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transformation directive and "looprange" clause (#139293)
This change implements the fuse directive, `#pragma omp fuse`, as specified in the OpenMP 6.0, along with the `looprange` clause in clang.
This change also adds minimal stubs so flang keeps compiling (a full implementation in flang of this directive is still pending).
---------
Co-authored-by: Roger Ferrer Ibanez <roger.ferrer@bsc.es>
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In SPIR-V, kernel arguments are not allowed to be in the Generic AS, in
both Intel's internal SPIR-V offloading implementation as well as
HIPSPV, `CrossWorkgroup` AS1 is used. Do the same for OMPSPV.
Currently with Generic AS the `llvm-spirv` translator blows up if we are
using it, and if not, the GPU runtime blows up.
To get the existing logic to set the correct AS to kick in, we need to
know if the function is a kernel or not at the time we first create the
function that may end up as the kernel.
I use the existing `arrangeSYCLKernelCallerDeclaration` function to do
the right kernel ABI computation, but since the function is not specific
to SYCL anymore because I merged all the device kernel clang attributes
into one.
Rename the function to be accurate to the current behavior,
`arrangeDeviceKernelCallerDeclaration`.
---------
Signed-off-by: Sarnie, Nick <nick.sarnie@intel.com>
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This implements support for [named
loops](https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3355.htm) for
C2y.
When parsing a `LabelStmt`, we create the `LabeDecl` early before we parse
the substatement; this label is then passed down to `ParseWhileStatement()`
and friends, which then store it in the loop’s (or switch statement’s) `Scope`;
when we encounter a `break/continue` statement, we perform a lookup for
the label (and error if it doesn’t exist), and then walk the scope stack and
check if there is a scope whose preceding label is the target label, which
identifies the jump target.
The feature is only supported in C2y mode, though a cc1-only option
exists for testing (`-fnamed-loops`), which is mostly intended to try
and make sure that we don’t have to refactor this entire implementation
when/if we start supporting it in C++.
---------
Co-authored-by: Balazs Benics <benicsbalazs@gmail.com>
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(#154618)
In 29992cfd628ed5b968ccb73b17ed0521382ba317 (#145967) support was added
for "trap reasons" on traps emitted in UBSan in trapping mode (e.g.
`-fsanitize-trap=undefined`). This improved the debugging experience by
attaching the reason for trapping as a string on the debug info on trap
instructions. Consumers such as LLDB can display this trap reason string
when the trap is reached.
A limitation of that patch is that the trap reason string is hard-coded
for each `SanitizerKind` even though the compiler actually has much more
information about the trap available at compile time that could be shown
to the user.
This patch is an incremental step in fixing that. It consists of two
main steps.
**1. Introduce infrastructure for building trap reason strings**
To make it convenient to construct trap reason strings this patch
re-uses Clang's powerful diagnostic infrastructure to provide a
convenient API for constructing trap reason strings. This is achieved
by:
* Introducing a new `Trap` diagnostic kind to represent trap diagnostics
in TableGen files.
* Adding a new `Trap` diagnostic component. While this part probably
isn't technically necessary it seemed like I should follow the existing
convention used by the diagnostic system.
* Adding `DiagnosticTrapKinds.td` to describe the different trap
reasons.
* Add the `TrapReasonBuilder` and `TrapReason` classes to provide an
interface for constructing trap reason strings and the trap category.
Note this API while similar to `DiagnosticBuilder` has different
semantics which are described in the code comments. In particular the
behavior when the destructor is called is very different.
* Adding `CodeGenModule::BuildTrapReason()` as a convenient constructor
for the `TrapReasonBuilder`.
This use of the diagnostic system is a little unusual in that the
emitted trap diagnostics aren't actually consumed by normal diagnostic
consumers (e.g. the console). Instead the `TrapReasonBuilder` is just
used to format a string, so in effect the builder is somewhat analagous
to "printf". However, re-using the diagnostics system in this way brings
a several benefits:
* The powerful diagnostic templating languge (e.g. `%select`) can be
used.
* Formatting Clang data types (e.g. `Type`, `Expr`, etc.) just work
out-of-the-box.
* Describing trap reasons in tablegen files opens the door for
translation to different languages in the future.
* The `TrapReasonBuilder` API is very similar to `DiagnosticBuilder`
which makes it easy to use by anyone already familiar with Clang's
diagnostic system.
