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annotate lib/Target/NVPTX/NVPTXutil.cpp @ 33:e4204d083e25

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LLVM 3.5
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 14:32:10 +0900
parents 95c75e76d11b
children
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1 //===-- NVPTXutil.cpp - Functions exported to CodeGen --*- 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 the functions that can be used in CodeGen.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #include "NVPTXutil.h"
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15 #include "NVPTX.h"
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16
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17 using namespace llvm;
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18
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19 namespace llvm {
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20
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21 bool isParamLoad(const MachineInstr *MI) {
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22 if ((MI->getOpcode() != NVPTX::LD_i32_avar) &&
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23 (MI->getOpcode() != NVPTX::LD_i64_avar))
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24 return false;
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25 if (MI->getOperand(2).isImm() == false)
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26 return false;
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27 if (MI->getOperand(2).getImm() != NVPTX::PTXLdStInstCode::PARAM)
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28 return false;
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29 return true;
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30 }
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31
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32 #define DATA_MASK 0x7f
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33 #define DIGIT_WIDTH 7
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34 #define MORE_BYTES 0x80
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35
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36 static int encode_leb128(uint64_t val, int *nbytes, char *space, int splen) {
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37 char *a;
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38 char *end = space + splen;
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39
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40 a = space;
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41 do {
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42 unsigned char uc;
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43
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44 if (a >= end)
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45 return 1;
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46 uc = val & DATA_MASK;
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47 val >>= DIGIT_WIDTH;
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48 if (val != 0)
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49 uc |= MORE_BYTES;
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50 *a = uc;
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51 a++;
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52 } while (val);
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53 *nbytes = a - space;
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54 return 0;
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55 }
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56
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57 #undef DATA_MASK
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58 #undef DIGIT_WIDTH
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59 #undef MORE_BYTES
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60
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61 uint64_t encode_leb128(const char *str) {
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62 union {
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63 uint64_t x;
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64 char a[8];
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65 } temp64;
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66
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67 temp64.x = 0;
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68
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69 for (unsigned i = 0, e = strlen(str); i != e; ++i)
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70 temp64.a[i] = str[e - 1 - i];
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71
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72 char encoded[16];
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73 int nbytes;
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74
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75 int retval = encode_leb128(temp64.x, &nbytes, encoded, 16);
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76
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77 (void) retval;
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78 assert(retval == 0 && "Encoding to leb128 failed");
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79
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80 assert(nbytes <= 8 &&
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81 "Cannot support register names with leb128 encoding > 8 bytes");
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82
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83 temp64.x = 0;
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84 for (int i = 0; i < nbytes; ++i)
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85 temp64.a[i] = encoded[i];
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86
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87 return temp64.x;
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88 }
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89
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90 } // end namespace llvm