Summary:
Loop unroll spends a lot of time in SCEVs processing in case when a function
contains hundreds of simple 'for' loops with a quite complex arrays indexes like

  for (int i = 0; i < 8; ++i) {
    for (int j = 0; j < 32; ++j) {
      C[j*8+i] = B[j*32+i+128] + A[i*64+128];
    }
  }
  for (int i = 0; i < 8; ++i) {
    for (int j = 0; j < 8; ++j) {
      for (int k = 0; k < 32; ++k) {
        D[k*64+i*8+j] = D[k*64+i*8+j] + E[i+16] * C[k*8+j+256];
      }
    }
  }

The patch improves loop unroll speed since isLoopBackedgeGuardedByCond takes
much less time than isLoopEntryGuardedByCond in the edge case.

Reviewers: skatkov, sanjoy, mkazantsev

Reviewed By: sanjoy

Subscribers: fhahn, hiraditya, javed.absar, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D72929

Summary:
CXXRecordDecls that have a move constructor but no copy constructor need to
have their implicit copy constructor marked as deleted (see C++11 [class.copy]p7, p18)
Currently we don't do that when building an AST with ClangASTContext which causes
Sema to realise that the AST is malformed and asserting when trying to create an implicit
copy constructor for us in the expression:
```
Assertion failed: ((data().DefaultedCopyConstructorIsDeleted || needsOverloadResolutionForCopyConstructor())
    && "Copy constructor should not be deleted"), function setImplicitCopyConstructorIsDeleted, file include/clang/AST/DeclCXX.h, line 828.
```

In the test case there is a class `NoCopyCstr` that should have its copy constructor marked as
deleted (as it has a move constructor). When we end up trying to tab complete in the
`IndirectlyDeletedCopyCstr` constructor, Sema realises that the `IndirectlyDeletedCopyCstr`
has no implicit copy constructor and tries to create one for us. It then realises that
`NoCopyCstr` also has no copy constructor it could find via lookup. However because we
haven't marked the FieldDecl as having a deleted copy constructor the
`needsOverloadResolutionForCopyConstructor()` returns false and the assert fails.
`needsOverloadResolutionForCopyConstructor()` would return true if during the time we
added the `NoCopyCstr` FieldDecl to `IndirectlyDeletedCopyCstr` we would have actually marked
it as having a deleted copy constructor (which would then mark the copy constructor of
`IndirectlyDeletedCopyCstr ` as needing overload resolution and Sema is happy).

This patch sets the correct mark when we complete our CXXRecordDecls (which is the time when
we know whether a copy constructor has been declared). In theory we don't have to do this if
we had a Sema around when building our debug info AST but at the moment we don't have this
so this has to do the job for now.

Reviewers: shafik

Reviewed By: shafik

Subscribers: aprantl, JDevlieghere, lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D72694

It was unclear what "exiting a region" meant in the existing formulation.
Phrase it in terms of control flow transfer to the operation enclosing the
region.

Discussion: https://groups.google.com/a/tensorflow.org/d/msg/mlir/73d2O8gjTuA/xVj1KoCTBAAJ

Summary:
A recent commit accidentally defined names like `MVE_VMAXAs8` as
instances of the multiclass `MVE_VMINA`, and vice versa. This has no
effect on the test suite, because nothing directly refers to those
instruction names (the isel patterns are generated in Tablegen using
`!cast<Instruction>(NAME)` inside a lower-level multiclass). But it
means that `llvm-mc -show-inst` was listing VMAXA as VMINA, and it
would also affect any further draft code gen patches that use those
instruction ids.

Reviewers: MarkMurrayARM, dmgreen, miyuki, ostannard

Reviewed By: dmgreen

Subscribers: kristof.beyls, hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D73034

"-sample" option is now changed to "--sample".

Reviewers: ftynse, nicolasvasilache, herhut

Reviewed By: ftynse, herhut

Subscribers: liufengdb, aartbik, herhut, merge_guards_bot, mgorny, mehdi_amini, rriddle, jpienaar, burmako, shauheen, antiagainst, nicolasvasilache, arpith-jacob, mgester, lucyrfox, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D72129

The ACLE distinguishes between the following addressing modes for gather
loads:
  * "scalar base, vector offset", and
  * "vector base, scalar offset".
For the "vector base, scalar offset" case, the
`int_aarch64_sve_ld1_gather_imm` intrinsic was added in 79f2422d.
Currently, that intrinsic assumes that the scalar offset is passed as an
immediate.  As a result, it does not cater for cases where scalar offset
is stored in a register.

In this patch `int_aarch64_sve_ld1_gather_imm` is extended so that all
cases are covered:
* `int_aarch64_sve_ld1_gather_imm` is renamed as
  `int_aarch64_sve_ld1_gather_scalar_offset`
* new DAG combine rules are added for GLD1_IMM for scenarios where the
  offset is a non-immediate scalar or an out-of-range immediate
* sve-intrinsics-gather-loads-vector-base.ll is renamed as
  sve-intrinsics-gather-loads-vector-base-imm-offset.ll
* sve-intrinsics-gather-loads-vector-base-scalar-offset.ll is added to test
  file for non-immediate offsets

Similar changes are made for scatter store intrinsics.

