llvm.invariant.start to be used without necessarily being paired with a call
to llvm.invariant.end.  If you run the entire optimization pipeline then such
calls are in fact deleted (adce does it), but that's actually a good thing since
we probably do want them to be zapped late in the game.  There should really be
an integration test that checks that the llvm.invariant.start call lasts long
enough that all passes that do interesting things with it get to do their stuff
before it is deleted.  But since no passes do anything interesting with it yet
this will have to wait for later.

llvm-svn: 86840

llvm-svn: 86810

start using them in a trivial way when -enable-jump-threading-lvi
is passed.  enable-jump-threading-lvi will be my playground for 
awhile.

llvm-svn: 86789

llvm-svn: 86766

llvm-svn: 86761

llvm-svn: 86748

llvm-svn: 86739

into libanalysis and transformutils.

llvm-svn: 86735

tracked down by Stephan Reiter!

llvm-svn: 86726

llvm-svn: 86723

debug intrinsics, and an unconditional branch when possible.  This
reuses the TryToSimplifyUncondBranchFromEmptyBlock function split
out of simplifycfg.

llvm-svn: 86722

llvm-svn: 86715

llvm-svn: 86705

llvm-svn: 86694

llvm-svn: 86689

llvm-svn: 86683

llvm-svn: 86681

Update computeArraySize() to use ComputeMultiple() to determine the array size associated with a malloc; also extend PerformHeapAllocSRoA() to check if the optimized malloc's arg had its highest bit set, so that it is safe for ComputeMultiple() to look through sext instructions while determining the optimized malloc's array size

llvm-svn: 86676

of a computation.  This fixes some infinite loops when dealing with TD that
has no native types.

llvm-svn: 86670

llvm-svn: 86668

memory just like a store" with bug fixed (partial-overwrite.ll is the
regression test).

llvm-svn: 86667

llvm-svn: 86666

llvm-svn: 86656

just one level deep.  On the testcase we go from getting this:

F1:                                               ; preds = %T2
  %F = and i1 true, %cond                         ; <i1> [#uses=1]
  br i1 %F, label %X, label %Y

to a fully threaded:

F1:                                               ; preds = %T2
  br label %Y


This changes gets us to the point where we're forming (too many) switch 
instructions on doug's strswitch testcase.

llvm-svn: 86646

llvm-svn: 86639

except that the result may not be a constant.  Switch jump threading to 
use it so that it gets things like (X & 0) -> 0, which occur when phi preds
are deleted and the remaining phi pred was a zero.

llvm-svn: 86637

This patch forbids implicit conversion of DenseMap::const_iterator to
DenseMap::iterator which was possible because DenseMapIterator inherited
(publicly) from DenseMapConstIterator. Conversion the other way around is now
allowed as one may expect.

The template DenseMapConstIterator is removed and the template parameter
IsConst which specifies whether the iterator is constant is added to
DenseMapIterator.

Actually IsConst parameter is not necessary since the constness can be
determined from KeyT but this is not relevant to the fix and can be addressed
later.

Patch by Victor Zverovich!

llvm-svn: 86636

llvm-svn: 86635

simplification, this handles the foldable fcmp x,x cases among many others.

llvm-svn: 86627

llvm-svn: 86625

Simplify[IF]Cmp pieces.  Add some predicates to CmpInst to 
determine whether a predicate is fp or int.

llvm-svn: 86624

individual operands instead of taking a temporary array

llvm-svn: 86619

llvm-svn: 86616

simplifies instruction users of PHIs when the phi is eliminated.  This
will be moved to transforms/utils after some other refactoring.

llvm-svn: 86603

llvm-svn: 86575

the loop. This is needed because with indirectbr it may not be possible
for LoopSimplify to guarantee that all loop exit predecessors are
inside the loop. This fixes PR5437.

LCCSA no longer actually requires LoopSimplify form, but for now it
must still have the dependency because the PassManager doesn't know
how to schedule LoopSimplify otherwise.

llvm-svn: 86569

it to a normal binop.  Patch by Alastair Lynn, testcase by me.

llvm-svn: 86524

putchar in case there is an error.

llvm-svn: 86515

used by a chain of other PHIs.

llvm-svn: 86503

llvm-svn: 86499