a7b68d6d95
Fix LSR to keep the RegUseTracker up to date when combining users.
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This doesn't usually matter, because the other heuristics usually
succeed regardless, but it's good to keep the register use
bookkeeping consistent.
llvm-svn: 116005
2010-10-07 23:33:43 +00:00
df7a4f2515
Now with fewer extraneous semicolons!
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llvm-svn: 115996
2010-10-07 22:25:06 +00:00
16ef49686c
Delete an unused function.
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llvm-svn: 114841
2010-09-27 16:58:21 +00:00
a06741b356
do not rely on the implicit-dereference semantics of dyn_cast_or_null
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llvm-svn: 114278
2010-09-18 11:55:34 +00:00
110ed64fbb
Revert 112442 and 112440 until the compile time problems introduced
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by 112440 are resolved.
llvm-svn: 112692
2010-09-01 01:45:53 +00:00
002ff89cbd
Optionally rerun dedicated-register filtering after applying
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other filtering techniques, as those may allow it to filter
out more obviously unprofitable candidates.
llvm-svn: 112441
2010-08-29 16:39:22 +00:00
f031792cc6
Fix several areas in LSR to do a better job keeping the main
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LSRInstance data structures up to date. This fixes some
pessimizations caused by stale data which will be exposed
in an upcoming change.
llvm-svn: 112440
2010-08-29 16:32:54 +00:00
e9e0873b08
Refactor the three main groups of code out of
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NarrowSearchSpaceUsingHeuristics into separate functions.
llvm-svn: 112439
2010-08-29 16:09:42 +00:00
37a0f68036
Delete a bogus check.
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llvm-svn: 112438
2010-08-29 15:30:29 +00:00
b6a520d63c
Add some comments.
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llvm-svn: 112437
2010-08-29 15:27:08 +00:00
bf673e0652
Move this debug output into GenerateAllReuseFormula, to declutter
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the high-level logic.
llvm-svn: 112436
2010-08-29 15:21:38 +00:00
d366b6d5c8
Delete an unused declaration.
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llvm-svn: 112435
2010-08-29 15:19:11 +00:00
4f13bbfefc
Do one lookup instead of two.
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llvm-svn: 112434
2010-08-29 15:18:49 +00:00
129a816ee6
Process the step before the start, because it's usually the simpler
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of the two.
llvm-svn: 111495
2010-08-19 01:02:31 +00:00
89fdbaf99a
Instead of having CollectSubexpr's categorize operands as interesting or
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uninteresting, just put all the operands on one list and make
GenerateReassociations make the decision about what's interesting.
This is simpler, and it avoids an extra ScalarEvolution::getAddExpr call.
llvm-svn: 111133
2010-08-16 15:50:00 +00:00
9b7632df26
Put add operands in ScalarEvolution-canonical order, when convenient.
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This isn't necessary, because ScalarEvolution sorts them anyway,
but it's tidier this way.
llvm-svn: 111132
2010-08-16 15:39:27 +00:00
081ffcd00b
Fix LSR's ExtractImmediate and ExtractSymbol to avoid calling
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ScalarEvolution::getAddExpr, which can be pretty expensive, when nothing
has changed, which is pretty common.
llvm-svn: 111042
2010-08-13 21:17:19 +00:00
a7aed18624
Reapply r110396, with fixes to appease the Linux buildbot gods.
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llvm-svn: 110460
2010-08-06 18:33:48 +00:00
bda59bd247
Revert r110396 to fix buildbots.
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llvm-svn: 110410
2010-08-06 00:23:35 +00:00
755aceb5d0
Don't use PassInfo* as a type identifier for passes. Instead, use the address of the static
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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
ba81fc16a5
Fix whitespace.
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llvm-svn: 110223
2010-08-04 17:43:57 +00:00
40b31ad3ee
Prefix `next' iterator operation with `llvm::'.
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Fixes potential ambiguity problems on VS 2010.
Patch by nobled!
llvm-svn: 110029
2010-08-02 06:00:15 +00:00
a57b97e7e7
Fix batch of converting RegisterPass<> to INTIALIZE_PASS().
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llvm-svn: 109045
2010-07-21 22:09:45 +00:00
1415208292
Don't merge uses when they are targetting fixup sites with
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different widths. In a use with a narrower fixup, formulae
may be wider than the fixup, in which case the high bits
aren't necessarily meaningful, so it isn't safe to reuse
them for uses with wider fixups.
This fixes PR7618, though the testcase is too large for a
reasonable regression test, since it heavily dependes on
hitting LSR's heuristics in a certain way.
llvm-svn: 108455
2010-07-15 20:24:58 +00:00
a1501b9c50
Use dbgs() instead of errs() in a DEBUG.
