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1683 Commits

Author SHA1 Message Date
Jakob Stoklund Olesen
fbbd4abfe5 Fix a non-deterministic loop in llvm::MergeBlockIntoPredecessor. 
DT->changeImmediateDominator() trivially ignores identity updates, so there is
really no need for the uniqueing provided by SmallPtrSet.

I expect this to fix PR8954.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123286 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-01-11 22:54:38 +00:00
Chris Lattner
f73b99ab43 this pass claims to preserve scev, make sure to tell it about deletions. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123247 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-01-11 18:14:50 +00:00
Frits van Bommel
65fdded319 Factor the actual simplification out of SimplifyIndirectBrOnSelect and into a new helper function so it can be reused in e.g. an upcoming SimplifySwitchOnSelect. 
No functional change.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123234 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-01-11 12:52:11 +00:00
Chris Lattner
b6810991a9 when MergeBlockIntoPredecessor merges two blocks, update MemDep if it 
is floating around in the ether.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123223 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-01-11 08:16:49 +00:00
Chris Lattner
b5b7997fd0 Fix FoldSingleEntryPHINodes to update memdep and AA when it deletes 
phi nodes.  It is called from MergeBlockIntoPredecessor which is 
called from GVN, which claims to preserve these.

I'm skeptical that this is the actual problem behind PR8954, but
this is a stab in the right direction.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123222 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-01-11 08:13:40 +00:00
Chris Lattner
b298db7253 random cleanups 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123221 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-01-11 08:00:40 +00:00
Chris Lattner
dc85f8ab80 various code cleanups, enhance MergeBlockIntoPredecessor to preserve 
loop info.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123074 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-01-08 19:08:40 +00:00
Chris Lattner
b0433d4b2f reduce nesting. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123071 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-01-08 18:47:43 +00:00
Cameron Zwarich
80f6a507d4 Make more passes preserve dominators (or state that they preserve dominators if 
they all ready do). This removes two dominator recomputations prior to isel,
which is a 1% improvement in total llc time for 403.gcc.

The only potentially suspect thing is making GCStrategy recompute dominators if
it used a custom lowering strategy.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123064 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-01-08 17:01:52 +00:00
Chris Lattner
b5fa5fcecc Revamp the ValueMapper interfaces in a couple ways: 
1. Take a flags argument instead of a bool.  This makes
   it more clear to the reader what it is used for.
2. Add a flag that says that "remapping a value not in the
   map is ok".
3. Reimplement MapValue to share a bunch of code and be a lot
   more efficient.  For lookup failures, don't drop null values
   into the map.
4. Using the new flag a bunch of code can vaporize in LinkModules
   and LoopUnswitch, kill it.

