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588 Commits

Author SHA1 Message Date
Bob Wilson
1115365fcf Refactor to share code to find the position of a basic block successor in the 
terminator's list of successors.

llvm-svn: 96377
 2010-02-16 19:49:17 +00:00
Eric Christopher
871cf7bce2 Pull these back out, they're a little too aggressive and time 
consuming for a simple optimization.

llvm-svn: 95671
 2010-02-09 17:29:18 +00:00
Eric Christopher
428b385575 Add a new pass to do llvm.objsize lowering using SCEV. 
Initial skeleton and SCEVUnknown lowering implemented,
the rest should come relatively quickly.  Move testcase
to new directory.

Move pass to right before SimplifyLibCalls - which is
moved down a bit so we can take advantage of a few opts.

llvm-svn: 95628
 2010-02-09 00:35:38 +00:00
Jakob Stoklund Olesen
83ebc265b3 Reintroduce the InlineHint function attribute. 
This time it's for real! I am going to hook this up in the frontends as well.

The inliner has some experimental heuristics for dealing with the inline hint.
When given a -respect-inlinehint option, functions marked with the inline
keyword are given a threshold just above the default for -O3.

We need some experiments to determine if that is the right thing to do.

llvm-svn: 95466
 2010-02-06 01:16:28 +00:00
Jakob Stoklund Olesen
670458b3be Teach SimplifyCFG about magic pointer constants. 
Weird code sometimes uses pointer constants other than null. This patch
teaches SimplifyCFG to build switch instructions in those cases.

Code like this:

void f(const char *x) {
  if (!x)
    puts("null");
  else if ((uintptr_t)x == 1)
    puts("one");
  else if (x == (char*)2 || x == (char*)3)
    puts("two");
  else if ((intptr_t)x == 4)
    puts("four");
  else
    puts(x);
}

Now becomes a switch:

define void @f(i8* %x) nounwind ssp {
entry:
  %magicptr23 = ptrtoint i8* %x to i64            ; <i64> [#uses=1]
  switch i64 %magicptr23, label %if.else16 [
    i64 0, label %if.then
    i64 1, label %if.then2
    i64 2, label %if.then9
    i64 3, label %if.then9
    i64 4, label %if.then14
  ]

Note that LLVM's own DenseMap uses magic pointers.

llvm-svn: 95439
 2010-02-05 22:03:18 +00:00
Bob Wilson
0f04082970 Check alignment of loads when deciding whether it is safe to execute them 
unconditionally.  Besides checking the offset, also check that the underlying
object is aligned as much as the load itself.

llvm-svn: 94875
 2010-01-30 04:42:39 +00:00
Bob Wilson
f897b7b37e Improve isSafeToLoadUnconditionally to recognize that GEPs with constant 
indices are safe if the result is known to be within the bounds of the
underlying object.

llvm-svn: 94829
 2010-01-29 19:19:08 +00:00
Benjamin Kramer
cfe07fadc7 Don't bother with sprintf, just pass the Twine through. 
llvm-svn: 94684
 2010-01-27 19:58:47 +00:00
Victor Hernandez
d44671b931 DbgInfoIntrinsics no longer appear in an instruction's use list; so clean up looking for them in use iterations and remove OnlyUsedByDbgInfoIntrinsics() 
llvm-svn: 94111
 2010-01-21 23:05:53 +00:00
Jakob Stoklund Olesen
ac14f3bf31 Move per-function inline threshold calculation to a method. 
No functional change except the forgotten test for
InlineLimit.getNumOccurrences() == 0 in the CurrentThreshold2 calculation.

llvm-svn: 94007
 2010-01-20 17:51:28 +00:00
Chris Lattner
87f86498c3 add a helper function. 
llvm-svn: 93251
 2010-01-12 19:40:54 +00:00
Dan Gohman
41cc1e1fc4 Make RecursivelyDeleteTriviallyDeadInstructions, 
RecursivelyDeleteDeadPHINode, and DeleteDeadPHIs return a flag
indicating whether they made any changes.

