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34 Commits

Author SHA1 Message Date
Evan Cheng f7073d1445 Update comments. 
llvm-svn: 124843
 2011-02-04 01:10:12 +00:00
Jakob Stoklund Olesen 9af7afcb7f Respect the -tail-dup-size command line option even when optimizing for size. 
This is similar to the -unroll-threshold option. There should be no change in
behavior when -tail-dup-size is not explicit on the llc command line.

llvm-svn: 124564
 2011-01-30 20:38:12 +00:00
Evan Cheng d983eba7dc Re-apply r124518 with fix. Watch out for invalidated iterator. 
llvm-svn: 124526
 2011-01-29 04:46:23 +00:00
Evan Cheng 65b8ccf6ac Revert r124518. It broke Linux self-host. 
llvm-svn: 124522
 2011-01-29 02:43:04 +00:00
Evan Cheng d4eff31476 Re-commit r124462 with fixes. Tail recursion elim will now dup ret into unconditional predecessor to enable TCE on demand. 
llvm-svn: 124518
 2011-01-29 01:29:26 +00:00
Evan Cheng aaa9606b2f Revert r124462. There are a few big regressions that I need to fix first. 
llvm-svn: 124478
 2011-01-28 07:12:38 +00:00
Evan Cheng 417fca86c4 - Stop simplifycfg from duplicating "ret" instructions into unconditional 
branches. PR8575, rdar://5134905, rdar://8911460.
- Allow codegen tail duplication to dup small return blocks after register
  allocation is done.

llvm-svn: 124462
 2011-01-28 02:19:21 +00:00
Jakob Stoklund Olesen 2fb5b31578 Simplify a bunch of isVirtualRegister() and isPhysicalRegister() logic. 
These functions not longer assert when passed 0, but simply return false instead.

No functional change intended.

llvm-svn: 123155
 2011-01-10 02:58:51 +00:00
Owen Anderson a7aed18624 Reapply r110396, with fixes to appease the Linux buildbot gods. 
llvm-svn: 110460
 2010-08-06 18:33:48 +00:00
Owen Anderson bda59bd247 Revert r110396 to fix buildbots. 
llvm-svn: 110410
 2010-08-06 00:23:35 +00:00
Owen Anderson 755aceb5d0 Don't use PassInfo* as a type identifier for passes. Instead, use the address of the static 
ID member as the sole unique type identifier.  Clean up APIs related to this change.

llvm-svn: 110396
 2010-08-05 23:42:04 +00:00
Jakob Stoklund Olesen 37c42a3d02 Remove many calls to TII::isMoveInstr. Targets should be producing COPY anyway. 
TII::isMoveInstr is going tobe completely removed.

llvm-svn: 108507
 2010-07-16 04:45:42 +00:00
Jakob Stoklund Olesen 0c76d6ec21 Replace copyRegToReg with COPY everywhere in lib/CodeGen except for FastISel. 
llvm-svn: 108062
 2010-07-10 22:42:59 +00:00
Dan Gohman 779c69bbc5 Add a DebugLoc argument to TargetInstrInfo::copyRegToReg, so that it 
doesn't have to guess.

llvm-svn: 103194
 2010-05-06 20:33:48 +00:00
Devang Patel a0bb715977 Ignore debug value instructions while analyzing BB for tail duplication. 
llvm-svn: 98675
 2010-03-16 21:02:07 +00:00
Chris Lattner 07293da97e eliminate InvalidateLabel and LabelIDList from MMI and replace 
them with a counter.

llvm-svn: 98462
 2010-03-14 02:24:55 +00:00
Jakob Stoklund Olesen 75521cab3e Reuse operand location when updating PHI instructions. 
Calling RemoveOperand is very expensive on huge PHI instructions. This makes
early tail duplication run twice as fast on the Firefox JavaScript
interpreter.

llvm-svn: 95832
 2010-02-11 00:34:33 +00:00
Chris Lattner b06015aa69 move target-independent opcodes out of TargetInstrInfo 
into TargetOpcodes.h.  #include the new TargetOpcodes.h
into MachineInstr.  Add new inline accessors (like isPHI())
to MachineInstr, and start using them throughout the 
codebase.