No functionality change.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123058 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-01-08 08:15:20 +00:00
Jay Foad
8f9ffbd056 Remove all uses of the "ugly" method BranchInst::setUnconditionalDest(). 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123025 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-01-07 20:25:56 +00:00
Duncan Sands
dc615e41b5 Speed up instsimplify by about 10-15% by not bothering to retry 
InstructionSimplify on instructions that didn't change since the
last time round the loop.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122745 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-01-03 10:50:04 +00:00
Chris Lattner
9fc5cdf77c split dom frontier handling stuff out to its own DominanceFrontier header, 
so that Dominators.h is *just* domtree.  Also prune #includes a bit.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122714 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-01-02 22:09:33 +00:00
Duncan Sands
67fb341f8b Fix PR8702 by not having LoopSimplify claim to preserve LCSSA form. As described 
in the PR, the pass could break LCSSA form when inserting preheaders.  It probably
would be easy enough to fix this, but since currently we always go into LCSSA form
after running this pass, doing so is not urgent.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122695 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-01-02 13:38:21 +00:00
Duncan Sands
8a3d29cf10 Simplify this pass by using a depth-first iterator to ensure that all 
operands are visited before the instructions themselves.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122647 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-31 17:49:05 +00:00
Duncan Sands
fea0b8b666 Zap dead instructions harder. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122645 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-31 16:17:54 +00:00
Benjamin Kramer
1928236514 Make a bunch of symbols internal. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122642 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-30 22:34:44 +00:00
Benjamin Kramer
def548f9a0 BuildLibCalls: Nuke EmitMemCpy, EmitMemMove and EmitMemSet. They are dead and superseded by IRBuilder. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122576 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-27 00:25:32 +00:00
Chris Lattner
ae47be1ea0 don't lose TD info 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122556 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-25 20:52:04 +00:00
Chris Lattner
7569d79de1 switch the inliner alignment enforcement stuff to use the 
getOrEnforceKnownAlignment function, which simplifies the code
and makes it stronger.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122555 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-25 20:42:38 +00:00
Chris Lattner
687140c818 Move getOrEnforceKnownAlignment out of instcombine into Transforms/Utils. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122554 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-25 20:37:57 +00:00
Jeffrey Yasskin
8e68c38735 Change all self assignments X=X to (void)X, so that we can turn on a 
new gcc warning that complains on self-assignments and
self-initializations.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122458 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-23 00:58:24 +00:00
Duncan Sands
1cd0f4637b Visit instructions deterministically. Use a FIFO so as to approximately 
visit instructions before their uses, since InstructionSimplify does a
better job in that case.  All this prompted by Frits van Bommel.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122343 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-21 17:08:55 +00:00
Duncan Sands
e95cc25a22 If an instruction simplifies, try again to simplify any uses of it. This is 
not very important since the pass is only used for testing, but it does make
it more realistic.  Suggested by Frits van Bommel.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122336 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-21 16:12:03 +00:00
Duncan Sands
69fdf876e1 Oops, forgot to add the pass itself! 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122265 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-20 21:07:42 +00:00
Duncan Sands
43ff68ded0 Add a new convenience pass for testing InstructionSimplify. Previously 
it could only be tested indirectly, via instcombine, gvn or some other
pass that makes use of InstructionSimplify, which means that testcases
had to be carefully contrived to dance around any other transformations
that that pass did.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122264 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-20 20:54:37 +00:00
Chris Lattner
0b66f63a26 when eliding a byval copy due to inlining a readonly function, we have 
to make sure that the reused alloca has sufficient alignment.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122236 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-20 08:10:40 +00:00
Chris Lattner
e7ae705c32 pull byval processing out to its own helper function. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122235 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-20 07:57:41 +00:00
Chris Lattner
018fb767b9 fix PR8769, a miscompilation by inliner when inlining a function with a byval 
argument.  The generated alloca has to have at least the alignment of the
byval, if not, the client may be making assumptions that the new alloca won't
satisfy.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122234 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-20 07:45:28 +00:00
Chris Lattner
a37029cd24 simplify this a bit. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122156 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-18 20:22:49 +00:00
Benjamin Kramer
14c0987bd9 SimplifyCFG: Ranges can be larger than 64 bits. Fixes Release-selfhost build. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122054 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-17 10:48:14 +00:00
Chris Lattner
e27db74a60 improve switch formation to handle small range 
comparisons formed by comparisons.  For example,
this:

void foo(unsigned x) {
  if (x == 0 || x == 1 || x == 3 || x == 4 || x == 6) 
    bar();
}

compiles into:

_foo:                                   ## @foo
## BB#0:                                ## %entry
	cmpl	$6, %edi
	ja	LBB0_2
## BB#1:                                ## %entry
	movl	%edi, %eax
	movl	$91, %ecx
	btq	%rax, %rcx
	jb	LBB0_3

instead of:

_foo:                                   ## @foo
## BB#0:                                ## %entry
	cmpl	$2, %edi
	jb	LBB0_4
## BB#1:                                ## %switch.early.test
	cmpl	$6, %edi
	ja	LBB0_3
## BB#2:                                ## %switch.early.test
	movl	%edi, %eax
	movl	$88, %ecx
	btq	%rax, %rcx
	jb	LBB0_4

This catches a bunch of cases in GCC, which look like this:

