Commit Graph

82 Commits

Author SHA1 Message Date
Andrew Trick
3228cc259b Added SCEV::NoWrapFlags to manage unsigned, signed, and self wrap
properties.
Added the self-wrap flag for SCEV::AddRecExpr.
A slew of temporary FIXMEs indicate the intention of the no-self-wrap flag
without changing behavior in this revision.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127590 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-14 16:50:06 +00:00
Dan Gohman
4ce32db913 Make SCEV::getType() and SCEV::print non-virtual. Move SCEV::hasOperand
to ScalarEvolution. Delete SCEV::~SCEV. SCEV is no longer virtual.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119578 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-17 22:27:42 +00:00
Dan Gohman
dc0e8fb9f9 Move SCEV::dominates and properlyDominates to ScalarEvolution.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119570 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-17 21:41:58 +00:00
Dan Gohman
17ead4ff4b Move SCEV::isLoopInvariant and hasComputableLoopEvolution to be member
functions of ScalarEvolution, in preparation for memoization and
other optimizations.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119562 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-17 21:23:15 +00:00
Dan Gohman
203a7239ae Verify SCEVAddRecExpr's invariant in ScalarEvolution::getAddRecExpr
instead of in SCEVAddRecExpr's constructor, in preparation for an
upcoming change.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119554 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-17 20:48:38 +00:00
Dan Gohman
7d0e3c01f3 Revert r111031. The way LLVM defines loop invariance, the property of an
expression being loop invariant is not equivalent to the property of
properly dominating the loop header.

Other optimizations have also made this optimization less important.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111160 91177308-0d34-0410-b5e6-96231b3b80d8
2010-08-16 17:34:25 +00:00
Dan Gohman
2f199f9952 Move SCEVNAryExpr's virtual member functions out of line, and convert
them to iterators.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111140 91177308-0d34-0410-b5e6-96231b3b80d8
2010-08-16 16:21:27 +00:00
Dan Gohman
ef0bedaba7 Implement hasComputableLoopEvolution for Add, Mul, and Trunc operators,
since they can support trivial implementations. This avoids potentially
expensive traversals of the operands.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111031 91177308-0d34-0410-b5e6-96231b3b80d8
2010-08-13 20:03:15 +00:00
Dan Gohman
ab37f50838 Make SCEVUnknown a CallbackVH, so that it can be notified directly
of Value deletions and RAUWs, instead of relying on ScalarEvolution's
Scalars map being notified, as that's complicated at best, and
insufficient in general.

This means SCEVUnknown needs a non-trivial destructor, so introduce
a mechanism to allow ScalarEvolution to locate all the SCEVUnknowns.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110086 91177308-0d34-0410-b5e6-96231b3b80d8
2010-08-02 23:49:30 +00:00
Eric Christopher
e6cbfa6b09 Speculatively revert r109705 since it seems to be causing some build bot
angst.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109718 91177308-0d34-0410-b5e6-96231b3b80d8
2010-07-29 01:25:38 +00:00
Dan Gohman
c6743207e2 Factor out some of the code for updating old SCEVUnknown values, and
extend it to handle the case where multiple RAUWs affect a single
SCEVUnknown.

Add a ScalarEvolution unittest to test for this situation.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109705 91177308-0d34-0410-b5e6-96231b3b80d8
2010-07-29 00:17:55 +00:00
Dan Gohman
dc7a235363 Add some extra friend declarations to fix a gcc-4.0 compile error.
This is a temporary fix, until more elaborate changes are ready.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109593 91177308-0d34-0410-b5e6-96231b3b80d8
2010-07-28 17:09:24 +00:00
Dan Gohman
f374ba2bcd Add a comment.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109565 91177308-0d34-0410-b5e6-96231b3b80d8
2010-07-28 00:21:18 +00:00
Dan Gohman
3bf63768e5 Revert r106304 (105548 and friends), which are the SCEVComplexityCompare
optimizations. There is still some nondeterminism remaining.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106306 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-18 19:54:20 +00:00
Dan Gohman
78db186d2d Reapply 105540, 105542, and 105548, and revert r105732.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106304 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-18 19:26:04 +00:00
Evan Cheng
1d451dff63 Revert 105540, 105542, 105544, 105546, and 105548 to unbreak bootstrapping.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105740 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-09 18:59:43 +00:00
Dan Gohman
fd447eff22 The FoldingSet hash data includes pointer values, so it isn't
determinstic. Instead, give SCEV objects an arbitrary sequence
number.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105548 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-07 19:36:14 +00:00
Dan Gohman
c93b4cff89 Add the ability to "intern" FoldingSetNodeID data into a
BumpPtrAllocator-allocated region to allow it to be stored in a more
compact form and to avoid the need for a non-trivial destructor call.

