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56 Commits

Author SHA1 Message Date
Owen Anderson
bf77d2eb9d Correct the algorithms for choosing spill and restore points so that we don't try to insert loads/stores between call frame setup and the actual call. 
This fixes the last known failure for the pre-alloc-splitter.

llvm-svn: 63339
 2009-01-29 22:13:06 +00:00
Owen Anderson
c0924a0632 Fix an issue where restores could be inserted after a terminator instruction, 
and an iterator invalidation issue.

FreeBench/pifft no longer miscompiles with these fixes!

llvm-svn: 63293
 2009-01-29 08:22:06 +00:00
Owen Anderson
a590802ed6 Comments are good. :-) 
llvm-svn: 63276
 2009-01-29 05:41:02 +00:00
Owen Anderson
b05ce78c51 Add support for aggressive load-use-store folding. This takes care of the 
vast majority of code size regressions introduced by pre-alloc-splitting.

llvm-svn: 63274
 2009-01-29 05:28:55 +00:00
Owen Anderson
431053ed2c Make the pre-split-limit option more useful by using a per-function counter. 
llvm-svn: 63091
 2009-01-27 05:01:15 +00:00
Owen Anderson
e84c3f261e Reapply r63025 and r63026, with fixes for the failing testcases. 
llvm-svn: 63049
 2009-01-26 21:57:31 +00:00
Bill Wendling
e7fa3c37c6 Also revert r63206 
llvm-svn: 63041
 2009-01-26 21:30:17 +00:00
Bill Wendling
a39c83d118 Temporarily revert r63025 until the testsuite failures can be fixed. 
llvm-svn: 63040
 2009-01-26 21:27:03 +00:00
Owen Anderson
5e235d3a7e Get rid of a bunch of dead code now that interval reconstruction is enabled. 
llvm-svn: 63026
 2009-01-26 19:18:06 +00:00
Owen Anderson
feffdec244 Fix an issue where LiveIntervals was trying to be smart about removing kill 
markers, and ended up foiling the interval reconstruction.

This allows us to turn on reconstruction in the pre alloc splitter, which
fixes a number of miscompilations.

llvm-svn: 63025
 2009-01-26 19:12:06 +00:00
Evan Cheng
72287a599f Silence a bogus compiler warning. 
llvm-svn: 63021
 2009-01-26 18:33:51 +00:00
Owen Anderson
ee34b8f179 Some cleanups. No functional changes. 
llvm-svn: 62917
 2009-01-24 10:07:43 +00:00
Owen Anderson
a2ca64a39a Stage two of fixing pre-alloc-splitting's code size issues: filter out restores that are just 
going to be re-spilled again.

This also helps performance.  Pre-alloc-splitting now seems to be an overall win on SPEC.

llvm-svn: 62834
 2009-01-23 03:28:53 +00:00
Owen Anderson
48abf2380b Add an initial pass at dead spill/restore removal for pre alloc splitting. 
llvm-svn: 62821
 2009-01-23 00:23:32 +00:00
Owen Anderson
fe48dfa0f2 I accidentally removed this check in an earlier commit, which cause breakage in the pre alloc splitter. 
llvm-svn: 62678
 2009-01-21 08:18:03 +00:00
Owen Anderson
be7a29de0b Be more aggressive about renumbering vregs after splitting them. 
llvm-svn: 62639
 2009-01-21 00:13:28 +00:00
Evan Cheng
c544cb0eca Change TargetInstrInfo::isMoveInstr to return source and destination sub-register indices as well. 
llvm-svn: 62600
 2009-01-20 19:12:24 +00:00
Owen Anderson
45cfef2cb6 More two-address fixes. This gets lua working with join-creation enabled. 
llvm-svn: 62073
 2009-01-12 03:10:40 +00:00
Owen Anderson
f04100a50d The phi construction algorithm used for interval reconstruction is complicated by 
two address instructions.  We need to keep track of things we've processed AS USES
independetly of whether we've processed them as defs.

This fixes all known miscompilations when reconstruction is turned on.

llvm-svn: 61802
 2009-01-06 07:53:32 +00:00
Owen Anderson
96fce00dc0 Get rid of sentinel insertion in interval reconstruction. It just masked the 
problem, rather than fixing it.  The problem has now been fixed the right way.

llvm-svn: 61723
 2009-01-05 18:32:26 +00:00
Owen Anderson
8b86b9ca47 Get live interval reconstruction several steps closer to working. 
llvm-svn: 61514
 2008-12-31 02:00:25 +00:00
Duncan Sands
43b18241ff Add braces, as suggested by a gcc warning. 
llvm-svn: 61465
 2008-12-29 08:05:02 +00:00
Owen Anderson
b5232286a7 Fix up kill/dead marking in the new live interval reconstruction code. 
llvm-svn: 61460
 2008-12-28 23:35:13 +00:00
Owen Anderson
37751bb9d9 Add prototype code for recomputing a live interval's ranges and valnos through recursive phi construction. 
llvm-svn: 61458
 2008-12-28 21:48:48 +00:00
Owen Anderson
ad4d2ab15b Re-apply r61158 in a form that no longer breaks tests. 
llvm-svn: 61182
 2008-12-18 01:27:19 +00:00
Owen Anderson
59727c0496 Revert r61158 for now, as it caused some test failures. 
llvm-svn: 61159
 2008-12-17 22:17:27 +00:00
Owen Anderson
9389176009 Fix miscompilations caused by renumbering, and enable it as part of prealloc splitting. 
llvm-svn: 61158
 2008-12-17 22:06:59 +00:00
Owen Anderson
5121ec3821 Add code to renumber split intervals into new vregs. This is disabled for now until I finish working out some iterator invalidation issues. 
llvm-svn: 61104
 2008-12-16 21:35:08 +00:00
Owen Anderson
12679470bf 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
0bcbe8f6a8 Factor out some common code. 
llvm-svn: 60553
 2008-12-04 21:20:30 +00:00
Owen Anderson
ecd5b5f2b2 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
1af37c2fca Add support for rematerialization in pre-alloc-splitting. 
llvm-svn: 59587
 2008-11-19 04:28:29 +00:00
Owen Anderson
896512af94 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
d36b4c1bf8 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
fd395eb801 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
26c10f1b4a 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
a926ed4b50 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
b067843863 Revert my last patch until I consult with Evan about it. 
llvm-svn: 58591
 2008-11-03 02:33:28 +00:00
Owen Anderson
2bb2aaa775 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
d1f8c9f4a2 Add a fixme. 
llvm-svn: 58514
 2008-10-31 16:41:59 +00:00
Evan Cheng
ce3ccc1ea0 - 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
938e201528 - 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
5e88d90379 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
9f854697e4 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
fab31680e1 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
e67ad47a00 Silence a bogus compile time warning. 
llvm-svn: 58297
 2008-10-27 23:29:28 +00:00
Evan Cheng
f46642ada6 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
f713722975 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
ed033ede22 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
f48367b8e9 Handle cases where there aren't uses in the barrier mbb. 
llvm-svn: 58174
 2008-10-25 23:49:39 +00:00