aboutsummaryrefslogtreecommitdiffstats
path: root/lib/CodeGen/LiveInterval.cpp
Commit message (Collapse)AuthorAgeFilesLines
* Improved tracking of value number kills. VN kills are now representedLang Hames2009-07-091-3/+6
| | | | | | | | | | | | | | as an (index,bool) pair. The bool flag records whether the kill is a PHI kill or not. This code will be used to enable splitting of live intervals containing PHI-kills. A slight change to live interval weights introduced an extra spill into lsr-code-insertion (outside the critical sections). The test condition has been updated to reflect this. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75097 91177308-0d34-0410-b5e6-96231b3b80d8
* Fixed a bug in LiveInterval scaling (failure to scale VNI defs correctly), ↵Lang Hames2009-06-241-1/+2
| | | | | | removed old TODO comments. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74054 91177308-0d34-0410-b5e6-96231b3b80d8
* VNInfo cleanup.Lang Hames2009-06-171-19/+17
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73634 91177308-0d34-0410-b5e6-96231b3b80d8
* Part 1.Evan Cheng2009-06-151-7/+5
| | | | | | | | | | | | | | | | | | | | | | - Change register allocation hint to a pair of unsigned integers. The hint type is zero (which means prefer the register specified as second part of the pair) or entirely target dependent. - Allow targets to specify alternative register allocation orders based on allocation hint. Part 2. - Use the register allocation hint system to implement more aggressive load / store multiple formation. - Aggressively form LDRD / STRD. These are formed *before* register allocation. It has to be done this way to shorten live interval of base and offset registers. e.g. v1025 = LDR v1024, 0 v1026 = LDR v1024, 0 => v1025,v1026 = LDRD v1024, 0 If this transformation isn't done before allocation, v1024 will overlap v1025 which means it more difficult to allocate a register pair. - Even with the register allocation hint, it may not be possible to get the desired allocation. In that case, the post-allocation load / store multiple pass must fix the ldrd / strd instructions. They can either become ldm / stm instructions or back to a pair of ldr / str instructions. This is work in progress, not yet enabled. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73381 91177308-0d34-0410-b5e6-96231b3b80d8
* Move register allocation preference (or hint) from LiveInterval to ↵Evan Cheng2009-06-141-5/+21
| | | | | | MachineRegisterInfo. This allows more passes to set them. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73346 91177308-0d34-0410-b5e6-96231b3b80d8
* Update to in-place spilling framework. Includes live interval scaling and ↵Lang Hames2009-06-021-0/+23
| | | | | | trivial rewriter. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72729 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix PR4034. Bug in LiveInterval::join when it's compacting new valno's.Evan Cheng2009-04-281-1/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70291 91177308-0d34-0410-b5e6-96231b3b80d8
* Also delete last unused val#.Evan Cheng2009-04-271-0/+6
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70212 91177308-0d34-0410-b5e6-96231b3b80d8
* Reuse unused val#'s to avoid running out of memory in extreme cases.Evan Cheng2009-04-251-1/+5
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70069 91177308-0d34-0410-b5e6-96231b3b80d8
* Do not share a single unknown val# for all the live ranges merged into a ↵Evan Cheng2009-04-251-19/+13
| | | | | | physical sub-register live interval. When coalescer is merging in clobbered virtaul register live interval into a physical register live interval, give each virtual register val# a separate val# in the physical register live interval. Otherwise, the coalescer would have lost track of the definitions information it needs to make correct coalescing decisions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70026 91177308-0d34-0410-b5e6-96231b3b80d8
* Add a new LiveInterval::overlaps(). It checks if the live interval overlaps ↵Evan Cheng2009-04-181-0/+16
| | | | | | a range specified by [Start, End). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69434 91177308-0d34-0410-b5e6-96231b3b80d8
* Implement support for using modeling implicit-zero-extension on x86-64Dan Gohman2009-04-081-16/+33
