without this case we would end on an infinite recursion: the remainder is zero,
so Numerator - Remainder is equal to Numerator and so we would recursively ask
for the division of Numerator by Denominator.

llvm-svn: 209838

when ScalarEvolution::getElementSize returns nullptr it is safe to early return
in ScalarEvolution::findArrayDimensions such that we avoid later problems when
we try to divide the terms by ElementSize.

llvm-svn: 209837

llvm-svn: 209834

This makes it slightly harder to misuse Twines.  It is still possible to
refer to destroyed temporaries with the regular constructors, though.

Patch by Marco Alesiani!

llvm-svn: 209832

never used again and updating the abstract variable for each inlined
instance of it was questionable in the first place.

llvm-svn: 209829

llvm-svn: 209822

This seems to match what gcc does for ppc and what every other llvm
backend does.

This is a fixed version of r209638. The difference is to avoid any change
in behavior for functions. The logic for using constant pools for function
addresseses is spread over a few places and we have to keep them in sync.

llvm-svn: 209821

This would have found the miscompile in r209638.

llvm-svn: 209820

This reverts commit r209776.

It was miscompiling llvm::SelectionDAGISel::MorphNode.

llvm-svn: 209817

llvm-svn: 209803

llvm-svn: 209802

field represents ELF section header sh_info field and does not have any
sense for regular sections. Its interpretation depends on section type.

llvm-svn: 209801

llvm-svn: 209799

llvm-svn: 209798

During loop-unroll, loop exits from the current loop may end up in in different
outer loop. This requires to re-form LCSSA recursively for one level down from
the outer most loop where loop exits are landed during unroll. This fixes PR18861.

Differential Revision: http://reviews.llvm.org/D2976

llvm-svn: 209796

llvm-svn: 209792

This pass is disabled by default. Use -combine-loads to enable in -O[1-3]

Differential revision: http://reviews.llvm.org/D3580

llvm-svn: 209791

Clang knows about the sanitizer blacklist and it makes no sense to
add global to the list of llvm.asan.dynamically_initialized_globals if it
will be blacklisted in the instrumentation pass anyway. Instead, we should
do as much blacklisting as possible (if not all) in the frontend.

llvm-svn: 209790

An address only use of an extract element of a load can be simplified to a
load. Without this the result of the extract element is spilled to the
stack so that an address is available.

llvm-svn: 209788

These are confusing enough since the order swaps,
so give them more useful names.

llvm-svn: 209787

llvm-svn: 209784

Don't assume that dynamically initialized globals are all initialized from
_GLOBAL__<module_name>I_ function. Instead, scan the llvm.global_ctors and
insert poison/unpoison calls to each function there.

Patch by Nico Weber!

llvm-svn: 209780

Add a function to combine two 32-bit integers into a 64-bit integer.
There are no calls to this function yet, although a subsequent change
will add some in LLDB.

Reviewers: rnk

Differential Revision: http://reviews.llvm.org/D3941

llvm-svn: 209777

This reverts commit r209762, bringing back r209746. It was not responsible for the libc++ build failure

llvm-svn: 209776

This reverts commit r209755.

it was the real cause of the libc++ build failure.

llvm-svn: 209775

No test because no in-tree targets change the bitwidth of the
setcc type depending on the bitwidth of the compared type.

Patch by Ke Bai

llvm-svn: 209771

llvm-svn: 209770

llvm-svn: 209768

llvm-svn: 209763

This reverts commit r209746.

It looks it is causing a crash while building libcxx. I am trying to get a
reduced testcase.

llvm-svn: 209762

Previously, DataTypes.h would #define a variety of symbols any time
they weren't already defined.  However, some versions of Visual
Studio do provide the appropriate headers, so if those headers are
included after DataTypes.h, it can lead to macro redefinition
warnings.

The fix is to include the appropriate headers if they exist, and
only #define the symbols if the required header does not exist.

Patch by Zachary Turner!

---

The big change here is that we no longer have our own stdint.h
typedefs because now all supported toolchains have stdint.h.
Hooray!

llvm-svn: 209760

This matches gcc's behavior. It also seems natural given that aliases
contain other properties that govern how it is accessed (linkage,
visibility, dll storage).

Clang still has to be updated to expose this feature to C.

llvm-svn: 209759

Currently LLVM will generally merge GEPs. This allows backends to use more
complex addressing modes. In some cases this is not happening because there
is PHI inbetween the two GEPs:

  GEP1--\
        |-->PHI1-->GEP3
  GEP2--/

This patch checks to see if GEP1 and GEP2 are similiar enough that they can be
cloned (GEP12) in GEP3's BB, allowing GEP->GEP merging (GEP123):

  GEP1--\                     --\                           --\
        |-->PHI1-->GEP3  ==>    |-->PHI2->GEP12->GEP3 == >    |-->PHI2->GEP123
  GEP2--/                     --/                           --/

This also breaks certain use chains that are preventing GEP->GEP merges that the
the existing instcombine would merge otherwise.

Tests included.

llvm-svn: 209755

This reverts r208640 (I've just XFAILed the test) because it broke ppc64/Linux
self-hosting. Because nearly every regression test triggers a segfault, I hope
this will be easy to fix.

llvm-svn: 209747

This patch implements two things:

1. If we know one number is positive and another is negative, we return true as
   signed addition of two opposite signed numbers will never overflow.

2. Implemented TODO : If one of the operands only has one non-zero bit, and if
   the other operand has a known-zero bit in a more significant place than it
   (not including the sign bit) the ripple may go up to and fill the zero, but
   won't change the sign. e.x -  (x & ~4) + 1

We make sure that we are ignoring 0 at MSB.

Patch by Suyog Sarda.

llvm-svn: 209746

This reverts commit r209638 because it broke self-hosting on ppc64/Linux. (the
Clang-compiled TableGen would segfault because it jumped to an invalid address
from within _ZNK4llvm17ManagedStaticBase21RegisterManagedStaticEPFPvvEPFvS1_E
(which is within the command-line parameter registration process)).

llvm-svn: 209745

it is set.

llvm-svn: 209742

llvm-svn: 209721

Add regression tests for the following transformation:

  str X, [x20]
   ...
  add x20, x20, #32
   ->
  str X, [x20], #32

with X being either w0, x0, s0, d0 or q0.

llvm-svn: 209715

Add an __lldb_init_module function so that importing the
lldbDataFormatters script automatically adds the formatters.

llvm-svn: 209712