While UBSan is the first consumer of this new infrastructure the intent
is to use this to overhaul how trap reasons are implemented in the
`-fbounds-safety` implementation (currently exists downstream).
**2. Apply the new infrastructure to UBSan checks for arithmetic
overflow**
To demonstrate using `TrapReasonBuilder` this patch applies it to UBSan
traps for arithmetic overflow. The intention is that we would
iteratively switch to using the `TrapReasonBuilder` for all UBSan traps
where it makes sense in future patches.
Previously for code like
```
int test(int a, int b) { return a + b; }
```
The trap reason string looked like
```
Undefined Behavior Sanitizer: Integer addition overflowed
```
now the trap message looks like:
```
Undefined Behavior Sanitizer: signed integer addition overflow in 'a + b'
```
This string is much more specific because
* It explains if signed or unsigned overflow occurred
* It actually shows the expression that overflowed
One possible downside of this approach is it may blow up Debug info size
because now there can be many more distinct trap reason strings. To
allow users to avoid this a new driver/cc1 flag
`-fsanitize-debug-trap-reasons=` has been added which can either be
`none` (disable trap reasons entirely), `basic` (use the per
`SanitizerKind` hard coded strings), and `detailed` (use the new
expressive trap reasons implemented in this patch). The default is
`detailed` to give the best out-of-the-box debugging experience. The
existing `-fsanitize-debug-trap-reasons` and
`-fno-sanitize-debug-trap-reasons` have been kept for compatibility and
are aliases of the new flag with `detailed` and `none` arguments passed
respectively.
rdar://158612755
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This reintroduces `Type.h`, having earlier been renamed to `TypeBase.h`,
as a redirection to `TypeBase.h`, and redirects most users to include
the former instead.
This is a preparatory patch for being able to provide inline definitions
for `Type` methods which would otherwise cause a circular dependency
with `Decl{,CXX}.h`.
Doing these operations into their own NFC patch helps the git rename
detection logic work, preserving the history.
This patch makes clang just a little slower to build (~0.17%), just
because it makes more code indirectly include `DeclCXX.h`.
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This is a preparatory patch, to be able to provide inline definitions
for `Type` functions which depend on `Decl{,CXX}.h`. As the latter also
depends on `Type.h`, this would not be possible without some
reorganizing.
Splitting this rename into its own patch allows git to track this as a
rename, and preserve all git history, and not force any code
reformatting.
A later NFC patch will reintroduce `Type.h` as redirection to
`TypeBase.h`, rewriting most places back to directly including `Type.h`
instead of `TypeBase.h`, leaving only a handful of places where this is
necessary.
Then yet a later patch will exploit this by making more stuff inline.
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This changes a bunch of places which use getAs<TagType>, including
derived types, just to obtain the tag definition.
This is preparation for #155028, offloading all the changes that PR used
to introduce which don't depend on any new helpers.
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Fixes a bug on AMDGPU targets where a pointer was stored as address
space 5, but then loaded as address space 0.
Issue found as part of [Kokkos](https://github.com/kokkos/kokkos)
testing, specifically `hip.atomics` (see
[core/unit_test/TestAtomics.hpp](https://github.com/kokkos/kokkos/blob/develop/core/unit_test/TestAtomics.hpp)).
Issue was introduced by commit
[39ec9de7c230](https://github.com/llvm/llvm-project/commit/39ec9de7c230)
- [clang][CodeGen] sret args should always point to the alloca AS, so
use that (https://github.com/llvm/llvm-project/pull/114062).
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The cleanup structs expect that pointers and (u)int64_t have the same
alignment requirements, which isn't true on sparc32, which causes
SIGBUSes.
See also: https://github.com/llvm/llvm-project/issues/66620
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This is a major change on how we represent nested name qualifications in
the AST.
* The nested name specifier itself and how it's stored is changed. The
prefixes for types are handled within the type hierarchy, which makes
canonicalization for them super cheap, no memory allocation required.
Also translating a type into nested name specifier form becomes a no-op.
An identifier is stored as a DependentNameType. The nested name
specifier gains a lightweight handle class, to be used instead of
passing around pointers, which is similar to what is implemented for
TemplateName. There is still one free bit available, and this handle can
be used within a PointerUnion and PointerIntPair, which should keep
bit-packing aficionados happy.
* The ElaboratedType node is removed, all type nodes in which it could
previously apply to can now store the elaborated keyword and name
qualifier, tail allocating when present.
