mirror of
https://github.com/c64scene-ar/llvm-6502.git
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5839bf2b3b
putting it into the constant pool. This allows the isel machinery to create constants that it will end up deciding are not needed, without them ending up in the resultant function constant pool. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23081 91177308-0d34-0410-b5e6-96231b3b80d8
*** README for the LLVM IA64 Backend "Version 0.01" - March 18, 2005
*** Quote for this version:
"Kaori and Hitomi are naughty!!"
Congratulations, you have found:
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* Bow down, bow down, before the power of IA64! Or be crushed, *
* be crushed, by its jolly registers of doom!! *
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DEVELOPMENT PLAN:
_ you are 2005 maybe 2005 2006 2006 and
/ here | | | beyond
v v v v |
v
CLEAN UP ADD INSTRUCTION ADD PLAY WITH
INSTRUCTION --> SCHEDULING AND --> JIT --> DYNAMIC --> FUTURE WORK
SELECTION BUNDLING SUPPORT REOPTIMIZATION
DISCLAIMER AND PROMISE:
As of the time of this release, you are probably better off using Intel C/C++
or GCC. The performance of the code emitted right now is, in a word,
terrible. Check back in a few months - the story will be different then,
I guarantee it.
TODO:
- clean up and thoroughly test the isel patterns.
- fix stacked register allocation order: (for readability) we don't want
the out? registers being the first ones used
- fix up floating point
(nb http://gcc.gnu.org/wiki?pagename=ia64%20floating%20point )
- bundling!
(we will avoid the mess that is:
http://gcc.gnu.org/ml/gcc/2003-12/msg00832.html )
- instruction scheduling (yep)
- write truly inspirational documentation
- if-conversion (predicate database/knowledge? etc etc)
- counted loop support
- make integer + FP mul/div more clever (we have fixed pseudocode atm)
- track and use comparison complements
INFO:
- we are strictly LP64 here, no support for ILP32 on HP-UX. Linux users
don't need to worry about this.
- i have instruction scheduling/bundling pseudocode, that really works
(has been tested, albeit at the perl-script level).
so, before you go write your own, send me an email!
KNOWN DEFECTS AT THE CURRENT TIME:
- C++ vtables contain naked function pointers, not function descriptors,
which is bad. see http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=406
- varargs are broken
- alloca doesn't work (indeed, stack frame layout is bogus)
- no support for big-endian environments
- (not really the backend, but...) the CFE has some issues on IA64.
these will probably be fixed soon.
ACKNOWLEDGEMENTS:
- Chris Lattner (x100)
- Other LLVM developers ("hey, that looks familiar")
CONTACT:
- You can email me at duraid@octopus.com.au. If you find a small bug,
just email me. If you find a big bug, please file a bug report
in bugzilla! http://llvm.cs.uiuc.edu is your one stop shop for all
things LLVM.