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91 Commits

Author SHA1 Message Date
Rafael Espindola
689d7d5dff On last fix to the early tail duplication. 
With this I am able to bootstrap clang with early tail duplication enabled
for any small bb and setting tail-dup-size to a relatively large value(8) to
stress this code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132816 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-06-09 23:22:56 +00:00
Rafael Espindola
0f28c3f0c3 Also consider phi nodes when deciding if a register is live out. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132814 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-06-09 22:53:47 +00:00
Rafael Espindola
a899b22310 AnalyzeBranch modifies the bb, but we don't want to modify a bb with 
eh edges. Swap the order of the checks to avoid it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132806 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-06-09 21:43:25 +00:00
Rafael Espindola
c2e9a50dfb A PHI in this basic block is a use in another basic block. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132805 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-06-09 20:55:41 +00:00
Rafael Espindola
54c256233f Refactor some checks into shouldTailDuplicate. Update comments. 
No functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132798 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-06-09 19:54:42 +00:00
Rafael Espindola
d69f85eb41 Fix count. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132749 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-06-08 14:23:19 +00:00
Rafael Espindola
0cdca089b2 Count how many phis we are creating. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132748 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-06-08 14:13:31 +00:00
Evan Cheng
c8b90e22a8 Update comments. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124843 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-02-04 01:10:12 +00:00
Jakob Stoklund Olesen
8352062e52 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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124564 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-01-30 20:38:12 +00:00
Evan Cheng
c3f507f98a Re-apply r124518 with fix. Watch out for invalidated iterator. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124526 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-01-29 04:46:23 +00:00
Evan Cheng
b0a42fdb36 Revert r124518. It broke Linux self-host. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124522 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-01-29 02:43:04 +00:00
Evan Cheng
5e6940788f Re-commit r124462 with fixes. Tail recursion elim will now dup ret into unconditional predecessor to enable TCE on demand. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124518 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-01-29 01:29:26 +00:00
Evan Cheng
1b5c0cb71d Revert r124462. There are a few big regressions that I need to fix first. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124478 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-01-28 07:12:38 +00:00
Evan Cheng
40f64cb0de - 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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124462 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-01-28 02:19:21 +00:00
Jakob Stoklund Olesen
c9df025e33 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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123155 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-01-10 02:58:51 +00:00
Owen Anderson
90c579de5a Reapply r110396, with fixes to appease the Linux buildbot gods. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110460 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-06 18:33:48 +00:00
Owen Anderson
1f74590e9d Revert r110396 to fix buildbots. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110410 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-06 00:23:35 +00:00
Owen Anderson
9ccaf53ada 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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110396 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-05 23:42:04 +00:00
Jakob Stoklund Olesen
04c528a0c8 Remove many calls to TII::isMoveInstr. Targets should be producing COPY anyway. 
TII::isMoveInstr is going tobe completely removed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108507 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-07-16 04:45:42 +00:00
Jakob Stoklund Olesen
1e1098c6f3 Replace copyRegToReg with COPY everywhere in lib/CodeGen except for FastISel. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108062 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-07-10 22:42:59 +00:00
Dan Gohman
34dcc6fadc Add a DebugLoc argument to TargetInstrInfo::copyRegToReg, so that it 
doesn't have to guess.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103194 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-05-06 20:33:48 +00:00
Devang Patel
cbe1e31732 Ignore debug value instructions while analyzing BB for tail duplication. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98675 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-03-16 21:02:07 +00:00
Chris Lattner
18589de9b1 eliminate InvalidateLabel and LabelIDList from MMI and replace 
them with a counter.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98462 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-03-14 02:24:55 +00:00
Jakob Stoklund Olesen
09eeac9f5f 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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95832 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-02-11 00:34:33 +00:00
Chris Lattner
518bb53485 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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95687 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-02-09 19:54:29 +00:00
Bob Wilson
cb44b28f4d Treat indirect branches specially only during pre-regalloc tail duplication, 
not during the later post-alloc tail duplication.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93600 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-16 00:42:25 +00:00
Jakob Stoklund Olesen
057d53993c Simplify logic. Any functional change is unintended. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93540 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-15 19:59:57 +00:00
Bob Wilson
bfdcf3bd49 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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93505 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-15 06:29:17 +00:00
Jakob Stoklund Olesen
30ac0467ce Add Target hook to duplicate machine instructions. 
Some instructions refer to unique labels, and so cannot be trivially cloned
with CloneMachineInstr.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92873 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-06 23:47:07 +00:00
David Greene
00dec1bbf9 Change errs() to dbgs(). 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92582 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-05 01:25:15 +00:00
Evan Cheng
3466f13f38 Tail duplication should zap a copy it inserted for SSA update if the copy is the only use of its source. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91390 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-12-15 01:44:10 +00:00
Evan Cheng
80564f761a Delete code accidentally left behind. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90804 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-12-07 21:19:33 +00:00
Evan Cheng
75eb535843 Pre-regalloc tale duplication. Work in progress. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90759 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-12-07 10:15:19 +00:00
Evan Cheng
11572babb1 Handle recursive PHI's. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90575 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-12-04 19:09:10 +00:00
Evan Cheng
79fc6f44b6 Add a pre-regalloc tail duplication pass. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90567 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-12-04 09:42:45 +00:00
Evan Cheng
111e7629cc Teach tail duplication to update SSA form. Work in progress. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90432 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-12-03 08:43:53 +00:00
Bob Wilson
f1e01dcc94 Don't count PHI instructions toward the limit for tail duplicating a block. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90326 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-12-02 17:15:24 +00:00
Bob Wilson
3858225afc 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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90147 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-30 18:56:45 +00:00
Bob Wilson
15217e63bc 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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90144 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-30 18:35:03 +00:00
Bob Wilson
2d521e51ac Rename new TailDuplicationPass to avoid name conflict with the old one. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89968 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-26 21:38:41 +00:00
Bob Wilson
15acadde5f 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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89904 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-26 00:32:21 +00:00