This reverts commit a111fb96.

This patch optimizes the transformation of selects to a branch when the heuristics deemed it profitable.
It aggressively sinks eligible instructions to the newly created true/false blocks to prevent their
execution on the common path and interleaves dependence slices to maximize ILP.

Depends on D120232

Reviewed By: davidxl

Differential Revision: https://reviews.llvm.org/D120233

The test specifies a CPU arch but not a particular OS. So if run on
OpenBSD it acts as if it's an OpenBSD/hexagon system. OpenBSD uses
__guard_local instead of __stack_chk_guard so the test will fail. So
specify an OS other than OpenBSD fixes the test.

Reviewed By: MaskRay

Differential Revision: https://reviews.llvm.org/D126265

Exposes interface to free up caching data structure in DWARFDebugLine and DWARFUnit for memory management

This is minimum changes extracted from https://reviews.llvm.org/D78950. The old patch tried to add LRU eviction of caching data structure. Due to multiple layers of interfaces that users could be using, it was not clear where to put the functionality. While we work out on where to put that functionality, it'll be great to add this minimum interface change so that the user could implement their own memory management. More specifically:

* Add a clearLineTable method for DWARFDebugLine which erases the given offset from the LineTableMap.
* DWARFDebugContext adds the clearLineTableForUnit method that leverages clearLineTable to remove the object corresponding to a given compile unit, for memory management purposes. When it is referred to again, the line table object will be repopulated.

Reviewed By: dblaikie

Differential Revision: https://reviews.llvm.org/D90006

Added a separate check for unevaluated statements. Updated InfiniteLoopCheck to use new check

Differential Revision: https://reviews.llvm.org/D126246

Differential Revision: https://reviews.llvm.org/D126034

This is a preparatory patch for the MDNode resize functionality.

Reviewed By: dexonsmith

Differential Revision: https://reviews.llvm.org/D125994

This patch adds the loop-level heuristics for determining whether branches are more profitable than conditional moves.
These heuristics apply to only inner-most loops.

Depends on D120231

Reviewed By: davidxl

Differential Revision: https://reviews.llvm.org/D120232

This patch adds the base heuristics for determining whether branches are more profitable than conditional moves.
Base heuristics apply to all code apart from inner-most loops.

Depends on D122259

Reviewed By: davidxl

Differential Revision: https://reviews.llvm.org/D120231

- fixed inconsistent indents and spaces
- prevent extraneous formatting changes in other patches

Differential Revision: https://reviews.llvm.org/D126262

The binding names of inner procedures with BIND(C) are not exposed
to the loader and should be ignored for potential conflict errors.

Differential Revision: https://reviews.llvm.org/D126141

Intrinsic module names are not in the user's namespace, so they
are free to declare global names that conflict with intrinsic
modules.

Differential Revision: https://reviews.llvm.org/D126140

Make old JIT ExecutionEngine tests unsupported for RISCV, like many other architectures included.

Reviewed By: reames

Differential Revision: https://reviews.llvm.org/D126188

The character length value in the derived type component information table
entry is already in units of characters, not bytes, so don't divide by the
per-character byte size.

Differential Revision: https://reviews.llvm.org/D126139

It turns out we were already allocating static address space for TLS
data along with the non-TLS static data, but this space was going
unused/ignored.

With this change, we include the TLS segment in `__wasm_init_memory`
(which does the work of loading the passive segments into memory when a
module is first loaded).  We also set the `__tls_base` global to point
to the start of this segment.

This means that the runtime can use this static copy of the TLS data for
the first/primary thread if it chooses, rather than doing a runtime
allocation prior to calling `__wasm_init_tls`.

Practically speaking, this will allow emscripten to avoid dynamic
allocation of TLS region on the main thread.

Differential Revision: https://reviews.llvm.org/D126107

Fixes a bug preventing moving the loop's metadata to an outer loop's header,
which happens if the loop's exit is also the header of an outer loop.

Adjusts test for above.