llvm-svn: 92732
 2010-01-05 15:45:31 +00:00
Chris Lattner
48618eeec3 convert various IntrinsicInst's to use class instead of struct. 
llvm-svn: 92681
 2010-01-05 05:21:26 +00:00
Devang Patel
3b08c33f33 Remove dead debug info intrinsics. 
Intrinsic::dbg_stoppoint
 Intrinsic::dbg_region_start 
 Intrinsic::dbg_region_end 
 Intrinsic::dbg_func_start
AutoUpgrade simply ignores these intrinsics now.

llvm-svn: 92557
 2010-01-05 01:10:40 +00:00
Chris Lattner
07a1a284d3 remove the random sampling framework, which is not maintained anymore. 
If there is interest, it can be resurrected from SVN.  PR4912.

llvm-svn: 92422
 2010-01-02 20:07:03 +00:00
Chris Lattner
41047d373d comment fix: weakvh -> tracking vh 
llvm-svn: 91867
 2009-12-22 00:51:57 +00:00
Dan Gohman
4e04fb5ca8 Eliminate unnecessary LLVMContexts. 
llvm-svn: 91729
 2009-12-18 23:42:08 +00:00
Nick Lewycky
b3bedf4b2d Pull LLVMContext out of PromoteMemToReg. 
llvm-svn: 89645
 2009-11-23 03:50:44 +00:00
Jim Grosbach
5787c6eb88 Make EliminateDuplicatePHINodes() available as a utility function 
llvm-svn: 89297
 2009-11-19 02:02:10 +00:00
Dan Gohman
406baaac43 Add an option for running GVN with redundant load processing disabled. 
llvm-svn: 88742
 2009-11-14 02:27:51 +00:00
Chris Lattner
36009e416c remove the now dead condprop pass, PR3906. 
llvm-svn: 86810
 2009-11-11 05:56:35 +00:00
Devang Patel
5c983cb2ab Implement support to debug inlined functions. 
llvm-svn: 86748
 2009-11-10 23:06:00 +00:00
Chris Lattner
ec4264fbb0 move some generally useful functions out of jump threading 
into libanalysis and transformutils.

llvm-svn: 86735
 2009-11-10 22:26:15 +00:00
Chris Lattner
9428f34d89 refactor TryToSimplifyUncondBranchFromEmptyBlock out of SimplifyCFG. 
llvm-svn: 86666
 2009-11-10 05:59:26 +00:00
Douglas Gregor
cc2c05cb75 Make a few more LLVM headers parsable as standalone headers. 
Fix some problems with the hidden copy constructors for
ImmutableMap/ImmutableSet found by Clang++.

llvm-svn: 86186
 2009-11-05 23:01:30 +00:00
Duncan Sands
555af234e6 Improve the other instance of the comment. 
llvm-svn: 85733
 2009-11-01 19:16:21 +00:00
Chris Lattner
ea1bebaa65 update the comment above llvm::SplitCriticalEdge, and make 
it abort on IndirectBrInst as describe in the comment.

llvm-svn: 85688
 2009-10-31 21:51:10 +00:00
Dan Gohman
61e806613f Revert r85667. LoopUnroll currently can't call utility functions which 
auto-update the DominatorTree because it doesn't keep the DominatorTree
current while it works.

llvm-svn: 85670
 2009-10-31 17:33:01 +00:00
Dan Gohman
40cec16be1 Merge the enhancements from LoopUnroll's FoldBlockIntoPredecessor into 
MergeBlockIntoPredecessor. This makes SimplifyCFG slightly more aggressive,
and makes it unnecessary for LoopUnroll to have its own copy of this code.

llvm-svn: 85667
 2009-10-31 16:08:00 +00:00
Dan Gohman
04c536dff6 Remove CodeGenLICM. It's largely obsoleted by MachineLICM's new ability 
to unfold loop-invariant loads.

llvm-svn: 85657
 2009-10-31 14:35:41 +00:00
Evan Cheng
8db8f72185 Add option to createGVNPass to disable PRE. 
llvm-svn: 85609
 2009-10-30 20:12:24 +00:00
Nick Lewycky
0376e34268 Add ABCD, a generalized implementation of the Elimination of Array Bounds 
Checks on Demand algorithm which looks at arbitrary branches instead of loop
iterations. This is GSoC work by Andre Tavares with only editorial changes
applied!

