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584 Commits

Author SHA1 Message Date
Dan Gohman
f29618236e Micro-optimize SCEVConstant comparison. 
llvm-svn: 111142
 2010-08-16 16:25:35 +00:00
Dan Gohman
3688ea5c7d Move SCEVNAryExpr's virtual member functions out of line, and convert 
them to iterators.

llvm-svn: 111140
 2010-08-16 16:21:27 +00:00
Dan Gohman
d6925bbe0d Use iterators instead of indices in simple cases. 
llvm-svn: 111138
 2010-08-16 16:16:11 +00:00
Dan Gohman
b6c773ec2e Avoid gratuitous inefficiency in ifndef NDEBUG code. 
llvm-svn: 111137
 2010-08-16 16:13:54 +00:00
Dan Gohman
e5fb1036e6 Make one getAddExpr call when analyzing a+b+c+d+e+... instead of one 
for each add instruction. Ditto for Mul.

llvm-svn: 111136
 2010-08-16 16:03:49 +00:00
Dan Gohman
b094b39111 Delete an unused function. 
llvm-svn: 111135
 2010-08-16 15:57:14 +00:00
Dan Gohman
0c436ab356 Various optimizations. Don't compare two loops' depths 
when they are the same loop. Don't compare two instructions'
loop depths when they are in the same block.

llvm-svn: 111045
 2010-08-13 21:24:58 +00:00
Dan Gohman
63c020a210 When testing whether one loop contains another, test this directly 
rather than testing whether the loop contains the other's header.

llvm-svn: 111039
 2010-08-13 20:23:25 +00:00
Dan Gohman
3324b9ec67 Add a const. 
llvm-svn: 111038
 2010-08-13 20:17:27 +00:00
Dan Gohman
cf32f2bde1 When creating a symmetric SCEV with a constant operand, put 
the constant operand on the left, as that's where ScalarEvolution
will end up canonicalizing to.

llvm-svn: 111037
 2010-08-13 20:17:14 +00:00
Dan Gohman
ec0120a123 An add recurrence is loop-invariant in any loop inside of its 
associated loop. This avoids potentially expensive traversals
of the add recurrence's operands.

llvm-svn: 111034
 2010-08-13 20:11:39 +00:00
Dan Gohman
2de47777f4 Optimize ScalarEvolution::getAddExpr's operand factoring code by 
having it finish processing all of the muliply operands before
starting the whole getAddExpr process over again, instead of
immediately after the first simplification.

llvm-svn: 110916
 2010-08-12 15:00:23 +00:00
Dan Gohman
157847f5d1 Hoist some loop-invariant code out of a hot loop. 
llvm-svn: 110915
 2010-08-12 14:52:55 +00:00
Dan Gohman
e67b287451 Optimize ScalarEvolution::getAddExpr's duplicate operand detection 
by having it finish processing the whole operand list before
starting the whole getAddExpr process over again, instead of
immediately after the first duplicate is found.

llvm-svn: 110914
 2010-08-12 14:46:54 +00:00
Dan Gohman
f7495f286a When analyzing loop exit conditions combined with and and or, don't 
make any assumptions about when the two conditions will agree on when
to permit the loop to exit. This fixes PR7845.

llvm-svn: 110758
 2010-08-11 00:12:36 +00:00
Dan Gohman
e18c2d6f99 Rename and reorder the arguments to isImpliedCond, for consistency and clarity. 
llvm-svn: 110750
 2010-08-10 23:46:30 +00:00
Owen Anderson
a7aed18624 Reapply r110396, with fixes to appease the Linux buildbot gods. 
llvm-svn: 110460
 2010-08-06 18:33:48 +00:00
Owen Anderson
bda59bd247 Revert r110396 to fix buildbots. 
llvm-svn: 110410
 2010-08-06 00:23:35 +00:00
Owen Anderson
755aceb5d0 Don't use PassInfo* as a type identifier for passes. Instead, use the address of the static 
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
Dan Gohman
db764c6e3b Fix a minor bug which resulted in intermediate calculations 
using wider types than are necessary.

llvm-svn: 110241
 2010-08-04 19:52:50 +00:00
Dan Gohman
7cac95778f 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.

llvm-svn: 110086
 2010-08-02 23:49:30 +00:00
Oscar Fuentes
40b31ad3ee Prefix next' iterator operation with llvm::'. 
Fixes potential ambiguity problems on VS 2010.

