Replaced the linearized address with the proper LLVM way of
defining vector of base + indices in SIMD style. This yields
much better code. Some prototype results with microbencmarking
sparse matrix x vector with 50% sparsity (about 2-3x faster):

         LINEARIZED     IMPROVED
GFLOPS  sdot  saxpy     sdot saxpy
16x16    1.6   1.4       4.4  2.1
32x32    1.7   1.6       5.8  5.9
64x64    1.7   1.7       6.4  6.4
128x128  1.7   1.7       5.9  5.9
256x256  1.6   1.6       6.1  6.0
512x512  1.4   1.4       4.9  4.7

Reviewed By: nicolasvasilache

Differential Revision: https://reviews.llvm.org/D84368

This reapplies commit d4020ef7, reverted in ac0edc55 because it
broke build of LLDB. This commit contains appropriate changes for LLDB.
The original commit message is below.

Documentation on CreateProcessW states that maximal size of command line
is 32767 characters including ternimation null character. In the
function llvm::sys::commandLineFitsWithinSystemLimits this limit was set
to 32768. As a result if command line was exactly 32768 characters long,
a response file was not created and CreateProcessW was called with
too long command line.

Differential Revision: https://reviews.llvm.org/D83772

The revert was a misfire.

Remove the temporary flag PGSOIRPassOrTestOnly and the guard code which was used
for the staged rollout. This is a cleanup (NFC) as it's now false by default.

Differential Revision: https://reviews.llvm.org/D84057

This reverts commit 6b55a958.
Temporal revert due to a failing/assertion in test case in Sparc backend.
`test/DebugInfo/Sparc/subreg.ll`
Seen in lot of bots, for instance in:
`http://lab.llvm.org:8011/builders/llvm-clang-x86_64-expensive-checks-win/builds/24679`

This reverts commit 9b2832c0.

Summary:
In the function `target`, memory deallocation and `target_data_end` is called
immediately returning from launching kernel. This might cause a race condition
that the corresponding memory is still being used by the kernel and a potential
issue that when the kernel starts to execute, its required data have already
been deallocated, especially when multiple kernels running concurrently. Since
nevertheless, we will block the thread issuing the target offloading at the end
of the target, we just move the synchronization ahead a little bit to make sure
the correctness.

Reviewers: jdoerfert

Reviewed By: jdoerfert

Subscribers: yaxunl, guansong, sstefan1, openmp-commits

Tags: #openmp

Differential Revision: https://reviews.llvm.org/D84381

This patch refactors the range list table to hold both the range list
table and the location list table.

Reviewed By: jhenderson, labath

Differential Revision: https://reviews.llvm.org/D84239

Summary:
llvm is missing support for DW_OP_implicit_value operation.
DW_OP_implicit_value op is indispensable for cases such as
optimized out long double variables.

For intro refer: DWARFv5 Spec Pg: 40 2.6.1.1.4 Implicit Location Descriptions

Consider the following example:
```
int main() {
        long double ld = 3.14;
        printf("dummy\n");
        ld *= ld;
        return 0;
}
```
when compiled with tunk `clang` as
`clang test.c -g -O1` produces following location description
of variable `ld`:
```
DW_AT_location        (0x00000000:
                     [0x0000000000201691, 0x000000000020169b): DW_OP_constu 0xc8f5c28f5c28f800, DW_OP_stack_value, DW_OP_piece 0x8, DW_OP_constu 0x4000, DW_OP_stack_value, DW_OP_bit_piece 0x10 0x40, DW_OP_stack_value)
                  DW_AT_name    ("ld")
```
Here one may notice that this representation is incorrect(DWARF4
stack could only hold integers(and only up to the size of address)).
Here the variable size itself is `128` bit.
GDB and LLDB confirms this:
```
(gdb) p ld
$1 = <invalid float value>
(lldb) frame variable ld
(long double) ld = <extracting data from value failed>
```

GCC represents/uses DW_OP_implicit_value in these sort of situations.
Based on the discussion with Jakub Jelinek regarding GCC's motivation
for using this, I concluded that DW_OP_implicit_value is most appropriate
in this case.

Link: https://gcc.gnu.org/pipermail/gcc/2020-July/233057.html

GDB seems happy after this patch:(LLDB doesn't have support
for DW_OP_implicit_value)
```
(gdb) p ld
p ld
$1 = 3.14000000000000012434
```

Reviewed By: aprantl

Differential Revision: https://reviews.llvm.org/D83560

A malloc implementation may return a pointer to some allocated space.  It is
undefined for libclang_rt.profile- to access the object - which actually happens
in instrumentTargetValueImpl, where ValueCounters[CounterIndex] may access a
ValueProfNode (from another allocated object) and crashes when the code accesses
the object referenced by CurVNode->Next.

