c9e93a44be
Avoid a gcc warning about multiline comments.
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llvm-svn: 132821
2011-06-09 23:51:45 +00:00
c735f13368
On last fix to the early tail duplication.
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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.
llvm-svn: 132816
2011-06-09 23:22:56 +00:00
81512fc1bb
Also consider phi nodes when deciding if a register is live out.
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llvm-svn: 132814
2011-06-09 22:53:47 +00:00
c90a32a4e6
AnalyzeBranch modifies the bb, but we don't want to modify a bb with
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eh edges. Swap the order of the checks to avoid it.
llvm-svn: 132806
2011-06-09 21:43:25 +00:00
887fc1bdeb
A PHI in this basic block is a use in another basic block.
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llvm-svn: 132805
2011-06-09 20:55:41 +00:00
73f93930e0
Refactor some checks into shouldTailDuplicate. Update comments.
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No functionality change.
llvm-svn: 132798
2011-06-09 19:54:42 +00:00
eabd18b931
Fix count.
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llvm-svn: 132749
2011-06-08 14:23:19 +00:00
dfbf6de747
Count how many phis we are creating.
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llvm-svn: 132748
2011-06-08 14:13:31 +00:00
f7073d1445
Update comments.
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llvm-svn: 124843
2011-02-04 01:10:12 +00:00
9af7afcb7f
Respect the -tail-dup-size command line option even when optimizing for size.
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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
d983eba7dc
Re-apply r124518 with fix. Watch out for invalidated iterator.
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llvm-svn: 124526
2011-01-29 04:46:23 +00:00
65b8ccf6ac
Revert r124518. It broke Linux self-host.
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llvm-svn: 124522
2011-01-29 02:43:04 +00:00
d4eff31476
Re-commit r124462 with fixes. Tail recursion elim will now dup ret into unconditional predecessor to enable TCE on demand.
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llvm-svn: 124518
2011-01-29 01:29:26 +00:00
aaa9606b2f
Revert r124462. There are a few big regressions that I need to fix first.
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llvm-svn: 124478
2011-01-28 07:12:38 +00:00
417fca86c4
- Stop simplifycfg from duplicating "ret" instructions into unconditional
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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
2fb5b31578
Simplify a bunch of isVirtualRegister() and isPhysicalRegister() logic.
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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
a7aed18624
Reapply r110396, with fixes to appease the Linux buildbot gods.
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llvm-svn: 110460
2010-08-06 18:33:48 +00:00
bda59bd247
Revert r110396 to fix buildbots.
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llvm-svn: 110410
2010-08-06 00:23:35 +00:00
755aceb5d0
Don't use PassInfo* as a type identifier for passes. Instead, use the address of the static
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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
37c42a3d02
Remove many calls to TII::isMoveInstr. Targets should be producing COPY anyway.
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TII::isMoveInstr is going tobe completely removed.
llvm-svn: 108507
2010-07-16 04:45:42 +00:00
0c76d6ec21
Replace copyRegToReg with COPY everywhere in lib/CodeGen except for FastISel.
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llvm-svn: 108062
2010-07-10 22:42:59 +00:00
779c69bbc5
Add a DebugLoc argument to TargetInstrInfo::copyRegToReg, so that it
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doesn't have to guess.
llvm-svn: 103194
2010-05-06 20:33:48 +00:00
a0bb715977
Ignore debug value instructions while analyzing BB for tail duplication.
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llvm-svn: 98675
2010-03-16 21:02:07 +00:00
07293da97e
eliminate InvalidateLabel and LabelIDList from MMI and replace
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them with a counter.
llvm-svn: 98462
2010-03-14 02:24:55 +00:00
75521cab3e
Reuse operand location when updating PHI instructions.
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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
b06015aa69
move target-independent opcodes out of TargetInstrInfo
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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
97598f0cba
Treat indirect branches specially only during pre-regalloc tail duplication,
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not during the later post-alloc tail duplication.
llvm-svn: 93600
2010-01-16 00:42:25 +00:00
73ef9556dd
Simplify logic. Any functional change is unintended.
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llvm-svn: 93540
2010-01-15 19:59:57 +00:00
1a234c0aee
Change pre-regalloc tail duplication to only duplicate indirect branch blocks.
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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
29a64c9575
Add Target hook to duplicate machine instructions.
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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
85afc853b5
Change errs() to dbgs().
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llvm-svn: 92582
2010-01-05 01:25:15 +00:00
45430bbfaa
Tail duplication should zap a copy it inserted for SSA update if the copy is the only use of its source.
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llvm-svn: 91390
2009-12-15 01:44:10 +00:00
d9cb324d7c
Delete code accidentally left behind.
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llvm-svn: 90804
2009-12-07 21:19:33 +00:00
cc77062194
Pre-regalloc tale duplication. Work in progress.
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llvm-svn: 90759
2009-12-07 10:15:19 +00:00
9e67255748
Handle recursive PHI's.
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llvm-svn: 90575
2009-12-04 19:09:10 +00:00
6154dbd5ee
Add a pre-regalloc tail duplication pass.
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llvm-svn: 90567
2009-12-04 09:42:45 +00:00
1bbe6be037
Teach tail duplication to update SSA form. Work in progress.
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llvm-svn: 90432
2009-12-03 08:43:53 +00:00
fffbc0c5d9
Don't count PHI instructions toward the limit for tail duplicating a block.
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llvm-svn: 90326
2009-12-02 17:15:24 +00:00
598f8ff9e5
Reprioritize tests for tail duplication to be aggressive about indirect
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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
505ddaa4dc
Remove isProfitableToDuplicateIndirectBranch target hook. It is profitable
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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
9594db5693
Rename new TailDuplicationPass to avoid name conflict with the old one.
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llvm-svn: 89968
2009-11-26 21:38:41 +00:00
2d4ff12da9
Split tail duplication into a separate pass. This is needed to avoid
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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
Rafael Espindola