* TagTypes can now point to the exact declaration found when producing
these, as opposed to the previous situation of there only existing one
TagType per entity. This increases the amount of type sugar retained,
and can have several applications, for example in tracking module
ownership, and other tools which care about source file origins, such as
IWYU. These TagTypes are lazily allocated, in order to limit the
increase in AST size.
This patch offers a great performance benefit.
It greatly improves compilation time for
[stdexec](https://github.com/NVIDIA/stdexec). For one datapoint, for
`test_on2.cpp` in that project, which is the slowest compiling test,
this patch improves `-c` compilation time by about 7.2%, with the
`-fsyntax-only` improvement being at ~12%.
This has great results on compile-time-tracker as well:
This patch also further enables other optimziations in the future, and
will reduce the performance impact of template specialization resugaring
when that lands.
It has some other miscelaneous drive-by fixes.
About the review: Yes the patch is huge, sorry about that. Part of the
reason is that I started by the nested name specifier part, before the
ElaboratedType part, but that had a huge performance downside, as
ElaboratedType is a big performance hog. I didn't have the steam to go
back and change the patch after the fact.
There is also a lot of internal API changes, and it made sense to remove
ElaboratedType in one go, versus removing it from one type at a time, as
that would present much more churn to the users. Also, the nested name
specifier having a different API avoids missing changes related to how
prefixes work now, which could make existing code compile but not work.
How to review: The important changes are all in
`clang/include/clang/AST` and `clang/lib/AST`, with also important
changes in `clang/lib/Sema/TreeTransform.h`.
The rest and bulk of the changes are mostly consequences of the changes
in API.
PS: TagType::getDecl is renamed to `getOriginalDecl` in this patch, just
for easier to rebasing. I plan to rename it back after this lands.
Fixes #136624
Fixes https://github.com/llvm/llvm-project/issues/43179
Fixes https://github.com/llvm/llvm-project/issues/68670
Fixes https://github.com/llvm/llvm-project/issues/92757
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(#152634)
`CodeGenFunction::EmitPointerArithmetic` is needed by
https://github.com/llvm/llvm-project/pull/152575. Separate the NFC
changes into a new PR for smooth review.
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Now that #149310 has restricted lifetime intrinsics to only work on
allocas, we can also drop the explicit size argument. Instead, the size
is implied by the alloca.
This removes the ability to only mark a prefix of an alloca alive/dead.
We never used that capability, so we should remove the need to handle
that possibility everywhere (though many key places, including stack
coloring, did not actually respect this).
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This is an RAII object and static analysis was flagging it for not
following the rule of three (or five).
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- **Reapply "[HLSL][SPIRV] Add vk::constant_id attribute." (#144812)**
- **Fix memory leak.**
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Reverts llvm/llvm-project#143544
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The vk::constant_id attribute is used to indicate that a global const
variable
represents a specialization constant in SPIR-V. This PR adds this
attribute to clang.
The documentation for the attribute is
[here](https://github.com/microsoft/DirectXShaderCompiler/blob/main/docs/SPIR-V.rst#specialization-constants).
The strategy is to to modify the initializer to get the value of a
specialize constant for a builtin defined in the SPIR-V backend.
Implements https://github.com/llvm/wg-hlsl/pull/287
Fixes https://github.com/llvm/llvm-project/issues/142448
---------
Co-authored-by: Nathan Gauër <github@keenuts.net>
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This extends https://github.com/llvm/llvm-project/pull/138577 to more UBSan checks, by changing SanitizerDebugLocation (formerly SanitizerScope) to add annotations if enabled for the specified ordinals.
Annotations will use the ordinal name if there is exactly one ordinal specified in the SanitizerDebugLocation; otherwise, it will use the handler name.
Updates the tests from https://github.com/llvm/llvm-project/pull/141814.
---------
Co-authored-by: Vitaly Buka <vitalybuka@google.com>
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This patch is part of a stack that teaches Clang to generate Key Instructions
metadata for C and C++.
When returning a value, stores to the `retval` allocas and branches to `return`
block are put in the same atom group. They are both rank 1, which could in
theory introduce an extra step in some optimized code. This low risk currently
feels an acceptable for keeping the code a bit simpler (as opposed to adding
scaffolding to make the store rank 2).
In the case of a single return (no control flow) the return instruction inherits
the atom group of the branch to the return block when the blocks get folded
togather.
