[libc-commits] [libc] [libc] [search] implement hcreate(_r)/hsearch(_r)/hdestroy(_r) (PR #73469)

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+//===-- HashTable BitMasks Generic Implementation ---------------*- C++ -*-===//
+//
+// 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/__support/endian.h"
+
+namespace LIBC_NAMESPACE {
+namespace internal {
+// Helper function to spread a byte across the whole word.
+// Accumutively, the procedure looks like:
+//    byte                  = 0x00000000000000ff
+//    byte | (byte << 8)    = 0x000000000000ffff
+//    byte | (byte << 16)   = 0x00000000ffffffff
+//    byte | (byte << 32)   = 0xffffffffffffffff
+constexpr static inline uintptr_t repeat_byte(uintptr_t byte) {
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lntue wrote:

Use `LIBC_INLINE constexpr uintptr_t` signature.  The macro `LIBC_INLINE` is defined in `src/__support/macros/attributes.h`

https://github.com/llvm/llvm-project/pull/73469