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | with SUBREG_TO_REG, teach SimpleRegisterCoalescing to coalesce SUBREG_TO_REG instructions (which are similar to INSERT_SUBREG instructions), and teach the DAGCombiner to take advantage of this on targets which support it. This eliminates many redundant zero-extension operations on x86-64. This adds a new TargetLowering hook, isZExtFree. It's similar to isTruncateFree, except it only applies to actual definitions, and not no-op truncates which may not zero the high bits. Also, this adds a new optimization to SimplifyDemandedBits: transform operations like x+y into (zext (add (trunc x), (trunc y))) on targets where all the casts are no-ops. In contexts where the high part of the add is explicitly masked off, this allows the mask operation to be eliminated. Fix the DAGCombiner to avoid undoing these transformations to eliminate casts on targets where the casts are no-ops. Also, this adds a new two-address lowering heuristic. Since two-address lowering runs before coalescing, it helps to be able to look through copies when deciding whether commuting and/or three-address conversion are profitable. Also, fix a bug in LiveInterval::MergeInClobberRanges. It didn't handle the case that a clobber range extended both before and beyond an existing live range. In that case, multiple live ranges need to be added. This was exposed by the new subreg coalescing code. Remove 2008-05-06-SpillerBug.ll. It was bugpoint-reduced, and the spiller behavior it was looking for no longer occurrs with the new instruction selection. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68576 91177308-0d34-0410-b5e6-96231b3b80d8
* Two coalescer fixes in one.Evan Cheng2009-03-111-2/+41
| | | | | | | | 1. Use the same value# to represent unknown values being merged into sub-registers. 2. When coalescer commute an instruction and the destination is a physical register, update its sub-registers by merging in the extended ranges. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66610 91177308-0d34-0410-b5e6-96231b3b80d8
* MergeValueInto is too smart: it might choose to do the merge the opposite ↵Owen Anderson2009-02-021-1/+3
| | | | | | | | | | direction. Live interval reconstruction needs to account for this, and scour its maps to prevent dangling references. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63558 91177308-0d34-0410-b5e6-96231b3b80d8
* Exit with nice warnings when register allocator run out of registers.Evan Cheng2009-01-291-0/+10
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63267 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix comment about removeRange.Evan Cheng2009-01-291-1/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63255 91177308-0d34-0410-b5e6-96231b3b80d8
* Next round of earlyclobber handling. Approach theDale Johannesen2008-09-241-4/+0
| | | | | | | | | | | | RA problem by expanding the live interval of an earlyclobber def back one slot. Remove overlap-earlyclobber throughout. Remove earlyclobber bits and their handling from live internals. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56539 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove AsmThatEarlyClobber etc. from LiveIntervalAnalysisDale Johannesen2008-09-191-0/+4
| | | | | | | | | and redo as linked list walk. Logic moved into RA. Per review feedback. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56326 91177308-0d34-0410-b5e6-96231b3b80d8
* Use empty() instead of begin() == end().Dan Gohman2008-08-141-1/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54780 91177308-0d34-0410-b5e6-96231b3b80d8
* Instead of adding an isSS field to LiveInterval to denote stack slot. Use ↵Evan Cheng2008-06-231-2/+2
| | | | | | top bit of 'reg' instead. If the top bit is set, than the LiveInterval represents a stack slot live interval. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52639 91177308-0d34-0410-b5e6-96231b3b80d8
* Add a stack slot coloring pass. Not yet enabled.Evan Cheng2008-06-041-2/+18
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51934 91177308-0d34-0410-b5e6-96231b3b80d8
* Rename PrintableName to Name.Bill Wendling2008-02-261-1/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47629 91177308-0d34-0410-b5e6-96231b3b80d8
* Change "Name" to "AsmName" in the target register info. Gee, a refactoring toolBill Wendling2008-02-261-1/+1
| | | | | | | would have been a Godsend here! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47625 91177308-0d34-0410-b5e6-96231b3b80d8
* Update gcc 4.3 warnings fix patch with recent head changesAnton Korobeynikov2008-02-201-1/+2
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47368 91177308-0d34-0410-b5e6-96231b3b80d8
* - Removing the infamous r2rMap_ and rep() method. Now the coalescer will updateEvan Cheng2008-02-151-0/+21
| | | | | | | | register defs and uses after each successful coalescing. - Also removed a number of hacks and fixed some subtle kill information bugs. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47167 91177308-0d34-0410-b5e6-96231b3b80d8
