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83 Commits

Author SHA1 Message Date
Dan Gohman
aad233ea10 Use empty() instead of comparing size() with zero. 
llvm-svn: 46514
 2008-01-29 13:02:09 +00:00
Chris Lattner
f83aae613c rename TargetInstrDescriptor -> TargetInstrDesc. 
Make MachineInstr::getDesc return a reference instead
of a pointer, since it can never be null.

llvm-svn: 45695
 2008-01-07 07:27:27 +00:00
Chris Lattner
f7f96d818f Rename MachineInstr::getInstrDescriptor -> getDesc(), which reflects 
that it is cheap and efficient to get.

Move a variety of predicates from TargetInstrInfo into 
TargetInstrDescriptor, which makes it much easier to query a predicate
when you don't have TII around.  Now you can use MI->getDesc()->isBranch()
instead of going through TII, and this is much more efficient anyway. Not
all of the predicates have been moved over yet.

Update old code that used MI->getInstrDescriptor()->Flags to use the
new predicates in many places.

llvm-svn: 45674
 2008-01-07 01:56:04 +00:00
Chris Lattner
14310afe42 rename isLoad -> isSimpleLoad due to evan's desire to have such a predicate. 
llvm-svn: 45667
 2008-01-06 23:38:27 +00:00
Chris Lattner
5489888580 rename isStore -> mayStore to more accurately reflect what it captures. 
llvm-svn: 45656
 2008-01-06 08:36:04 +00:00
Chris Lattner
9e5cc35593 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
ad9a6ccb83 Remove attribution from file headers, per discussion on llvmdev. 
llvm-svn: 45418
 2007-12-29 20:36:04 +00:00
Christopher Lamb
5c577eb543 Improve branch folding by recgonizing that explict successor relationships impact the value of fall-through choices. 
llvm-svn: 44785
 2007-12-10 07:24:06 +00:00
Bill Wendling
27f7cac311 Changed XXX to FIXME, and added comment to the README file 
llvm-svn: 43359
 2007-10-25 19:49:32 +00:00
Bill Wendling
34d5118422 Added comment explaining why we are doing this check. 
llvm-svn: 43353
 2007-10-25 18:23:45 +00:00
Bill Wendling
df262eb966 Don't branch fold inline asm statements. 
llvm-svn: 43191
 2007-10-19 21:09:55 +00:00
Dan Gohman
352de5aeb9 More explicit keywords. 
llvm-svn: 40757
 2007-08-02 21:21:54 +00:00
Duncan Sands
aa83dc9037 If assertions are not enabled, we should return False here. 
llvm-svn: 38535
 2007-07-11 08:47:55 +00:00
David Greene
8d77dcca00 Make this work with GLIBCXX_DEBUG. 
llvm-svn: 38516
 2007-07-10 22:00:30 +00:00
David Greene
ad230f223f Fix misue of iterator pointing to erased object. Uncovered by 
_GLIBCXX_DEBUG.

llvm-svn: 37793
 2007-06-29 02:45:24 +00:00
Evan Cheng
978058bcd7 Move CorrectExtraCFGEdges() from BranchFolding.cpp to a MachineBasicBlock method. 
llvm-svn: 37633
 2007-06-18 22:43:58 +00:00
Dale Johannesen
74ffb6ffb3 Make throttle a hidden parameter, per review. 
llvm-svn: 37511
 2007-06-08 01:08:52 +00:00
Dale Johannesen
0903dd4e52 Throttle tail merging; handling blocks with large numbers of predecessors 
is too slow.

llvm-svn: 37509
 2007-06-08 00:34:27 +00:00
Dale Johannesen
a68662e4a4 Tail merging wasn't working for predecessors of landing pads. PR 1496. 
llvm-svn: 37427
 2007-06-04 23:52:54 +00:00
Evan Cheng
0dbe4d04db Move ReplaceUsesOfBlockWith() out of BranchFolding into a MachineBasicBlock general facility. 
llvm-svn: 37408
 2007-06-04 06:44:01 +00:00
Dale Johannesen
63d49a09aa Fix CorrectExtraCFGEdges to allow for multiple LandingPad targets. 
llvm-svn: 37394
 2007-06-02 00:08:15 +00:00
Dale Johannesen
fd7f1ad2f7 Implement smarter algorithm for choosing which blocks to tail-merge. 
See test/CodeGen/X86/test-pic-jtbl.ll for a case where it works well;
shaves another 10K off our favorite benchmark.  I was hesitant about
this because of compile speed, but seems to do OK on a bootstrap.

llvm-svn: 37392
 2007-06-01 23:02:45 +00:00
Dale Johannesen
4ca6f07cf0 Arrange for only 1 of multiple branches to landing pad to be kept. 
Do not remove empty landing pads (EH table needs to be updated)

llvm-svn: 37375
 2007-05-31 21:54:00 +00:00
Dale Johannesen
b306dfb861 Changed per review comment. 
llvm-svn: 37355
 2007-05-30 00:32:01 +00:00
Dale Johannesen
1ba04f7d87 Make stable_sort in tail merging actually be stable (it never was, but didn't 
matter until my last change).  Reenable tail merging by default.