Summary:
This patch lower `!OMP TASKYIELD` construct from PFT to
OpenMPDialect operations.
Construct is lowered with conformance to OpenMP 5.0 spec.

Patch is carved out of following merged PR:
https://github.com/flang-compiler/f18-llvm-project/pull/297

Reviewed: kiranchandramohan

Differential Revision: https://reviews.llvm.org/D84350

Summary:
This patch introduce the basic infrastructure to be able to lower
OpenACC constructs to the future OpenACC dialect.

Reviewers: schweitz, kiranchandramohan, DavidTruby, sscalpone, jdoerfert, ichoyjx

Reviewed By: ichoyjx

Subscribers: ichoyjx, SouraVX, mgorny, jfb, sstefan1, llvm-commits

Tags: #llvm, #flang

Differential Revision: https://reviews.llvm.org/D84195

Summary:
This patch fix a problem where clause needed to be in the allowed set even
they were in the required set. A required clause is allowed obvisouly. This allow
to remove the duplicate in OMP.td

Reviewers: kiranchandramohan, DavidTruby, richard.barton.arm, jdoerfert, sscalpone, kiranktp, ichoyjx

Reviewed By: kiranchandramohan

Subscribers: yaxunl, guansong, sstefan1, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D84353

It turns out that COMPLEX formatted input needs its own runtime APIs
so that null values in list-directed input skip the entire COMPLEX
datum rather than just a real or imaginary part thereof.

Reviewed By: sscalpone

Differential Revision: https://reviews.llvm.org/D84370

Reapply "Try enabling -Wsuggest-override again, using add_compile_options instead of add_compile_definitions for disabling it in unittests/ directories."

add_compile_options is more sensitive to its location in the file than add_definitions--it only takes effect for sources that are added after it. This updated patch ensures that the add_compile_options is done before adding any source files that depend on it.

Using add_definitions caused the flag to be passed to rc.exe on Windows and thus broke Windows builds.

We deprecated mpx feature in 10.0. I left this feature flag
in case someone still had IR files containing the feature
in a target-feature attribute. At the time I think I thought it
would fail the test if the feature couldn't be found. Further
review suggests that at worst it prints a message to
stderr about ignoring the feature.

Since native PDB reading has been implemented for symbolizing,
switch to using the native PDB reader by default, unless
LLVM_ENABLE_DIA_SDK is on.

Bug: https://bugs.llvm.org/show_bug.cgi?id=41795

Differential Revision: https://reviews.llvm.org/D84286

LLVM_TARGET_ARCH is not exported by LLVM so we can't use it from
standalone builds. Default to the architecture in LLVM_HOST_TRIPLE when
no LLDB_DEFAULT_TEST_ARCH was specified.

SAHF/LAHF instructions are always available in 32-bit mode. Early
64-bit capable CPUs made the undefined opcodes in 64-bit mode. This
was changed on later CPUs.

We have a feature flag to control our usage of these instructions.
This feature flag is hooked up to a clang command line option
-msahf/-mno-sahf specifically to give control of the 64-bit mode
behavior.

In the backend X86Subtarget constructor we were explicitly forcing
+sahf into the feature flag string if we were not compiling for
64-bit mode. This was intended to make the predicates always allow
the instructions outside of 64-bit mode. Unfortunately, the way
it was placed into the string allowed -mno-sahf from clang to disable
SAHF instructions in 32-bit mode. This causes an assertion to fire
if you compile a floating point comparison with something like
"-march=pentium -mno-sahf" as our floating point comparison
handling on CPUs that don't support FCOMI/FUCOMI instructions
requires SAHF.

To fix this, this commit restricts the feature flag to only apply to
64-bit mode by ignoring the flag outside 64-bit mode in
X86Subtarget::hasLAHFSAHF(). This way we don't need to mess with
the feature string at all.

Summary:
Support fast16labels in `dfsan_has_label`, and print an error for all
other API functions.

