annotate lib/Support/JamCRC.cpp @ 117:facf19d07cd9

check EHStack on EmitCall (CbC goto)
author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Wed, 24 Aug 2016 20:10:41 +0900 (2016-08-24)
parents afa8332a0e37
children 1172e4bd9c6f
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1 //===-- JamCRC.cpp - Cyclic Redundancy Check --------------------*- C++ -*-===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file contains an implementation of JamCRC.
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11 //
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12 //===----------------------------------------------------------------------===//
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13 //
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14 // The implementation technique is the one mentioned in:
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15 // D. V. Sarwate. 1988. Computation of cyclic redundancy checks via table
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16 // look-up. Commun. ACM 31, 8 (August 1988)
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17 //
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18 //===----------------------------------------------------------------------===//
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19
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20 #include "llvm/Support/JamCRC.h"
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21
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22 using namespace llvm;
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23
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24 static const uint32_t CRCTable[256] = {
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89 };
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90
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91 void JamCRC::update(ArrayRef<char> Data) {
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92 for (char Byte : Data) {
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93 int TableIdx = (CRC ^ Byte) & 0xff;
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94 CRC = CRCTable[TableIdx] ^ (CRC >> 8);
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95 }
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96 }