| *** README for the LLVM IA64 Backend "Version 0.01" - March 18, 2005 |
| *** 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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| * 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: |
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| _ 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: |
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| 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. |
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| ACKNOWLEDGEMENTS: |
| |
| - Chris Lattner (x100) |
| - Other LLVM developers ("hey, that looks familiar") |
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| 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. |
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| |
