Summary:
This should be portable to other compilers so it can support Windows
infrastructure.
I don't really use MSVC but godbolt seems happy:
https://godbolt.org/z/Ysdx1Y1rq
This moves the LLVM_LIBC_IS_DEFINED macro to its own header is
__support/macros. Its implementation leverages cpp::string_view
instead of rolling its own strcmp; this necessitated fixing
several missing constexpr in the string_view implementation.
The new __support/macros/macro-utils.h is also broken out to hold
the stringification macro and can be used in future for token
pasting shenanigans and other such generic macro machinery.
Summary:
`Status` is unfortunately heavily overloaded in practice. Things like
X11 define it as a macro. Best to just remove that possibility entirely.
Introduce common infrastructure for runtimes that determines compiler
resource path locations. These variables introduced are:
* RUNTIMES_OUTPUT_RESOURCE_DIR
* RUNTIMES_INSTALL_RESOURCE_PATH
That contain the location for the compiler resource path (typically
`lib/clang/<version>`) in the build tree and the install tree (the
latter relative to CMAKE_INSTALL_PREFIX).
Additionally, define
* RUNTIMES_OUTPUT_RESOURCE_LIB_DIR
* RUNTIMES_INSTALL_RESOURCE_LIB_PATH
as for the location of clang/flang version-locked libraries (typically
`lib${LLVM_LIBDIR_SUFFIX}/<targer-triple>`, but also depends on `APPLE`
and `LLVM_ENABLE_PER_TARGET_RUNTIME_DIR`). This code is moved from
flang-rt and initially becomes its only user.
Refactored out of #171610 as requested
[here](https://github.com/llvm/llvm-project/pull/171610#discussion_r2687382481).
Extracted `get_runtimes_target_libdir_common` from compiler-rt as
requested
[here](https://github.com/llvm/llvm-project/pull/171610#discussion_r2689565634).
Added TODO comments to all runtimes as requested
[here](https://github.com/llvm/llvm-project/pull/171610#issuecomment-3789598635).
Summary:
The RPC headers are completely freestanding and can be installed and
used. This just places them in the standard compiler install directory
along with everything else. We put it under `shared/` so the usage
matches with using the upstream version. People using the installed
version will need to manuall `-isystem` into the include directory, but
this is part for the course for these LLVM extra headers.
Several key targets unconditionally depend on `OSUtil.osutil` target,
causing errors when it is unnecessarily linked, or not available. This
PR fine-tuning the dependency on `OSUtil.osutil` to cleanly decouple
those targets, and gracefully skip targets that need `osutil`. Main
changes include:
* Make `LIBC_COPT_USE_C_ASSERT` to a cmake config, allowing
`LIBC_ASSERT` to use system's `assert` and not depending on `osutil`.
* Adjust cmake dependency for the following targets:
- libc.src.__support.libc_assert
- libc.src.__support.time.*
- libc.src.time.linux.*
- libc.src.unistd.*
- LibcTest
* Give an option for `TestLogger` to use system's `fprintf` instead of
`osutil`.
Some of the functions were missing LIBC_INLINE and some of the variable
names were less descriptive than I liked. This PR fixes both as well as
cleaning up dependencies.
Summary:
Right now the scan checks to avoid the unspecified behavior in
`clzg(0)`. This is used as the source to the shuffle instruction, but
the argument is discarded at zero anyway. So, we simply pass unspecified
behavior to shuffle and then discard it. This should be fine. The scan
routines are expected to be optimal.
Also renames `sum` to `add`.
Get rid of several .h.def files which were used to ensure that the
macro definitions from llvm-libc-macro would be included in the public
header. Replace this logic with YAML instead - add entries to the
"macros" list that point to the correct "macro_header" to ensure it
would be included.
For C standard library headers, list several standard-define macros
to document their availability. For POSIX/Linux headers, only reference
a handful of macro, since more planning is needed to decide how to
represent platform-specific macro in YAML.
The docgen script was previously hardcoded to assume all implemented
macros must be placed in a *-macros.h header. This updates docgen to
read inline macro_value properties directly from the source YAML files,
correctly recognizing them as implemented.
Define the POSIX cpio.h header and its standard macros in the libc build
system. Configure the macros directly in the YAML specification to allow
automated header generation without a custom definition template.