Use this new mechanism in ScalarEvolution instead of
FastFoldingSetNode to avoid leaking memory in the case where a
FoldingSetNodeID uses heap storage, and to reduce overall memory
usage.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98829 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-18 16:16:38 +00:00
Dan Gohman
f9e64729af Reapply r98755 with a thinko which miscompiled gengtype fixed.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98793 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-18 01:17:13 +00:00
Dan Gohman
ebf78f18df Revert 98755, which may be causing trouble.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98762 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-17 19:54:53 +00:00
Dan Gohman
0afc29c3e6 Change SCEVNAryExpr's operand array from a SmallVector to a plain
pointer and length, and allocate the arrays in ScalarEvolution's
BumpPtrAllocator, so that they get released when their owning
SCEV gets released. SCEVs are immutable, so they don't need to worry
about operand array resizing. This fixes a memory leak reported
in PR6637.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98755 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-17 18:51:01 +00:00
Dan Gohman
39125d8ef9 Override dominates and properlyDominates for SCEVAddRecExpr, as a
SCEVAddRecExpr doesn't necessarily dominate blocks merely dominated
by all of its operands. This fixes an abort compiling 403.gcc.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96056 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-13 00:19:39 +00:00
Dan Gohman
c056baed87 Minor code simplification.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95780 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-10 15:54:22 +00:00
Dan Gohman
4f8eea82d8 Generalize target-independent folding rules for sizeof to handle more
cases, and implement target-independent folding rules for alignof and
offsetof. Also, reassociate reassociative operators when it leads to
more folding.

Generalize ScalarEvolution's isOffsetOf to recognize offsetof on
arrays. Rename getAllocSizeExpr to getSizeOfExpr, and getFieldOffsetExpr
to getOffsetOfExpr, for consistency with analagous ConstantExpr routines.

Make the target-dependent folder promote GEP array indices to
pointer-sized integers, to make implicit casting explicit and exposed
to subsequent folding.

And add a bunch of testcases for this new functionality, and a bunch
of related existing functionality.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94987 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-01 18:27:38 +00:00
Dan Gohman
0f5efe5625 Remove SCEVAllocSizeExpr and SCEVFieldOffsetExpr, and in their place
use plain SCEVUnknowns with ConstantExpr::getSizeOf and
ConstantExpr::getOffsetOf constants. This eliminates a bunch of
special-case code.

Also add code for pattern-matching these expressions, for clients that
want to recognize them.

Move ScalarEvolution's logic for expanding array and vector sizeof
expressions into an element count times the element size, to expose
the multiplication to subsequent folding, into the regular constant
folder.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94737 91177308-0d34-0410-b5e6-96231b3b80d8
2010-01-28 02:15:55 +00:00
Dan Gohman
2b98bd23cb Make SCEVAddRecExpr's getType return a pointer type when the add
has a pointer member. This helps reduce unnecessary bitcasting
and uglygeps.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93939 91177308-0d34-0410-b5e6-96231b3b80d8
2010-01-19 22:53:50 +00:00
Dan Gohman
3645b01002 Add the ability to track HasNSW and HasNUW on more kinds of SCEV expressions.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83601 91177308-0d34-0410-b5e6-96231b3b80d8
2009-10-09 00:10:36 +00:00
Dan Gohman
6e70e31810 Add a properlyDominates member function to ScalarEvolution.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82898 91177308-0d34-0410-b5e6-96231b3b80d8
2009-09-27 15:26:03 +00:00
Dan Gohman
75144f93eb Fix apostrophos.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81856 91177308-0d34-0410-b5e6-96231b3b80d8
2009-09-15 15:08:33 +00:00
Dan Gohman
5078f84c82 Rename hasNoUnsignedOverflow and hasNoSignedOverflow to hasNoUnsignedWrap
and hasNoSignedWrap, for consistency with the nuw and nsw properties.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79539 91177308-0d34-0410-b5e6-96231b3b80d8
2009-08-20 17:11:38 +00:00
Dan Gohman
c40f17b087 Generalize ScalarEvolution to be able to analyze GEPs when
TargetData is not present. It still uses TargetData when available.
This generalization also fixed some limitations in the TargetData
case; the attached testcase covers this.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79344 91177308-0d34-0410-b5e6-96231b3b80d8
2009-08-18 16:46:41 +00:00
Dan Gohman
fef8bb24de Instead of eagerly creating new SCEVs to replace all SCEVs that are
affected after a PHI node has been analyzed, just remove affected
SCEVs from the Scalars map, so that they'll be (lazily) recreated as
needed. This avoids creating SCEV objects that aren't actually needed.

