search for: liveregmatrix

...must me mapped to some register of a class Z AND there's an interception between the ranges of X and ranges of Y", that's something like "X overlaps Y, which are the same type". This deffinition differs from the definition I've found reading the source code. In the class LiveRegMatrix, which is queried to check interferences you ask something "does virtual register X interfere in physical register Y?". But I realized the answer is yes only if register Y has been already assigned to another virtual register. I confess I couldn't understand why it was implemented in...

...ped to some register of a class Z AND there's an interception between the ranges of X and ranges of Y", that's something like "X overlaps Y, which are the same type". > > This deffinition differs from the definition I've found reading the source code. In the class LiveRegMatrix, which is queried to check interferences you ask something "does virtual register X interfere in physical register Y?". But I realized the answer is yes only if register Y has been already assigned to another virtual register. > > I confess I couldn't understand why it was impl...

...L1->overlaps(RG1) Where L1 is a Live Interval and RG1 is a RegUnit for an arbitrary physical register. I saw this second method in the PBQP allocator code, I think that maybe will be related to avoid allocation to reserved physical registers or for a on-the-fly check for interference, but the LiveRegMatrix already do that. So my question is: Considering that I will build this interference graph before any assignment (with information only about the Liveness Analisys) and I freeze all reserved physical registers before perform register allocation, should I use the first or the second method? If the s...

...a Live Interval and RG1 is a RegUnit for an arbitrary > physical register. > > > > I saw this second method in the PBQP allocator code, I think that maybe > will be related to avoid allocation to reserved physical registers or for a > on-the-fly check for interference, but the LiveRegMatrix already do that. > > > > So my question is: Considering that I will build this interference graph > before any assignment (with information only about the Liveness Analisys) > and I freeze all reserved physical registers before perform register > allocation, should I use the fi...

...f the algorithm, some movements are applied to this solution in order to find a better solution. To apply such movements, I need to unassign a virtual register from a physical register and one from the memory, and swap those two. To unassign from a physical register, the method *unassign* from the *LiveRegMatrix* class can be used. But, in the other hand, the class *InlineSpiller* doesn't provide a similar method, like *unspill*. So I thought, instead of applying the spill directly during the first phase of the algorithm, I would store the virtual registers candidates to spill in an auxiliary structur...

...anti-dep breaker to leave that instruction alone while still being able to break other anti-dependencies on condition code registers. If that is not enough, you will very soon be able to inject a target-dependent pass between register allocation and virtual register rewriting. You can use the new LiveRegMatrix interface to change the virtual register assignments, for example to loosen anti-dependencies. I expect to have this ready within the next week. /jakob

...ne-sink -peephole-opts -dead-mi-elimination -processimpdefs -unreachable-mbb-elimination -livevars -machinedomtree -machine-loops -phi-node-elimination -twoaddressinstruction -slotindexes -liveintervals -simple-register-coalescing -misched -machine-block-freq -livedebugvars -livestacks -virtregmap -liveregmatrix -edge-bundles -spill-code-placement -virtregrewriter -stack-slot-coloring -machinelicm -edge-bundles -prologepilog -machine-block-freq -branch-folder -tailduplication -machine-cp -postrapseudos -machinedomtree -machine-loops -post-RA-sched -gc-analysis -machine-block-freq -block-placement2 -stackma...

On PowerPC (at least versions which predate the mfocrf instruction), while there are multiple independent condition registers, the only way to move those registers into a general-purpose register is to use mfcr, which transfers all of the (concatenated) condition registers into one general purpose register, followed by a mask/shift operation to extract the desired pieces. I would like to know if

I'm working on my project for completion undergraduate courses, consisting of an experimental analysis of registers allocation algorithms. For this task, I am using the set of tools from the LLVM project. However, I have read the documentation of the LLVM project and not yet found a way to put the pieces of the puzzle together. So far I know: - As passes work as engage them to LLVM and

...eak-false-deps -callsite-splitting-ipsccp -codegenprepare -consthoist -dead-mi-elimination -detect-dead-lanes -early-ifcvt -early-machinelicm -early-tailduplication -expandmemcmp -greedy -interleaved-access -iv-users -lazy-block-freq-opt-remark-emitter -livedebugvars -liveintervals -liveregmatrix -livestacks -livevars -loop-reduce -loop-simplify-lcssa-verification -lrshrink -machine-block-freq -machine-combiner -machine-cp -machine-cse -machinedomtree-machine-loops -machinelicm -machine-loops -machinepostdomtree -machinepostdomtree-block-placement -machine-scheduler -machine...

