similar to: [LLVMdev] x86 Graph coloring register allocator

Hi all, I was looking at the register allocator code and had a question about that: 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

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 Leslie, I suggest adding these 3 papers to your reading list. Register allocation for programs in SSA-form Sebastian Hack, Daniel Grund, and Gerhard Goos http://www.rw.cdl.uni-saarland.de/~grund/papers/cc06-ra_ssa.pdf Simple and Efficient Construction of Static Single Assignment Form Matthias Braun , Sebastian Buchwald , Sebastian Hack , Roland Leißa , Christoph Mallon , and Andreas

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

On Saturday 01 May 2010 08:34:50 Josef Eisl wrote: > Hello, > > I want learn more about register allocation and do some analysis for a > current research project. After reading some papers (eg. Chaitin, > Briggs) I think its time to get my hands dirty :). Welcome! > First I plan to (re)implement some of the classic approaches to get > familiar with the framework. Before

I seem to recall that LLVM had a Chaitin/Briggs register allocator, but looking at today's source, I only see a Linear Scan and some basic block allocators. Does anyone know if a Chaitin/Briggs allocator for LLVM exists and is available? Peter

Hello, I want learn more about register allocation and do some analysis for a current research project. After reading some papers (eg. Chaitin, Briggs) I think its time to get my hands dirty :). First I plan to (re)implement some of the classic approaches to get familiar with the framework. At the beginning the following questions came up: - Is there some documentation about register allocation

> On Sep 11, 2018, at 11:42 AM, Quentin Colombet <quentin.colombet at gmail.com> wrote: > > Le mar. 11 sept. 2018 à 11:23, Preston Briggs > <preston.briggs at gmail.com> a écrit : >> >> Yes, I quite liked the things I've read about the PBQP allocator. >> >> Given what the hardware folks have to go through to get 1% improvements in scalar code,

Hi, We noticed that LLVM has implemented register allocation using PBQP and Briggs as a heuristic for spilling. Is there a direct implementation of the Chaitin-Briggs register allocation algorithm? We intend to modify parts of this algorithm in order to implement a variant of it. It will save us a lot of time if it is already implemented, rather than writing the code from scratch. Thanks and

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

Yes, I quite liked the things I've read about the PBQP allocator. Given what the hardware folks have to go through to get 1% improvements in scalar code, spending 20% (or whatever) compile time (under control of a flag) seems like nothing. And falling back on "average code" is a little disingenuous. People looking for performance don't care about average code; they care about

Hi, Using Chaitin's approach, removing a copy via coalescing could expose more opportunities for coalescing. So he would iteratively rebuild the interference graph and check for more opportunities. Chaitin was also careful to make sure that the source and destination of a copy didn't interfere unnecessarily (because of the copy alone); that is, his approach to interference was very

David Greene wrote: > On Saturday 01 May 2010 08:34:50 Josef Eisl wrote: >> Hello, >> >> I want learn more about register allocation and do some analysis for a >> current research project. After reading some papers (eg. Chaitin, >> Briggs) I think its time to get my hands dirty :). > > Welcome! > >> First I plan to (re)implement some of the classic

Hi, We noticed that LLVM has implemented register allocation using PBQP and Briggs as a heuristic for spilling. Is there a direct implementation of the Chaitin-Briggs register allocation algorithm? We intend to modify parts of this algorithm in order to implement a variant of it. It will save us a lot of time if it is already implemented, rather than writing the code from scratch. Thanks and

> On Sep 10, 2018, at 5:25 PM, Matthias Braun <mbraun at apple.com> wrote: > > > >> On Sep 10, 2018, at 5:11 PM, Preston Briggs <preston.briggs at gmail.com <mailto:preston.briggs at gmail.com>> wrote: >> >> The phi instruction is irrelevant; just the way I think about things. >> The question is if the allocator believes that t0 and t2

Hi Anshu, I got a testbench which fails (and segfaults) consistently with an environment (gcc + os) conveniently preserved in a virtual machine. I will confirm that it is gone there and report. Thanks for the fix :) Carlos 2012/12/10 Anshuman Dasgupta <adasgupt at codeaurora.org> > Carlos, > > I committed a fix in r169783. Thanks for catching this. > > However, I could

I missed last 2 commits made by Alexey. Following his advices, I updated the patch. It should be ok now. Ivan On 27/06/2012 21:42, Anshuman Dasgupta wrote: > Committed in r159281. > > -Anshu > > > On 6/26/2012 3:04 AM, Ivan Llopard wrote: >> Hi Anshu, >> >> I don't have commit access. It applies correctly on trunk, I've just >> checked it.

On 28/08/2012 00:21, Anshuman Dasgupta wrote: > Ivan, > > Thanks for working on the patch. It looks good to me except for the > removal of the Transition class: > > > (1) Should I completely remove Transition and create a map structure > in State (input, state) to replace them? > > Yes, please remove the Transition class and create a map structure in > State

Hi Ivan, Sorry, I should have been more explicit in my last email. The patch looks good to me. Please check that it applies on trunk and go ahead and commit. Thanks -Anshu > Hi Anshu, > > Just in case you have forgotten this thread ;-). Is this patch ok to > commit or does it not apply to trunk properly ? > I can fix it if that's the problem. > > Ivan > > On

Hi Anshu, Just in case you have forgotten this thread ;-). Is this patch ok to commit or does it not apply to trunk properly ? I can fix it if that's the problem. Ivan On 20/06/2012 19:33, Anshuman Dasgupta wrote: > > > Thanks for reviewing this. I added a top comment for AddInsnClass > and I fixed the violation of column numbers. > > Great. Looks good to me. > >