cb7cfa4954
Revert r133607. This is causing failures in the Clang gccTestSuite.
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Specifically, gcc.c-torture/compile/pr21356.c.
llvm-svn: 133646
2011-06-22 21:13:23 +00:00
0850f709de
Reenable the optimization added in 133415, but change the definition of a "simple" bb to
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be one with only one unconditional branch and no phis. Duplicating the phis in this case
is possible, but requeres liveness analysis or breaking edges.
llvm-svn: 133607
2011-06-22 04:01:58 +00:00
02f262e942
Disable again.
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llvm-svn: 133446
2011-06-20 17:04:08 +00:00
336e10236f
Re enable 133415 with two fixes
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* Don't introduce a duplicated bb in the CFG
* When making a branch unconditional, clear the PredCond array so that it
is really unconditional.
llvm-svn: 133432
2011-06-20 14:11:42 +00:00
406b9be057
Disable the logic added by rafael in commit 133415 to see if it brings the
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dragonegg buildbots back to life. Original commit message:
Teach early dup how to duplicate basic blocks with one successor and only phi instructions
into more complex blocks.
llvm-svn: 133430
2011-06-20 09:26:23 +00:00
3f60acade6
Fix MSVC build. next() function already exists in the MSVC headers. This create a overload conflict. Make sure we pick up the llvm one.
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llvm-svn: 133416
2011-06-20 05:19:37 +00:00
ef636bffb5
Teach early dup how to duplicate basic blocks with one successor and only phi instructions
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into more complex blocks.
llvm-svn: 133415
2011-06-20 04:16:35 +00:00
e0304d1df9
Two fixes relating to debug value:
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* We should change the generated code because of a debug use.
* Avoid creating debug uses of undef, as they become a kill.
Test to follow.
llvm-svn: 133255
2011-06-17 13:59:43 +00:00
79a4b7e55c
Enable early duplication of small blocks. There are still improvements to
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be made, but this is already a win.
llvm-svn: 133240
2011-06-17 05:54:50 +00:00
0f62e4c428
Removed tabs. Also fixed my editor...
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llvm-svn: 132857
2011-06-10 21:01:53 +00:00
1ffadd7809
Remove duplicated test.
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Thanks Bob Wilson for noticing it!
llvm-svn: 132851
2011-06-10 20:08:23 +00:00
9e97a895f3
Make the optional verification step more strict.
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llvm-svn: 132822
2011-06-09 23:55:56 +00:00
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
Chad Rosier