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969 Commits

Author SHA1 Message Date
Leandro Lacerda
cd19fbad09 [libc] Enable float math functions on the GPU (#151841) 
This patch adds the `tanpif` math functions to the GPU build. It also
adds the `cospif` and `sinpif` math functions to the `math.h` header.
 2025-08-02 22:13:04 -05:00
William Huynh
35a4d8206b [libc] Add atexit to baremetal entrypoints (#147290) 
Part of #145349. Requires #145358. Required by #146863. Once the mutex
has been implemented, we can register functions to be called for exit
with `atexit`.
 2025-07-31 12:16:58 +01:00
William Huynh
82bddc3e64 [libc] Mutex implementation for single-threaded baremetal (#145358) 
Part of https://github.com/llvm/llvm-project/issues/145349. Required to
allow `atexit` to work. As part of `HermeticTestUtils.cpp`, there is a
reference to `atexit()`, which eventually instantiates an instance of a
Mutex.

Instead of copying the implementation from
`libc/src/__support/threads/gpu/mutex.h`, we allow platforms to select
an implementation based on configurations, allowing the GPU and
single-threaded baremetal platforms to share an implementation. This can
be configured or overridden.

Later, when the threading API is more complete, we can add an option to
support multithreading (or set it as the default), but having
single-threading (in tandem) is in line with other libraries for
embedded devices.
 2025-07-31 12:16:44 +01:00
Aiden Grossman
fc5976118d [libc] Add implementation of getcpu syscall wrapper (#150871) 
This patch adds the getcpu syscall wrapper. This has been supported in
glibc since v2.29.
 2025-07-30 09:45:19 -07:00
Uzair Nawaz
a1aba84c2b [libc] Reland #148948 "Implement barriers for pthreads" (#151021) 
Fixed build dependencies for pthread_barrier_t (add __barrier_type to
cmake dependencies)
 2025-07-29 16:39:40 +00:00
sribee8
a653934b58 [libc] Reland wchar string conversion mb to wc (#151048) 
Added crash on nullptr to mbstowcs

---------

Co-authored-by: Sriya Pratipati <sriyap@google.com>
 2025-07-29 16:34:10 +00:00
Krishna Pandey
111edfcab8 [libc][math][c++23] Add fabsbf16 math function (#148398) 
This PR implements fabsbf16 math function for BFloat16 type along with
the tests.

---------

Signed-off-by: krishna2803 <kpandey81930@gmail.com>
Signed-off-by: Krishna Pandey <kpandey81930@gmail.com>
Co-authored-by: OverMighty <its.overmighty@gmail.com>
 2025-07-29 12:19:21 -04:00
sribee8
1381ad497b Revert "[libc] Reland #149423 "wchar string conversion functions mb to wc"" (#151016) 
Reverts llvm/llvm-project#150667
 2025-07-28 18:39:41 +00:00
Uzair Nawaz
a4a0832899 Revert "[libc] Implement barriers for pthreads" (#151014) 
Reverts llvm/llvm-project#148948
 2025-07-28 11:37:23 -07:00
Uzair Nawaz
7ca23754c4 [libc] Implement barriers for pthreads (#148948) 
Implemented barrier synchronization for pthreads
- Uses condition variables internally for platform independence
(platform-specific work is handled by the condition variable
implementation)
- Does NOT currently handle barrierattr pshared, this is a goal for a
future patch
 2025-07-28 11:22:38 -07:00
sribee8
741df45bc3 [libc] Reland #149423 "wchar string conversion functions mb to wc" (#150667) 
Added missing includes in the test files for null check

---------

Co-authored-by: Sriya Pratipati <sriyap@google.com>
 2025-07-28 17:40:10 +00:00
OverMighty
6a85f7cef3 Revert "[libc][math][c23] Implement C23 math function asinpif16" (#150756) 
Reverts llvm/llvm-project#146226

The MPFR test uses `mpfr_asinpi` which requires MPFR 4.2.0 or later, but
the Buildbots are running an older version of MPFR.

See https://lab.llvm.org/buildbot/#/builders/104/builds/27743 for
example.

I said I was going to revert the PR until we have a workaround for older
versions of MPFR, but then I forgot and I just disabled the entrypoints
which doesn't fix the Buildbot builds.
 2025-07-26 15:39:43 +03:00
OverMighty
3ea99a9c7c Revert "[libc][math][c23] Temporarily disable asinpif16 C23 math function" (#150755) 
Reverts llvm/llvm-project#150754

I should have reverted the asinpif16 PR instead of just disabling the
entrypoints.
 2025-07-26 15:32:56 +03:00
OverMighty
7ba62551db [libc][math][c23] Temporarily disable asinpif16 C23 math function (#150754) 
The MPFR test uses `mpfr_asinpi` which requires MPFR 4.2.0 or later, but
the Buildbots are running an older version of MPFR.

