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70 Commits

Author SHA1 Message Date
Evan Cheng
c781a243a3 In some rare cases, the register allocator can spill registers but end up not utilizing registers at all. The fundamental problem is linearscan's backtracking can end up freeing more than one allocated registers. However, reloads and restores might be folded into uses / defs and freed registers might not be used at all. 
VirtRegMap keeps track of allocations so it knows what's not used. As a horrible hack, the stack coloring can color spill slots with *free* registers. That is, it replace reload and spills with copies from and to the free register. It unfold instructions that load and store the spill slot and replace them with register using variants.

Not yet enabled. This is part 1. More coming.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70787 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-05-03 18:32:42 +00:00
Bob Wilson
d9df501704 Fix pr3954. The register scavenger asserts for inline assembly with 
register destinations that are tied to source operands.  The
TargetInstrDescr::findTiedToSrcOperand method silently fails for inline
assembly.  The existing MachineInstr::isRegReDefinedByTwoAddr was very
close to doing what is needed, so this revision makes a few changes to
that method and also renames it to isRegTiedToUseOperand (for consistency
with the very similar isRegTiedToDefOperand and because it handles both
two-address instructions and inline assembly with tied registers).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68714 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-04-09 17:16:43 +00:00
Owen Anderson
696a1307ba Remove the "fast" cases for spill and restore point determination, as these were subtlely wrong in obscure cases. Patch the testcase 
to account for this change.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68093 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-03-31 08:27:09 +00:00
Owen Anderson
420dd37326 Give the pre-alloc splitter access to the VirtRegMap. It doesn't do anything 
useful with it at the moment, but it will in the future.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67012 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-03-14 21:40:05 +00:00
Owen Anderson
a2bfb54e4d (Hopefully) silence a warning. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66158 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-03-05 08:23:20 +00:00
Owen Anderson
323c58d862 Be more careful about choosing restore points when doing restore folding. This fixes some subtle miscompilations. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66147 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-03-05 07:19:18 +00:00
Owen Anderson
c93023a89e Add a restore folder, which shaves a dozen or so machineinstrs off oggenc. Update a testcase to check this. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66029 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-03-04 08:52:31 +00:00
Owen Anderson
4cafbb58e2 Fix a crash in the pre-alloc splitter exposed by recent codegen changes. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65121 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-02-20 10:02:23 +00:00
Evan Cheng
4350eb86a7 Add TargetInstrInfo::isSafeToMoveRegisterClassDefs. It returns true if it's safe to move an instruction which defines a value in the register class. Replace pre-splitting specific IgnoreRegisterClassBarriers with this new hook. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63936 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-02-06 17:17:30 +00:00
Owen Anderson
5734c94ec2 Pre-alloc splitting needs to be more careful to avoid inserting spills/restores 
between call frame setup/restore points.  Unfortunately, this regresses 
code size a bit, but at least it's correct now!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63837 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-02-05 05:58:41 +00:00
Owen Anderson
5b93f6fa82 MergeValueInto is too smart: it might choose to do the merge the opposite direction. 
Live interval reconstruction needs to account for this, and scour its maps to
prevent dangling references.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63558 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-02-02 22:42:01 +00:00
Evan Cheng
19a725851d Refactor PerformPHIConstruction, no functionality changes. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63536 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-02-02 18:33:18 +00:00
Owen Anderson
4a6d13e8fb Fix test failures causes by my previous commit. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63492 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-02-01 08:41:54 +00:00
Owen Anderson
5caedc0f09 Fix an issue in PHI construction that was exposed by GCC 4.2 producing a different set iteration order for the reg_iterator. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63490 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-02-01 07:06:00 +00:00
Owen Anderson
3ef4549d9d 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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63339 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-01-29 22:13:06 +00:00
Owen Anderson
c0f3a0353c 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!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63293 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-01-29 08:22:06 +00:00
Owen Anderson
4bfc209721 Comments are good. :-) 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63276 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-01-29 05:41:02 +00:00
Owen Anderson
45e6855ea2 Add support for aggressive load-use-store folding. This takes care of the 
vast majority of code size regressions introduced by pre-alloc-splitting.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63274 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-01-29 05:28:55 +00:00
Owen Anderson
26562de2ef Make the pre-split-limit option more useful by using a per-function counter. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63091 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-01-27 05:01:15 +00:00
Owen Anderson
b4b8436381 Reapply r63025 and r63026, with fixes for the failing testcases. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63049 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-01-26 21:57:31 +00:00
Bill Wendling
826f093517 Also revert r63206 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63041 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-01-26 21:30:17 +00:00
Bill Wendling