Patch by nobled!

llvm-svn: 110029
 2010-08-02 06:00:15 +00:00
Eric Christopher
ef6d5933a6 Speculatively revert r109705 since it seems to be causing some build bot 
angst.

llvm-svn: 109718
 2010-07-29 01:25:38 +00:00
Dan Gohman
3d6ac44d96 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.

llvm-svn: 109705
 2010-07-29 00:17:55 +00:00
Dan Gohman
7a066723d0 Make SCEVCallbackVH::allUsesReplacedWith update the old SCEVUnknown 
object, as it may still be referenced by SCEVs not cleaned up by the
use list traversal.

Also, in ScalarEvolution::forgetValue, only check for a SCEVUnknown
object for the original value, not for any value in the use list,
because other SCEVUnknown values aren't necessary obsolete at that
point.

llvm-svn: 109570
 2010-07-28 01:09:07 +00:00
Dan Gohman
8aeb0fb5ca Make SCEVCallbackVH::allUsesReplacedWith unconditionally delete 
the old value.

llvm-svn: 109567
 2010-07-28 00:28:25 +00:00
Dan Gohman
5ae3102459 Micro-optimize SCEVComplexityCompare. 
llvm-svn: 109267
 2010-07-23 21:20:52 +00:00
Dan Gohman
992db006d0 Add a const qualifier. 
llvm-svn: 109266
 2010-07-23 21:18:55 +00:00
Gabor Greif
dde79d8f1a mass elimination of reliance on automatic iterator dereferencing 
llvm-svn: 109103
 2010-07-22 13:36:47 +00:00
Owen Anderson
a57b97e7e7 Fix batch of converting RegisterPass<> to INTIALIZE_PASS(). 
llvm-svn: 109045
 2010-07-21 22:09:45 +00:00
Dan Gohman
46f00a25f9 Add a fast path for x - x. 
llvm-svn: 108855
 2010-07-20 16:53:00 +00:00
Dan Gohman
64b1e82a7c Teach ScalarEvolution how to fold trunc(undef) and anyext(undef) to undef. 
This helps LSR behave more consistently on bugpoint-reduced testcases.

llvm-svn: 108451
 2010-07-15 20:02:11 +00:00
Dan Gohman
f638f4ff84 In ScalarEvolution::forgetValue, eliminate any SCEVUnknown 
entries associated with the value being erased in the
folding set map.  These entries used to be harmless, because
a SCEVUnknown doesn't store any information about its Value*,
so having a new Value allocated at the old Value's address
wasn't a problem. But now that ScalarEvolution is storing more
information about values, this is no longer safe.

llvm-svn: 107316
 2010-06-30 20:21:12 +00:00
Dan Gohman
c0cca7fdda Revert the part of r107257 which introduced new logic for using 
nsw and nuw flags from IR Instructions. On further consideration,
this isn't valid.

llvm-svn: 107298
 2010-06-30 17:27:11 +00:00
Dan Gohman
16206132b6 Improve ScalarEvolution's nsw and nuw preservation. 
llvm-svn: 107257
 2010-06-30 07:16:37 +00:00
Dan Gohman
9396b42ca4 When computing a new ConservativeResult, intersect it with 
the old one instead of replacing it, to be more precise.

llvm-svn: 107256
 2010-06-30 06:58:35 +00:00
Dan Gohman
ae36b1ed42 Fix ScalarEvolution's tripcount computation for chains of loops 
where each loop's induction variable's start value is the exit
value of a preceding loop.

llvm-svn: 107224
 2010-06-29 23:43:06 +00:00
Dan Gohman
90db61d638 Just as its not safe to blindly transfer the nsw bit from an add 
instruction to an add scev, it's not safe to blindly transfer the
inbounds flag from a gep instruction to an nsw on the scev for the
gep.

llvm-svn: 107117
 2010-06-29 01:41:41 +00:00
Dan Gohman
89dd42af31 Eliminate a redundant FoldingSet lookup. 
llvm-svn: 106872
 2010-06-25 18:47:08 +00:00
Dan Gohman
5235cc2c25 Don't try to preserve pointer types in SCEVConstants; the old code 
was over-complicated.

llvm-svn: 106760
 2010-06-24 16:47:03 +00:00
Dan Gohman
3ace9f4e3d Make the trunc code consistent with the zext and sext code in its 
handling of pointer types.

