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28 Commits

Author SHA1 Message Date
Owen Anderson
a5f2ce1ee3 Switch to top-down mode and fix a crasher this exposed caused by an error in the 
live interval updating.

llvm-svn: 60652
 2008-12-07 05:33:18 +00:00
Owen Anderson
9e2293bda3 Factor out some common code. 
llvm-svn: 60553
 2008-12-04 21:20:30 +00:00
Owen Anderson
afbd11e227 Add support for folding spills into preceding defs when doing pre-alloc splitting. 
llvm-svn: 60433
 2008-12-02 18:53:47 +00:00
Owen Anderson
482ea64f7b Add support for rematerialization in pre-alloc-splitting. 
llvm-svn: 59587
 2008-11-19 04:28:29 +00:00
Owen Anderson
57a8a95293 Fix a bug introduced by my previous patch. With this change, SPEC is now clean with prealloc splitting enabled. 
llvm-svn: 59544
 2008-11-18 20:53:59 +00:00
Owen Anderson
aa9f1836d9 Don't allow the restore point to be placed after terminators. With this change, 
MultiSource/Applications is clean with the prealloc splitter.  Some failures
remain in SPEC.

llvm-svn: 59267
 2008-11-13 21:53:14 +00:00
Owen Anderson
3ef1e1ff3f Don't walk into predecessors in which the vreg is not live when doing shrinkwrapping. 
This lets several failing tests get farther along, but doesn't completely fix any of them.

llvm-svn: 59086
 2008-11-11 22:11:27 +00:00
Owen Anderson
df29b0d7b2 Use the new predicate to control when we do prealloc splitting. Fix a small bug. 
llvm-svn: 58738
 2008-11-05 00:32:13 +00:00
Owen Anderson
2ed3bc9016 First pass at checking for the creation of a new join point when doing pre-alloc splitting. This is not turned on yet. 
llvm-svn: 58726
 2008-11-04 22:22:41 +00:00
Owen Anderson
6d82fd0e8e Revert my last patch until I consult with Evan about it. 
llvm-svn: 58591
 2008-11-03 02:33:28 +00:00
Owen Anderson
146d114669 Don't do pre-splitting if doing so would create a value join that did not 
exist before.  Updating the live intervals in that care is tricky in the general
case.

Evan, if you see a tighter guard condition for this, let me know.

llvm-svn: 58560
 2008-11-02 08:08:18 +00:00
Evan Cheng
d3b31c4fe1 Add a fixme. 
llvm-svn: 58514
 2008-10-31 16:41:59 +00:00
Evan Cheng
6125b9e097 - More pre-split fixes: spill slot live interval computation bug; restore point bug. 
- If a def is spilt, remember its spill index to allow its reuse.

llvm-svn: 58375
 2008-10-29 08:39:34 +00:00
Evan Cheng
cd21d433bb - Rewrite code that update register live interval that's split. 
- Create and update spill slot live intervals.
- Lots of bug fixes.

llvm-svn: 58367
 2008-10-29 05:06:14 +00:00
Evan Cheng
8f9bfa5bff If def is in the same mbb as the barrier, spilt the value after the last use before the barrier. 
llvm-svn: 58314
 2008-10-28 05:28:21 +00:00
Evan Cheng
6242a4f47b Add command line option to limit the number splits to help debugging. 
llvm-svn: 58312
 2008-10-28 01:48:24 +00:00
Evan Cheng
9bbf76a1e9 Avoid putting a split past the end of the live range; always shrink wrap live interval in the barrier mbb. 
llvm-svn: 58309
 2008-10-28 00:47:49 +00:00
Evan Cheng
420490d6c4 Silence a bogus compile time warning. 
llvm-svn: 58297
 2008-10-27 23:29:28 +00:00
Evan Cheng
056ef89e68 Remove val# defined by a remat'ed def that is now dead. 
llvm-svn: 58294
 2008-10-27 23:21:01 +00:00
Evan Cheng
3bcbccf563 For now, don't split live intervals around x87 stack register barriers. FpGET_ST0_80 must be right after a call instruction (and ADJCALLSTACKUP) so we need to find a way to prevent reload of x87 registers between them. 
llvm-svn: 58230
 2008-10-27 07:14:50 +00:00
Evan Cheng
8a7f04e7c2 Do not shrink wrap live interval in a mbb if it's livein any of its successor blocks. The mbb can be revisited again after all of the successors are processed. 
llvm-svn: 58184
 2008-10-26 07:49:03 +00:00
Evan Cheng
db1c135283 Handle cases where there aren't uses in the barrier mbb. 
llvm-svn: 58174
 2008-10-25 23:49:39 +00:00
Evan Cheng
0c78ace7dc If val# def is ~0U, meaning it's defined by a PHI, and it's previously split, spill before the barrier because it's impossible to determine if all the defs are spilled in the same spill slot. 
llvm-svn: 58129
 2008-10-25 00:52:41 +00:00
Evan Cheng
cfd2ecd29f Fix a pasto. 
llvm-svn: 58102
 2008-10-24 18:46:44 +00:00
Evan Cheng
efb8edb805 Fix a end() dereference; remove an abort() that wasn't meant to be left in. 
llvm-svn: 58072
 2008-10-24 05:53:44 +00:00
Evan Cheng
a7a0aabf99 Avoid splitting an interval multiple times; avoid splitting re-materializable val# (for now). 
llvm-svn: 58068
 2008-10-24 02:05:00 +00:00
Evan Cheng
c906d4938e Committing a good chunk of the pre-register allocation live interval splitting pass. It's handling simple cases and appear to do good things. Next: avoid splitting an interval multiple times; renumber registers when possible; record stack slot live intervals for coloring; rematerialize defs when possible. 
llvm-svn: 58044
 2008-10-23 20:43:13 +00:00
Evan Cheng
1bc92a1aa6 Add skeleton for the pre-register allocation live interval splitting pass. 
llvm-svn: 57847
 2008-10-20 21:44:59 +00:00