suggested as a better solution by Matt

llvm-svn: 287942

llvm-svn: 287941

llvm-svn: 287940

[AVX-512] Add support for changing VSHUFF64x2 to VSHUFF32x4 when its feeding a vselect with 32-bit element size.

Summary:
Shuffle lowering may have widened the element size of a i32 shuffle to i64 before selecting X86ISD::SHUF128. If this shuffle was used by a vselect this can prevent us from selecting masked operations.

This patch detects this and changes the element size to match the vselect.

I don't handle changing integer to floating point or vice versa as its not clear if its better to push such a bitcast to the inputs of the shuffle or to the user of the vselect. So I'm ignoring that case for now.

Reviewers: delena, zvi, RKSimon

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D27087

llvm-svn: 287939

llvm-svn: 287938

llvm-svn: 287937

This reverts commit 4404d0d6e354e80dd7f8f0a0e12d8ad809cf007e.

llvm-svn: 287936

This reverts commit 79d4f8b8b1ce430c3d5dac4fc72a9eebaed24fe1.

llvm-svn: 287935

This reverts commit e834ce5976567575621901fb967b8018b9916d71.

llvm-svn: 287934

This reverts commit 057bbbe4ae170247ba37f08f2e70ef185267d1bb.

llvm-svn: 287933

This reverts commit 124ad83dae04514f943902446520c859adee0e96.

llvm-svn: 287932

This reverts commit f18de36554eb22416f8ba58e094e0272523a4301.

llvm-svn: 287931

This reverts commit a5a179ffd94fd4136df461ec76fb30f04afa87ce.

llvm-svn: 287930

Summary:
If the `FromDecl` is a class forward declaration, the reference is
still considered as referring to the original definition given the nature
of forward-declarations, so we can't do a raw name replacement in this case.

Reviewers: bkramer

Subscribers: cfe-commits, klimek

Differential Revision: https://reviews.llvm.org/D27132

llvm-svn: 287929

llvm-svn: 287928

Switch various bits of platform-specific code to chrono that I did not notice
when doing a linux build. This exposed a bug that ConnectionGenericFileWindows
did not handle the magic UINT32_MAX timeout value (instead it waited for about an
hour, which is close enough I guess). Fix that as well.

llvm-svn: 287927

llvm-svn: 287926

Summary:
The iterative algorithm for Loop Unswitching may render some of the branches unreachable in the unswitched loops.
Given the exponential nature of the algorithm, this is quite an overhead.
This patch fixes this problem by selectively unswitching only those branches within a loop that are reachable from the loop header.

Reviewers: Michael Zolothukin, Anna Thomas, Weiming Zhao.
Subscribers: llvm-commits.

Differential Revision: http://reviews.llvm.org/D26299

llvm-svn: 287925

Summary:
For example, this case was missed when looking for different but canonical
namespaces. UseContext in this case should be considered as in the canonical
namespace.
```
namespace a { namespace b { <FromContext> } }
namespace a { namespace b { namespace c { <UseContext> } } }
```
Added some commenting.

Reviewers: bkramer

Subscribers: klimek, cfe-commits

Differential Revision: https://reviews.llvm.org/D27125

llvm-svn: 287924

I accidentally used the wrong brackets when including llvm headers.

llvm-svn: 287923

llvm-svn: 287922

The conditional expression is ambiguous there, so help it by explicitly casting.
This will go away once we use chrono all the way down.

llvm-svn: 287921

This replaces the raw integer timeout parameters in the class with their
chrono-based equivalents.  To achieve this, I have moved the Timeout class to a
more generic place and added a quick unit test for it.

llvm-svn: 287920

llvm-svn: 287919

This patch corrects the behaviour of code such as:

   .local foo
   jal foo
foo:
to use the correct jal expansion when writing ELF files.

Patch by: Daniel Sanders

Reviewers: zoran.jovanovic, seanbruno, vkalintiris

Differential Revision: https://reviews.llvm.org/D24722

llvm-svn: 287918

Differential revision: https://reviews.llvm.org/D24794

llvm-svn: 287917

Summary:
This is a test-the-water change about possibilities of reducing duplication in
the register context definitions.

I've named the new class RegisterInfoPOSIX, as RegisterContextPOSIX was already
taken :(.  The two files were identical except for a fix by Tamas in D12636,
which was applied to the Linux version only, which fixed a discrepancy between
the definitions of fpsr and fpcr on one hand, and all other floating point
register definitions on the other.

Linux test suite still passes after this change. For freebsd, make the floating
point register behavior consistent, but I don't know whether it will be
consistently fixed, or consistently broken. By eyeballing the code, I have a
feeling that a similar fix to D12636 will be required in
RegisterContextPOSIXProcessMonitor_arm64::ReadRegister, but I can't be sure as I
have no way to test it (the assert in that function should fire upon accessing
the registers if it is wrong though).

Reviewers: emaste, clayborg

Subscribers: aemerson, rengolin, beanz, mgorny, modocache, dmikulin, lldb-commits

Differential Revision: https://reviews.llvm.org/D25947

llvm-svn: 287916

Differential revision: https://reviews.llvm.org/D27055

llvm-svn: 287915

Differential revision: https://reviews.llvm.org/D27098

llvm-svn: 287914

This is important for cases like:

  .sdata        : {
    *(.got.plt .got)
...
  }

That was not supported before as there was no way to get access to 
synthetic sections from script.

More details on review page.

Differential revision: https://reviews.llvm.org/D27040

llvm-svn: 287913

Broke the build on arm7 and aarch64.

llvm-svn: 287911

Summary:
This implements a simple buffer queue to manage a pre-allocated queue of
fixed-sized buffers to hold XRay records. We need this to support
Flight Data Recorder (FDR) mode. We also implement this as a sub-library
first to allow for development before actually using it in an
implementation.

Some important properties of the buffer queue:

- Thread-safe enqueueing/dequeueing of fixed-size buffers.
- Pre-allocation of buffers at construction.

Reviewers: majnemer, rSerge, echristo

Subscribers: mehdi_amini, mgorny, llvm-commits

Differential Revision: https://reviews.llvm.org/D26232

llvm-svn: 287910

llvm-svn: 287909

llvm-svn: 287908

Differential Revision: https://reviews.llvm.org/D27069

llvm-svn: 287905

[DAGCombine] Teach DAG combine that if both inputs of a vselect are the same, then the condition doesn't matter and the vselect can be removed.

Selects with scalar condition already handle this correctly.

llvm-svn: 287904

I'd like to teach DAG combine to remove vselects where both sides are identical and these tests were in the way of that.

llvm-svn: 287903

GCD queues can be suspended and resumed with dispatch_suspend and dispatch_resume. We need to add synchronization between the call to dispatch_resume and any subsequent executions of blocks in the queue that was resumed. We already have an Acquire(q) before the block executes, so this patch just adds the Release(q) in an interceptor of dispatch_resume.

Differential Revision: https://reviews.llvm.org/D27112

llvm-svn: 287902

llvm-svn: 287901

This patch changes the error message from

  too many errors emitted, stopping now

to

  too many errors emitted, stopping now (use -error-limit=0 to see all errors)

Thanks for Sean for the suggestion!

llvm-svn: 287900