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https://github.com/c64scene-ar/llvm-6502.git
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507329912a
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150897 91177308-0d34-0410-b5e6-96231b3b80d8
47 lines
1.1 KiB
C++
47 lines
1.1 KiB
C++
//===-- llvm/ADT/Hashing.cpp - Utilities for hashing ------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/Hashing.h"
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namespace llvm {
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// Add a possibly unaligned sequence of bytes.
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void GeneralHash::addUnaligned(const uint8_t *I, const uint8_t *E) {
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ptrdiff_t Length = E - I;
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if ((uintptr_t(I) & 3) == 0) {
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while (Length > 3) {
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mix(*reinterpret_cast<const uint32_t *>(I));
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I += 4;
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Length -= 4;
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}
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} else {
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while (Length > 3) {
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mix(
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uint32_t(I[0]) +
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(uint32_t(I[1]) << 8) +
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(uint32_t(I[2]) << 16) +
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(uint32_t(I[3]) << 24));
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I += 4;
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Length -= 4;
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}
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}
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if (Length & 3) {
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uint32_t Data = 0;
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switch (Length & 3) {
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case 3: Data |= uint32_t(I[2]) << 16; // fall through
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case 2: Data |= uint32_t(I[1]) << 8; // fall through
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case 1: Data |= uint32_t(I[0]); break;
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}
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mix(Data);
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}
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}
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}
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