This will we used for keeping register allocator data structures up to date
while LiveRangeEdit is trimming live intervals.

llvm-svn: 127300

reachable uses, but there still might be uses in dead blocks.  Use the
standard solution of replacing all the uses with undef.  This is
a rare case because it's very sensitive to phase ordering in SimplifyCFG.

llvm-svn: 127299

llvm-svn: 127298

* Add tests for VSRI and VSLI.

llvm-svn: 127297

llvm-svn: 127295

llvm-svn: 127294

* Update the NEON shift instruction test to expect what 'as' produces.

llvm-svn: 127293

LiveRangeEdit::eliminateDeadDefs() will eventually be used by coalescing,
splitting, and spilling for dead code elimination. It can delete chains of dead
instructions as long as there are no dependency loops.

llvm-svn: 127287

llvm-svn: 127282

llvm-svn: 127278

llvm-svn: 127272

llvm-svn: 127269

llvm-svn: 127266

llvm-svn: 127265

Patch by Olaf Krzikalla!

llvm-svn: 127264

with this before since none of the register tracking or nightly tests
had unschedulable nodes.

This should probably be refixed with a special default Node that just
returns some "don't touch me" values.

Fixes PR9427

llvm-svn: 127263

llvm-svn: 127262

MSVC 9."

The "fix" was meaningless.

This reverts commit r127245.

llvm-svn: 127260

llvm-svn: 127258

llvm-svn: 127256

llvm-svn: 127254

llvm-svn: 127252

Since last couple of days, argument number is encoded using 8 bits from line number field in argument's debug info.

llvm-svn: 127250

llvm-svn: 127249

Found by inspection.

llvm-svn: 127247

llvm-svn: 127246

llvm-svn: 127245

llvm-svn: 127244

llvm-svn: 127243

llvm-svn: 127241

llvm-svn: 127240

Reapply r127073(partially): Introduce $(ECHOPATH) to print DOSish path string on MSYS bash for alternative of $(ECHO).

On mingw and python/w32, lit would not be expected to understand MSYS-style path.

llvm-svn: 127239

llvm-svn: 127236

llvm-svn: 127224

llvm-svn: 127220

llvm-svn: 127214

llvm-svn: 127213

llvm-svn: 127209

testcases accordingly. Some are currently xfailed and will be filed
as bugs to be fixed or understood.

Performance results:

roughly neutral on SPEC
some micro benchmarks in the llvm suite are up between 100 and 150%, only
a pair of regressions that are due to be investigated

john-the-ripper saw:
10% improvement in traditional DES
8% improvement in BSDI DES
59% improvement in FreeBSD MD5
67% improvement in OpenBSD Blowfish
14% improvement in LM DES

Small compile time impact.

llvm-svn: 127208

This change uses the MaxReorderWindow for both height and depth, which
tends to limit the negative effects of high register pressure.

llvm-svn: 127203