Reviewed By: sdesmalen, efriedma

Differential Revision: https://reviews.llvm.org/D71773

Summary:
Normally, on linux we retrieve the process ID from the LinuxProcStatus
stream (which is just the contents of /proc/%d/status pseudo-file).

However, this stream is not strictly required (it's a breakpad
extension), and we are encountering a fair amount of minidumps which do
not have it present. It's not clear whether this is the case with all
these minidumps, but the two known situations where this stream can be
missing are:
- /proc filesystem not mounted (or something to that effect)
- process crashing after exhausting (almost) all file descriptors (so
  the minidump writer may not be able to open the /proc file)

Since this is a corner case which will become less and less relevant
(crashpad-generated minidumps should not suffer from this problem), I
work around this problem by hardcoding the PID to 1 in these cases.
The same thing is done by the gdb plugin when talking to a stub which
does not report a process id (e.g. a hardware probe).

Reviewers: jingham, clayborg

Subscribers: markmentovai, lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D70238

Summary:
This code is handling debug info paths starting with /proc/self/cwd,
which is one of the mechanisms people use to obtain "relocatable" debug
info (the idea being that one starts the debugger with an appropriate
cwd and things "just work").

Instead of resolving the symlinks inside DWARFUnit, we can do the same
thing more elegantly by hooking into the existing Module path remapping
code. Since llvm::DWARFUnit does not support any similar functionality,
doing things this way is also a step towards unifying llvm and lldb
dwarf parsers.

Reviewers: JDevlieghere, aprantl, clayborg, jdoerfert

Subscribers: lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D71770

Summary:
Motivation: When setting breakpoints in certain projects line sequences are frequently being inserted out of order.

Rather than inserting sequences one at a time into a sorted line table, store all the line sequences as we're building them up and sort and flatten afterwards.

Reviewers: jdoerfert, labath

Reviewed By: labath

Subscribers: teemperor, labath, mgrang, JDevlieghere, lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D72909

Summary:
This method was doing a lot more than it's only caller needed
(DWARFDIE::LookupDeepestBlock) needed, so I inline it into the caller,
and remove any code which is not actually used. This includes code for
searching for the deepest function, and the code for working around
incomplete DW_AT_low_pc/high_pc attributes on a compile unit DIE (modern
compiler get this right, and this method is called on function DIEs
anyway).

This also improves our llvm consistency, as llvm::DWARFDebugInfoEntry is
just a very simple struct with no nontrivial logic.

Reviewers: JDevlieghere, aprantl

Subscribers: lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D72920

Summary: Vectorized loop processes VFxUF number of elements in one iteration thus total number of iterations decreases proportionally. In addition epilog loop may not have more than VFxUF - 1 iterations. This patch updates profile information accordingly.

Reviewers: hsaito, Ayal, fhahn, reames, silvas, dcaballe, SjoerdMeijer, mkuper, DaniilSuchkov

Reviewed By: Ayal, DaniilSuchkov

Subscribers: fedor.sergeev, hiraditya, rkruppe, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D67905

Summary:
Printing policy was not propogated to functiondecls when creating a
completion string which resulted in canonical template parameters like
`foo<type-parameter-0-0>`. This patch propogates printing policy to those as
well.

Fixes https://github.com/clangd/clangd/issues/76

Reviewers: ilya-biryukov

Subscribers: jkorous, arphaman, usaxena95, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D72715

Attempt to use SimplifyMultipleUseDemandedBits to simplify PACKSS if we're only after the sign bit.

Summary:
The goal of this patch is two-fold. First, it fixes a use-after-free in
the construction of the llvm DWARFContext. This happened because the
construction code was throwing away the lldb DataExtractors it got while
reading the sections (unlike their llvm counterparts, these are also
responsible for memory ownership). In most cases this did not matter,
because the sections are just slices of the mmapped file data. But this
isn't the case for compressed elf sections, in which case the section is
decompressed into a heap buffer. A similar thing also happen with object
files which are loaded from process memory.

The second goal is to make it explicit which sections go into the llvm
DWARFContext -- any access to the sections through both DWARF parsers
carries a risk of parsing things twice, so it's better if this is a
conscious decision. Also, this avoids loading completely irrelevant
sections (e.g. .text). At present, the only section that needs to be
present in the llvm DWARFContext is the debug_line_str. Using it through
both APIs is not a problem, as there is no parsing involved.

The first goal is achieved by loading the sections through the existing
lldb DWARFContext APIs, which already do the caching. The second by
explicitly enumerating the sections we wish to load.

Reviewers: JDevlieghere, aprantl

Subscribers: lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D72917

This patch uses helper function rewriteLoopExitValues that is refactored in
D72602 to rematerialise the iteration count in exit blocks, so that we can
clean-up loop update expressions inside the hardware-loops later in
ARMLowOverheadLoops, which is necessary to get actual performance gains for
tail-predicated loops.

