The Cost field is removed. It was only being used in a very limited way,
to indicate when the scheduler should attempt to protect a live register,
and it isn't really needed to do that. If we ever want the scheduler to
start inserting copies in non-prohibitive situations, we'll have to
rethink some things anyway.

A Latency field is added. Instead of giving each node a single
fixed latency, each edge can have its own latency. This will eventually
be used to model various micro-architecture properties more accurately.

The PointerIntPair class and an internal union are now used, which
reduce the overall size.

llvm-svn: 60806

invalidateCachedPointerInfo.  Thanks to Bill for sending me
a testcase.

llvm-svn: 60805

llvm-svn: 60804

has added declaration of these methods in its @interface.

llvm-svn: 60803

target-independent way of determining overflow on multiplication. It's very
tricky. Patch by Zoltan Varga!

llvm-svn: 60800

of a pointer.  This allows is to catch more equivalencies.  For example,
the type_lists_compatible_p function used to require two iterations of
the gvn pass (!) to delete its 18 redundant loads because the first pass
would CSE all the addressing computation cruft, which would unblock the
second memdep/gvn passes from recognizing them.  This change allows
memdep/gvn to catch all 18 when run just once on the function (as is 
typical :) instead of just 3.

On all of 403.gcc, this bumps up the # reundandancies found from:

     63 gvn    - Number of instructions PRE'd
 153991 gvn    - Number of instructions deleted
  50069 gvn    - Number of loads deleted
to:
     63 gvn    - Number of instructions PRE'd
 154137 gvn    - Number of instructions deleted
  50185 gvn    - Number of loads deleted

+120 loads deleted isn't bad.

llvm-svn: 60799

essential problem was that the DAG can contain
random unused nodes which were never analyzed.
When remapping a value of a node being processed,
such a node may become used and need to be analyzed;
however due to operands being transformed during
analysis the node may morph into a different one.
Users of the morphing node need to be updated, and
this wasn't happening.  While there I added a bunch
of documentation and sanity checks, so I (or some
other poor soul) won't have to scratch their head
over this stuff so long trying to remember how it
was all supposed to work next time some obscure
problem pops up!  The extra sanity checking exposed
a few places where invariants weren't being preserved,
so those are fixed too.  Since some of the sanity
checking is expensive, I added a flag to turn it
on.  It is also turned on when building with
ENABLE_EXPENSIVE_CHECKS=1.

llvm-svn: 60797

Have BasicStoreManager::getLValueElement() have logic similar to BasicStoreManager::getLValueField() (i.e., don't just return the 'base' as the SVal)

llvm-svn: 60795

tricks based on readnone/readonly functions.

Teach memdep to look past readonly calls when analyzing
deps for a readonly call.  This allows elimination of a
few more calls from 403.gcc:

before:
     63 gvn    - Number of instructions PRE'd
 153986 gvn    - Number of instructions deleted
  50069 gvn    - Number of loads deleted

after:
     63 gvn    - Number of instructions PRE'd
 153991 gvn    - Number of instructions deleted
  50069 gvn    - Number of loads deleted

5 calls isn't much, but this adds plumbing for the next change.

llvm-svn: 60794

llvm-svn: 60793

the synthesis is in an implementation of s subclass of
a super class where the property has been declared.

llvm-svn: 60792

llvm-svn: 60791

llvm-svn: 60790

In GRExprEngine treat @throw as an 'abort' that ends the current path.  This is a temporary solution.

llvm-svn: 60789

load dependence queries.  This allows GVN to eliminate a few more
instructions on 403.gcc:

 152598 gvn    - Number of instructions deleted
  49240 gvn    - Number of loads deleted
after:
 153986 gvn    - Number of instructions deleted
  50069 gvn    - Number of loads deleted

llvm-svn: 60786

pointer stuff from it, simplifying the code a bit.

llvm-svn: 60783

llvm-svn: 60782

Sema::ActOnMethodDeclaration(): Make sure we perform the default function/array conversion for parameter types.

This fixes <rdar://problem/6424064> checker on xcode: (possible bad AST) can the type of a method parameter really have "isFunctionType() == true"?
and http://llvm.org/bugs/show_bug.cgi?id=2997.

llvm-svn: 60781

MemDep::getNonLocalPointerDependency method.  There are
some open issues with this (missed optimizations) and
plenty of future work, but this does allow GVN to eliminate
*slightly* more loads (49246 vs 49033).

Switching over now allows simplification of the other code
path in memdep.

llvm-svn: 60780

llvm-svn: 60779

llvm-svn: 60778

llvm-svn: 60777

llvm-svn: 60776

llvm-svn: 60771

llvm-svn: 60770

llvm-svn: 60769

llvm-svn: 60767

llvm-svn: 60766

llvm-svn: 60765

llvm-svn: 60764

llvm-svn: 60763

llvm-svn: 60761

More fancy footwork to cope with rewriting property 'setters'.

llvm-svn: 60760

llvm-svn: 60759

llvm-svn: 60758

llvm-svn: 60755

llvm-svn: 60754

llvm-svn: 60753

the first block of a query specially.  This makes the "complete query
caching" subsystem more effective, avoiding predecessor queries.  This
speeds up GVN another 4%.

llvm-svn: 60752

and split its inner loop out into a new GetNonLocalInfoForBlock
function.  No functionality change.

llvm-svn: 60751