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33 Commits

Author SHA1 Message Date
Lang Hames
3c7f6b706c Fixed a test that ensures the LocalRewriter does not attempt to 
avoid reloads by reusing clobbered registers.

This was causing issues in 256.bzip2 when compiled with PIC for
a while (starting at r78217), though the problem has since been masked. 

llvm-svn: 80872
 2009-09-03 02:52:02 +00:00
Daniel Dunbar
638e57db6e Suppress build warning in -Asserts 
llvm-svn: 79564
 2009-08-20 20:01:34 +00:00
Lang Hames
c26fb5727a Added an option to have the PBQP allocator attempt coalescing during allocation. 
llvm-svn: 79397
 2009-08-19 01:36:14 +00:00
Lang Hames
0e2ecec9f9 Changes DOUT references in the PBQP allocator to use DEBUG(errs() ...) 
llvm-svn: 79378
 2009-08-18 23:34:50 +00:00
Lang Hames
72bbdbaf85 Added RegisterCoalescer to required passes for PBQP. 
llvm-svn: 78840
 2009-08-12 21:04:53 +00:00
Dan Gohman
cea903237c Remove unnecessary throw() specifications; LLVM doesn't use exceptions. 
llvm-svn: 78667
 2009-08-11 15:35:57 +00:00
Dan Gohman
e3fa540e7a Remove unnecessary casts. 
llvm-svn: 78664
 2009-08-11 15:15:10 +00:00
Lang Hames
1503988bb5 Modified VNInfo. The "copy" member is now a union which holds the copy for a register interval, or the defining register for a stack interval. Access is via getCopy/setCopy and getReg/setReg. 
llvm-svn: 78620
 2009-08-10 23:43:28 +00:00
Owen Anderson
a15195d3c1 Remove a bunch of debugging code that was slowing PBQP down by 25% or so. 
llvm-svn: 78601
 2009-08-10 21:49:45 +00:00
Daniel Dunbar
109851c14f Fix some -Asserts unused variable warnings. 
llvm-svn: 78447
 2009-08-08 00:40:46 +00:00
Lang Hames
66ecec971d New C++ PBQP solver. Currently about as fast (read _slow_) as the old C based solver, but I'll be working to improve that. The PBQP allocator has been updated to use the new solver. 
llvm-svn: 78354
 2009-08-06 23:32:48 +00:00
Dan Gohman
4529d71681 Use setPreservesAll and setPreservesCFG in CodeGen passes. 
llvm-svn: 77754
 2009-07-31 23:37:33 +00:00
Daniel Dunbar
8496064116 More migration to raw_ostream, the water has dried up around the iostream hole. 
- Some clients which used DOUT have moved to DEBUG. We are deprecating the
   "magic" DOUT behavior which avoided calling printing functions when the
   statement was disabled. In addition to being unnecessary magic, it had the
   downside of leaving code in -Asserts builds, and of hiding potentially
   unnecessary computations.

llvm-svn: 77019
 2009-07-25 00:23:56 +00:00
Lang Hames
5c64015a56 VNInfo cleanup. 
llvm-svn: 73634
 2009-06-17 21:01:20 +00:00
Evan Cheng
1607bd1fa9 Move register allocation preference (or hint) from LiveInterval to MachineRegisterInfo. This allows more passes to set them. 
llvm-svn: 73346
 2009-06-14 20:22:55 +00:00
Bill Wendling
8235a05c1a Untabification. 
llvm-svn: 72604
 2009-05-30 01:09:53 +00:00
Lang Hames
84123bf6e8 Prevented reg0 from being added to MBB live-in set, which was causing issues 
for PostRAScheduler. 

llvm-svn: 71991
 2009-05-17 23:50:36 +00:00
Lang Hames
fcc5ebb1d4 Renamed Spiller classes (plus uses and related files) to VirtRegRewriter. 
llvm-svn: 71057
 2009-05-06 02:36:21 +00:00
Evan Cheng
28aa6c41d1 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.

llvm-svn: 70787
 2009-05-03 18:32:42 +00:00
Evan Cheng
a36c6c6819 It has finally happened. Spiller is now using live interval info. 
This fixes a very subtle bug. vr defined by an implicit_def is allowed overlap with any register since it doesn't actually modify anything. However, if it's used as a two-address use, its live range can be extended and it can be spilled. The spiller must take care not to emit a reload for the vn number that's defined by the implicit_def. This is both a correctness and performance issue.

llvm-svn: 69743
 2009-04-21 22:46:52 +00:00
Sanjiv Gupta
390dd214db r66870 missed this out. 
llvm-svn: 67082
 2009-03-17 15:46:15 +00:00
Owen Anderson
dd7e4f8c43 Convert VirtRegMap to a MachineFunctionPass. 
llvm-svn: 66870
 2009-03-13 05:55:11 +00:00
Owen Anderson
fb5980b6ab Reorganization: Move the Spiller out of VirtRegMap.cpp into its own files. No (intended) functionality change. 
llvm-svn: 66720
 2009-03-11 22:31:21 +00:00
Evan Cheng
b3c82db63d Change TargetInstrInfo::isMoveInstr to return source and destination sub-register indices as well. 
llvm-svn: 62600
 2009-01-20 19:12:24 +00:00
Misha Brukman
ae1566f744 * Moved author attribution to CREDITS.TXT 
* Removed trailing whitespace

llvm-svn: 61927
 2009-01-08 16:40:25 +00:00
Misha Brukman
cada42bb4e * Alphabetized #includes 
* Removed trailing whitespace

llvm-svn: 61926
 2009-01-08 15:50:22 +00:00
Argyrios Kyrtzidis
c7a898544b Fix compilation error on MSVC. 
llvm-svn: 59629
 2008-11-19 12:56:21 +00:00
Lang Hames
d4b67e92df Big PBQP allocator update. Adds coalescing support, stack slot coloring, several bug-fixes. 
llvm-svn: 59414
 2008-11-16 12:12:54 +00:00
Lang Hames
ed5d29fea5 Test commit. 
llvm-svn: 59293
 2008-11-14 06:51:35 +00:00
Dan Gohman
9543edc4ef Fix command-line option printing to print two spaces where needed, 
instead of requiring all "short description" strings to begin with
two spaces. This makes these strings less mysterious, and it fixes
some cases where short description strings mistakenly did not
begin with two spaces.

llvm-svn: 57521
 2008-10-14 20:25:08 +00:00
Evan Cheng
d572afd76c Fix typos pointed out by Duncan. Also untabify these files. 
llvm-svn: 57018
 2008-10-03 17:11:58 +00:00
Dan Gohman
30c5ce1b7d Switch the MachineOperand accessors back to the short names like 
isReg, etc., from isRegister, etc.

llvm-svn: 57006
 2008-10-03 15:45:36 +00:00
Evan Cheng
c589085710 A Partitioned Boolean Quadratic Programming (PBQP) based register allocator. 
Contributed by Lang Hames.

llvm-svn: 56959
 2008-10-02 18:29:27 +00:00