RFC:
https://discourse.llvm.org/t/rfc-improving-is-stmt-placement-for-better-interactive-debugging/82668
The feature is only functional in LLVM if LLVM is built with CMake flag
LLVM_EXPERIMENTAL_KEY_INSTRUCTIONs. Eventually that flag will be removed.
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The InstrProf headers are very expensive. Avoid including them in all of
CodeGen/ by moving the CodeGenPGO member behind a unqiue_ptr.
This reduces clang build time by 0.8%.
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This patch is part of a stack that teaches Clang to generate Key Instructions
metadata for C and C++.
RFC:
https://discourse.llvm.org/t/rfc-improving-is-stmt-placement-for-better-interactive-debugging/82668
The feature is only functional in LLVM if LLVM is built with CMake flag
LLVM_EXPERIMENTAL_KEY_INSTRUCTIONs. Eventually that flag will be removed.
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This patch is part of a stack that teaches Clang to generate Key Instructions
metadata for C and C++.
RFC:
https://discourse.llvm.org/t/rfc-improving-is-stmt-placement-for-better-interactive-debugging/82668
The feature is only functional in LLVM if LLVM is built with CMake flag
LLVM_EXPERIMENTAL_KEY_INSTRUCTIONs. Eventually that flag will be removed.
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This is a scoped helper similar to ApplyDebugLocation that creates a new source
location atom group which instructions can be added to.
A source atom is a source construct that is "interesting" for debug stepping
purposes. We use an atom group number to track the instruction(s) that implement
the functionality for the atom, plus backup instructions/source locations.
This patch is part of a stack that teaches Clang to generate Key Instructions
metadata for C and C++.
RFC:
https://discourse.llvm.org/t/rfc-improving-is-stmt-placement-for-better-interactive-debugging/82668
The feature is only functional in LLVM if LLVM is built with CMake flag
LLVM_EXPERIMENTAL_KEY_INSTRUCTIONs. Eventually that flag will be removed.
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(#139809)
This connects the -fsanitize-annotate-debug-info plumbing (https://github.com/llvm/llvm-project/pull/138577) to CFI check codegen, using SanitizerAnnotateDebugInfo() (https://github.com/llvm/llvm-project/pull/139965) and SanitizerInfoFromCFIKind (https://github.com/llvm/llvm-project/pull/140117).
Note: SanitizerAnnotateDebugInfo() is updated to a public function because it is needed in ItaniumCXXABI.
Updates the tests from https://github.com/llvm/llvm-project/pull/139149.
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This generalizes the debug info annotation code from https://github.com/llvm/llvm-project/pull/139149 and moves it into a helper function, SanitizerAnnotateDebugInfo().
Future work can use 'ApplyDebugLocation ApplyTrapDI(*this, SanitizerAnnotateDebugInfo(Ordinal));' to add annotations to additional checks.
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The 'counted_by' attribute is now available for pointers in structs.
It generates code for sanity checks as well as
__builtin_dynamic_object_size()
calculations. For example:
struct annotated_ptr {
int count;
char *buf __attribute__((counted_by(count)));
};
If the pointer's type is 'void *', use the 'sized_by' attribute, which
works similarly to 'counted_by', but can handle the 'void' base type:
struct annotated_ptr {
int count;
void *buf __attribute__((sized_by(count)));
};
If the 'count' field member occurs after the pointer, use the
'-fexperimental-late-parse-attributes' flag during compilation.
Note that 'counted_by' cannot be applied to a pointer to an incomplete
type, because the size isn't known.
struct foo;
struct annotated_ptr {
int count;
struct foo *buf __attribute__((counted_by(count))); /* invalid */
};
Signed-off-by: Bill Wendling <morbo@google.com>
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This fixes emitting undefined behavior where a 64-bit generic
pointer is written to a 32-bit slot allocated for a private pointer.
This can be seen in test/CodeGenOpenCL/amdgcn-automatic-variable.cl's
wrong_pointer_alloca.
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CGAtomicOptionsRAII (#137275)
Static analysis flagged CGAtomicOptionsRAII as having an explicit
destructor but not having explicit copy ctor and assignment. Rule of
three says we should. We are just using this as an RAII object, no need
for either so they will be specified as deleted.
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recoverable ubsan handlers" (#136402)
Reverts llvm/llvm-project#135135
Breaks several bots, details in #135135.