Differential Revision: https://reviews.llvm.org/D72714

If sysctl is not found at all, let the usual exception propogate
so that the user can fix their env. If it fails because of the
permissions required to read the property then print a warning
and continue.

Differential Revision: https://reviews.llvm.org/D72278

Summary: Current implementation of getLoopEstimatedTripCount returns 1 iteration less than it should. The reason is that in bottom tested loop first iteration is executed before first back branch is taken. For example for loop with !{!"branch_weights", i32 1 // taken, i32 1 // exit} metadata getLoopEstimatedTripCount gives 1 while actual number of iterations is 2.

Reviewers: Ayal, fhahn

Reviewed By: Ayal

Subscribers: mgorny, hiraditya, zzheng, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D71990

Recommit "[DWARF5][DebugInfo]: Added support for DebugInfo generation for auto return type for C++ member functions."

Summary:
This was reverted in 328e0f3d due to
chromium bot failure. This revision addresses that case.

Original commit message:
Summary:
    This patch will provide support for auto return type for the C++ member
    functions. Before this return type of the member function is deduced and
    stored in the DIE.
    This patch includes llvm side implementation of this feature.

    Patch by: Awanish Pandey <Awanish.Pandey@amd.com>

    Reviewers: dblaikie, aprantl, shafik, alok, SouraVX, jini.susan.george

    Reviewed by: dblaikie

    Differential Revision: https://reviews.llvm.org/D70524

We have a bug currently: printed tag names might overlap the
value column. It happens for MIPS now.

This patch adds a logic to calculate the size of indentation on fly
to fix such issues.

Differential revision: https://reviews.llvm.org/D72838

This moves `rewriteLoopExitValues()` from IndVarSimplify to LoopUtils thus
making it a generic loop utility function.  This allows to rewrite loop exit
values by just calling this function without running the whole IndVarSimplify
pass.

We use this in D72714 to rematerialise the iteration count in exit blocks, so
that we can clean-up loop update expressions inside the hardware-loops later.

Differential Revision: https://reviews.llvm.org/D72602

The idea is to produce R_X86_64_PLT32 instead of
R_X86_64_PC32 for branches.

It fixes https://bugs.llvm.org/show_bug.cgi?id=44397.

This patch teaches MC to do that for JCC (jump if condition is met)
instructions. The new behavior matches modern GNU as.
It is similar to D43383, which did the same for "call/jmp foo",
but missed JCC cases.

Differential revision: https://reviews.llvm.org/D72831

Differential Revision: https://reviews.llvm.org/D73014

This adds Post inc variants of the VLD2/4 and VST2/4 instructions in
MVE. It uses the same mechanism/nodes as Neon, transforming the
intrinsic+add pair into a ARMISD::VLD2_UPD, which gets selected to a
post-inc instruction. The code to do that is mostly taken from the
existing Neon code, but simplified as less variants are needed.

It also fills in some getTgtMemIntrinsic for the arm.mve.vld2/4
instrinsics, which allow the nodes to have MMO's, calculated as the full
length to the memory being loaded/stored.

Differential Revision: https://reviews.llvm.org/D71194

We were previously not necessarily favouring postinc for the MVE loads
and stores, leading to extra code prior to the loop to set up the
preinc. MVE in general can benefit from postinc (as we don't have
unrolled loops), and certain instructions like the VLD2's only post-inc
versions are available.

Differential Revision: https://reviews.llvm.org/D70790

StackColoring::remapInstructions() remaps MachineOperand frame index (e.g. %stack.1 -> %stack.0)
but does not remap FixedStackPseudoSourceValue frame index (e.g. store 4 into %stack.1.ap2.i.i)
referenced by MachineMemoryOperand.

This can cause an assertion failure when LiveDebugValues references a dead stack object.

It is difficult to craft a test case. -g, va_copy and stack-coloring are required.
I can only reproduce it on ppc32.

Differential Revision: https://reviews.llvm.org/D73012

builds.

Fix a libc++abi test that was incorrectly checking for threading
primitives even when threading was disabled.

Additionally, temporarily XFAIL some module tests that fail because
the <atomic> header is unsupported but still built as a part of the
std module.

To properly address this libc++ would either need to produce a different
module.modulemap for single-threaded configurations, or it would need
to make the <atomic> header not hard-error and instead be empty
for single-threaded configurations

Summary:
We previously listed first declared members, then implicit operator=,
then implicit operator==, then implicit destructors. Per discussion on
https://github.com/itanium-cxx-abi/cxx-abi/issues/88, put the implicit
equality comparison operators at the very end, after all special member
functions.

Reviewers: rjmccall

Subscribers: cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D72897

a temporary.

We previously failed to materialize a temporary when performing an
implicit conversion to a reference type, resulting in our thinking the
argument was a value rather than a reference in some cases.