Fixes #55416.

Differential Revision: https://reviews.llvm.org/D125574

Adds a test to expose #55416.

Differential Revision: https://reviews.llvm.org/D125696

A new hidden option -print-on-crash that prints the IR as it was upon entering
the last pass when there is a crash.

The IR is saved in its print form before each pass is started and a
signal handler is registered.  If the compilation crashes, the signal
handler will print the saved IR to dbgs().  This option
can be modified using -print-module-scope to get the IR for the complete
module.  Note that this option only works with the new pass manager.

Reviewed By: yrouban

Differential Revision: https://reviews.llvm.org/D86657

As discussed in https://discourse.llvm.org/t/creating-a-new-repository-for-release-branch-pull-requests/61339

Reviewed By: asl

Differential Revision: https://reviews.llvm.org/D125851

utils looks different from the other directory names
in the docs, see
https://libc.llvm.org/source_layout.html#the-utils-directory

Differential revision: https://reviews.llvm.org/D126211

Fixup for https://reviews.llvm.org/D73044
String literal has an implicit terminator '\0'. This commit adjusts char array
to long literal.

This causes difference of artifacts between -long-string-literals=true
and false.

Differential Revision: https://reviews.llvm.org/D126136

Previous patch (https://reviews.llvm.org/D126013) added a new "optimized"
attribute to DAP stack frame this caused some tests, like
lldb-vscode/coreFile/TestVSCode_coreFile.py
to fail because the tests explicitly check for all attributes.

To fix the test failure I decided to remove this attribute.

Differential Revision: https://reviews.llvm.org/D126225

Differential Revision: https://reviews.llvm.org/D126135

Currently, llvm-symbolizer doesn't like to parse .debug_info in order to
show the line info for global variables. addr2line does this. In the
future, I'm looking to migrate AddressSanitizer off of internal metadata
over to using debuginfo, and this is predicated on being able to get the
line info for global variables.

This patch adds the requisite support for getting the line info from the
.debug_info section for symbolizing global variables. This only happens
when you ask for a global variable to be symbolized as data.

Reviewed By: dblaikie

Differential Revision: https://reviews.llvm.org/D123538

This patch implements the actual transformation of selects to branches.
It includes only the base transformation without any sinking.

Depends on D120230

Reviewed By: davidxl

Differential Revision: https://reviews.llvm.org/D122259

RAGreedy has two fields of RegisterClassInfo, one called RCI and another RegClassInfo from its base class.
RCI is initialized without freezeReservedRegs first, while RegClassInfo does. Therefore, if reserved registers
information is changed between last time freezeReservedRegs is called and RAGreedy, it's not picked up by RCI.
Instead of having both fields in RAGreedy, remove RCI and use RegClassInfo instead. Also removed is the TRI field
which is present in its base class.

Reviewed By: MatzeB

Differential Revision: https://reviews.llvm.org/D125926

The new test is a copy of the corresponding PS4 test, with the triple
etc updated, because there's currently no good way to make one lit test
"iterate" with multiple targets.

This is essentially a revert of c7ad0200. Indeed, it seems that both
96dbdd75 and c7ad0200 were committed, but c7ad0200 seems to be only
an older version of 96dbdd75's tests.

The tests actually require the target triple to match the host, rather than just having the host in the list of available targets. This change removes `llvm_has_native_target` and instead uses the `native` feature from the lit configuration.

Reviewed By: stellaraccident

Differential Revision: https://reviews.llvm.org/D126011

The new tests contain examples where shuffles are free, because indexed
fma instructions can be used.

Builds UserIgnore list only once as a SmallDenseSet without rebuilding
it between the runs, iterate over gathers instead list of reduction ops,
do some checks in the buildTree_rec only if the corresponding containers
  are not empty.

Differential Revision: https://reviews.llvm.org/D126229

Reviewed By: ldionne, #libc

Spies: sstefan1, libcxx-commits

Differential Revision: https://reviews.llvm.org/D126167