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The code for `memcpy` is the same as in #148204 but it fixes the build
bot error by using `static_assert(cpp::always_false<decltype(access)>)`
instead of `static_assert(false)` (older compilers fails on
`static_assert(false)` in `constexpr` `else` bodies).
The code for `memset` is new and vastly improves performance over the
current byte per byte implementation.
Both `memset` and `memcpy` implementations use prefetching for sizes >=
64. This lowers a bit the performance for sizes between 64 and 256 but
improves throughput for greater sizes.
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FP/SIMD (#137592)
Add conditional compilation to add support for AArch64 without vector
registers and/or hardware FPUs by using the generic implementation.
**Context:**
A few functions were hard-coded to use vector registers/hardware FPUs.
This meant that libc would not compile on architectures that did not
support these features. This fix falls back on the generic
implementation if a feature is not supported.
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Summary:
Right now a lot of the memory functions error if we don't have specific
handling for them. This is weird because we have a generic
implementation that should just be used whenever someone hasn't written
a more optimized version. This allows us to use the `libc` headers with
more architectures from the `shared/` directory without worrying about
it breaking.
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The patch primarily cleans up some incorrect includes. The `LIBC_INLINE`
macro is defined in `attributes.h`, not `config.h`. There appears to be
no need to change the CMake and Bazel build files.
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This is a part of #97655.
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declaration" (#98593)
Reverts llvm/llvm-project#98075
bots are broken
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This is a part of #97655.
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Summary:
The GPU build is special in the sense that we always know that
up-to-date `clang` is always going to be the compiler. This allows us to
rely directly on builtins, which allow us to push a lot of this
complexity into the backend. Backend implementations are favored on
the GPU because it allows us to do a lot more target specific
optimizations. This patch changes over the common memory functions to
use builtin versions when building for AMDGPU or NVPTX.
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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
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This patch mostly renames files so it better reflects the function they declare.
Reviewed By: michaelrj
Differential Revision: https://reviews.llvm.org/D155607
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