optional library support to the llvm-build tool:
 - Add new command line parameter to llvm-build: “--enable-optional-libraries”
 - Add handing of new llvm-build library type “OptionalLibrary”
 - Update Cmake and automake build systems to pass correct flags to llvm-build
   based on configuration

Patch by Dan Malea!

llvm-svn: 156319

This was probably intended all along.

llvm-svn: 156318

This function is a generalization of getMatchingSuperRegClass() to the
symmetric case where both sides are using a sub-register index. It will
find a super-register class and sub-register indexes that make this
diagram commute:

                                   PreA
                       SuperRC  ---------->  RCA

                          |                   |
                          |                   |
                     PreB |                   | SubA
                          |                   |
                          |                   |
                          V                   V

                         RCB    ----------> SubRC
                                   SubB

This can be used to coalesce copies like:

  %vreg1:sub16 = COPY %vreg2:sub16; GR64:%vreg1, GR32: %vreg2

llvm-svn: 156317

single use.
rdar://11360370

llvm-svn: 156316

Fixes a -Woverflow warning from gcc when building for 32-bit platforms.

llvm-svn: 156313

This patch will optimize -(x != 0) on X86
FROM 
cmpl	$0x01,%edi
sbbl	%eax,%eax
notl	%eax
TO
negl %edi
sbbl %eax %eax

In order to generate negl, I added patterns in Target/X86/X86InstrCompiler.td:
def : Pat<(X86sub_flag 0, GR32:$src), (NEG32r GR32:$src)>;

rdar: 10961709
llvm-svn: 156312

Patch by Jack Carter.

llvm-svn: 156295

Patch by Jack Carter.

llvm-svn: 156294

Patch by Jack Carter.

llvm-svn: 156293

Patch by Jack Carter.

llvm-svn: 156292

llvm-svn: 156288

llvm-svn: 156287

Patch by Jack Carter.

llvm-svn: 156285

Patch by Jack Carter.

llvm-svn: 156284

Patch by Jack Carter.

llvm-svn: 156283

llvm-svn: 156282

llvm-svn: 156281

Patch by Jack Carter.

llvm-svn: 156280

from the previous 2 patches.

Patch by Jack Carter.

llvm-svn: 156279

Patch by Jack Carter.

llvm-svn: 156278

non-floating point general registers allow 8 and 16-bit
elements.

Patch by Jack Carter.

llvm-svn: 156277

llvm-svn: 156276

Use MVT instead of EVT as the argument to all the shuffle decode functions. Simplify some of the decode functions.

llvm-svn: 156268

Add VPERMQ/VPERMPD to the list of target specific shuffles that can be looked through for DAG combine purposes.

llvm-svn: 156266

llvm-svn: 156265

Previously, if an instruction definition was missing the mnemonic,
the next line would just assert(). Issue a real diagnostic instead.

llvm-svn: 156263

llvm-svn: 156260

The primitive conservative heuristic seems to give a slight overall
improvement while not regressing stuff. Make it available to wider
testing. If you notice any speed regressions (or significant code
size regressions) let me know!

llvm-svn: 156258

llvm-svn: 156257

llvm-svn: 156252

FIXME: GetRandomNumber() is not implemented in Win32.
llvm-svn: 156251

of work for a drive-by fix :)

llvm-svn: 156246

llvm-svn: 156245

llvm-svn: 156244

refactor some code to expose column numbers more and make diagnostic printing slightly more efficient.

llvm-svn: 156243

llvm-svn: 156241

llvm-svn: 156240

llvm-svn: 156239

 - Just use sys::Process::GetRandomNumber instead of having two poor
   implementations.
 - This is ~70 times (!) faster on my OS X machine.

llvm-svn: 156238

 - Primitive API, but we rarely have need for random numbers.

llvm-svn: 156237