 %804 = load i32* @which_alternative, align 4, !tbaa !0
 %805 = icmp ult i32 %804, 2
 %806 = icmp eq i32 %804, 3
 %or.cond121 = or i1 %805, %806
 %807 = icmp eq i32 %804, 4
 %or.cond124 = or i1 %or.cond121, %807
 br i1 %or.cond124, label %.thread, label %808

turning this into a range comparison.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122045 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-17 06:20:15 +00:00
Chris Lattner
ba3c815570 make qsort predicate more conformant by returning 0 for equal values. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121838 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-15 04:52:41 +00:00
Chris Lattner
3aff13b82a - Insert new instructions before DomBlock's terminator, 
which is simpler than finding a place to insert in BB.
 - Don't perform the 'if condition hoisting' xform on certain
   i1 PHIs, as it interferes with switch formation.

This re-fixes "example 7", without breaking the world hopefully.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121764 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-14 08:46:09 +00:00
Chris Lattner
60d410d7bb fix two significant issues with FoldTwoEntryPHINode: 
first, it can kick in on blocks whose conditions have been
folded to a constant, even though one of the edges will be
trivially folded.

second, it doesn't clean up the "if diamond" that it just 
eliminated away.  This is a problem because other simplifycfg
xforms kick in depending on the order of block visitation,
causing pointless work.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121762 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-14 08:01:53 +00:00
Chris Lattner
071edc81f2 remove the instsimplify logic I added in r121754. It is apparently 
breaking the selfhost builds, though I can't fathom how.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121761 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-14 07:53:03 +00:00
Chris Lattner
44da7ca421 clean up logic, convert std::set to SmallPtrSet, handle the case 
when all 2-entry phis are simplified away.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121760 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-14 07:41:39 +00:00
Chris Lattner
e0b18e5912 tidy up a bit, move DEBUG down to when we commit to doing the transform so we 
don't print it unless the xform happens.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121758 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-14 07:23:10 +00:00
Chris Lattner
07ff3539f5 use SimplifyInstruction instead of reimplementing part of it. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121757 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-14 07:20:29 +00:00
Chris Lattner
995ba1bd49 simplify GetIfCondition by using getSinglePredecessor. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121756 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-14 07:15:21 +00:00
Chris Lattner
6de0a28dfb use AddPredecessorToBlock in 3 places instead of a manual loop. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121755 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-14 07:09:42 +00:00
Chris Lattner
73c50a68a7 make FoldTwoEntryPHINode use instsimplify a bit, make 
GetIfCondition faster by avoiding pred_iterator.  No
really interesting change.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121754 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-14 07:00:00 +00:00
Chris Lattner
2112bbc42d remove the dead (and terrible) llvm::RemoveSuccessor function. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121753 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-14 06:51:55 +00:00
Chris Lattner
302ba6fc1c improve DEBUG's a bit, switch to eraseFromParent() to simplify 
code a bit, switch from constant folding to instsimplify.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121751 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-14 06:17:25 +00:00
Chris Lattner
117f8cffc5 reapply my recent change that disables a piece of the switch formation 
work, but fixes 400.perlbmk.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121749 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-14 05:57:30 +00:00
Owen Anderson
2d9220e8f5 Fix recent buildbot breakage by pulling SimplifyCFG back to its state as of r121694, the most recent state 
where I'm confident there were no crashes or miscompilations.  XFAIL the test added since then for now.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121733 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-13 23:49:28 +00:00
Chris Lattner
f9a1b2a4cf temporarily disable part of my previous patch, which causes an iterator invalidation issue, causing a crash on some versions of perlbmk. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121728 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-13 23:02:19 +00:00
Chris Lattner
94c58a0906 add some DEBUG's. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121711 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-13 19:55:30 +00:00
Benjamin Kramer
cf8b3257c0 Fix sort predicate. qsort(3)'s predicate semantics differ from std::sort's. Fixes PR 8780. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121705 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-13 18:20:38 +00:00
Chris Lattner
a9f6bbea62 reinstate my patch: the miscompile was caused by an inverted branch in the 
'and' case.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121695 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-13 08:12:19 +00:00