llvm-svn: 95687
 2010-02-09 19:54:29 +00:00
Bob Wilson 97598f0cba Treat indirect branches specially only during pre-regalloc tail duplication, 
not during the later post-alloc tail duplication.

llvm-svn: 93600
 2010-01-16 00:42:25 +00:00
Jakob Stoklund Olesen 73ef9556dd Simplify logic. Any functional change is unintended. 
llvm-svn: 93540
 2010-01-15 19:59:57 +00:00
Bob Wilson 1a234c0aee Change pre-regalloc tail duplication to only duplicate indirect branch blocks. 
The pre-regalloc pass caused some regressions in both compile time and
performance of the generated code, and it did not improve performance, except
for indirect branches.  I also moved the check for single-block loops to speed
up the common case when running the taildup pass before reg allocation.

llvm-svn: 93505
 2010-01-15 06:29:17 +00:00
Jakob Stoklund Olesen 29a64c9575 Add Target hook to duplicate machine instructions. 
Some instructions refer to unique labels, and so cannot be trivially cloned
with CloneMachineInstr.

llvm-svn: 92873
 2010-01-06 23:47:07 +00:00
David Greene 85afc853b5 Change errs() to dbgs(). 
llvm-svn: 92582
 2010-01-05 01:25:15 +00:00
Evan Cheng 45430bbfaa Tail duplication should zap a copy it inserted for SSA update if the copy is the only use of its source. 
llvm-svn: 91390
 2009-12-15 01:44:10 +00:00
Evan Cheng d9cb324d7c Delete code accidentally left behind. 
llvm-svn: 90804
 2009-12-07 21:19:33 +00:00
Evan Cheng cc77062194 Pre-regalloc tale duplication. Work in progress. 
llvm-svn: 90759
 2009-12-07 10:15:19 +00:00
Evan Cheng 9e67255748 Handle recursive PHI's. 
llvm-svn: 90575
 2009-12-04 19:09:10 +00:00
Evan Cheng 6154dbd5ee Add a pre-regalloc tail duplication pass. 
llvm-svn: 90567
 2009-12-04 09:42:45 +00:00
Evan Cheng 1bbe6be037 Teach tail duplication to update SSA form. Work in progress. 
llvm-svn: 90432
 2009-12-03 08:43:53 +00:00
Bob Wilson fffbc0c5d9 Don't count PHI instructions toward the limit for tail duplicating a block. 
llvm-svn: 90326
 2009-12-02 17:15:24 +00:00
Bob Wilson 598f8ff9e5 Reprioritize tests for tail duplication to be aggressive about indirect 
branches even when optimizing for code size.  Unless we find evidence to the
contrary in the future, the special treatment for indirect branches does not
have a significant effect on code size, and performance still matters with -Os.

llvm-svn: 90147
 2009-11-30 18:56:45 +00:00
Bob Wilson 505ddaa4dc Remove isProfitableToDuplicateIndirectBranch target hook. It is profitable 
for all the processors where I have tried it, and even when it might not help
performance, the cost is quite low.  The opportunities for duplicating
indirect branches are limited by other factors so code size does not change
much due to tail duplicating indirect branches aggressively.

llvm-svn: 90144
 2009-11-30 18:35:03 +00:00
Bob Wilson 9594db5693 Rename new TailDuplicationPass to avoid name conflict with the old one. 
llvm-svn: 89968
 2009-11-26 21:38:41 +00:00
Bob Wilson 2d4ff12da9 Split tail duplication into a separate pass. This is needed to avoid 
running tail duplication when doing branch folding for if-conversion, and
we also want to be able to run tail duplication earlier to fix some
reg alloc problems.  Move the CanFallThrough function from BranchFolding
to MachineBasicBlock so that it can be shared by TailDuplication.

llvm-svn: 89904
 2009-11-26 00:32:21 +00:00