lines. No functionality change.

llvm-svn: 136458

working on x86 (at least for trivial testcases); other architectures will
need more work so that they actually emit the appropriate instructions for
orderings stricter than 'monotonic'. (As far as I can tell, the ARM, PPC,
Mips, and Alpha backends need such changes.)

llvm-svn: 136457

rounding errors.

llvm-svn: 136456

First off, only depend on the actual MC-ized disassemblers in the
targets, not all of the libraries those in turn depend on.

Second off, only depend on those MC-ized disassemblers for targets we're
building.

This should fix builds of fewer than all targets.

llvm-svn: 136455

on the second half must be reindexed.

llvm-svn: 136454

generation to always catch the weird cases.

llvm-svn: 136453

llvm-svn: 136452

llvm-svn: 136451

undef mask elements. This fixes PR10529.

llvm-svn: 136450

Also tidy up code a bit.

llvm-svn: 136449

Also make PALIGNR masks to don't match 256-bits, which isn't supported
It's also a step to solve PR10489

llvm-svn: 136448

With this, we can now compile a simple EH program.

llvm-svn: 136446

llvm-svn: 136445

llvm-svn: 136444

Later passes /are/ using this information when running the register
scavenger.

This fixes the second problem in PR10520.

llvm-svn: 136440

This hidden llc option runs the machine code verifier after expanding
ARM pseudo-instructions, but before if-conversion.

The machine code verifier is much better at pointing out liveness errors
that can trip up the register scavenger.

llvm-svn: 136439

Make sure to correctly clear the exact/nuw/nsw flags off of shifts when they are combined together. <rdar://problem/9859829>

llvm-svn: 136435

specified in the same file that the library itself is created. This is
more idiomatic for CMake builds, and also allows us to correctly specify
dependencies that are missed due to bugs in the GenLibDeps perl script,
or change from compiler to compiler. On Linux, this returns CMake to
a place where it can relably rebuild several targets of LLVM.

I have tried not to change the dependencies from the ones in the current
auto-generated file. The only places I've really diverged are in places
where I was seeing link failures, and added a dependency. The goal of
this patch is not to start changing the dependencies, merely to move
them into the correct location, and an explicit form that we can control
and change when necessary.

This also removes a serialization point in the build because we don't
have to scan all the libraries before we begin building various tools.
We no longer have a step of the build that regenerates a file inside the
source tree. A few other associated cleanups fall out of this.

This isn't really finished yet though. After talking to dgregor he urged
switching to a single CMake macro to construct libraries with both
sources and dependencies in the arguments. Migrating from the two macros
to that style will be a follow-up patch.

Also, llvm-config is still generated with GenLibDeps.pl, which means it
still has slightly buggy dependencies. The internal CMake
'llvm-config-like' macro uses the correct explicitly specified
dependencies however. A future patch will switch llvm-config generation
(when using CMake) to be based on these deps as well.

This may well break Windows. I'm getting a machine set up now to dig
into any failures there. If anyone can chime in with problems they see
or ideas of how to solve them for Windows, much appreciated.

llvm-svn: 136433

llvm-svn: 136432

llvm-svn: 136431

This generates the correct SDNodes for the landingpad instruction. It makes an
assumption that the result of the landingpad instruction has at least two
values. And that the first value is a pointer to the exception object and the
second value is the "selector."

llvm-svn: 136430

AddLandingPadInfo takes a landingpad instruction and grabs all of the
information from it that it needs for EH table generation.

llvm-svn: 136429

LBH_TAKEN_WEIGHT + LBH_NONTAKEN_WEIGHT = 128 which in _most_ cases reduce
number of rounding errors.

llvm-svn: 136428

llvm-svn: 136427

llvm-svn: 136408

Add parsing support for BLX (immediate). Since the register operand version is
predicated and the label operand version is not, we have to use some special
handling to get the operand list right for matching.

llvm-svn: 136406

llvm-svn: 136405

'atomicrmw' instructions, which allow representing all the current atomic
rmw intrinsics.

The allowed operands for these instructions are heavily restricted at the
moment; we can probably loosen it a bit, but supporting general
first-class types (where it makes sense) might get a bit complicated,
given how SelectionDAG works.

As an initial cut, these operations do not support specifying an alignment,
but it would be possible to add if we think it's useful. Specifying an
alignment lower than the natural alignment would be essentially
impossible to support on anything other than x86, but specifying a greater
alignment would be possible.  I can't think of any useful optimizations which
would use that information, but maybe someone else has ideas.

Optimizer/codegen support coming soon.

llvm-svn: 136404

llvm-svn: 136403

llvm-svn: 136402

Code like that would only be produced by bugpoint, but we should still
handle it correctly.

When a register is defined by a REG_SEQUENCE of undefs, the register
itself is undef. Previously, we would create a register with uses but no
defs.

Fixes part of PR10520.

llvm-svn: 136401

llvm-svn: 136400

Add parsing support that handles converting the lsb+width source into the
odd way we represent the instruction (an inverted bitfield mask).

llvm-svn: 136399

there is no frequency difference whether condition is in the header or in
the latch.

llvm-svn: 136398

llvm-svn: 136396

llvm-svn: 136392

llvm-svn: 136390

There are two conflicting strategies in play:

- Under high register pressure, we want to assign large live ranges
  first. Smaller live ranges are easier to place afterwards.

- Live range splitting is guided by interference, so splitting should be
  deferred until interference is as realistic as possible.

With the recent changes to the live range stages, and with compact
regions enabled, it is less traumatic to split a live range too early.
If some of the split products were too big, they can often be split
again.

By reversing the RS_Split order, we get this queue order:

1. Normal live ranges, large to small.
2. RS_Split live ranges, large to small.

The large-to-small order improves RAGreedy's puzzle solving skills under
high register pressure. It may cause a bit more iterated splitting, but
we handle that better now.

With this change, -compact-regions is mostly an improvement on SPEC.

llvm-svn: 136388

This should be the only code necessary for DWARF EH prepare.

llvm-svn: 136387

llvm-svn: 136384