| 1 | //===-- Implementation for memalignment -------------------------*- C++ -*-===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "src/stdlib/memalignment.h" |
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| 10 | #include "src/__support/CPP/bit.h" |
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| 11 | #include "src/__support/common.h" |
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| 12 | #include "src/__support/macros/config.h" |
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| 13 | |
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| 14 | namespace LIBC_NAMESPACE_DECL { |
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| 15 | |
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| 16 | LLVM_LIBC_FUNCTION(size_t, memalignment, (const void *p)) { |
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| 17 | if (p == nullptr) |
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| 18 | return 0; |
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| 19 | |
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| 20 | uintptr_t addr = reinterpret_cast<uintptr_t>(p); |
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| 21 | |
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| 22 | return size_t(1) << cpp::countr_zero(addr); |
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| 23 | } |
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| 24 | |
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| 25 | } // namespace LIBC_NAMESPACE_DECL |
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| 26 | |
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