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6025 Commits

Author SHA1 Message Date
Chris Lattner
08bc2701a2 fix PR5698 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90708 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-12-06 17:17:23 +00:00
Chris Lattner
bc9a28dd54 constant fold loads from memcpy's from global constants. This is important 
because clang lowers nontrivial automatic struct/array inits to memcpy from
a global array.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90698 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-12-06 05:29:56 +00:00
Chris Lattner
cb9cbc4949 add support for forwarding mem intrinsic values to non-local loads. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90697 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-12-06 04:54:31 +00:00
Chris Lattner
faf815b938 Handle forwarding local memsets to loads. For example, we optimize this: 
short x(short *A) {
  memset(A, 1, sizeof(*A)*100);
  return A[42];
}

to 'return 257' instead of doing the load.  



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90695 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-12-06 01:57:02 +00:00
Nick Lewycky
83e8ec73e1 Generalize this optimization to work on equality comparisons between any two 
integers that are constant except for a single bit (the same n-th bit in each).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90646 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-12-05 05:00:00 +00:00
Bob Wilson
39fdd6947c Fix up some comments. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90603 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-12-04 21:57:37 +00:00
Bob Wilson
d614a1f0a8 Fix 80-column violations. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90601 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-12-04 21:51:35 +00:00
Chris Lattner
45305d4ff6 add an assert to make it really clear what this is doing. Return singularval as 
a compile time perf optimization to avoid a load.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90507 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-12-04 01:03:32 +00:00
Bob Wilson
4a8ee23a81 Fix a comment typo. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90487 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-12-03 21:47:07 +00:00
Owen Anderson
c9f2027adb Fix this crasher, and add a FIXME for a missed optimization. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90408 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-12-03 03:43:29 +00:00
Chris Lattner
7896c9f436 improve portability to avoid conflicting with std::next in c++'0x. 
Patch by Howard Hinnant!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90365 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-12-03 00:50:42 +00:00
Jim Grosbach
43a8241b65 Move EliminateDuplicatePHINodes() from SimplifyCFG.cpp to Local.cpp 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90324 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-12-02 17:06:45 +00:00
Andreas Neustifter
059a983531 Cheap, mostly strict, stable sorting. 
This is necessary for tests so the results are comparable.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90320 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-12-02 15:57:15 +00:00
Owen Anderson
9ff5a23186 Cleanup/remove some parts of the lifetime region handling code in memdep and GVN, 
per Chris' comments.  Adjust testcases to match.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90304 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-12-02 07:35:19 +00:00
Chris Lattner
720e790480 factor some code better. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90299 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-12-02 06:44:58 +00:00
Chris Lattner
65a9ab4f8f formatting cleanups. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90298 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-12-02 06:35:55 +00:00
Chris Lattner
bf796323b2 tidy up, remove dependence on order of evaluation of function args from EmitMemCpy. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90297 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-12-02 06:05:42 +00:00
Chris Lattner
46875c0bfb fix PR5640 by tracking whether a block is the header of a loop more 
precisely, which prevents us from infinitely peeling the loop.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90211 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-12-01 06:04:43 +00:00
Benjamin Kramer
e6f329476c Revert r90089 for now, it's breaking selfhost. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90097 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-29 21:17:48 +00:00
Benjamin Kramer
4aac07e898 Fix two FIXMEs. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90089 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-29 20:29:30 +00:00
Chris Lattner
cd188e9665 add testcases for the foo_with_overflow op xforms added recently and 
fix bugs exposed by the tests.  Testcases from Alastair Lynn!



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90056 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-29 02:57:29 +00:00
Chris Lattner
3f40e23392 Implement PR5634. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90046 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-29 00:51:17 +00:00
Chris Lattner
0c264b16b0 reenable load address insertion in load pre. This allows us to 
handle cases like this:
void test(int N, double* G) {
  long j;
  for (j = 1; j < N - 1; j++)
      G[j+1] = G[j] + G[j+1];
}

where G[1] isn't live into the loop.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90041 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-28 16:08:18 +00:00
Chris Lattner
dd696052f0 Enhance InsertPHITranslatedPointer to be able to return a list of newly 
inserted instructions.  No functionality change until someone starts using it.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90039 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-28 15:39:14 +00:00
Chris Lattner
971fd57f7d disable value insertion for now, I need to figure out how 
to inform GVN about the newly inserted values.  This fixes 
PR5631.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90022 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-27 22:50:07 +00:00
Chris Lattner
6f7b210b25 Rework InsertPHITranslatedPointer to handle the recursive case, this 
fixes PR5630 and sets the stage for the next phase of goodness (testcase
pending).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90019 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-27 22:05:15 +00:00
Chris Lattner
8aee8efc0c factor some logic out of instcombine into a new SimplifyAddInst method. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90011 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-27 17:42:22 +00:00
Chris Lattner
8976e5950f fix PR5436 by making the 'simple' case of SRoA not promote out of range 
array indexes.  The "complex" case of SRoA still handles them, and correctly.

