llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-12-16 11:30:51 +00:00

History

Devang Patel 3e15bf33e0 Use 'static const char' instead of 'static const int'. Due to darwin gcc bug, one version of darwin linker coalesces static const int, which defauts PassID based pass identification. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36652 91177308-0d34-0410-b5e6-96231b3b80d8		2007-05-02 21:39:20 +00:00
..
.cvsignore
IA64.h
IA64.td
IA64AsmPrinter.cpp	For PR1136: Rename GlobalVariable::isExternal as isDeclaration to avoid	2007-01-30 20:08:39 +00:00
IA64Bundling.cpp	Use 'static const char' instead of 'static const int'.	2007-05-02 21:39:20 +00:00
IA64InstrBuilder.h
IA64InstrFormats.td
IA64InstrInfo.cpp	Relex assertions to account for additional implicit def / use operands.	2007-04-25 07:12:14 +00:00
IA64InstrInfo.h
IA64InstrInfo.td
IA64ISelDAGToDAG.cpp	Removed tabs everywhere except autogenerated & external files. Add make	2007-04-16 18:10:23 +00:00
IA64ISelLowering.cpp	Removed tabs everywhere except autogenerated & external files. Add make	2007-04-16 18:10:23 +00:00
IA64ISelLowering.h	Finish off bug 680, allowing targets to custom lower frame and return	2007-01-29 22:58:52 +00:00
IA64MachineFunctionInfo.h
IA64RegisterInfo.cpp	eliminateFrameIndex() change.	2007-05-01 09:13:03 +00:00
IA64RegisterInfo.h	eliminateFrameIndex() change.	2007-05-01 09:13:03 +00:00
IA64RegisterInfo.td
IA64TargetAsmInfo.cpp
IA64TargetAsmInfo.h
IA64TargetMachine.cpp
IA64TargetMachine.h
Makefile
README

README

*** 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!!                 *
****************************************************************

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:

  - stop passing FP args in both FP *and* integer regs when not required
  - allocate low (nonstacked) registers more aggressively
  - 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 (hmmmm! ;)
  - 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.