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ubsan handlers (#135135)
This patch relands https://github.com/llvm/llvm-project/pull/130990.
If the check value is passed by reference, add `memory(read)`.
Original PR description:
This patch adds `memory(argmem: read, inaccessiblemem: readwrite)` to
**recoverable** ubsan handlers in order to unblock some
memory/loop optimizations. It provides an average of 3% performance
improvement on llvm-test-suite (except for 49 test failures due to ubsan
diagnostics).
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The qualifier allows programmer to directly control how pointers are
signed when they are stored in a particular variable.
The qualifier takes three arguments: the signing key, a flag specifying
whether address discrimination should be used, and a non-negative
integer that is used for additional discrimination.
```
typedef void (*my_callback)(const void*);
my_callback __ptrauth(ptrauth_key_process_dependent_code, 1, 0xe27a) callback;
```
Co-Authored-By: John McCall rjmccall@apple.com
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(#133546)
Fixes #131476.
For `x86_64` it folds
```
movzbl t1(%rip), %eax
andb $1, %al
```
into
```
movzbl t1(%rip), %eax
```
when run: `clang -S atomic-ops-load.c -o atomic-ops-load.s -O1
--target=x86_64`.
But for riscv replaces:
```
lb a0, %lo(t1)(a0)
andi a0, a0, 1
```
with
```
lb a0, %lo(t1)(a0)
zext.b a0, a0
```
when run: `clang -S atomic-ops-load.c -o atomic-ops-load.s -O1
--target=riscv64`.
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when the base pointer is null (#130952)
See also https://github.com/llvm/llvm-project/pull/130734 for the
original motivation.
This pattern (`container_of`) is also widely used by real-world
programs.
Examples:
https://github.com/llvm/llvm-project/blob/1d89d7d5d76e391b035f50343e2a4890506c6f2b/llvm/include/llvm/IR/SymbolTableListTraits.h#L77-L87
https://github.com/nodejs/node/blob/a2a53cb728ec5f776ac16879ce0f480a8e838320/src/util-inl.h#L134-L137
https://github.com/search?q=*%29nullptr-%3E*&type=code
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pointers (#130734)
In the LLVM middle-end we want to fold `gep inbounds null, idx -> null`:
https://alive2.llvm.org/ce/z/5ZkPx-
This pattern is common in real-world programs
(https://github.com/dtcxzyw/llvm-opt-benchmark/pull/55#issuecomment-1870963906).
Generally, it exists in some (actually) unreachable blocks, which is
introduced by JumpThreading.
However, some old-style offsetof macros are still widely used in
real-world C/C++ code (e.g., hwloc/slurm/luajit). To avoid breaking
existing code and inconvenience to downstream users, this patch removes
the inbounds flag from the struct gep if the base pointer is null.
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This feature largely models the same behavior as in C++11. It is
technically a breaking change between C99 and C11, so the paper is not
being backported to older language modes.
One difference between C++ and C is that things which are rvalues in C
are often lvalues in C++ (such as the result of a ternary operator or a
comma operator).
Fixes #96486
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Patches in the Key Instructions (KeyInstr) stack need to access CGF in these
functions. 2 CGF fields are passed to these functions already; at this point it
felt natural to promote them to CGF methods.
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- fixes #132303
- Moves dot2add from a language builtin to a target builtin.
- Sets the scaffolding for Sema checks for DX builtins
- Setup DirectX backend as able to have target builtins
- Adds a DX TargetBuiltins emitter in
`clang/lib/CodeGen/TargetBuiltins/DirectX.cpp`
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This is an expensive header, only include it where needed. Move some
functions out of line to achieve that.
This reduces time to build clang by ~0.5% in terms of instructions
retired.
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(#127043)
Currently arm_neon.h emits C-style casts to do vector type casts. This
relies on implicit conversion between vector types to be enabled, which
is currently deprecated behaviour and soon will disappear. To ensure
NEON code will keep working afterwards, this patch changes all this
vector type casts into bitcasts.
Co-authored-by: Momchil Velikov <momchil.velikov@arm.com>
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(#130228)
This implements the R2 semantics of P0963.
The R1 semantics, as outlined in the paper, were introduced in Clang 6.
In addition to that, the paper proposes swapping the evaluation order of
condition expressions and the initialization of binding declarations
(i.e. std::tuple-like decompositions).
