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41 Commits

Author SHA1 Message Date
Owen Anderson 7fe0bb2b43 Fix an iterator invalidation issue. 
llvm-svn: 46263
 2008-01-22 23:58:54 +00:00
Owen Anderson 7fb6241733 Clarify a deviation from the original algorithm. 
llvm-svn: 46218
 2008-01-21 22:03:00 +00:00
Owen Anderson d990b4f646 Improve a few comments. 
llvm-svn: 46217
 2008-01-21 22:01:01 +00:00
Owen Anderson 4f45cef2f9 Get rid of all uses of LiveVariables::VarInfo::DefInst in favor of the equivalent API from 
MachineRegisterInfo.  Once all clients are switched over, the former will be going away.

llvm-svn: 45805
 2008-01-10 01:36:43 +00:00
Owen Anderson 51b8e20ccf Add more comments explaining the basics of how the decision of when to rename and when to insert 
copies is made.

llvm-svn: 45799
 2008-01-10 00:47:01 +00:00
Owen Anderson 8958a78576 Get rid of the isKillInst predicate. LiveVariables already provides this information. 
llvm-svn: 45797
 2008-01-10 00:33:11 +00:00
Owen Anderson 1c8152ba03 Copies need to be inserted before the first terminator, not at the end of the block. 
llvm-svn: 45791
 2008-01-10 00:01:41 +00:00
Owen Anderson 436db42a3c Clean up StrongPHIElimination a bit, and add some more comments to the internal structures. There's 
still more work to do on this front.

llvm-svn: 45783
 2008-01-09 22:40:54 +00:00
Owen Anderson 4de0c3978d StrongPHIElim: Now with even fewer trivial bugs! 
llvm-svn: 45775
 2008-01-09 10:41:39 +00:00
Owen Anderson 77c3fe441b Fix an infinite recursion bug in InsertCopies. 
llvm-svn: 45774
 2008-01-09 10:32:30 +00:00
Owen Anderson e0fd9bd35a Fix some simple bugs. StrongPHIElimination now does not crash on 164.gzip. 
llvm-svn: 45773
 2008-01-09 06:19:05 +00:00
Owen Anderson 1b0d5c747e Rename registers that do not need copies. 
llvm-svn: 45759
 2008-01-08 21:54:52 +00:00
Owen Anderson 812e1ea7cf Actually insert copies now! 
llvm-svn: 45738
 2008-01-08 05:16:15 +00:00
Owen Anderson 47299489ec Oops, missed one. 
llvm-svn: 45719
 2008-01-07 21:32:09 +00:00
Owen Anderson bbc6352d1f Make some predicates static. 
llvm-svn: 45718
 2008-01-07 21:30:40 +00:00
Chris Lattner a10fff51d9 Rename SSARegMap -> MachineRegisterInfo in keeping with the idea 
that "machine" classes are used to represent the current state of
the code being compiled.  Given this expanded name, we can start 
moving other stuff into it.  For now, move the UsedPhysRegs and
LiveIn/LoveOuts vectors from MachineFunction into it.

Update all the clients to match.

This also reduces some needless #includes, such as MachineModuleInfo
from MachineFunction.

llvm-svn: 45467
 2007-12-31 04:13:23 +00:00
Chris Lattner a5bb370aa4 Add new shorter predicates for testing machine operands for various types: 
e.g. MO.isMBB() instead of MO.isMachineBasicBlock().  I don't plan on 
switching everything over, so new clients should just start using the 
shorter names.

