[libc] Migrate to using LIBC_NAMESPACE_DECL for namespace declaration (#98597)

This is a part of #97655.

Revert "[libc] Migrate to using LIBC_NAMESPACE_DECL for namespace declaration" (#98593)

Reverts llvm/llvm-project#98075

bots are broken

[libc] Migrate to using LIBC_NAMESPACE_DECL for namespace declaration (#98075)

This is a part of #97655.

[libc][bug] Fix out of bound write in memcpy w/ software prefetching (#90591)

This patch adds tests for `memcpy` and `memset` making sure that we
don't access buffers out of bounds. It relies on PO

[libc][bug] Fix out of bound write in memcpy w/ software prefetching (#90591)

This patch adds tests for `memcpy` and `memset` making sure that we
don't access buffers out of bounds. It relies on POSIX `mmap` /
`mprotect` and works only when FULL_BUILD_MODE is disabled.

The bug showed up while enabling software prefetching.
`loop_and_tail_offset` is always running at least one iteration but in
some configurations loop unrolled prefetching was actually needing only
the tail operation and no loop iterations at all.

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[libc] Mass replace enclosing namespace (#67032)

This is step 4 of
https://discourse.llvm.org/t/rfc-customizable-namespace-to-allow-testing-the-libc-when-the-system-libc-is-also-llvms-libc/73079

[libc][test] Drastically reduce mem test runtime

Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D151450

[libc][NFC] Move UnitTest and IntegrationTest to the 'test' directory.

This part of the effort to make all test related pieces into the `test`
directory. This helps is excluding test related pieces

[libc][NFC] Move UnitTest and IntegrationTest to the 'test' directory.

This part of the effort to make all test related pieces into the `test`
directory. This helps is excluding test related pieces in a straight
forward manner if LLVM_INCLUDE_TESTS is OFF. Future patches will also move
the MPFR wrapper and testutils into the 'test' directory.

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[libc] Improve testing of mem functions

This patch extracts the testing logic from `op_tests.cpp` into
`memory_check_utils.h` so we can reuse it for mem* function integration
tests.

This makes test

[libc] Improve testing of mem functions

This patch extracts the testing logic from `op_tests.cpp` into
`memory_check_utils.h` so we can reuse it for mem* function integration
tests.

This makes testing consistent and thorough.
For instance this catches a bug that got unnoticed during submission of
D136595 and D135134. Integration test for memcmp was only testing a
single size.

This also leverages ASAN to make sure that data is not read / written
outside permitted boundaries

Differential Revision: https://reviews.llvm.org/D136865

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[NFC][libc] Switch mem* tests from ArrayRef to span

Reland [libc][NFC] Use STL case for array

This is a reland of https://reviews.llvm.org/D130773

Revert "[libc][NFC] Use STL case for array"

This reverts commit 7add0e5fdc5c7cb6f59f60cd436bf161cf9f9eb7.

[libc][NFC] Use STL case for array

Migrating all private STL code to the standard STL case but keeping it under the CPP namespace to avoid confusion.

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

[libc][NFC] Use STL case for array

Migrating all private STL code to the standard STL case but keeping it under the CPP namespace to avoid confusion.

Differential Revision: https://reviews.llvm.org/D130773

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[libc] apply formatting to tests

Apply the formatting rules that were applied to the libc/src directory
to the libc/test directory, as well as the files in libc/utils that are
included by the tests.

[libc] apply formatting to tests

Apply the formatting rules that were applied to the libc/src directory
to the libc/test directory, as well as the files in libc/utils that are
included by the tests. This does not include automated enforcement.

Reviewed By: sivachandra, lntue

Differential Revision: https://reviews.llvm.org/D116127

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[libc][NFC] Move utils/CPP to src/__support/CPP.

The idea is to move all pieces related to the actual libc sources to the
"src" directory. This allows downstream users to ship and build just the
"sr

[libc][NFC] Move utils/CPP to src/__support/CPP.

The idea is to move all pieces related to the actual libc sources to the
"src" directory. This allows downstream users to ship and build just the
"src" directory.

Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D112653

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[libc][NFC] add "LlvmLibc" as a prefix to all test names

Summary:
Having a consistent prefix makes selecting all of the llvm libc tests
easier on any platform that is also using the gtest framework.

[libc][NFC] add "LlvmLibc" as a prefix to all test names

Summary:
Having a consistent prefix makes selecting all of the llvm libc tests
easier on any platform that is also using the gtest framework.
This also modifies the TEST and TEST_F macros to enforce this change
moving forward.

Reviewers: sivachandra

Subscribers:

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[libc] Add memset and bzero implementations

Summary: This patch adds general purpose `memset` and `bzero` implementations.

Reviewers: sivachandra, abrachet

Subscribers: mgorny, tschuett, ecnelises

[libc] Add memset and bzero implementations

Summary: This patch adds general purpose `memset` and `bzero` implementations.

Reviewers: sivachandra, abrachet

Subscribers: mgorny, tschuett, ecnelises, libc-commits, courbet

Tags: #libc-project

Differential Revision: https://reviews.llvm.org/D80010

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[libc] Adding memcpy implementation for x86_64

Summary:
The patch is not ready yet and is here to discuss a few options:
- How do we customize the implementation? (i.e. how to define `kRepMovsBSize

[libc] Adding memcpy implementation for x86_64

Summary:
The patch is not ready yet and is here to discuss a few options:
- How do we customize the implementation? (i.e. how to define `kRepMovsBSize`),
- How do we specify custom compilation flags? (We'd need `-fno-builtin-memcpy` to be passed in),
- How do we build? We may want to test in debug but build the libc with `-march=native` for instance,
- Clang has a brand new builtin `__builtin_memcpy_inline` which makes the implementation easy and efficient, but:
- If we compile with `gcc` or `msvc` we can't use it, resorting on less efficient code generation,
- With gcc we can use `__builtin_memcpy` but then we'd need a postprocess step to check that the final assembly do not contain call to `memcpy` (unlikely but allowed),
- For msvc we'd need to resort on the compiler optimization passes.

Reviewers: sivachandra, abrachet

Subscribers: mgorny, MaskRay, tschuett, libc-commits, courbet

Tags: #libc-project

Differential Revision: https://reviews.llvm.org/D74397

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