forked from OSchip/llvm-project
103 lines
4.4 KiB
Plaintext
103 lines
4.4 KiB
Plaintext
*** README for the LLVM IA64 Backend "Version 0.01" - March 18, 2005
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*** Quote for this version:
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"Kaori and Hitomi are naughty!!"
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Congratulations, you have found:
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****************************************************************
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* @@@ @@@ @@@ @@@ @@@@@@@@@@ *
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* @@@ @@@ @@@ @@@ @@@@@@@@@@@ *
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* @@! @@! @@! @@@ @@! @@! @@! *
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* !@! !@! !@! @!@ !@! !@! !@! *
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* @!! @!! @!@ !@! @!! !!@ @!@ *
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* !!! !!! !@! !!! !@! ! !@! *
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* !!: !!: :!: !!: !!: !!: *
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* :!: :!: ::!!:! :!: :!: *
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* :: :::: :: :::: :::: ::: :: *
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* : :: : : : :: : : : : : *
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* *
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* *
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* @@@@@@ @@@ @@@ @@@ @@@@@@ @@@@@@ @@@ *
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* @@@@@@@@ @@@@ @@@ @@@ @@@@@@@@ @@@@@@@ @@@@ *
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* @@! @@@ @@!@!@@@ @@! @@! @@@ !@@ @@!@! *
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* !@! @!@ !@!!@!@! !@! !@! @!@ !@! !@!!@! *
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* @!@ !@! @!@ !!@! !!@ @!@!@!@! !!@@!@! @!! @!! *
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* !@! !!! !@! !!! !!! !!!@!!!! @!!@!!!! !!! !@! *
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* !!: !!! !!: !!! !!: !!: !!! !:! !:! :!!:!:!!: *
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* :!: !:! :!: !:! :!: :!: !:! :!: !:! !:::!!::: *
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* ::::: :: :: :: :: :: ::: :::: ::: ::: *
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* : : : :: : : : : : :: : : ::: *
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* *
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****************************************************************
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* Bow down, bow down, before the power of IA64! Or be crushed, *
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* be crushed, by its jolly registers of doom!! *
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****************************************************************
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DEVELOPMENT PLAN:
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_ you are 2005 maybe 2005 2006 2006 and
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/ here | | | beyond
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v v v v |
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v
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CLEAN UP ADD INSTRUCTION ADD PLAY WITH
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INSTRUCTION --> SCHEDULING AND --> JIT --> DYNAMIC --> FUTURE WORK
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SELECTION BUNDLING SUPPORT REOPTIMIZATION
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DISCLAIMER AND PROMISE:
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As of the time of this release, you are probably better off using Intel C/C++
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or GCC. The performance of the code emitted right now is, in a word,
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terrible. Check back in a few months - the story will be different then,
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I guarantee it.
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TODO:
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- clean up and thoroughly test the isel patterns.
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- fix stacked register allocation order: (for readability) we don't want
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the out? registers being the first ones used
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- fix up floating point
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(nb http://gcc.gnu.org/wiki?pagename=ia64%20floating%20point )
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- bundling!
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(we will avoid the mess that is:
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http://gcc.gnu.org/ml/gcc/2003-12/msg00832.html )
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- instruction scheduling (yep)
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- write truly inspirational documentation
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- if-conversion (predicate database/knowledge? etc etc)
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- counted loop support
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- make integer + FP mul/div more clever (we have fixed pseudocode atm)
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- track and use comparison complements
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INFO:
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- we are strictly LP64 here, no support for ILP32 on HP-UX. Linux users
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don't need to worry about this.
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- i have instruction scheduling/bundling pseudocode, that really works
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(has been tested, albeit at the perl-script level).
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so, before you go write your own, send me an email!
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KNOWN DEFECTS AT THE CURRENT TIME:
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- C++ vtables contain naked function pointers, not function descriptors,
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which is bad. see http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=406
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- varargs are broken
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- alloca doesn't work (indeed, stack frame layout is bogus)
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- no support for big-endian environments
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- (not really the backend, but...) the CFE has some issues on IA64.
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these will probably be fixed soon.
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ACKNOWLEDGEMENTS:
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- Chris Lattner (x100)
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- Other LLVM developers ("hey, that looks familiar")
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CONTACT:
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- You can email me at duraid@octopus.com.au. If you find a small bug,
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just email me. If you find a big bug, please file a bug report
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in bugzilla! http://llvm.cs.uiuc.edu is your one stop shop for all
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things LLVM.
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