On 10/27/11 06:41 PM, Dmitry N. Mikushin wrote:
> Hello,
>
> According to google, it has been a while since last discussion about
> llvm and whirl interop. Are there any ongoing efforts in open64
> community on that? I'm tentatively interested in performing IR->whirl
> translation to target open64-supported backends. I'd also appreciate
> opinions about complexity of such task, as soon as my personal
> understanding of both representations is very rough.
Hi Dima,
1) Check google for 2 docs called whirl.pdf and symtab.pdf # This will
cover whirl, but I'm not sure of any docs for CG IR - Someone else can
chime in if such a thing exists, but it may be inline in the code.
2) LLVM IR is roughly on the same level as CG IR. If you approach it
from this perspective you can easily get a one way flow of code from
LLVM to CGIR. Check src/be/cg/whirl2ops.cxx for how VL WHIRL is lowered
to CG IR as a potential example.
--------
My personal perspective is
1) Many things about cg suck and don't use it (Tons of #if hacks,
complicated heuristics which make tuning almost a black art, possibly
outdated regalloc, scheduling could be improved and other things..)
2) If this is not Itanic related you may be interested to check out
Path64[1].
a. cmake based build system that could possibly play nice with
LLVM's cmake and is imho just flat better than Open64.
b. Better OS and ABI portability.
c. Less hacks/cleaner code if we have the targets you're interested in.
d. Much smaller codebase and easier time to use github when merging
changes back upstream
e. Community of people to help if you get stuck (Our own mailing
lists, irc, issue tracker.. etc)
If it's GPU related or you're interested in our work to fix cg ping me
off list.
Best,
Christopher
[1] Main compiler code https://github.com/path64/compiler - meta parent
package to actually build the sources
https://github.com/pathscale/path64-suite # README
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