0x8b06980 %reg1024<dead> = tMOVrr %reg1030<kill> ... reg1030 and r1 have already been joined. When reg1024 and reg1030 are joined, r1 live range from function entry to the tMOVrr instruction are dead. Eliminate r1 from the livein set of the entry BB, not the BB where the copy is. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34866 91177308-0d34-0410-b5e6-96231b3b80d8
2007-03-02Dead live-in detection bug.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34843 91177308-0d34-0410-b5e6-96231b3b80d8
2007-03-01Oops.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34768 91177308-0d34-0410-b5e6-96231b3b80d8
2007-03-01Track all joined registers and eliminate unneeded kills after all joining ↵Evan Cheng
are done. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34767 91177308-0d34-0410-b5e6-96231b3b80d8
2007-02-26Joining an interval with a dead copy instruction. Shorten the live range to ↵Evan Cheng
the last use. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34645 91177308-0d34-0410-b5e6-96231b3b80d8
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