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30 Commits

Author SHA1 Message Date
Andrew Trick
5e0ee1c7f2 LoopUnroll looks like it has some stale code. Remove it to prove my sanity and avoid further confusion. 
llvm-svn: 137106
 2011-08-09 03:11:29 +00:00
Andrew Trick
bf69d03382 SCEV: Use AssertingVH to catch dangling BasicBlock* when passes forget 
to notify SCEV of a change. Add forgetLoop in a couple of those places.

llvm-svn: 136797
 2011-08-03 18:32:11 +00:00
Andrew Trick
990f771a9a Add clarifying comments for the new arguments to UnrollLoop. 
llvm-svn: 135988
 2011-07-25 22:17:47 +00:00
Andrew Trick
1cabe54fab Move trip count discovery outside of the generic LoopUnroll helper. This 
removes its dependence on canonical induction variables.

llvm-svn: 135829
 2011-07-23 00:33:05 +00:00
Andrew Trick
279e7a6c83 whitespace 
llvm-svn: 135828
 2011-07-23 00:29:16 +00:00
Jay Foad
61ea0e4692 Reinstate r133513 (reverted in r133700) with an additional fix for a 
-Wshorten-64-to-32 warning in Instructions.h.

llvm-svn: 133708
 2011-06-23 09:09:15 +00:00
Eric Christopher
96513120b7 Revert r133513: 
"Reinstate r133435 and r133449 (reverted in r133499) now that the clang
self-hosted build failure has been fixed (r133512)."

Due to some additional warnings.

llvm-svn: 133700
 2011-06-23 06:24:52 +00:00
Benjamin Kramer
ccbb77f239 Remove unused variables. 
llvm-svn: 133514
 2011-06-21 14:58:30 +00:00
Jay Foad
a97a2c998e Reinstate r133435 and r133449 (reverted in r133499) now that the clang 
self-hosted build failure has been fixed (r133512).

llvm-svn: 133513
 2011-06-21 10:33:19 +00:00
Chad Rosier
184f3b37e2 Revert r133435 and r133449 to appease buildbots. 
llvm-svn: 133499
 2011-06-21 02:09:03 +00:00
Jay Foad
e03c05c35a Change how PHINodes store their operands. 
Change PHINodes to store simple pointers to their incoming basic blocks,
instead of full-blown Uses.

Note that this loses an optimization in SplitCriticalEdge(), because we
can no longer walk the use list of a BasicBlock to find phi nodes. See
the comment I removed starting "However, the foreach loop is slow for
blocks with lots of predecessors".

Extend replaceAllUsesWith() on a BasicBlock to also update any phi
nodes in the block's successors. This mimics what would have happened
when PHINodes were proper Users of their incoming blocks. (Note that
this only works if OldBB->replaceAllUsesWith(NewBB) is called when
OldBB still has a terminator instruction, so it still has some
successors.)

llvm-svn: 133435
 2011-06-20 14:38:01 +00:00
Chris Lattner
4a14fbc50c Don't unroll loops whose header block's address is taken. 
This is part of a futile attempt to not "break" bizzaro
code like this:

 l1:
  printf("l1: %p\n", &&l1);
  ++x;

  if( x < 3 ) goto l1;


Previously we'd fold &&l1 to 1, which is fine per our semantics
but not helpful to the user.

llvm-svn: 125827
 2011-02-18 04:25:21 +00:00
Chris Lattner
dfcfcb49fa random cleanups 
llvm-svn: 123221
 2011-01-11 08:00:40 +00:00
Jay Foad
89afb43b1e Remove all uses of the "ugly" method BranchInst::setUnconditionalDest(). 
llvm-svn: 123025
 2011-01-07 20:25:56 +00:00
Duncan Sands
433c1679cf Replace calls to ConstantFoldInstruction with calls to SimplifyInstruction 
in two places that are really interested in simplified instructions, not
constants.

llvm-svn: 120044
 2010-11-23 20:26:33 +00:00
Rafael Espindola
229e38f0fe Be more consistent in using ValueToValueMapTy. 
llvm-svn: 116387
 2010-10-13 01:36:30 +00:00
Dan Gohman
a7908ae369 Preserve ScalarEvolution in the loop unroller. 
llvm-svn: 109412
 2010-07-26 18:02:06 +00:00
Devang Patel
0dc3c2d37e Use ValueMap instead of DenseMap. 
The ValueMapper used by various cloning utility maps MDNodes also.

llvm-svn: 106706
 2010-06-24 00:33:28 +00:00
Devang Patel
b8f11de105 Cosmetic change. 
Do not use "ValueMap" as a name for a local variable or an argument.

llvm-svn: 106698
 2010-06-23 23:55:51 +00:00
Devang Patel
2176643241 Rename ValueMapTy as ValueToValueMapTy to clearly indicate that this has no replationship with ADT/ValueMap. 
llvm-svn: 101950
 2010-04-20 22:24:18 +00:00
Dan Gohman
2734ebd37f Add a DominatorTree argument to isLCSSA so that it doesn't have to 
compute a set of reachable blocks for itself each time it is called, which
is fairly frequently.

llvm-svn: 98179
 2010-03-10 19:38:49 +00:00
Benjamin Kramer
1266d46d32 Don't bother with sprintf, just pass the Twine through. 
llvm-svn: 94684
 2010-01-27 19:58:47 +00:00
David Greene
627f40a9f2 Change errs() to dbgs(). 
llvm-svn: 92600
 2010-01-05 01:26:41 +00:00
Dan Gohman
18fa5686f6 Add Loop contains utility methods for testing whether a loop 
contains another loop, or an instruction. The loop form is
substantially more efficient on large loops than the typical
code it replaces.

llvm-svn: 91654
 2009-12-18 01:24:09 +00:00
Chris Lattner
46b5c642b9 remove a bunch of extraneous LLVMContext arguments 
from various APIs, addressing PR5325.

llvm-svn: 86231
 2009-11-06 04:27:31 +00:00
Dan Gohman
415c64ea3f Teach LoopUnroll how to bail if LoopSimplify can't give it what it needs. 
llvm-svn: 86164
 2009-11-05 19:44:06 +00:00
Dan Gohman
2d02ff8cbb Revert r85667. LoopUnroll currently can't call utility functions which 
auto-update the DominatorTree because it doesn't keep the DominatorTree
current while it works.

llvm-svn: 85670
 2009-10-31 17:33:01 +00:00
Dan Gohman
041e2dbad1 Merge the enhancements from LoopUnroll's FoldBlockIntoPredecessor into 
MergeBlockIntoPredecessor. This makes SimplifyCFG slightly more aggressive,
and makes it unnecessary for LoopUnroll to have its own copy of this code.

llvm-svn: 85667
 2009-10-31 16:08:00 +00:00
Dan Gohman
fa8969f70e Simplify this code. 
llvm-svn: 85662
 2009-10-31 14:46:50 +00:00
Dan Gohman
f70e76c435 Rename UnrollLoop.cpp to LoopUnroll.cpp, and LoopUnroll.cpp to 
LoopUnrollPass.cpp, for consistency with other passes which are
similarly split.

llvm-svn: 85659
 2009-10-31 14:37:31 +00:00