search for: regallocgraphcoloring

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

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 documentation anywhere. Does > it work? Hi! I work on implementing of optimistic graph coloring algorithm (by Preston Briggs) for LLVM. I didn't mentioned it on this list dir...

.... Fernando > 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 documentation anywhere. Does >> it work? > > > Hi! > > I work on implementing of optimistic graph coloring algorithm (by Preston > Briggs) for LLVM. I d...

David Greene wrote: > 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? Ah, ok. One of our folks here grabbed it off the mailing list and put it in our local repository. Still, what's the status of this thi...

On 4/3/07, David Greene <greened at obbligato.org> wrote: > David Greene wrote: > > > 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? > > Ah, ok. One of our folks here grabbed it off the mailing > list and put it in our local repository. > > St...

Quoting Bill Wendling <isanbard at gmail.com>: > Hi Nikolaos, > > I have an alpha version of Chow & Hennesey's priority-based graph > coloring algorithm. It's suffering from some bit-rotting -- e.g., > there's some trouble with how it calculates "forbidden" registers. > You're welcome to the code, if you'd like to hack on it. I've been

...; 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 > > sources? It seems to be the Fred Chow algorithm but > > it's not mentioned in the documentation anywhere. Does > > it work? > > > Hi! > > I work on implementing of optimistic graph coloring algorithm (by > Preston > Briggs) fo...

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 * Folding spill code into instructions, handling register coallescing, splitting live ranges, doing

...f LiveIntervals::runOnMachineFunction replaces operand registers with using rep() which makes use of r2rMap_. So why does LiveIntervals::CreateNewLiveInterval use r2rMap_? Actually, in the official sources, this member is not used by anyone according to the Doxygen pages. The only use I see is in RegAllocGraphColoring.cpp which was posted to the mailing list some time ago. So I have several questions: - Does this refactoring sound like a good idea? Would a patch be accepted? - Is my plan to separate spill cost calculation from coalescing sound? - Where do I send patches for approval? - What is LiveInter...

...for your teaching! >> >> I am a newbie in compiler area, I only learned Compiler Principle in >> 2002https://www.leetcode.cn/2017/12/ilove-compiler-principle.html >> >> But I like to practice and learn >> :)https://github.com/xiangzhai/llvm/blob/avr/lib/CodeGen/RegAllocGraphColoring.cpp#L327because >> theory is not always correct, or misunderstood by people, so I want >> to compare solutionByHEA, IRA, Greedy, PBQP and other algorithms. > > Just as another tip: > - Indeed in my experience: Just implementing some algorithms yourself > and comparing the...

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