From bf42a7860a208439a0a29f5dcc7a33949c484efb Mon Sep 17 00:00:00 2001 From: Joseph Huber Date: Tue, 30 Jul 2024 10:15:30 -0500 Subject: [libc] Implement placeholder memory functions on the GPU (#101082) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Summary: These functions are needed for `libc++` to link successfully. We can't implement them well currently, so simply provide some stand-in implementations. `realloc` will currently copy garbage and potentially fault and `aligned_alloc` will work unless your alignment is more than 4K alignment. However, these should work in practice to get tests running. I will write a real allocator soon™. --- libc/src/stdlib/gpu/aligned_alloc.cpp | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 libc/src/stdlib/gpu/aligned_alloc.cpp (limited to 'libc/src/stdlib/gpu/aligned_alloc.cpp') diff --git a/libc/src/stdlib/gpu/aligned_alloc.cpp b/libc/src/stdlib/gpu/aligned_alloc.cpp new file mode 100644 index 000000000000..cd2c7e55128f --- /dev/null +++ b/libc/src/stdlib/gpu/aligned_alloc.cpp @@ -0,0 +1,29 @@ +//===-- GPU Implementation of aligned_alloc -------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "src/stdlib/aligned_alloc.h" + +#include "src/__support/GPU/allocator.h" +#include "src/__support/common.h" +#include "src/__support/macros/config.h" + +namespace LIBC_NAMESPACE_DECL { + +LLVM_LIBC_FUNCTION(void *, aligned_alloc, (size_t alignment, size_t size)) { + if ((alignment & -alignment) != alignment) + return nullptr; + + void *ptr = gpu::allocate(size); + if ((reinterpret_cast(ptr) & (alignment - 1)) != 0) { + gpu::deallocate(ptr); + return nullptr; + } + return ptr; +} + +} // namespace LIBC_NAMESPACE_DECL -- cgit v1.2.3