Also, rewrite the associated def-use walking code to be non-recursive
and to continue traversing past Instructions that don't have an
entry in the Scalars map.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77032 91177308-0d34-0410-b5e6-96231b3b80d8
2009-07-25 01:13:03 +00:00
Dan Gohman
d3ff304557 Give SCEVAddRecExpr no-signed-overflow and no-unsigned-overflow flags.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76928 91177308-0d34-0410-b5e6-96231b3b80d8
2009-07-24 01:01:06 +00:00
Torok Edwin
c23197a26f llvm_unreachable->llvm_unreachable(0), LLVM_UNREACHABLE->llvm_unreachable.
This adds location info for all llvm_unreachable calls (which is a macro now) in
!NDEBUG builds.
In NDEBUG builds location info and the message is off (it only prints
"UREACHABLE executed").


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75640 91177308-0d34-0410-b5e6-96231b3b80d8
2009-07-14 16:55:14 +00:00
Dan Gohman
c050fd94c2 Convert SCEV from FoldingSetNode to FastFoldingSetNode. This eliminates
a bunch of redundent code in Profile methods, and prepares for upcoming
changes to do improved memoization.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75494 91177308-0d34-0410-b5e6-96231b3b80d8
2009-07-13 20:50:19 +00:00
Nick Lewycky
d0cca24150 Revert r75252 which was causing some crashes at compile time.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75384 91177308-0d34-0410-b5e6-96231b3b80d8
2009-07-11 20:38:25 +00:00
Torok Edwin
c25e7581b9 assert(0) -> LLVM_UNREACHABLE.
Make llvm_unreachable take an optional string, thus moving the cerr<< out of
line.
LLVM_UNREACHABLE is now a simple wrapper that makes the message go away for
NDEBUG builds.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75379 91177308-0d34-0410-b5e6-96231b3b80d8
2009-07-11 20:10:48 +00:00
Dan Gohman
1b342583f6 Generalize ScalarEvolution's cast-folding code to support more kinds
of loops. Add several new functions to for working with ScalarEvolution's
add-hoc value-range analysis functionality.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75252 91177308-0d34-0410-b5e6-96231b3b80d8
2009-07-10 16:42:52 +00:00
Dan Gohman
0bba49cebc Change all SCEV* to SCEV *.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74918 91177308-0d34-0410-b5e6-96231b3b80d8
2009-07-07 17:06:11 +00:00
Dan Gohman
1c34375f79 Convert ScalarEvolution to use BumpPtrAllocator and FoldingSet, instead
of a team of individual allocations and a team of std::maps.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74393 91177308-0d34-0410-b5e6-96231b3b80d8
2009-06-27 21:21:31 +00:00
Owen Anderson
753ad615f9 Remove the parent pointer from SCEV, since it did not end up being needed.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73907 91177308-0d34-0410-b5e6-96231b3b80d8
2009-06-22 21:57:23 +00:00
Owen Anderson
372b46cad9 SCEVHandle is no more!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73906 91177308-0d34-0410-b5e6-96231b3b80d8
2009-06-22 21:39:50 +00:00
Owen Anderson
08367b6163 Banish global state from ScalarEvolution! SCEV uniquing is now done by tables attached to the ScalarEvolution pass.
This also throws out the SCEV reference counting scheme, as the the SCEVs now have a lifetime controlled by the
ScalarEvolution pass.

Note that SCEVHandle is now a no-op, and will be remove in a future commit.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73892 91177308-0d34-0410-b5e6-96231b3b80d8
2009-06-22 18:25:46 +00:00
Owen Anderson
4a7893b452 Add a parent pointer to SCEV, in preparation for getting rid of the global uniquing tables. No functionality change.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73728 91177308-0d34-0410-b5e6-96231b3b80d8
2009-06-18 22:25:12 +00:00
Dan Gohman
a82752c9eb Convert several parts of the ScalarEvolution framework to use
SmallVector instead of std::vector.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73357 91177308-0d34-0410-b5e6-96231b3b80d8
2009-06-14 22:47:23 +00:00
Dan Gohman
014d53595c Delete an unnecessary forward declaration.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72740 91177308-0d34-0410-b5e6-96231b3b80d8
2009-06-02 21:37:43 +00:00
Dan Gohman
d9480d0f68 Give SCEVNaryExpr a doxygen comment.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72423 91177308-0d34-0410-b5e6-96231b3b80d8
2009-05-26 17:42:32 +00:00
Dan Gohman
3959223330 Update a comment to reflect changes in the surrounding code.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72051 91177308-0d34-0410-b5e6-96231b3b80d8
2009-05-18 22:15:25 +00:00
Dan Gohman
ecb403a9d3 Factor out a common base class between SCEVCommutativeExpr and
SCEVAddRecExpr. This eliminates redundant code for visiting
all the operands of an expression.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71157 91177308-0d34-0410-b5e6-96231b3b80d8
2009-05-07 14:00:19 +00:00
Dan Gohman
1e59aa1332 Add some more doxygen comments to SCEVAddRec.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70354 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-29 00:59:03 +00:00