See https://lab.llvm.org/buildbot/#/builders/104/builds/27743 for
example.
 2025-07-26 15:10:10 +03:00
Mohamed Emad
eed9b4e058 [libc][math][c23] Implement C23 math function asinpif16 (#146226) 
The function is implemented using the following Taylor series that's
generated using [python-sympy](https://www.sympy.org/en/index.html), and
it is very accurate for |x| $$\in [0, 0.5]$$ and has been verified using
Geogebra. The range reduction is used for the rest range (0.5, 1].

$$
\frac{\arcsin(x)}{\pi} \approx 
\begin{aligned}[t]
    &  0.318309886183791x  \\
    & + 0.0530516476972984x^3 \\
    & + 0.0238732414637843x^5 \\
    & + 0.0142102627760621x^7 \\
    & + 0.00967087327815336x^9 \\
    & + 0.00712127941391293x^{11} \\
    & + 0.00552355646848375x^{13} \\
    & + 0.00444514782463692x^{15} \\
    & + 0.00367705242846804x^{17} \\
    & + 0.00310721681820837x^{19} + O(x^{21})
\end{aligned}
$$

## Geogebra graph

![28-06-2025-1913-eDP-1](https://github.com/user-attachments/assets/f70818e1-1b34-406e-962a-a30fdc909f18)

Closes #132210
 2025-07-26 14:02:18 +03:00
Uzair Nawaz
3f3d779ff8 [libc] Implement mbsinit (#150654) 
Implemented public libc function to check if an mbstate describes an
empty state
 2025-07-25 12:45:24 -07:00
sribee8
42b101d844 Revert "[libc] wchar string conversion functions mb to wc" (#150549) 
Reverts llvm/llvm-project#149423

Failing nullptr crash when using sanitizer
 2025-07-24 23:39:16 +00:00
sribee8
af98a245f8 [libc] wchar string conversion functions mb to wc (#149423) 
Implemented an internal multi-byte to wide character string conversion
function, public functions, and tests

---------

Co-authored-by: Sriya Pratipati <sriyap@google.com>
 2025-07-24 23:10:32 +00:00
Uzair Nawaz
7884c077ff [libc] Implement wcs to mbs family of functions (#149421) 
Implemented internal wcs to mbs internal function + tests
Impelemented wcs to mbs public functions
 2025-07-24 13:15:52 -07:00
Uzair Nawaz
f26c0d00df [libc] Implemented wcsdup libc function (#150453) 
Implemented wcsdup by templating internal strdup function
 2025-07-24 11:29:40 -07:00
sribee8
4f2686e5a1 [libc] Implemented mblen functions (#150141) 
Implemented mblen and mbrlen as well as tests

---------

Co-authored-by: Sriya Pratipati <sriyap@google.com>
 2025-07-24 18:28:25 +00:00
lntue
66603dd1f1 [libc][NFC] Add stdint.h proxy header to fix dependency issue with <stdint.h> includes. (#150303) 
https://github.com/llvm/llvm-project/issues/149993
 2025-07-23 20:19:52 -04:00
Prabhu Rajasekaran
e8182fb501 [libc] add wctype.h header (#149202) 
Add basic configurations to generate wctype.h header file. To begin with
this header file just exposes one function iswalpha.
 2025-07-17 13:06:04 -07:00
Uzair Nawaz
711132dfa4 [libc] Implement widechar to integer public functions (#148683) 
Implement public wchar -> integer public functions using templated
internal wcs_to_integer function
 2025-07-14 13:33:12 -07:00
Petr Hosek
bce3cbc74e [libc] Baremetal version of clock (#146417) 
This is analogous to the baremetal version of timespec_get using the
__llvm_libc_timespec_get_active embedding interface.
 2025-07-12 10:26:51 -07:00
Connector Switch
c3abe3ff22 [libc][math][c23] implement C23 math function tanpif (#147192) 
The smoke test and exhaustive test pass on x86_64 Linux.

Closes #94895.
 2025-07-12 12:39:33 +08:00
sribee8
d5436b0b95 [libc] wcslcat implementation (#146588) 
implemented wcslcat and tests.

---------

Co-authored-by: Sriya Pratipati <sriyap@google.com>
 2025-07-09 23:54:03 +00:00
sribee8
16f046281b [libc] wcslcpy implementation (#146571) 
Implemented wcslcpy and tests.

---------

Co-authored-by: Sriya Pratipati <sriyap@google.com>
 2025-07-09 21:17:16 +00:00
sribee8
47e28d9cd1 [libc] wcscspn implementation (#146158) 
Implemented wcscspn and tests.

---------

Co-authored-by: Sriya Pratipati <sriyap@google.com>
 2025-07-01 15:56:09 +00:00
Uzair Nawaz
7a33b709b1 [libc] wcstok implementation (#145989) 
Implemented wcstok and added tests
 2025-06-30 10:41:00 -07:00
Schrodinger ZHU Yifan
a8f460d1dc [libc] implement sigsetjmp for thumb/thumb2/armv7-a (#138147) 2025-06-30 12:32:14 -04:00
sribee8
ac7e391035 [libc] Implemented wcsnlen (#145610) 
Implemented wcsnlen and tests for the function.