llvm-svn: 106757
 2010-06-24 16:33:38 +00:00
Dan Gohman
75c6b0bb1f Replace ScalarEvolution's private copy of getLoopPredecessor 
with LoopInfo's public copy.

llvm-svn: 106603
 2010-06-22 23:43:28 +00:00
Dan Gohman
f820bd327d Allow "exhaustive" trip count evaluation on phi nodes with all 
constant operands.

llvm-svn: 106537
 2010-06-22 13:15:46 +00:00
Dan Gohman
dd41bba517 Use A.append(...) instead of A.insert(A.end(), ...) when A is a 
SmallVector, and other SmallVector simplifications.

llvm-svn: 106452
 2010-06-21 19:47:52 +00:00
Dan Gohman
866971ed3d Fix ScalarEvolution's "exhaustive" trip count evaluation code to avoid 
assuming that loops are in canonical form, as ScalarEvolution doesn't
depend on LoopSimplify itself. Also, with indirectbr not all loops can
be simplified. This fixes PR7416.

llvm-svn: 106389
 2010-06-19 14:17:24 +00:00
Dan Gohman
24ceda8eb0 Revert r106304 (105548 and friends), which are the SCEVComplexityCompare 
optimizations. There is still some nondeterminism remaining.

llvm-svn: 106306
 2010-06-18 19:54:20 +00:00
Dan Gohman
4c807fca97 Reapply 105540, 105542, and 105548, and revert r105732. 
llvm-svn: 106304
 2010-06-18 19:26:04 +00:00
Dan Gohman
45073042eb Reapply 105546. 
llvm-svn: 106302
 2010-06-18 19:12:32 +00:00
Dan Gohman
9136d9fbf8 Reapply 105544. 
llvm-svn: 106301
 2010-06-18 19:09:27 +00:00
Dan Gohman
3d8a9d7490 Remove getIntegerSCEV; it's redundant with getConstant, and getConstant 
is more consistent with the ConstantInt API.

llvm-svn: 106281
 2010-06-18 14:33:50 +00:00
Dan Gohman
8f5954f42c Simplify this code. 
llvm-svn: 106254
 2010-06-17 23:34:09 +00:00
Evan Cheng
ae83e1f5cb Revert 105540, 105542, 105544, 105546, and 105548 to unbreak bootstrapping. 
llvm-svn: 105740
 2010-06-09 18:59:43 +00:00
Dan Gohman
ebf2e977cf The FoldingSet hash data includes pointer values, so it isn't 
determinstic. Instead, give SCEV objects an arbitrary sequence
number.

llvm-svn: 105548
 2010-06-07 19:36:14 +00:00
Dan Gohman
3553feed79 Optimize this code somewhat by taking advantage of the fact 
that the operands are sorted.

llvm-svn: 105546
 2010-06-07 19:20:57 +00:00
Dan Gohman
a2effb6452 Micro-optimize this, to speed up this hotspot in debug builds a little. 
llvm-svn: 105544
 2010-06-07 19:16:37 +00:00
Dan Gohman
18a4b46404 Micro-optimize this. 
llvm-svn: 105542
 2010-06-07 19:12:54 +00:00
Dan Gohman
70910a6ab6 Optimize ScalarEvolution's SCEVComplexityCompare predicate: don't go 
scrounging through SCEVUnknown contents and SCEVNAryExpr operands;
instead just do a simple deterministic comparison of the precomputed
hash data.

Also, since this is more precise, it eliminates the need for the slow
N^2 duplicate detection code.

llvm-svn: 105540
 2010-06-07 19:06:13 +00:00
Dan Gohman
a3b6c4b529 ConstantFoldConstantExpression can theoretically return null. 
llvm-svn: 104948
 2010-05-28 16:12:08 +00:00
Dan Gohman
70a3b12193 Use the SCEVAddRecExpr::getPostIncExpr utility function instead 
of doing the same thing manually.

llvm-svn: 102997
 2010-05-04 01:12:27 +00:00
Dan Gohman
5f18c547da Fix a copy+pasto. 
llvm-svn: 102996
 2010-05-04 01:11:15 +00:00
Dan Gohman
1d2ded75e2 Use getConstant instead of getIntegerSCEV. The two are basically the 
same, now that getConstant has overloads consistent with ConstantInt::get.

