LLVM 20.0.0git
DJB.h
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1//===-- llvm/Support/DJB.h ---DJB Hash --------------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file contains support for the DJ Bernstein hash function.
10//
11//===----------------------------------------------------------------------===//
12
13#ifndef LLVM_SUPPORT_DJB_H
14#define LLVM_SUPPORT_DJB_H
15
16#include "llvm/ADT/StringRef.h"
17
18namespace llvm {
19
20/// The Bernstein hash function used by the DWARF accelerator tables.
21inline uint32_t djbHash(StringRef Buffer, uint32_t H = 5381) {
22 for (unsigned char C : Buffer.bytes())
23 H = (H << 5) + H + C;
24 return H;
25}
26
27/// Computes the Bernstein hash after folding the input according to the Dwarf 5
28/// standard case folding rules.
29uint32_t caseFoldingDjbHash(StringRef Buffer, uint32_t H = 5381);
30} // namespace llvm
31
32#endif // LLVM_SUPPORT_DJB_H
#define H(x, y, z)
Definition: MD5.cpp:57
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:50
iterator_range< const unsigned char * > bytes() const
Definition: StringRef.h:121
@ C
The default llvm calling convention, compatible with C.
Definition: CallingConv.h:34
This is an optimization pass for GlobalISel generic memory operations.
Definition: AddressRanges.h:18
uint32_t caseFoldingDjbHash(StringRef Buffer, uint32_t H=5381)
Computes the Bernstein hash after folding the input according to the Dwarf 5 standard case folding ru...
Definition: DJB.cpp:72
uint32_t djbHash(StringRef Buffer, uint32_t H=5381)
The Bernstein hash function used by the DWARF accelerator tables.
Definition: DJB.h:21