similar to: [LLVMdev] Graph coloring register allocator for the x86

On Sun, 28 Dec 2003, Anshu Dasgupta wrote: > CodeGen/RegAlloc/PhysRegAlloc.cpp implements a graph coloring register > allocator for the Sparc back end. It requests target machine register > information via a call to getRegInfo() which returns a class > TargetRegInfo containing the required information. For the x86 target > machine, this interface has not been implemented. Is an

Hi all, Just wanted to announce that I've implemented a preliminary version of a Chaitin-Briggs graph coloring register allocator for the LLVM x86 back-end. Right now, as it stands, the allocator works correctly for the benchmarks that I tested it on (from the LLVM test suite and some of the SPEC benchmarks). It performs better than the local register allocator in terms of spills and

Hi all, The register allocator that I implemented is failing in the LLVM cvs version, but not in LLVM 1.1. The generated code fails a check in the x86 peephole optimizer: llc: PeepholeOptimizer.cpp:128: bool <unnamed>::PH::PeepholeOptimize(llvm::Machi neBasicBlock&, llvm::ilist_iterator<llvm::MachineInstr>&): Assertion `MI->getNum Operands() == 2 && "These

Hello, I am working on developing register allocator for irregular architectures (with register pair, and banks) and plan to base my work on graph coloring register allocator. I wonder if LLVM already has basic graph coloring register allocator, or somebody is working on it? Also, I'm not sure what is the best way to even describe the register constraints in tablegen: - How can I

Hi, --- Anton Vayvod <avayvod at gmail.com> wrote: > On 4/3/07, David Greene <greened at obbligato.org> wrote: > > > > I'm just starting to dive into llvm, hoping to implement a > > good graph coloring register allocator. I gather that this > > has been discussed before. > > > > What is the RegAllocGraphColoring.cpp currently in the >

On 4/3/07, David Greene <greened at obbligato.org> wrote: > > I'm just starting to dive into llvm, hoping to implement a > good graph coloring register allocator. I gather that this > has been discussed before. > > What is the RegAllocGraphColoring.cpp currently in the > sources? It seems to be the Fred Chow algorithm but > it's not mentioned in the

--- David Greene <greened at obbligato.org> wrote: > Roman Levenstein wrote: > > The allocator does not handle register aliases and register classes > > correctly, which makes it rather unusable for most architectures. > One > > idea that can be used for improving handling of irregular > architectures > > is described in the "A Generalized Algorithm for

On 12/14/2017 10:18 PM, Leslie Zhai wrote: > Hi GCC and LLVM developers, > > I am learning Register Allocation algorithms and I am clear that: > > * Unlimited VirtReg (pseudo) -> limited or fixed or alias[1] PhysReg > (hard) > > * Memory (20 - 100 cycles) is expensive than Register (1 cycle), but > it has to spill code when PhysReg is unavailable > It might be

Dear all, I was looking for to compile some benchmarks and generate code using different register allocation algorithms. As i can see, the built in options for register allocation in llvm are 1. Simple 2. Local 3. Linear Scan I want to compare the generating code also with a graph coloring based register allocation approach. Is this also built in by default by llvm. Are there some other

Roman Levenstein wrote: > The allocator does not handle register aliases and register classes > correctly, which makes it rather unusable for most architectures. One > idea that can be used for improving handling of irregular architectures > is described in the "A Generalized Algorithm for Graph-Coloring > Register Allocation" by Michael D. Smith, Norman Ramsey and Glenn

Hi, I'm not very familiar with the code generation, but this seems like a good opportunity to ask... Has anyone tried optimal graph coloring algorithms? Yeah, it's NP, but the chances are that you are not looking at that many variables at the same time. I'm wondering how much could one improve the register allocation by using optimal algorithms, and how much impact would that have on

I'm just starting to dive into llvm, hoping to implement a good graph coloring register allocator. I gather that this has been discussed before. What is the RegAllocGraphColoring.cpp currently in the sources? It seems to be the Fred Chow algorithm but it's not mentioned in the documentation anywhere. Does it work? -Dave

Roman Levenstein wrote: > Yes, the SUIF allocator (or at least one of them) implements the > Smith/Ramsey/Holloway algorithm. This is what I understand by looking > at the coloring reggister allocator code in the SUIF distribution. The > SUIF code of this allocator is not very well commented, but I'm pretty > sure. Do you have a pointer? I'm interested in this algorithm

Hi Dave, --- David Greene <greened at obbligato.org> wrote: > Roman Levenstein wrote: > > > Yes, the SUIF allocator (or at least one of them) implements the > > Smith/Ramsey/Holloway algorithm. This is what I understand by > looking > > at the coloring reggister allocator code in the SUIF distribution. > The > > SUIF code of this allocator is not very

I've been looking at compilation time issues in the LICM pass, and it looks to me like colorEHFunclets() is probably being called a lot more often than it needs to be for functions that have Windows EH personality functions. For one thing, the funclet coloring is happening when computeLoopSafetyInfo() is called from LoopIdiomRecognize and LoopUnswitch but those passes don't use the

Hey, Anton, yes, I have an implementation of a register allocator for LLVM. I Don't build the interference graph though. I perform a linear scan on the dominator tree. The difference from my algorithm to LLVM's linear scan is that I perform register allocation before the SSA-elimination step. I have it working, but did not commit, because I did not implement it using LLVM's

Dear LLVM community, In 2007 Lang Hames developed a Graph Coloring Register Allocator. This allocator was created based on the paper " A generalized algorithm for graph-coloring register allocation" (http://doi.acm.org/10.1145/996841.996875). This algorithm is graph based, and is concerned with register banks that have different register classes and registers that alias. Lang

Hi Matthias, Thanks for your hint! It is just for learning and practicing for me, just like migrate DragonEgg http://lists.llvm.org/pipermail/llvm-dev/2017-September/117201.html the motivating is for learning from GCC and LLVM developers. 在 2017年12月19日 10:07, Matthias Braun 写道: > > >> On Dec 18, 2017, at 9:52 AM, Leslie Zhai via llvm-dev >> <llvm-dev at lists.llvm.org

Dear all, I have no problem coloring the axis and plot, following these procedures: http://www.nabble.com/Coloring-X-and-Y-axis-tt22989739r0.html#a22989739 However the X,Y and Main Label stays in black. How can we change their colors? - Gundala Viswanath Jakarta - Indonesia

Dear R'ers, I am wondering what is the smallest geographicterritorial unit available for formatting in Canada. Provinces? I know that in the US it is the county so that I can color US counties any way I want, for example: ### Example for coloring US counties ### Creating an ARTIFICIAL criterion for coloring US counties: library(maps) allcounties<-data.frame(county=map('county',