llvm-svn: 102965
 2010-05-03 22:09:21 +00:00
Dan Gohman
267700c5aa Silence warnings about -1 being converted to an unsigned value. 
Also, pass true for isSigned even when creating constants for unsigned
comparisons, because the point is to create an all-ones constant,
rather than UINT64_MAX, even for integers wider than 64 bits.

llvm-svn: 102946
 2010-05-03 20:23:47 +00:00
Dan Gohman
b5025c72eb Use isTrueWhenEqual and isFalseWhenEqual instead of assuming that 
SimplifyICmpOperands will simplify such cases to EQ or NE. This makes
the correcntess of the code independent on SimplifyICmpOperands doing
certain simplifications.

llvm-svn: 102927
 2010-05-03 18:00:24 +00:00
Dan Gohman
d18dc2c876 In ScalarEvolution::print, don't bother printing out the SCEVs for 
comparison instructions, since they aren't interesting, despite having
integer result types.

llvm-svn: 102925
 2010-05-03 17:03:23 +00:00
Dan Gohman
df564cacaf In SimplifyICmpOperands, avoid needlessly swapping the operands in the 
case where both are addrecs in unrelated loops.

llvm-svn: 102924
 2010-05-03 17:00:11 +00:00
Dan Gohman
81585c18e1 Factor out the new <= and >= analysis code into SimplifyICmpOperands. 
llvm-svn: 102922
 2010-05-03 16:35:17 +00:00
Dan Gohman
a0a8a7fe40 Set isSigned to true when creating an all-ones integer constant, even 
for unsigned purposes, so >64-bit integer values get a full all-ones
value.

llvm-svn: 102739
 2010-04-30 19:22:39 +00:00
Dan Gohman
1c07852e17 Silence compiler warnings. 
llvm-svn: 102734
 2010-04-30 19:21:13 +00:00
Dan Gohman
f33bac3afe ScalarEvolution support for <= and >= loops. 
Also, generalize ScalarEvolutions's min and max recognition to handle
some new forms of min and max that this change makes more common.

llvm-svn: 102234
 2010-04-24 03:09:42 +00:00
Dan Gohman
36cce7e0dd Use SimplifyICmpOperands in isKnownPredicate too. 
llvm-svn: 102233
 2010-04-24 01:38:36 +00:00
Dan Gohman
3673aa1a51 Update isImpliedCond to use the new SimplifyICmpOperands utility. 
llvm-svn: 102232
 2010-04-24 01:34:53 +00:00
Dan Gohman
48ff3cf63b Add a new utility function SimplifyICmpOperands. Much of this code is 
refactored out of ScalarEvolution::isImpliedCond, which will be updated
to use this new utility routine soon.

llvm-svn: 102229
 2010-04-24 01:28:42 +00:00
Dan Gohman
ff3174e97f When it doesn't matter whether zero or sign extension is used, 
use ScalarEvolutions "any" extend function.

llvm-svn: 102156
 2010-04-23 01:51:29 +00:00
Dan Gohman
acd700a24b Don't attempt to analyze values which are obviously undef. This fixes some 
assertion failures in extreme cases.

llvm-svn: 102042
 2010-04-22 01:35:11 +00:00
Dan Gohman
a029cbe93f Make ScalarEvolution::getConstant support pointer types, for consistency 
with ScalarEvolution's overall approach to pointer types.

llvm-svn: 102003
 2010-04-21 16:04:04 +00:00
Dan Gohman
12293815de Fix SCEVCommutativeExpr::print to be robust in the case of improper 
expression canonicalization. Its job is to print what's there, not to
make judgements about it.

llvm-svn: 101461
 2010-04-16 15:03:25 +00:00
Dan Gohman
4e3c1139a2 Make getPredecessorWithUniqueSuccessorForBB return the unique successor 
in addition to the predecessor.

llvm-svn: 101374
 2010-04-15 16:19:08 +00:00
Dan Gohman
65de3d140d Add a comment. 
llvm-svn: 101248
 2010-04-14 16:08:56 +00:00
Dan Gohman
7ef0dc2163 Teach ScalarEvolution to simplify smax and umax when it can prove 
that one operand is always greater than another.

llvm-svn: 101142
 2010-04-13 16:51:03 +00:00
Dan Gohman
fe4b29180b Minor code micro-optimizations. 
llvm-svn: 101141
 2010-04-13 16:49:23 +00:00
Dan Gohman
ebbd05f8ce Micro-optimize a few hot spots. 
llvm-svn: 101086
 2010-04-12 23:08:18 +00:00
Dan Gohman
11862a6ed3 Add fast paths to ScalarEvolution::getSizeOf and getOffsetOf, as 
they're used a lot by getNodeForGEP, which can be called a lot.
This speeds up -iv-users by around 15% on several testcases.