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llvm-svn: 108453
2010-07-15 20:12:42 +00:00
4afd412d6b
Watch out for a constant offset cancelling out a base register, forming
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a zero. This situation arrises in Fortran code with induction variables
that start at 1 instead of 0. This fixes PR7651.
llvm-svn: 108424
2010-07-15 15:14:45 +00:00
8ae3095286
use getArgOperand instead of getOperand
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llvm-svn: 107270
2010-06-30 09:15:28 +00:00
fb9712bdae
In GenerateReassociations, don't bother thinking about individual
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SCEVUnknown values which are loop-variant, as LSR can't do anything
interesting with these values in any case. This fixes very slow compile
times on loops which have large numbers of such values.
llvm-svn: 106897
2010-06-25 22:32:18 +00:00
963b1c142e
A few minor micro-optimizations.
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llvm-svn: 106764
2010-06-24 16:57:52 +00:00
47ddf76d89
Teach getExactSDiv to evaluate x/1 to x up front, as it's a common
...
enough special case, and it theoretically allows more folding because
it works even when x is unanalyzable.
llvm-svn: 106763
2010-06-24 16:51:25 +00:00
ab5422200b
Fix copy+pasto issues in isMulSExtable.
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llvm-svn: 106759
2010-06-24 16:45:11 +00:00
1081f1a0f5
Fix OptimizeMax to handle an odd case where one of the max operands
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is another max which folds. This fixes PR7454.
llvm-svn: 106594
2010-06-22 23:07:13 +00:00
dd41bba517
Use A.append(...) instead of A.insert(A.end(), ...) when A is a
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SmallVector, and other SmallVector simplifications.
llvm-svn: 106452
2010-06-21 19:47:52 +00:00
32655906e4
Add a TODO comment.
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llvm-svn: 106397
2010-06-19 21:30:18 +00:00
51d00092b6
Include the use kind along with the expression in the key of the
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use sharing map. The reconcileNewOffset logic already forces a
separate use if the kinds differ, so incorporating the kind in the
key means we can track more sharing opportunities.
More sharing means fewer total uses to track, which means smaller
problem sizes, which means the conservative throttles don't kick
in as often.
llvm-svn: 106396
2010-06-19 21:29:59 +00:00
297fb8b9fc
Don't include things in anonymous namespaces that don't need it.
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llvm-svn: 106395
2010-06-19 21:21:39 +00:00
67b4403101
Don't track users of undef values; they aren't interesting for
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register pressure.
llvm-svn: 105501
2010-06-04 23:16:05 +00:00
9b48b856ea
DominatorTree.getNode can return null for unreachable blocks.
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llvm-svn: 104290
2010-05-20 22:46:54 +00:00
86110fa2bb
Minor code cleanups.
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llvm-svn: 104287
2010-05-20 22:25:20 +00:00
6295f2ebb8
Make Solve check its own post-condition, to reduce clutter in the
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top-level LSRInstance logic.
llvm-svn: 104278
2010-05-20 20:59:23 +00:00
a4ca28a3ae
Add comments.
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llvm-svn: 104276
2010-05-20 20:52:00 +00:00
927bcaadda
More code cleanups. Use iterators instead of indices when indices
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aren't needed.
llvm-svn: 104273
2010-05-20 20:33:18 +00:00
4c4043cf34
Fix OptimizeShadowIV to set Changed. Change OptimizeLoopTermCond to set
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Changed directly instead of using a return value.
Rename FilterOutUndesirableDedicatedRegisters's Changed variable to
distinguish it from LSRInstance's Changed member.
llvm-svn: 104269
2010-05-20 20:05:31 +00:00
8ec018cedf
Add some comments.
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llvm-svn: 104268
2010-05-20 20:00:41 +00:00
8ce95cc3c5
Simplify this code. Don't do a DomTreeNode lookup for each visited block.
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llvm-svn: 104267
2010-05-20 20:00:25 +00:00
ab5fb7f559
Minor code cleanups.
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llvm-svn: 104263
2010-05-20 19:44:23 +00:00
ee2fea3cd7
When canonicalizing icmp operand order to put the loop invariant
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operand on the left, the interesting operand is on the right. This
fixes a bug where LSR was failing to recognize ICmpZero uses,
which led it to be unable to reverse the induction variable in the
attached testcase.
Delete test/CodeGen/X86/stack-color-with-reg-2.ll, because its test
is extremely fragile and hard to meaningfully update.
llvm-svn: 104262
2010-05-20 19:26:52 +00:00
fdf9874ba7
Set Changed to true when canonicalizing ICmp operand order; even though
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it isn't a very interesting change, it's a change nonetheless.
llvm-svn: 104260
2010-05-20 19:16:03 +00:00
981563d0ba
Rename a variable to avoid shadowing.
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llvm-svn: 104234
2010-05-20 16:41:11 +00:00
6b733fc189
Minor code simplification.
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llvm-svn: 104232
2010-05-20 16:23:28 +00:00
Dan Gohman