llvm-svn: 85382
 2009-10-28 07:03:15 +00:00
Owen Anderson
646c3e1e3d Forgot to commit these. 
llvm-svn: 85180
 2009-10-26 23:56:52 +00:00
Victor Hernandez
673c036bc7 Remove FreeInst. 
Remove LowerAllocations pass.
Update some more passes to treate free calls just like they were treating FreeInst.

llvm-svn: 85176
 2009-10-26 23:43:48 +00:00
Dan Gohman
05a91cc09f Check in the experimental GEP splitter pass. This pass splits complex 
GEPs (more than one non-zero index) into simple GEPs (at most one
non-zero index).  In some simple experiments using this it's not
uncommon to see 3% overall code size wins, because it exposes
redundancies that can be eliminated, however it's tricky to use
because instcombine aggressively undoes the work that this pass does.

llvm-svn: 85144
 2009-10-26 19:12:14 +00:00
Dan Gohman
07044648b2 MapValue doesn't needs its LLVMContext argument. 
llvm-svn: 85020
 2009-10-24 23:37:16 +00:00
Dan Gohman
a4883a3903 Add an explicit keyword. 
llvm-svn: 85009
 2009-10-24 19:56:23 +00:00
Victor Hernandez
e8998896f5 Auto-upgrade free instructions to calls to the builtin free function. 
Update all analysis passes and transforms to treat free calls just like FreeInst.
Remove RaiseAllocations and all its tests since FreeInst no longer needs to be raised.

llvm-svn: 84987
 2009-10-24 04:23:03 +00:00
Chris Lattner
6077ca46bb remove the IndMemRemPass, which only made sense for when malloc/free were intrinsic 
instructions.

llvm-svn: 84404
 2009-10-18 05:02:09 +00:00
Victor Hernandez
a25a2890fa Remove MallocInst from LLVM Instructions. 
llvm-svn: 84299
 2009-10-17 01:18:07 +00:00
Duncan Sands
4cde5474aa Strip trailing white space. 
llvm-svn: 84256
 2009-10-16 15:20:13 +00:00
Dan Gohman
18cdd7ef1b Move the InlineCost code from Transforms/Utils to Analysis. 
llvm-svn: 83998
 2009-10-13 18:30:07 +00:00
Dan Gohman
f277c57aad Start refactoring the inline cost estimation code so that it can be used 
for purposes other than inlining.

llvm-svn: 83997
 2009-10-13 18:24:11 +00:00
Chris Lattner
0aa320ae4d add a simple helper method. 
llvm-svn: 83745
 2009-10-10 23:41:48 +00:00
Chris Lattner
acf73d9839 add ability for clients of SSAUpdater to find out about the 
PHI nodes inserted.

llvm-svn: 83744
 2009-10-10 23:15:24 +00:00
Chris Lattner
db4d523cca add the ability to get a rewritten value from the middle of a block, 
not just at the end.  Add a big comment explaining when this could
be useful (which never happens for jump threading).

llvm-svn: 83741
 2009-10-10 23:00:11 +00:00
Chris Lattner
9899ce267c rename GetValueInBlock -> GetValueAtEndOfBlock to better reflect 
what it does.

llvm-svn: 83740
 2009-10-10 22:41:58 +00:00
Chris Lattner
9c5aa00411 Implement an efficient and fully general SSA update mechanism that 
works on unstructured CFGs.  This implements PR217, our oldest open PR.

llvm-svn: 83705
 2009-10-10 09:04:27 +00:00
Dale Johannesen
7691b73da0 Use names instead of numbers for some of the magic 
constants used in inlining heuristics (especially
those used in more than one file).  No functional change.

llvm-svn: 83675
 2009-10-09 21:42:02 +00:00
Chris Lattner
e87add4b88 remove predicate simplifier, it never got the last bugs beaten 
out of it, and jump threading, condprop and gvn are now getting
most of the benefit.  This was approved by Nicholas and Nicolas.

llvm-svn: 83390
 2009-10-06 16:59:46 +00:00