llvm-svn: 37354
 2007-05-29 23:47:50 +00:00
Dale Johannesen
86fb3a132a Blocks that cond-br and uncond-br/fallthrough to same block should have 
only one successor.

llvm-svn: 37324
 2007-05-24 18:31:55 +00:00
Dale Johannesen
ecaa8a0fb4 Fix for PR1444: do not create two successors to the same block. 
Temporarily, this breaks CodeGen/Generic/2006-02-12-InsertLibraryCall.ll
by exposing an unrelated latent problem; working on that.

llvm-svn: 37323
 2007-05-24 17:39:32 +00:00
Dale Johannesen
d0b7bbe261 Two tail merging improvements: 
When considering blocks with more than 2 predecessors, merge the block with
the largest number of matching insns, rather than the first block found.
Considering that 1 matching insn is enough to show a win for candidates that
already end with a branch.

llvm-svn: 37315
 2007-05-23 21:07:20 +00:00
Dale Johannesen
fe0fe14411 Make tail merging the default, except on powerPC. There was no prior art 
for a target-dependent default with a command-line override; this way
should be generally usable.

llvm-svn: 37285
 2007-05-22 17:14:46 +00:00
Dale Johannesen
ca37006ffb Remove some unneeded branches. (spotted by Evan, thanks) 
llvm-svn: 37198
 2007-05-18 01:28:58 +00:00
Dale Johannesen
78ae2e1acb Remove extra CFG edges before doing these passes; it makes them happier. 
llvm-svn: 37089
 2007-05-15 21:19:17 +00:00
Dale Johannesen
2f28ffc5fd Do not generate branches to entry block. This fixes several test suite 
failures on PPC (can happen only when prologue code is null)

llvm-svn: 36979
 2007-05-10 23:59:23 +00:00
Dale Johannesen
4f9661688c Make tail merging handle many more cases (all it can, I think). 
llvm-svn: 36966
 2007-05-10 01:01:49 +00:00
Dale Johannesen
c884abe112 Handle some non-exit blocks in tail merging. 
llvm-svn: 36907
 2007-05-07 20:57:21 +00:00
Devang Patel
cd45427a87 Drop 'const' 
llvm-svn: 36662
 2007-05-03 01:11:54 +00:00
Devang Patel
8ee9065162 Use 'static const char' instead of 'static const int'. 
Due to darwin gcc bug, one version of darwin linker coalesces
static const int, which defauts PassID based pass identification.

llvm-svn: 36652
 2007-05-02 21:39:20 +00:00
Devang Patel
38a66bc82e Do not use typeinfo to identify pass in pass manager. 
llvm-svn: 36632
 2007-05-01 21:15:47 +00:00
Chris Lattner
8da69f853c Fix PR1228 and CodeGen/Generic/2007-04-30-LandingPadBranchFolding.ll 
llvm-svn: 36602
 2007-04-30 23:35:00 +00:00
Dale Johannesen
50a22f6fe6 maintain LiveIn when splitting blocks (register scavenging needs it) 
llvm-svn: 35226
 2007-03-20 21:35:06 +00:00
Jim Laskey
8c79f0f892 Remove isAccessable. 
llvm-svn: 34497
 2007-02-22 16:39:03 +00:00
Jim Laskey
b56b6a7042 Make branch folding behave in the presence of landing pads. 
llvm-svn: 34476
 2007-02-21 22:42:20 +00:00
Dale Johannesen
960bd79f88 Fixes PR 1200 
llvm-svn: 34359
 2007-02-17 00:44:34 +00:00
Jim Laskey
64f4242072 Change the MachineDebugInfo to MachineModuleInfo to better reflect usage 
for debugging and exception handling.

llvm-svn: 33550
 2007-01-26 21:22:28 +00:00
Jim Laskey
23ed7d2625 Make LABEL a builtin opcode. 
llvm-svn: 33537
 2007-01-26 14:34:52 +00:00
Chris Lattner
a975b95adb Eliminate static ctors from Statistics 
llvm-svn: 32698
 2006-12-19 22:41:21 +00:00
Chris Lattner
a531ce882e Detemplatize the Statistic class. The only type it is instantiated with 
is 'unsigned'.

llvm-svn: 32279
 2006-12-06 17:46:33 +00:00
Chris Lattner
4946ae54df Don't transform in another bad case: if the block is empty, it should be 
simplified before we do this xform so that our cost model is accurate.

llvm-svn: 31864
 2006-11-18 22:25:39 +00:00
Chris Lattner
b101c06bce Fix another case we *don't* want to do this xform. 
llvm-svn: 31861
 2006-11-18 21:56:39 +00:00
Chris Lattner
514fc3de5c make the previous change more aggressive, moving any block with no fallthrough. 
This speeds up yacr2 by 7% on a core2.

llvm-svn: 31856
 2006-11-18 21:30:35 +00:00
Chris Lattner
bddc114cfb Minor code layout tweak: if we have something like this: 
if (cond) goto BB2
BB1:
    ...
    return;
BB2:
   ...

Move BB1 to the end of the function so that the code falls through in the
non-return case.  This has the effect of moving assert (and other no-return
call) bodies and return blocks out of loops.

llvm-svn: 31855
 2006-11-18 20:47:54 +00:00