34b946b8fb Temporarily revert r63025 until the testsuite failures can be fixed. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63040 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-01-26 21:27:03 +00:00
Owen Anderson
d7250517b0 Get rid of a bunch of dead code now that interval reconstruction is enabled. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63026 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-01-26 19:18:06 +00:00
Owen Anderson
8af1e761f8 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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63025 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-01-26 19:12:06 +00:00
Evan Cheng
b964f33873 Silence a bogus compiler warning. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63021 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-01-26 18:33:51 +00:00
Owen Anderson
32ca8657b8 Some cleanups. No functional changes. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62917 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-01-24 10:07:43 +00:00
Owen Anderson
9ce499ab36 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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62834 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-01-23 03:28:53 +00:00
Owen Anderson
956ec27a99 Add an initial pass at dead spill/restore removal for pre alloc splitting. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62821 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-01-23 00:23:32 +00:00
Owen Anderson
d3be46214c I accidentally removed this check in an earlier commit, which cause breakage in the pre alloc splitter. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62678 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-01-21 08:18:03 +00:00
Owen Anderson
6cf7c390ec Be more aggressive about renumbering vregs after splitting them. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62639 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-01-21 00:13:28 +00:00
Evan Cheng
04ee5a1d92 Change TargetInstrInfo::isMoveInstr to return source and destination sub-register indices as well. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62600 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-01-20 19:12:24 +00:00
Owen Anderson
e1762c9826 More two-address fixes. This gets lua working with join-creation enabled. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62073 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-01-12 03:10:40 +00:00
Owen Anderson
200ee7f521 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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61802 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-01-06 07:53:32 +00:00
Owen Anderson
d0ed240e30 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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61723 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-01-05 18:32:26 +00:00
Owen Anderson
7d211e299f Get live interval reconstruction several steps closer to working. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61514 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-12-31 02:00:25 +00:00
Duncan Sands
2b7fc1ef53 Add braces, as suggested by a gcc warning. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61465 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-12-29 08:05:02 +00:00
Owen Anderson
d4f6fe55eb Fix up kill/dead marking in the new live interval reconstruction code. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61460 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-12-28 23:35:13 +00:00
Owen Anderson
60d4f6ded2 Add prototype code for recomputing a live interval's ranges and valnos through recursive phi construction. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61458 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-12-28 21:48:48 +00:00
Owen Anderson
2ebf63f8e2 Re-apply r61158 in a form that no longer breaks tests. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61182 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-12-18 01:27:19 +00:00
Owen Anderson
c7a21941c5 Revert r61158 for now, as it caused some test failures. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61159 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-12-17 22:17:27 +00:00
Owen Anderson
25dffa743b Fix miscompilations caused by renumbering, and enable it as part of prealloc splitting. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61158 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-12-17 22:06:59 +00:00
Owen Anderson
d0b6a0d967 Add code to renumber split intervals into new vregs. This is disabled for now until I finish working out some iterator invalidation issues. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61104 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-12-16 21:35:08 +00:00
Owen Anderson
75c99c5aa8 Switch to top-down mode and fix a crasher this exposed caused by an error in the 
live interval updating.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60652 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-12-07 05:33:18 +00:00
Owen Anderson
6002e993e0 Factor out some common code. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60553 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-12-04 21:20:30 +00:00
Owen Anderson
7b9d67c5bf Add support for folding spills into preceding defs when doing pre-alloc splitting. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60433 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-12-02 18:53:47 +00:00
Owen Anderson
75fa96bb71 Add support for rematerialization in pre-alloc-splitting. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59587 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-19 04:28:29 +00:00
Owen Anderson
5a92d4e657 Fix a bug introduced by my previous patch. With this change, SPEC is now clean with prealloc splitting enabled. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59544 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-18 20:53:59 +00:00
Owen Anderson
711fd3db2d 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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59267 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-13 21:53:14 +00:00
Owen Anderson
80fe8737eb 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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59086 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-11 22:11:27 +00:00
Owen Anderson
b214c6971b Use the new predicate to control when we do prealloc splitting. Fix a small bug. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58738 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-05 00:32:13 +00:00