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This statement level construct takes no clauses and has no associated
statement, and simply labels a number of array elements as valid for
caching. The implementation here is pretty simple, but it is a touch of
a special case for parsing, so the parsing code reflects that.
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Add option and statement attribute for controlling emitting of
target-specific
metadata to atomicrmw instructions in IR.
The RFC for this attribute and option is
https://discourse.llvm.org/t/rfc-add-clang-atomic-control-options-and-pragmas/80641,
Originally a pragma was proposed, then it was changed to clang
attribute.
This attribute allows users to specify one, two, or all three options
and must be applied
to a compound statement. The attribute can also be nested, with inner
attributes
overriding the options specified by outer attributes or the target's
default
options. These options will then determine the target-specific metadata
added to atomic
instructions in the IR.
In addition to the attribute, three new compiler options are introduced:
`-f[no-]atomic-remote-memory`, `-f[no-]atomic-fine-grained-memory`,
`-f[no-]atomic-ignore-denormal-mode`.
These compiler options allow users to override the default options
through the
Clang driver and front end. `-m[no-]unsafe-fp-atomics` is aliased to
`-f[no-]ignore-denormal-mode`.
In terms of implementation, the atomic attribute is represented in the
AST by the
existing AttributedStmt, with minimal changes to AST and Sema.
During code generation in Clang, the CodeGenModule maintains the current
atomic options,
which are used to emit the relevant metadata for atomic instructions.
RAII is used
to manage the saving and restoring of atomic options when entering
and exiting nested AttributedStmt.
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This PR implements HLSL's initialization list behvaior as specified in
the draft language specifcation under
[*Decl.Init.Agg*](https://microsoft.github.io/hlsl-specs/specs/hlsl.html#Decl.Init.Agg).
This behavior is a bit unusual for C/C++ because intermediate braces in
initializer lists are ignored and a whole array of additional
conversions occur unintuitively to how initializaiton works in C.
The implementaiton in this PR generates a valid C/C++ initialization
list AST for the HLSL initializer so that there are no changes required
to Clang's CodeGen to support this. This design will also allow us to
use Clang's rewrite to convert HLSL initializers to valid C/C++
initializers that are equivalent. It does have the downside that it will
generate often redundant accesses during codegen. The IR optimizer is
extremely good at eliminating those so this will have no impact on the
final executable performance.
There is some opportunity for optimizing the initializer list generation
that we could consider in subsequent commits. One notable opportunity
would be to identify aggregate objects that occur in the same place in
both initializers and do not require converison, those aggregates could
be initialized as aggregates rather than fully scalarized.
Closes #56067
---------
Co-authored-by: Finn Plummer <50529406+inbelic@users.noreply.github.com>
Co-authored-by: Helena Kotas <hekotas@microsoft.com>
Co-authored-by: Justin Bogner <mail@justinbogner.com>
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This patch was reviewed and approved here:
https://github.com/llvm/llvm-project/pull/119891
However it has been reverted here:
https://github.com/alejandro-alvarez-sonarsource/llvm-project/commit/083df25dc256154cccbc0e127d79fbac4d0583c5
due to a build issue here:
https://lab.llvm.org/buildbot/#/builders/51/builds/10694
This patch is reintroducing the support.
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These files are relatively old and don't confront our formatting rules.
It's hard to change them without massive clang-format changes.
---------
Signed-off-by: Peter Rong <PeterRong@meta.com>
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This reverts commit 070f84ebc89b11df616a83a56df9ac56efbab783.
Buildbot failure:
https://lab.llvm.org/buildbot/#/builders/51/builds/10694
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Implement basic parsing and semantic support for `#pragma omp stripe`
constuct introduced in
https://www.openmp.org/wp-content/uploads/[OpenMP-API-Specification-6-0.pdf](https://www.openmp.org/wp-content/uploads/OpenMP-API-Specification-6-0.pdf),
section 11.7.
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#118842 (#126258)
Implement HLSLElementwiseCast excluding support for splat cases
Do not support casting types that contain bitfields.
Partly closes https://github.com/llvm/llvm-project/issues/100609 and
partly closes https://github.com/llvm/llvm-project/issues/100619
Re-land #118842 after fixing warning as an error, found by a buildbot.
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Reverts llvm/llvm-project#118842
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Implement HLSLElementwiseCast excluding support for splat cases
Do not support casting types that contain bitfields.
Partly closes #100609 and partly closes #100619
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