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llvm-6502/lib/Target/IA64
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Nate Begeman 391c5d231a No longer track value types for asm printer operands, and remove them as 
an argument to every operand printing function.  Requires some slight
tweaks to x86, the only user.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24541 91177308-0d34-0410-b5e6-96231b3b80d8
2005-11-30 18:54:35 +00:00
..
.cvsignore
IA64.h DAG->DAG instruction selection for ia64! "hello world" works, not much else. 2005-10-28 17:46:35 +00:00
IA64.td these registers don't belong to any register classes, so don't mark them 2005-09-30 06:42:24 +00:00
IA64AsmPrinter.cpp No longer track value types for asm printer operands, and remove them as 2005-11-30 18:54:35 +00:00
IA64InstrBuilder.h
IA64InstrFormats.td add FP compares and implicit register defs to the dag isel 2005-10-31 01:42:11 +00:00
IA64InstrInfo.cpp
IA64InstrInfo.h
IA64InstrInfo.td add FP select. next up - divide! 2005-11-14 01:17:30 +00:00
IA64ISelDAGToDAG.cpp add support for dynamic_stackalloc to the dag isel (thanks andrew ;) 2005-11-25 07:49:25 +00:00
IA64ISelLowering.cpp No targets support line number info yet. 2005-11-29 06:16:21 +00:00
IA64ISelLowering.h DAG->DAG instruction selection for ia64! "hello world" works, not much else. 2005-10-28 17:46:35 +00:00
IA64ISelPattern.cpp DAG->DAG instruction selection for ia64! "hello world" works, not much else. 2005-10-28 17:46:35 +00:00
IA64MachineFunctionInfo.h
IA64RegisterInfo.cpp remove dead stuff 2005-10-28 04:58:24 +00:00
IA64RegisterInfo.h
IA64RegisterInfo.td add F0 and F1 to the FP register class 2005-11-02 07:30:39 +00:00
IA64TargetMachine.cpp Add a new option to indicate we want the code generator to emit code quickly,not spending tons of time microoptimizing it. This is useful for an -O0style of build. 2005-11-08 02:11:51 +00:00
IA64TargetMachine.h Add a new option to indicate we want the code generator to emit code quickly,not spending tons of time microoptimizing it. This is useful for an -O0style of build. 2005-11-08 02:11:51 +00:00
Makefile DAG->DAG instruction selection for ia64! "hello world" works, not much else. 2005-10-28 17:46:35 +00:00
README heh, scheduling was easy? 2005-11-01 05:49:08 +00:00

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:

**************************************************************** 
* @@@       @@@       @@@  @@@  @@@@@@@@@@                     *
* @@@       @@@       @@@  @@@  @@@@@@@@@@@                    *
* @@!       @@!       @@!  @@@  @@! @@! @@!                    *
* !@!       !@!       !@!  @!@  !@! !@! !@!                    *
* @!!       @!!       @!@  !@!  @!! !!@ @!@                    *
* !!!       !!!       !@!  !!!  !@!   ! !@!                    *
* !!:       !!:       :!:  !!:  !!:     !!:                    *
*  :!:       :!:       ::!!:!   :!:     :!:                    *
*  :: ::::   :: ::::    ::::    :::     ::                     *
* : :: : :  : :: : :     :       :      :                      *
*                                                              *
*                                                              *
*  @@@@@@   @@@  @@@       @@@   @@@@@@     @@@@@@       @@@   *
* @@@@@@@@  @@@@ @@@       @@@  @@@@@@@@   @@@@@@@      @@@@   *
* @@!  @@@  @@!@!@@@       @@!  @@!  @@@  !@@          @@!@!   *
* !@!  @!@  !@!!@!@!       !@!  !@!  @!@  !@!         !@!!@!   *
* @!@  !@!  @!@ !!@!       !!@  @!@!@!@!  !!@@!@!    @!! @!!   *
* !@!  !!!  !@!  !!!       !!!  !!!@!!!!  @!!@!!!!  !!!  !@!   *
* !!:  !!!  !!:  !!!       !!:  !!:  !!!  !:!  !:!  :!!:!:!!:  *
* :!:  !:!  :!:  !:!       :!:  :!:  !:!  :!:  !:!  !:::!!:::  *
* ::::: ::   ::   ::        ::  ::   :::  :::: :::       :::   *
*  : :  :   ::    :        :     :   : :   :: : :        :::   *
*                                                              *
****************************************************************
* 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.