Add support to the linker to lazily link in functions. This change only links functions marked with specific linkage (internal, private, linker_private, linker_private_weak, linker_private_weak_def_auto, linkonce, linkonce_odr, and available_externally) if they have uses in the destination module. Instead of automatically linking, these functions are placed onto a worklist to be processed in the final stage of linking. We iterate over the list and if any functions on the list have uses in the destination module, we link them in and repeat the process until no changes in the state (uses) has changed. This means that any functions in the LazilyLink worklist that have a use in the destination module will be linked in and none that don't. 

llvm-svn: 143524

llvm-svn: 143523

Narrowest possible fix for PR11279.

llvm-svn: 143522

it is separating the directory part from the basename of the FileName.  Noticed 
that this:

  .file 1 "dir/foo"

when assembled got the two parts switched.  Using the Mac OS X dwarfdump tool
it can be seen easily:

% dwarfdump -a a.out
include_directories[  1] = 'foo'
                Dir  Mod Time   File Len   File Name
                ---- ---------- ---------- ---------------------------
file_names[  1]    1 0x00000000 0x00000000 dir
...

Which should be:
...
include_directories[  1] = 'dir'
                Dir  Mod Time   File Len   File Name
                ---- ---------- ---------- ---------------------------
file_names[  1]    1 0x00000000 0x00000000 foo

llvm-svn: 143521

For example, labels from Objective-C sources.

llvm-svn: 143511

llvm-svn: 143510

-g flag.  In this part we generate the .file for the source being assembled and
the .loc's for the assembled instructions.

The next part will be to generate the dwarf Compile Unit DIE and a dwarf
subprogram DIE for each non-temporary label.

Once the next part is done test cases will be added.  rdar://9275556

llvm-svn: 143509

llvm-svn: 143507

llvm-svn: 143502

llvm-svn: 143501

Teach the x86 backend a couple tricks for dealing with v16i8 sra by a constant splat value.  Fixes PR11289.

llvm-svn: 143498

They don't impact the MCJIT rtdyld, so just mask them off for now.

llvm-svn: 143472

This can happen if the address + addend is less than the start of the cp / dp.

llvm-svn: 143459

llvm-svn: 143452

Make sure we use the right insertion point when instcombine replaces a PHI with another instruction.  (Specifically, don't insert an arbitrary instruction before a PHI.)  Fixes PR11275.

llvm-svn: 143437

llvm-svn: 143413

No test case, spotted by inspection.

llvm-svn: 143407

llvm-svn: 143406

Patch by Kostya Serebryany.

llvm-svn: 143405

llvm-svn: 143369

Cleanup. Document. Make sure that this build_vector optimization only runs before the op legalizer and that the used type is legal.

llvm-svn: 143358

The _fixed variants have a writeback operand, but not a stride operand.
Split the conditional flag to distinguish the cases.

llvm-svn: 143356

llvm-svn: 143351

llvm-svn: 143331

-enable-dwarf-directory.

llvm-svn: 143326

llvm-svn: 143319

with the given predicate, it matches any condition and returns the
predicate - d'oh!  Original commit message:
The expression icmp eq (select (icmp eq x, 0), 1, x), 0 folds to false.
Spotted by my super-optimizer in 186.crafty and 450.soplex.  We really
need a proper infrastructure for handling generalizations of this kind
of thing (which occur a lot), however this case is so simple that I decided
to go ahead and implement it directly.

llvm-svn: 143318

llvm-svn: 143316

X86: Emit logical shift by constant splat of <16 x i8> as a <8 x i16> shift and zero out the bits where zeros should've been shifted in.

llvm-svn: 143315

Fix pr11266.

On x86: (shl V, 1) -> add V,V

Hardware support for vector-shift is sparse and in many cases we scalarize the
result. Additionally, on sandybridge padd is faster than shl.

llvm-svn: 143311

llvm-svn: 143308

If all of the inputs are zero/any_extended, create a new simple BV
which can be further optimized by other BV optimizations.

llvm-svn: 143297

Should fix assertion failures on ppc buildbots.

llvm-svn: 143290

SimplifyLibCalls: Use IRBuilder.CreateGlobalString when creating a string for printf->puts, which correctly sets the unnamed_addr bit on the resulting GlobalVariable.

Fixes PR11264.

llvm-svn: 143289

llvm-svn: 143265

llvm-svn: 143262

llvm-svn: 143237

When '~imm' is encodable as a t2_so_imm but plain 'imm' is not. For example,
  mov r2, #-3
becomes
  mvn r2, #2

rdar://10349224

llvm-svn: 143235

llvm-svn: 143220

llvm-svn: 143218