---------

Co-authored-by: Sriya Pratipati <sriyap@google.com>
 2025-06-27 16:51:37 +00:00
Joseph Huber
46c8cc7e51 [libc] Enable all f16 math functions on the GPU (#145813) 
Summary:
This patch adds all the new f16 math functions to the GPU build. These
should all pass except exp2m1f16 on AMDGPU for some reason. I'll
investigate that later.
 2025-06-25 20:03:40 -05:00
Uzair Nawaz
2db0289abe [libc] Implemented wctomb (#145554) 
Implemented wctomb by calling internal wcrtomb function
Added tests
 2025-06-25 13:23:47 -07:00
sribee8
bc5e5c0114 [libc] wcpncpy implementation (#145430) 
Implemented wcpncpy and tests.

---------

Co-authored-by: Sriya Pratipati <sriyap@google.com>
 2025-06-23 23:35:28 +00:00
sribee8
10d46cf0d5 [libc] mbtowc implementation (#145405) 
Implemented mbtowcs and tests for the function.

---------

Co-authored-by: Sriya Pratipati <sriyap@google.com>
 2025-06-23 23:25:13 +00:00
sribee8
b215c8e18f [libc] wcpcpy implementation (#144802) 
Implemented wcpcpy and tests.

---------

Co-authored-by: Sriya Pratipati <sriyap@google.com>
 2025-06-23 18:31:13 +00:00
Uzair Nawaz
a911543437 [libc] Implemented wcrtomb internal function and public libc function (#144596) 
Implemented internal wcrtomb function using the CharacterConverter class
public libc function calls this internal function to perform the
conversion
 2025-06-20 14:43:00 -07:00
sribee8
d078ce7c98 [libc] mbrtowc implementation (#144760) 
implemented the internal and public mbrtowc as well as tests for the
public function.

---------

Co-authored-by: Sriya Pratipati <sriyap@google.com>
 2025-06-20 20:00:59 +00:00
Aly ElAshram
5645d67109 Implement sigsetjmp and siglongjmp for darwin/aarch64 (#139555) 2025-06-19 09:15:59 -04:00
Amy Huang
ca38027c03 Revert "Turn LIBC_COPT_STRING_UNSAFE_WIDE_READ on by default" (#144167) 
Reverts llvm/llvm-project#144163 because for some reason I didn't
realize there are ASan tests.
 2025-06-13 15:30:28 -07:00
Amy Huang
a591bd222b Turn LIBC_COPT_STRING_UNSAFE_WIDE_READ on by default (#144163) 
Configure strlen to use unsafe implementation because it is faster.

Because this is undefined behavior it could cause sanitizers to fail.
 2025-06-13 15:09:57 -07:00
Uzair Nawaz
b184672ec7 [libc] Implemented wmemmove (#142245) 
Implemented wmemmove and added tests
 2025-06-13 16:48:24 +00:00
Michael Jones
5a6a4b6ba6 [libc] Implement perror (#143624) 
The perror function writes an error message directly to stderr. This
patch adds an implementation, tests, and header generation details.
 2025-06-12 10:45:47 -07:00
W. Turner Abney
4039fdb7ba [libc] add ioctl (#141393) 
Closes #85275
Closes #90317
Updates #97191

---------

Co-authored-by: Joseph Huber <huberjn@outlook.com>
Co-authored-by: Michael Jones <michaelrj@google.com>
 2025-06-12 09:20:32 -07:00
lntue
d87eea35fa [libc] Move libc_errno.h to libc/src/__support and make LIBC_ERRNO_MODE_SYSTEM to be header-only. (#143187) 
This is the first step in preparation for:
https://discourse.llvm.org/t/rfc-make-clang-builtin-math-functions-constexpr-with-llvm-libc-to-support-c-23-constexpr-math-functions/86450
 2025-06-11 16:25:27 -04:00
Joseph Huber
525726a520 [libc] Cleanup unimplemented math functions (#143173) 
Summary:
This patch cleans up the leftoever files that were either implemented or
are still unimplemented stubs.
 2025-06-06 12:27:13 -05:00
sribee8
22dd9a2483 [libc] wmemchr implementation (#142640) 
Implemented wmemchr and tests.
Fixes: #121183

---------

Co-authored-by: Sriya Pratipati <sriyap@google.com>
 2025-06-03 17:05:14 -07:00
sribee8
2ff2a076cc [libc] wcsncpy implementation (#142237) 
Implemented wcsncpy and tests for the function.

---------

Co-authored-by: Sriya Pratipati <sriyap@google.com>
 2025-06-03 16:37:14 -07:00
sribee8
3887c23059 [libc] wcscat implementation (#142243) 
Implemented wcscat and tests.

---------

Co-authored-by: Sriya Pratipati <sriyap@google.com>
 2025-06-03 09:58:08 -07:00