Reviewers: kcc, vitalybuka, pcc

Reviewed By: kcc

Subscribers: jfb, llvm-commits, #sanitizers

Tags: #sanitizers

Differential Revision: https://reviews.llvm.org/D84215

TPCDynamicLibrarySearchGenerator uses a TargetProcessControl instance to
load libraries and search for symbol addresses in a target process. It
can be used in place of a DynamicLibrarySearchGenerator to enable
target-process agnostic lookup.

This reverts commit 4a539faf.

There is a __llvm_profile_instrument_range related crash in PGO-instrumented clang:

```
(gdb) bt
llvm::ConstantRange const&, llvm::APInt const&, unsigned int, bool) ()
llvm::ScalarEvolution::getRangeForAffineAR(llvm::SCEV const*, llvm::SCEV
const*, llvm::SCEV const*, unsigned int) ()
```

(The body of __llvm_profile_instrument_range is inlined, so we can only find__llvm_profile_instrument_target in the trace)

```
 23│    0x000055555dba0961 <+65>:    nopw   %cs:0x0(%rax,%rax,1)
 24│    0x000055555dba096b <+75>:    nopl   0x0(%rax,%rax,1)
 25│    0x000055555dba0970 <+80>:    mov    %rsi,%rbx
 26│    0x000055555dba0973 <+83>:    mov    0x8(%rsi),%rsi  # %rsi=-1 -> SIGSEGV
 27│    0x000055555dba0977 <+87>:    cmp    %r15,(%rbx)
 28│    0x000055555dba097a <+90>:    je     0x55555dba0a76 <__llvm_profile_instrument_target+342>
```

Previously, the vins*vlx instructions were incorrectly defined with i64 as the
second argument. This patches fixes this issue by correcting the second argument
of the vins*vlx instructions/intrinsics to be i32.

Differential Revision: https://reviews.llvm.org/D84277

The input to these functions is a StringRef. We then convert it
to a std::string. Then maybe replace with "generic". I think we
can just overwrite the incoming StringRef with "generic" if needed
and then pass it along without creating any std::string.

- Eliminate `From` which is 0 most of the times.
- Replace 'find_first_of('{') != 0' with 'front() != '{'
- Simplify the loop body given the it executes only when front() == '}'

Differential Revision: https://reviews.llvm.org/D84178

- Update documentation to clarify that `}` does not need to be doubled up.
- Update `EscapedBrace` test case to test this behavior

Differential Revision: https://reviews.llvm.org/D83888

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D84247

Reviewers: efriedma, fpetrogalli, c-rhodes, asbirlea, RKSimon

Reviewed By: RKSimon

Subscribers: tschuett, hiraditya, rkruppe, psnobl, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D81504

Revert "Try enabling -Wsuggest-override again, using add_compile_options instead of add_compile_definitions for disabling it in unittests/ directories."

This reverts commit 388c9fb1.

This patch includes the supporting code that enables always
instrumenting the function entry block by default.

This patch will NOT the default behavior.

It adds a variant bit in the profile version, adds new directives in
text profile format, and changes llvm-profdata tool accordingly.

This patch is a split of D83024 (https://reviews.llvm.org/D83024)
Many test changes from D83024 are also included.

Differential Revision: https://reviews.llvm.org/D84261

This test depends on using the integrated assembler, so make it
explicit by specifying -fintegrated-as.

This patch refactors a small part of the Super Vectorizer code to
a utility so that it can be used independently from the pass. This
aligns vectorization with other utilities that we already have for loop
transformations, such as fusion, interchange, tiling, etc.

Reviewed By: nicolasvasilache

Differential Revision: https://reviews.llvm.org/D84289

This reverts commit e64afefd. It caused
a PGO bootstrapped clang to crash on many source files.

`__llvm_profile_instrument_range` seems to trigger a null pointer dereference.

Call stack:
__llvm_profile_instrument_range
llvm::APInt::udiv(llvm::APInt const&) const
getRangeForAffineARHelper

Summary: These should have half float as the element type

Reviewers: cameron.mcinally, efriedma, sdesmalen, paulwalker-arm

Reviewed By: paulwalker-arm

Subscribers: hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D84211

Try enabling -Wsuggest-override again, using add_compile_options instead of add_compile_definitions for disabling it in unittests/ directories.

Using add_compile_definitions caused the flag to be passed to rc.exe on Windows and thus broke Windows builds.

This is an alternative proposal to D81476 (and D82084) - the details were sufficiently confusing to me it seemed easier to write some code and see how it looks.

Reviewers: SouraVX

Differential Revision: https://reviews.llvm.org/D84278

Eliminates value parameter for types that are not trivially copyable.