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259 Commits

Author SHA1 Message Date
Owen Anderson
68f11ecb86 Remember which MachineOperand we were processing, so we don't have to scan the list to find it again later. 
This speeds up live intervals from 0.37s to 0.30s on instcombine.

llvm-svn: 52745
 2008-06-25 23:39:39 +00:00
Evan Cheng
1d07cd32c2 Undo spill weight tweak. Need to investigate the performance regressions. 
llvm-svn: 52572
 2008-06-21 06:45:54 +00:00
Owen Anderson
864a2c23ed Revert my last patch, which was causing regression test failures. 
llvm-svn: 52485
 2008-06-19 05:29:34 +00:00
Evan Cheng
968679913e Minor spiller tweak to unfavor reload into load/store instructions. 
llvm-svn: 52477
 2008-06-19 01:16:17 +00:00
Owen Anderson
abbc43e493 Insert empty slots into the instruction numbering in live intervals, so that we can more easily 
add new instructions.

llvm-svn: 52475
 2008-06-19 00:10:49 +00:00
Evan Cheng
10ead77866 Live-through live interval is [mbb start, mbb end+1]. 
llvm-svn: 52431
 2008-06-17 20:13:36 +00:00
Owen Anderson
63a604a316 Remove special case handling of empty MBBs now that we assign indices to them. 
llvm-svn: 52345
 2008-06-16 19:32:40 +00:00
Owen Anderson
3c4bb80d78 Re-enable empty block indexing by default, since it doesn't seem to have any 
impact on code quality or compile time.

llvm-svn: 52329
 2008-06-16 16:58:24 +00:00
Owen Anderson
114ce854d1 Make indexing empty basic blocks an option for the moment. 
llvm-svn: 52306
 2008-06-16 07:10:49 +00:00
Owen Anderson
1077c28bb1 Assign indices to empty basic blocks. This will be necessary for StrongPHIElimination in the near future. 
llvm-svn: 52300
 2008-06-16 06:18:41 +00:00
Evan Cheng
fe06a1fd5b Refine stack slot interval weight computation. 
llvm-svn: 52040
 2008-06-06 07:54:39 +00:00
Owen Anderson
08c0c02c20 Add a helper for constructing new live ranges that ended from an instruction to the end of its MBB. 
llvm-svn: 52012
 2008-06-05 17:15:43 +00:00
Evan Cheng
2fc7954878 Add a stack slot coloring pass. Not yet enabled. 
llvm-svn: 51934
 2008-06-04 09:18:41 +00:00
Owen Anderson
54660d1fcf Correctly handle removed instructions at the beginning of MBBs when renumbering. 
llvm-svn: 51876
 2008-06-02 17:36:36 +00:00
Owen Anderson
5ff0c098ae Make the renumbering correct in the face of deleted instructions that have been removed from the LiveIntervals maps. 
llvm-svn: 51714
 2008-05-29 23:01:22 +00:00
Bill Wendling
4a95fce74c Remove <iostream>. 
llvm-svn: 51704
 2008-05-29 21:29:39 +00:00
Owen Anderson
7de6e25492 Revert part of my last patch that I didn't intend to commit yet. 
llvm-svn: 51694
 2008-05-29 18:35:21 +00:00
Owen Anderson
9db9e1a6a4 Renumbering needs to account for instruction slot offsets when performing lookups in the index maps. 
llvm-svn: 51691
 2008-05-29 18:15:49 +00:00
Owen Anderson
219ecc1ff1 Remap VNInfo data as well when doing renumbering. 
llvm-svn: 51658
 2008-05-28 22:40:08 +00:00
Owen Anderson
705b97141c Factor the numbering computation into a separate method, and add the slightest attempt at some renumbering logic, which is currently unused. 
llvm-svn: 51652
 2008-05-28 20:54:50 +00:00
Evan Cheng
50abc2a7f1 Revert 51440 as it breaks a bunch of PIC tests. 
llvm-svn: 51513
 2008-05-23 23:00:04 +00:00
David Greene
265bbfa154 When rewriting defs and uses after spilling, don't set the weight of a 
live interval to infinity if the instruction being rewritten is an
original remat def instruction.  We were only checking against the clone
of the remat def which doesn't actually appear in the IR at all.

llvm-svn: 51440
 2008-05-22 21:16:33 +00:00
Evan Cheng
408425f0e0 Don't spill dead def. 
llvm-svn: 51305
 2008-05-20 08:10:37 +00:00
Dan Gohman
bab18cae46 Clean up the use of static and anonymous namespaces. This turned up 
several things that were neither in an anonymous namespace nor static
but not intended to be global.

llvm-svn: 51017
 2008-05-13 00:00:25 +00:00
Dan Gohman
d4a670284c Make several variable declarations static. 
llvm-svn: 50696
 2008-05-06 01:53:16 +00:00
Evan Cheng
79b92b5168 Empty basic block should have an empty range. 
llvm-svn: 49800
 2008-04-16 18:01:08 +00:00
Evan Cheng
b389b78462 Use of implicit_def is not part of live interval. Create empty intervals for the uses when the live interval is being spilled. 
llvm-svn: 49542
 2008-04-11 17:53:36 +00:00
Evan Cheng
def576f9e6 - More aggressively coalescing away copies whose source is defined by an implicit_def. 
- Added insert_subreg coalescing support.

