2020-04-10 11:41:22 +08:00
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cmake_minimum_required(VERSION 3.13.4)
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2019-10-05 01:30:54 +08:00
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2020-01-27 13:50:27 +08:00
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# Use old version of target_sources command which converts the source
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# file paths to full paths.
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cmake_policy(SET CMP0076 OLD)
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2019-10-05 01:30:54 +08:00
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list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules")
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# The top-level source directory of libc.
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set(LIBC_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
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# The top-level directory in which libc is being built.
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set(LIBC_BUILD_DIR ${CMAKE_CURRENT_BINARY_DIR})
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# Path libc/scripts directory.
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set(LIBC_BUILD_SCRIPTS_DIR "${LIBC_SOURCE_DIR}/utils/build_scripts")
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set(LIBC_TARGET_OS ${CMAKE_SYSTEM_NAME})
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string(TOLOWER ${LIBC_TARGET_OS} LIBC_TARGET_OS)
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set(LIBC_TARGET_MACHINE ${CMAKE_SYSTEM_PROCESSOR})
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include(CMakeParseArguments)
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include(LLVMLibCRules)
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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`),
- 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
2020-02-11 20:37:02 +08:00
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include(LLVMLibCCheckCpuFeatures)
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2019-10-05 01:30:54 +08:00
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add_subdirectory(src)
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2019-12-05 15:17:14 +08:00
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add_subdirectory(config)
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add_subdirectory(include)
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2019-11-06 03:40:26 +08:00
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add_subdirectory(utils)
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2020-01-04 04:00:45 +08:00
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2020-03-19 03:46:33 +08:00
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# The loader can potentially depend on the library components so add it
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# after the library implementation directories.
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add_subdirectory(loader)
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2020-01-04 04:00:45 +08:00
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# The lib and test directories are added at the very end as tests
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# and libraries potentially draw from the components present in all
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# of the other directories.
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add_subdirectory(lib)
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2020-03-23 13:50:16 +08:00
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if(LLVM_INCLUDE_TESTS)
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add_subdirectory(test)
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add_subdirectory(fuzzing)
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endif()
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