llvm-svn: 101083
 2010-04-12 23:03:26 +00:00
Dan Gohman
6635bb26a6 Generalize ScalarEvolution's PHI analysis to handle loops that don't 
have preheaders or dedicated exit blocks, as clients may not otherwise
need to run LoopSimplify.

llvm-svn: 101030
 2010-04-12 07:49:36 +00:00
Dan Gohman
f76210ead8 Rewrite the overflow checking in the get{Signed,Unsigned}Range code for 
AddRecs so that it checks for overflow in the computation that it is
performing, rather than just checking hasNo{Signed,Unsigned}Wrap, since
those flags are for a different computation. This fixes a bug that
impacts an upcoming change.

llvm-svn: 101028
 2010-04-12 07:39:33 +00:00
Dan Gohman
068b793614 Fix indentation. 
llvm-svn: 101001
 2010-04-11 23:44:58 +00:00
Dan Gohman
07591698ce Enhance ScalarEvolution::isKnownPredicate with support for 
loop conditions which are invariants.

llvm-svn: 100995
 2010-04-11 22:16:48 +00:00
Dan Gohman
f7f28511a9 Minor code simplification. 
llvm-svn: 100994
 2010-04-11 22:13:11 +00:00
Dan Gohman
ae4a4148ba When creating a ConstantRange for [n,UINT_MAX], special case n == 0, because 
ConstantRange(0, 0) creates an empty range rather than a full one.

llvm-svn: 100993
 2010-04-11 22:12:18 +00:00
Dan Gohman
b50349a979 Rename isLoopGuardedByCond to isLoopEntryGuardedByCond, to emphasise 
that it's only testing for the entry condition, not full loop-invariant
conditions.

llvm-svn: 100979
 2010-04-11 19:27:13 +00:00
Dan Gohman
4ce1fb1448 Add variants of ult, ule, etc. which take a uint64_t RHS, for convenience. 
llvm-svn: 100824
 2010-04-08 23:03:40 +00:00
Dan Gohman
883105485b Revert this change from a while ago; ScalarEvolution shouldn't analyze 
undef as 0, since it can't force other analyses to intepret the undef
in the same way.

llvm-svn: 100749
 2010-04-08 05:58:24 +00:00
Dan Gohman
01c65a2622 Define placement new wrappers for BumpPtrAllocator and 
RecyclingAllocator to allow client code to be simpler, and
simplify several clients.

llvm-svn: 98847
 2010-03-18 18:49:47 +00:00
Dan Gohman
6556c8962c 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.

llvm-svn: 98829
 2010-03-18 16:16:38 +00:00
Dan Gohman
0052449e1a Reapply r98755 with a thinko which miscompiled gengtype fixed. 
llvm-svn: 98793
 2010-03-18 01:17:13 +00:00
Dan Gohman
d2abecaeea Revert 98755, which may be causing trouble. 
llvm-svn: 98762
 2010-03-17 19:54:53 +00:00
Dan Gohman
5c9b0e1a6e 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.

llvm-svn: 98755
 2010-03-17 18:51:01 +00:00
Dan Gohman
69451a0950 Avoid analyzing instructions in blocks not reachable from the entry block. 
They are lots of trouble, and they don't matter. This fixes PR6559.

llvm-svn: 98103
 2010-03-09 23:46:50 +00:00
Dan Gohman
8b0a419eb1 Spelling fixes. 
llvm-svn: 97453
 2010-03-01 17:49:51 +00:00
Dan Gohman
a9c205cc88 Make LoopSimplify change conditional branches in loop exiting blocks 
which branch on undef to branch on a boolean constant for the edge
exiting the loop. This helps ScalarEvolution compute trip counts for
loops.

Teach ScalarEvolution to recognize single-value PHIs, when safe, and
ForgetSymbolicName to forget such single-value PHI nodes as apprpriate
in ForgetSymbolicName.

llvm-svn: 97126
 2010-02-25 06:57:05 +00:00
Dan Gohman
4aad750333 ConstantFoldInstOperands can theoretically return null if it 
didn't fold anything.

llvm-svn: 97049
 2010-02-24 19:31:47 +00:00