llvm-svn: 49448
 2008-04-09 20:57:25 +00:00
Evan Cheng
6250bfbd3e - Treat a live range defined by an implicit_def as a zero-sized one. 
- Eliminate an implicit_def when it's being spilled.

llvm-svn: 49166
 2008-04-03 16:39:43 +00:00
Evan Cheng
44cdd4272c Re-materialization is for uses only. 
llvm-svn: 49053
 2008-04-01 21:37:32 +00:00
Evan Cheng
a3ce7b4c76 It's not safe to fold a load from GV stub or constantpool into a two-address use. 
llvm-svn: 49002
 2008-03-31 23:19:51 +00:00
Evan Cheng
39c43815d2 The support for remat of instructions with a register operand is hackish, to say the least. Since the register operand guaranteed to be PIC base and that it is already live at all uses, we are making sure it will not be spilled after its uses are rematerialized for both performance and correctness reasons. 
llvm-svn: 48976
 2008-03-31 07:53:30 +00:00
Evan Cheng
9af68f56c5 Remove isImplicitDef TargetInstrDesc flag. 
llvm-svn: 48381
 2008-03-15 00:19:36 +00:00
Evan Cheng
665363494f Transfer physical register spill info when load / store folding happens. 
llvm-svn: 48246
 2008-03-11 21:34:46 +00:00
Evan Cheng
af1c76846d When the register allocator runs out of registers, spill a physical register around the def's and use's of the interval being allocated to make it possible for the interval to target a register and spill it right away and restore a register for uses. This likely generates terrible code but is before than aborting. 
llvm-svn: 48218
 2008-03-11 07:19:34 +00:00
Evan Cheng
18064ddb5b Refactor code. Remove duplicated functions that basically do the same thing as 
findRegisterUseOperandIdx, findRegisterDefOperandIndx. Fix some naming inconsistencies.

llvm-svn: 47927
 2008-03-05 00:59:57 +00:00
Evan Cheng
7553230e3a Spiller now remove unused spill slots. 
llvm-svn: 47657
 2008-02-27 03:04:06 +00:00
Bill Wendling
8fb166bf6c Rename PrintableName to Name. 
llvm-svn: 47629
 2008-02-26 21:47:57 +00:00
Bill Wendling
50f5c4be14 Change "Name" to "AsmName" in the target register info. Gee, a refactoring tool 
would have been a Godsend here!

llvm-svn: 47625
 2008-02-26 21:11:01 +00:00
Evan Cheng
17c9a98b59 All remat'ed loads cannot be folded into two-address code. Not just argument loads. This change doesn't really have any impact on codegen. 
llvm-svn: 47557
 2008-02-25 19:24:01 +00:00
Evan Cheng
fc540545f1 Correctly determine whether a argument load can be folded into its uses. 
llvm-svn: 47545
 2008-02-25 08:50:41 +00:00
Evan Cheng
d299f09bc5 Rematerialization logic was overly conservative when it comes to loads from fixed stack slots. 
llvm-svn: 47529
 2008-02-23 03:38:34 +00:00
Evan Cheng
2de70b3ff8 If remating a machine instr with virtual register operand, make sure the vr is avaliable at all uses regardless of whether it would be folded. 
llvm-svn: 47526
 2008-02-23 02:14:42 +00:00
Evan Cheng
95d3cb841d Recognize loads of arguments as re-materializable first. Therefore if isReallyTriviallyReMaterializable() returns true it doesn't confuse it as a "normal" re-materializable instruction. 
llvm-svn: 47520
 2008-02-23 01:44:27 +00:00
Evan Cheng
166cb23f62 Fix spill weight updating bug. 
llvm-svn: 47507
 2008-02-23 00:33:04 +00:00
Evan Cheng
fa73e0c64e Enable re-materialization of instructions which have virtual register operands if 
the definition of the operand also reaches its uses.

llvm-svn: 47475
 2008-02-22 09:24:50 +00:00
Evan Cheng
f58113f597 Clean up some spilling code using MachineRegisterInfo. 
llvm-svn: 47416
 2008-02-21 00:34:19 +00:00
Roman Levenstein
a7d4ae1435 New helper function getMBBFromIndex() that given an index in any instruction of an MBB returns a pointer the MBB. Reviewed by Evan. 
llvm-svn: 47267
 2008-02-18 09:35:30 +00:00
Evan Cheng
bb357cd8a6 - Removing the infamous r2rMap_ and rep() method. Now the coalescer will update 
register defs and uses after each successful coalescing.
- Also removed a number of hacks and fixed some subtle kill information bugs.

llvm-svn: 47167
 2008-02-15 18:24:29 +00:00
Evan Cheng
0e4d4f17cc Fix a potential serious problem where kills belonging to the val# defined by a two-address instruction is also on the val# that defines the input. 
llvm-svn: 47057
 2008-02-13 09:06:18 +00:00