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annotate lib/Support/APSInt.cpp @ 128:c347d3398279 default tip

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fix
author mir3636
date Wed, 06 Dec 2017 14:37:17 +0900
parents 1172e4bd9c6f
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1 //===-- llvm/ADT/APSInt.cpp - Arbitrary Precision Signed Int ---*- 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 implements the APSInt class, which is a simple class that
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11 // represents an arbitrary sized integer that knows its signedness.
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12 //
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13 //===----------------------------------------------------------------------===//
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14
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15 #include "llvm/ADT/APSInt.h"
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16 #include "llvm/ADT/FoldingSet.h"
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17 #include "llvm/ADT/StringRef.h"
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18
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19 using namespace llvm;
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21 APSInt::APSInt(StringRef Str) {
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22 assert(!Str.empty() && "Invalid string length");
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23
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24 // (Over-)estimate the required number of bits.
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25 unsigned NumBits = ((Str.size() * 64) / 19) + 2;
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26 APInt Tmp(NumBits, Str, /*Radix=*/10);
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27 if (Str[0] == '-') {
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28 unsigned MinBits = Tmp.getMinSignedBits();
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29 if (MinBits > 0 && MinBits < NumBits)
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30 Tmp = Tmp.trunc(MinBits);
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31 *this = APSInt(Tmp, /*IsUnsigned=*/false);
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32 return;
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33 }
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34 unsigned ActiveBits = Tmp.getActiveBits();
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35 if (ActiveBits > 0 && ActiveBits < NumBits)
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36 Tmp = Tmp.trunc(ActiveBits);
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37 *this = APSInt(Tmp, /*IsUnsigned=*/true);
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38 }
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39
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40 void APSInt::Profile(FoldingSetNodeID& ID) const {
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41 ID.AddInteger((unsigned) (IsUnsigned ? 1 : 0));
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42 APInt::Profile(ID);
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43 }