* - Added removeValNo() to remove all live ranges of a particular value#.Evan Cheng2008-02-131-7/+61
| | | | | | | - removeRange() can now update value# information. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47044 91177308-0d34-0410-b5e6-96231b3b80d8
* Rename MRegisterInfo to TargetRegisterInfo.Dan Gohman2008-02-101-4/+5
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46930 91177308-0d34-0410-b5e6-96231b3b80d8
* Fixed a bug in MergeValueInAsValue() pointed out by David Greene. Replace ↵Evan Cheng2008-01-301-3/+3
| | | | | | val# with previous liverange's. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46579 91177308-0d34-0410-b5e6-96231b3b80d8
* remove dead #includeChris Lattner2008-01-141-1/+0
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45971 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove attribution from file headers, per discussion on llvmdev.Chris Lattner2007-12-291-2/+2
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45418 91177308-0d34-0410-b5e6-96231b3b80d8
* Replace the odd kill# hack with something less fragile.Evan Cheng2007-11-291-1/+3
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44434 91177308-0d34-0410-b5e6-96231b3b80d8
* Kill info update bug.Evan Cheng2007-11-291-0/+3
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44427 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix MergeValueInAsValue(). It allows overlapping live ranges but should replaceEvan Cheng2007-10-171-7/+57
| | | | | | | their value numbers with the specified value number. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43062 91177308-0d34-0410-b5e6-96231b3b80d8
* When coalescing an EXTRACT_SUBREG and the dst register is a physical register,Evan Cheng2007-10-141-1/+1
| | | | | | | | | 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
* EXTRACT_SUBREG coalescing support. The coalescer now treats EXTRACT_SUBREG likeEvan Cheng2007-10-121-0/+37
| | | | | | | | | | (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
* Constify to catch bugs.David Greene2007-09-061-2/+2
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41751 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix a memory leak.Evan Cheng2007-09-061-0/+2
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41739 91177308-0d34-0410-b5e6-96231b3b80d8
* Use pool allocator for all the VNInfo's to improve memory access locality. ↵Evan Cheng2007-09-051-36/+18
| | | | | | 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
* More tweaks to improve compile time.Evan Cheng2007-09-011-22/+35
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41669 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove an unnecessary element, saving 4 bytes per LiveInterval.Evan Cheng2007-08-311-3/+0
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41641 91177308-0d34-0410-b5e6-96231b3b80d8
* Change LiveRange so it keeps a pointer to the VNInfo rather than an index.Evan Cheng2007-08-291-52/+78
| | | | | | | | 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
* Recover most of the compile time regression due to recent live interval changes.Evan Cheng2007-08-281-27/+19
| | | | | | | | | 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
* Kill info update bugs.Evan Cheng2007-08-141-1/+2
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41064 91177308-0d34-0410-b5e6-96231b3b80d8
* Kill info update bugs.Evan Cheng2007-08-131-5/+2
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41043 91177308-0d34-0410-b5e6-96231b3b80d8
* Code to maintain kill information during register coalescing.Evan Cheng2007-08-111-11/+32
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41016 91177308-0d34-0410-b5e6-96231b3b80d8
* Clean up and bug fix.Evan Cheng2007-08-081-1/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40921 91177308-0d34-0410-b5e6-96231b3b80d8
* - Each val# can have multiple kills.Evan Cheng2007-08-081-6/+3
| | | | | | | | - 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
* Remove a dead assertion.Evan Cheng2007-08-081-1/+0
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40914 91177308-0d34-0410-b5e6-96231b3b80d8
* - LiveInterval value#'s now have 3 components: def instruction #,Evan Cheng2007-08-071-7/+12
| | | | | | | | | | | 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
* It's not necessary to do rounding for alloca operations when the requestedDan Gohman2007-07-181-0/+526
alignment is equal to the stack alignment. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40004 91177308-0d34-0410-b5e6-96231b3b80d8
generated by cgit v1.1 at 2025-05-18 01:17:56 +0000