This fixes a weirdness where we'd correctly avoid transforming A[0][42] if
the 42 was too large, but we'd only do it if it was one gep, not two separate
ones.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90007 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-27 16:37:41 +00:00
Chris Lattner
616613d7a4 teach GVN's load PRE to insert computations of the address in predecessors 
where it is not available.  It's unclear how to get this inserted 
computation into GVN's scalar availability sets, Owen, help? :)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89997 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-27 08:25:10 +00:00
Chris Lattner
62deff066c Fix phi translation in load PRE to agree with the phi 
translation done by memdep, and reenable gep translation 
again.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89992 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-27 06:31:14 +00:00
Chris Lattner
c514c1f521 factor some instcombine simplifications for getelementptr out to a new 
SimplifyGEPInst method in InstructionSimplify.h.  No functionality change.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89980 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-27 00:29:05 +00:00
Chris Lattner
998e25a143 fix crash on Transforms/InstCombine/intrinsics.ll introduced by r89970 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89972 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-26 22:08:06 +00:00
Chris Lattner
21f83a2f95 Fix PR5471 by removing an instcombine xform. Some pieces of the code 
generates store to undef and some generates store to null as the idiom
for undefined behavior.  Since simplifycfg zaps both, don't remove the
undefined behavior in instcombine.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89971 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-26 22:04:42 +00:00
Chris Lattner
2bbac75e5a implement a bunch of xforms for overflow intrinsics, based on a patch 
by Alastair Lynn.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89970 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-26 21:42:47 +00:00
Edward O'Callaghan
25798439da Reverting patch in revision 89758, initial attempt at fixing PR5373 has proven to be bogus. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89844 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-25 05:38:41 +00:00
Edward O'Callaghan
de8d3b73c8 Fix for PR5373, Credit to Jakub Staszak. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89758 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-24 11:51:52 +00:00
Dan Gohman
01b97dd01e Make ConstantFoldConstantExpression recursively visit the entire 
ConstantExpr, not just the top-level operator. This allows it to
fold many more constants.

Also, make GlobalOpt call ConstantFoldConstantExpression on
GlobalVariable initializers.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89659 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-23 16:22:21 +00:00
Dan Gohman
8f3817f505 Fix a use of an invalidated iterator in the case where there are multiple 
adjacent uses of a dead basic block from the same user. This fixes PR5596.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89658 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-23 16:13:39 +00:00
Nick Lewycky
ce2c51b670 Pull LLVMContext out of PromoteMemToReg. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89645 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-23 03:50:44 +00:00
Nick Lewycky
2e0316fcf0 Remove LLVMContext and its include. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89644 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-23 03:34:29 +00:00
Nick Lewycky
ae3d802953 Remove unused LLVMContext. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89642 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-23 03:29:18 +00:00
Nick Lewycky
55bd8bd6eb Reapply r88830 with a bugfix: this transform only applies to icmp eq/ne. This 
fixes part of PR5438.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89639 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-23 03:17:33 +00:00
Eric Christopher
80bf1d5278 Add more optimizations for object size checking, enable handling of 
object size intrinsic and verify return type is correct. Collect various
code in one place.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89523 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-21 01:01:30 +00:00
Dan Gohman
a58a04921d Make Loop::getLoopLatch() work on loops which don't have preheaders, as 
it may be used in contexts where preheader insertion may have failed due
to an indirectbr.

Make LoopSimplify's LoopSimplify::SeparateNestedLoop properly fail in
the case that it would require splitting an indirectbr edge.

These fix PR5502.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89484 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-20 20:51:18 +00:00
Dan Gohman
6a2392131e Fix IPSCCP's code for deleting dead blocks to tolerate outstanding 
blockaddress users. This fixes PR5569.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89483 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-20 20:19:14 +00:00
Daniel Dunbar
f7751c134a Revert "Add some rough optimizations for checking routines.", it buildeth not. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89482 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-20 20:17:30 +00:00
Eric Christopher
3bcaa8ac95 Add some rough optimizations for checking routines. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89479 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-20 19:57:37 +00:00
Duncan Sands
76700ba64c Fix PR5563, an expensive checks failure when running on 
tests/Transforms/InstCombine/shufflemask-undef.ll.  If
anyone cares, the use of 2*e here (and the equivalent
all over the place in instcombine) seems wrong, though
harmless: it should really be twice the length of the
input vector.  I think shufflevector used to require
that the mask have the same length as the input, but I
don't think that's true any more.  I don't care enough
about vectors to do anything about this...


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89456 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-20 13:19:51 +00:00
Dan Gohman
f94b5edc45 Extend CaptureTracking to indicate when a value is never stored, even 
if it is not ultimately captured. Teach BasicAliasAnalysis that a 
local object address which does not escape and is never stored does
not alias with a value resulting from a load.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89398 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-19 21:57:48 +00:00
Dan Gohman
dab249b3b7 Enable hoisting of loads from constant memory by default. In cases where 
they are lowered to instruction sequences more complex than a simple
load, such that CodeGen cannot rematerialize them, a reload from a
spill slot is likely to be cheaper than the complex sequence.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89374 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-19 19:00:10 +00:00