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path: root/lib/CodeGen/SimpleRegisterCoalescing.cpp
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2008-02-13Initial support for copy elimination by commuting its definition MI.Evan Cheng
PR1877. A3 = op A2 B0<kill> ... B1 = A3 <- this copy ... = op A3 <- more uses ==> B2 = op B0 A2<kill> ... B1 = B2 <- now an identify copy ... = op B2 <- more uses This speeds up FreeBench/neural by 29%, Olden/bh by 12%, oopack_v1p8 by 53%. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47046 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
2008-02-09Remove unused hidden option.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46903 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
2008-01-0480-column violations.Bill Wendling
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45574 91177308-0d34-0410-b5e6-96231b3b80d8
2007-12-31update a couple of references to SSARegMap.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45468 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
2007-12-30More cleanups for MachineOperand:Chris Lattner
- Eliminate the static "print" method for operands, moving it into MachineOperand::print. - Change various set* methods for register flags to take a bool for the value to set it to. Remove unset* methods. - Group methods more logically by operand flavor in MachineOperand.h git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45461 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
2007-12-20The physical register + virtual register joining requirement was much too ↵Evan Cheng
strict. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45253 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
2007-12-07Add an option to control this heuristic tweak so I can test it.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44671 91177308-0d34-0410-b5e6-96231b3b80d8
2007-12-06Fix for PR1831: if all defs of an interval are re-materializable, then it's ↵Evan Cheng
a preferred spill candiate. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44644 91177308-0d34-0410-b5e6-96231b3b80d8
2007-11-29Replace the odd kill# hack with something less fragile.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44434 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
2007-11-14Clean up sub-register implementation by moving subReg information back toEvan Cheng
MachineOperand auxInfo. Previous clunky implementation uses an external map to track sub-register uses. That works because register allocator uses a new virtual register for each spilled use. With interval splitting (coming soon), we may have multiple uses of the same register some of which are of using different sub-registers from others. It's too fragile to constantly update the information. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44104 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
2007-11-06First step towards moving the coalescer to priority_queue based machinery.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43764 91177308-0d34-0410-b5e6-96231b3b80d8
2007-11-05Move SimpleRegisterCoalescing.h to lib/CodeGen since there is now a commonEvan Cheng
register coalescer interface: RegisterCoalescing. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43714 91177308-0d34-0410-b5e6-96231b3b80d8
2007-11-05Skip over deleted val#'s.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43700 91177308-0d34-0410-b5e6-96231b3b80d8
2007-11-01- Coalesce extract_subreg when both intervals are relatively small.Evan Cheng
- Some code clean up. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43606 91177308-0d34-0410-b5e6-96231b3b80d8
2007-10-18Really fix PR1734. Carefully track which register uses are sub-register uses byEvan Cheng
traversing inverse register coalescing map. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43118 91177308-0d34-0410-b5e6-96231b3b80d8
2007-10-17One more extract_subreg coalescing bug fix.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43065 91177308-0d34-0410-b5e6-96231b3b80d8
2007-10-16Fix PR1734.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43035 91177308-0d34-0410-b5e6-96231b3b80d8
2007-10-16Code clean up.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43026 91177308-0d34-0410-b5e6-96231b3b80d8
2007-10-15Fix PR1729: watch out for val# with no def.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42996 91177308-0d34-0410-b5e6-96231b3b80d8
2007-10-14When coalescing an EXTRACT_SUBREG and the dst register is a physical register,Evan Cheng
the source register will be coalesced to the super register of the LHS. Properly merge in the live ranges of the resulting coalesced interval that were part of the original source interval to the live interval of the super-register. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42961 91177308-0d34-0410-b5e6-96231b3b80d8
2007-10-12Restrict EXTRACT_SUBREG coalescing to avoid negative performance impact.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42903 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
2007-10-10Bad choice of variable name.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42821 91177308-0d34-0410-b5e6-96231b3b80d8
2007-10-09Fix an extremely stupid bug that prevented first round of coalescing ↵Evan Cheng
(physical registers only) from happening. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42820 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
2007-09-06Pluggable coalescers inplementation.David Greene
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41743 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
2007-09-01More tweaks to improve compile time.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41669 91177308-0d34-0410-b5e6-96231b3b80d8
2007-08-31std::map -> DenseMap for slight compile time benefit.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41650 91177308-0d34-0410-b5e6-96231b3b80d8
2007-08-31Use std::map instead of a (potentially very sparse) array to track val# ↵Evan Cheng
defined by copy from the other live range. Minor compile time win when number of val# is large. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41640 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
2007-08-28Recover most of the compile time regression due to recent live interval changes.Evan Cheng
1. Eliminate the costly live interval "swapping". 2. Change ValueNumberInfo container from SmallVector to std::vector. The former performs slowly when the vector size is very large. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41536 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
2007-08-14Fix for PR1596: AdjustCopiesBackFrom() should conservatively check if any of ↵Evan Cheng
its sub-registers may overlap with the interval of the copy that's being coalesced. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41084 91177308-0d34-0410-b5e6-96231b3b80d8
2007-08-14Kill info update bugs.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41064 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
2007-08-12No need to remove dead range from soon-to-be-dead live interval. Its val# ↵Evan Cheng
may be out of whack. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41024 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
2007-08-09unbreak the buildChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40976 91177308-0d34-0410-b5e6-96231b3b80d8
2007-08-09Bug fix. ~1U marks the val# dead.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40975 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
2007-08-05shorten this nameChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40843 91177308-0d34-0410-b5e6-96231b3b80d8
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