Switches the following headers to hdrgen-produced ones by referencing
some macro from C standard and the file containing the declarations in
corresponding YAML files:
* limits.h (referenced _WIDTH / _MAX / _MIN families).
* locale.h (referenced LC_ family).
* time.h (referenced CLOCKS_PER_SEC).
* wchar.h (referenced WEOF).
Added a brief description of the libc-shared-tests target to the
Building and Testing page.
This target allows running tests for shared standalone components like
math primitives without the full libc runtime.
Fix broken POSIX basedefs links for nested headers in llvm-libc docs.
The docgen script currently emits paths like `sys/wait.h.html`, but the
Open Group uses `sys_wait.h.html`, for example:
-
https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/sys_wait.h.html
This updates nested-header link generation while leaving flat headers
unchanged.
Previously there was a single rule for stdbit, this PR adds generated
header targets for the rest of the linux headers. It also adds a
cc_library
for all of the public headers which also includes the types and macros
headers.
Added a "Building and Testing with an Emulator" section to
full_cross_build.rst using riscv64 and qemu-riscv64 as the example.
Outlined necessary CMake flags for cross-compiling with Clang, including
CMAKE_C_COMPILER_TARGET, CMAKE_CXX_COMPILER_TARGET, and
LLVM_ENABLE_LLD=ON. Switched from CMAKE_SYSROOT to LIBC_KERNEL_HEADERS
and added the gcc-riscv64-linux-gnu package dependency to ensure sysroot
issues on Debian-based systems are avoided while retaining access to
cross-compiler runtime objects.
Explained the self-hosted libc-hermetic-tests target as the required
target for executing tests during a standalone cross build, since the
standard check-libc tests are not hermetic.
Refactored existing CMake examples in full_cross_build.rst to use -S and
-B flags instead of cd and mkdir.
Removed prompt characters from code blocks and separated host
environment setup into explicit code blocks for easier copy-pasting.
Also removed the initial 'cd llvm-project' directory changes to reduce
boilerplate.
Added a cross-reference to the new emulator section in
build_and_test.rst.
Add support for the half-precision complementary error function
`erfcf16``, using a Sollya generated polynomial implementation with
proper handling of special cases.
Extend the MPFR utilities with erfc support to allow tests.
closes: #180927
Updated check-libc-lit to depend only on build-only targets. Added
libc-integration-tests-build to track integration test executables and
updated LLVMLibCTestRules.cmake to populate it.
Removed incorrect dependencies on execution suites in include and
integration tests that were introduced in #184366.
Clean up the `%public_api` printer code slightly - get rid of explicit
`\n` and ensure we only print `__BEGIN_C_DECLS` and `__END_C_DECLS` if
the generated header actually contains functions or objects to declare.
I've noticed that after 27ba9e2a44c11f8123528c350227db2c9a707c8f landed,
generated errno.h header has two blocks of `__BEGIN_C_DECLS` /
`__END_C_DECLS`: an empty one was generated automatically from
`%public_api` section that was intended to only add the `errno_t` type
declaration.
Summary:
We store the locks in local device memory for performance and
simplicity. The number here needs to correspond to the maximum occupancy
so that we never have a situation where a GPU thread is blocking another
GPU thread.
The number now is sufficient for most hardware, but modern compute chips
like the MI300x are already pushing ~12000 resident waves. This has ABI
impliciations so I'd like to bump it up sooner rather than later. The
ABI change is within what OpenMP expects, LLVM major versions, and it
will be caught statically so there's no risk of silent corruption (size
doesn't match).
Summary:
This PR primarily changes using `LLVM_RUNTIMES_TARGET` to
`LLVM_DEFAULT_TARGET_TRIPLE`. The reason is that the default target
triple is the true cross-compiling architecture we are using, while the
runtimes_target can contain multilib strings like `+debug` or similar.
Additionally add the proper path handling to the OpenMP / Offload
libraries.
Added implementing_a_function.rst providing a checklist for adding a new
function to LLVM-libc.
Updated dev/index.rst to include the new guide in the toctree.
- Switch log1pf to use the same log_eval from inverse hyperbolic
functions.
- Optimize log_eval to use the same range reduction scheme as double
precision log
- Reduce the table size needed for log range reduction.
- This lower the overall latency of log1pf and inverse hyperbolic
functions.