...> >> -early-tailduplication >> >> -expandmemcmp >> >> -greedy >> >> -interleaved-access >> >> -iv-users >> >> -lazy-block-freq-opt-remark-emitter >> >> -livedebugvars >> >> -liveintervals >> >> -liveregmatrix >> >> -livestacks >> >> -livevars >> >> -loop-reduce >> >> -loop-simplify-lcssa-verification >> >> -lrshrink >> >> -machine-block-freq >> >> -machine-combiner >> >> -machine-cp >> >> -machine...

...ses library function ( for a library function register allocation is not done by LLVM so this optimization will simply skip them) Study and Other: ============= I have learned following things in LLVM, how it stores reg clobbering information? how it is used by Reg allocators through LivePhysRegs, LiveRegMatrix and other related passes? How to schedule a pass using TargetPassConfig and TargetMachine? What are called callee saved registers? What is an Immutable Pass? Apart from that I have also learned how to use phabricator to send review request. I have also read some related literatures. During this we...

...ould set this attribute on a special form of the comparison instruction, and that would be a work-around for now. > > If that is not enough, you will very soon be able to inject a > target-dependent pass between register allocation and virtual > register rewriting. You can use the new LiveRegMatrix interface to > change the virtual register assignments, for example to loosen > anti-dependencies. I expect to have this ready within the next week. > Sounds good; let's talk about this when it is ready. Also, I think the following might work well: If we add a special kind of regis...

...ion is not done by LLVM so this optimization will simply >> skip them) >> >> Study and Other: >> ============= >> I have learned following things in LLVM, how it stores reg clobbering >> information? how it is used by Reg allocators through LivePhysRegs, >> LiveRegMatrix and other related passes? How to schedule a pass using >> TargetPassConfig and TargetMachine? What are called callee saved registers? >> What is an Immutable Pass? Apart from that I have also learned how to use >> phabricator to send review request. I have also read some related &...

...his optimization will simply >>> skip them) >>> >>> Study and Other: >>> ============= >>> I have learned following things in LLVM, how it stores reg clobbering >>> information? how it is used by Reg allocators through LivePhysRegs, >>> LiveRegMatrix and other related passes? How to schedule a pass using >>> TargetPassConfig and TargetMachine? What are called callee saved registers? >>> What is an Immutable Pass? Apart from that I have also learned how to use >>> phabricator to send review request. I have also read so...

...hem) >>>>> >>>>> Study and Other: >>>>> ============= >>>>> I have learned following things in LLVM, how it stores reg clobbering >>>>> information? how it is used by Reg allocators through LivePhysRegs, >>>>> LiveRegMatrix and other related passes? How to schedule a pass using >>>>> TargetPassConfig and TargetMachine? What are called callee saved registers? >>>>> What is an Immutable Pass? Apart from that I have also learned how to use >>>>> phabricator to send review requ...

...t;>>> Study and Other: >>>>>>> ============= >>>>>>> I have learned following things in LLVM, how it stores reg >>>>>>> clobbering information? how it is used by Reg allocators through >>>>>>> LivePhysRegs, LiveRegMatrix and other related passes? How to schedule a >>>>>>> pass using TargetPassConfig and TargetMachine? What are called callee saved >>>>>>> registers? What is an Immutable Pass? Apart from that I have also learned >>>>>>> how to use phabric...

...xt.cpp for Release+Asserts build llvm[2]: Compiling LiveRangeEdit.cpp for Release+Asserts build llvm[2]: Compiling Object.cpp for Release+Asserts build llvm[3]: Compiling DWARFDebugInfoEntry.cpp for Release+Asserts build llvm[2]: Compiling ObjectFile.cpp for Release+Asserts build llvm[2]: Compiling LiveRegMatrix.cpp for Release+Asserts build llvm[3]: Compiling DWARFDebugLine.cpp for Release+Asserts build llvm[2]: Compiling RecordStreamer.cpp for Release+Asserts build llvm[2]: Compiling MCDwarf.cpp for Release+Asserts build llvm[2]: Compiling SymbolSize.cpp for Release+Asserts build llvm[3]: Compiling DWARF...