Remove old long accessors, switching everything over to use the short
accessor: getMachineBasicBlock() -> getMBB(), 
getConstantPoolIndex() -> getIndex(), setMachineBasicBlock -> setMBB(), etc.

llvm-svn: 45464
 2007-12-30 23:10:15 +00:00
Chris Lattner f3ebc3f3d2 Remove attribution from file headers, per discussion on llvmdev. 
llvm-svn: 45418
 2007-12-29 20:36:04 +00:00
Owen Anderson bccb8c432d Flesh out the Briggs implementation a little bit more, fix a few FIXMEs. 
llvm-svn: 45347
 2007-12-24 22:12:23 +00:00
Owen Anderson e110199916 Sketch out an implementation of Briggs' copy placement algorithm. 
llvm-svn: 45334
 2007-12-23 15:37:26 +00:00
Owen Anderson 5a4c05d047 Note what still needs doing. 
llvm-svn: 45310
 2007-12-22 04:59:10 +00:00
Owen Anderson 4534100765 Remove critical edge breaking. It won't be necessary as long as we are very careful when inserting copies. 
llvm-svn: 45309
 2007-12-22 04:50:11 +00:00
Owen Anderson 7b8a741189 Break local interferences in StrongPHIElimination. One step closer... 
llvm-svn: 45070
 2007-12-16 05:44:27 +00:00
Owen Anderson ccb3981256 A few more comments. 
llvm-svn: 45069
 2007-12-16 04:07:23 +00:00
Owen Anderson 53b677e4e8 Add register pairs to the list to check for local interferences. 
llvm-svn: 44987
 2007-12-13 05:53:03 +00:00
Owen Anderson 1f93edd08a Remove ugly and horrible code. It's not necessary for correctness, and can be added back later if it causes code quality issues. 
llvm-svn: 44986
 2007-12-13 05:43:37 +00:00
Owen Anderson 499e5bffcf Forgot to remove a register from the PHI-union after I'd determined that it 
interfered with other registers.  Seems like that might be a good thing to do. :-)

llvm-svn: 44902
 2007-12-12 01:25:08 +00:00
Owen Anderson f24dd1c1eb More progress on StrongPHIElimination. Now we actually USE the DomForest! 
llvm-svn: 44877
 2007-12-11 20:12:11 +00:00
Owen Anderson ba61806ef1 A little more progress on StrongPHIElimination, now that I have a better sense of 
how the CodeGen machinery works.

llvm-svn: 44786
 2007-12-10 08:07:09 +00:00
Owen Anderson d8167ab332 Run computeDomForest() on the set of registers that need to be tested for 
interference.

llvm-svn: 44064
 2007-11-13 20:13:24 +00:00
Owen Anderson 569ef71e44 Preserve LiveVariables when doing critical edge splitting. 
llvm-svn: 44063
 2007-11-13 20:04:45 +00:00
Owen Anderson c520c4b325 Break critical edges coming into blocks with PHI nodes. 
llvm-svn: 44019
 2007-11-12 17:27:27 +00:00
Owen Anderson a1cd45213d As Chris and Evan pointed out, BreakCriticalMachineEdges doesn't really need 
to be a pass of its own.  Instead, move it out into a helper method.

llvm-svn: 44002
 2007-11-12 01:05:09 +00:00
Owen Anderson bfbc12973d Take another stab at getting isLiveIn() and isLiveOut() right. 
llvm-svn: 43869
 2007-11-08 01:32:45 +00:00
Owen Anderson c6a5387d09 Add some more of StrongPHIElim. 
llvm-svn: 43805
 2007-11-07 05:17:15 +00:00
Owen Anderson d378cea030 Add a few comments. 
llvm-svn: 43755
 2007-11-06 05:26:02 +00:00
Owen Anderson eb964eb2c8 DomForest is a forest of registers, not instructions. 
llvm-svn: 43754
 2007-11-06 05:22:43 +00:00
Owen Anderson a9057f0b97 StrongPHIElimination requires LiveVariables. 
llvm-svn: 43751
 2007-11-06 04:49:43 +00:00
Owen Anderson eea82746b3 Another step of stronger PHI elimination down. 
llvm-svn: 43684
 2007-11-04 22:33:26 +00:00
Duncan Sands 21ca939683 Add a newline at the end of the file. 
llvm-svn: 43550
 2007-10-31 08:49:24 +00:00
Owen Anderson 0b59fa0605 Add the skeleton of a better PHI elimination pass. 
llvm-svn: 43542
 2007-10-31 03:37:57 +00:00