Mercurial
annotate third_party/luajit/src/lj_emit_mips.h @ 279:b3b547563ec7
Add Google connector service and agent wiki
Implement the C/Seobeo Google Drive and Gmail connector with encrypted OAuth storage, Zenbu authentication, browser testing, AI tool discovery, chunked HTTP decoding, and Bazel coverage. Consolidate repository guidance into progressive wiki documentation and enforce arena-first allocation for new first-party C code.
Co-authored-by: Copilot <[email protected]>
Copilot-Session: 84c338fd-0939-4bb3-b7f3-1062eb213e5d
| author | MrJuneJune <me@mrjunejune.com> |
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| date | Mon, 17 Aug 2026 22:22:36 -0700 |
| parents | 94705b5986b3 |
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| rev | line source |
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1 /* |
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2 ** MIPS instruction emitter. |
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3 ** Copyright (C) 2005-2023 Mike Pall. See Copyright Notice in luajit.h |
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4 */ |
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5 |
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6 #if LJ_64 |
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7 static intptr_t get_k64val(ASMState *as, IRRef ref) |
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8 { |
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9 IRIns *ir = IR(ref); |
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10 if (ir->o == IR_KINT64) { |
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11 return (intptr_t)ir_kint64(ir)->u64; |
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12 } else if (ir->o == IR_KGC) { |
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13 return (intptr_t)ir_kgc(ir); |
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14 } else if (ir->o == IR_KPTR || ir->o == IR_KKPTR) { |
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15 return (intptr_t)ir_kptr(ir); |
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16 } else if (LJ_SOFTFP && ir->o == IR_KNUM) { |
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17 return (intptr_t)ir_knum(ir)->u64; |
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18 } else { |
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19 lj_assertA(ir->o == IR_KINT || ir->o == IR_KNULL, |
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20 "bad 64 bit const IR op %d", ir->o); |
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21 return ir->i; /* Sign-extended. */ |
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22 } |
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23 } |
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24 #endif |
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25 |
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26 #if LJ_64 |
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27 #define get_kval(as, ref) get_k64val(as, ref) |
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28 #else |
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29 #define get_kval(as, ref) (IR((ref))->i) |
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30 #endif |
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31 |
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32 /* -- Emit basic instructions --------------------------------------------- */ |
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33 |
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34 static void emit_dst(ASMState *as, MIPSIns mi, Reg rd, Reg rs, Reg rt) |
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35 { |
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36 *--as->mcp = mi | MIPSF_D(rd) | MIPSF_S(rs) | MIPSF_T(rt); |
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37 } |
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38 |
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39 static void emit_dta(ASMState *as, MIPSIns mi, Reg rd, Reg rt, uint32_t a) |
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40 { |
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41 *--as->mcp = mi | MIPSF_D(rd) | MIPSF_T(rt) | MIPSF_A(a); |
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42 } |
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43 |
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44 #define emit_ds(as, mi, rd, rs) emit_dst(as, (mi), (rd), (rs), 0) |
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45 #define emit_tg(as, mi, rt, rg) emit_dst(as, (mi), (rg)&31, 0, (rt)) |
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46 |
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47 static void emit_tsi(ASMState *as, MIPSIns mi, Reg rt, Reg rs, int32_t i) |
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48 { |
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49 *--as->mcp = mi | MIPSF_T(rt) | MIPSF_S(rs) | (i & 0xffff); |
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50 } |
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51 |
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52 #define emit_ti(as, mi, rt, i) emit_tsi(as, (mi), (rt), 0, (i)) |
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53 #define emit_hsi(as, mi, rh, rs, i) emit_tsi(as, (mi), (rh) & 31, (rs), (i)) |
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54 |
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55 static void emit_fgh(ASMState *as, MIPSIns mi, Reg rf, Reg rg, Reg rh) |
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56 { |
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57 *--as->mcp = mi | MIPSF_F(rf&31) | MIPSF_G(rg&31) | MIPSF_H(rh&31); |
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58 } |
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59 |
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60 #define emit_fg(as, mi, rf, rg) emit_fgh(as, (mi), (rf), (rg), 0) |
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61 |
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62 static void emit_rotr(ASMState *as, Reg dest, Reg src, Reg tmp, uint32_t shift) |
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63 { |
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64 if (LJ_64 || (as->flags & JIT_F_MIPSXXR2)) { |
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65 emit_dta(as, MIPSI_ROTR, dest, src, shift); |
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66 } else { |
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67 emit_dst(as, MIPSI_OR, dest, dest, tmp); |
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68 emit_dta(as, MIPSI_SLL, dest, src, (-shift)&31); |
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69 emit_dta(as, MIPSI_SRL, tmp, src, shift); |
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70 } |
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71 } |
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72 |
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73 #if LJ_64 || LJ_HASBUFFER |
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74 static void emit_tsml(ASMState *as, MIPSIns mi, Reg rt, Reg rs, uint32_t msb, |
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75 uint32_t lsb) |
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76 { |
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77 *--as->mcp = mi | MIPSF_T(rt) | MIPSF_S(rs) | MIPSF_M(msb) | MIPSF_L(lsb); |
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78 } |
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79 #endif |
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80 |
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81 /* -- Emit loads/stores --------------------------------------------------- */ |
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82 |
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83 /* Prefer rematerialization of BASE/L from global_State over spills. */ |
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84 #define emit_canremat(ref) ((ref) <= REF_BASE) |
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85 |
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86 /* Try to find a one step delta relative to another constant. */ |
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87 static int emit_kdelta1(ASMState *as, Reg rd, intptr_t i) |
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88 { |
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89 RegSet work = ~as->freeset & RSET_GPR; |
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90 while (work) { |
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91 Reg r = rset_picktop(work); |
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92 IRRef ref = regcost_ref(as->cost[r]); |
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93 lj_assertA(r != rd, "dest reg %d not free", rd); |
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94 if (ref < ASMREF_L) { |
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95 intptr_t delta = (intptr_t)((uintptr_t)i - |
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96 (uintptr_t)(ra_iskref(ref) ? ra_krefk(as, ref) : get_kval(as, ref))); |
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97 if (checki16(delta)) { |
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98 emit_tsi(as, MIPSI_AADDIU, rd, r, delta); |
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99 return 1; |
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100 } |
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101 } |
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102 rset_clear(work, r); |
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103 } |
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104 return 0; /* Failed. */ |
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105 } |
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106 |
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107 /* Load a 32 bit constant into a GPR. */ |
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108 static void emit_loadi(ASMState *as, Reg r, int32_t i) |
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109 { |
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110 if (checki16(i)) { |
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111 emit_ti(as, MIPSI_LI, r, i); |
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112 } else { |
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113 if ((i & 0xffff)) { |
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114 intptr_t jgl = (intptr_t)(void *)J2G(as->J); |
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115 if ((uintptr_t)(i-jgl) < 65536) { |
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116 emit_tsi(as, MIPSI_ADDIU, r, RID_JGL, i-jgl-32768); |
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117 return; |
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118 } else if (emit_kdelta1(as, r, i)) { |
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119 return; |
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120 } else if ((i >> 16) == 0) { |
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121 emit_tsi(as, MIPSI_ORI, r, RID_ZERO, i); |
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122 return; |
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123 } |
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124 emit_tsi(as, MIPSI_ORI, r, r, i); |
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125 } |
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126 emit_ti(as, MIPSI_LUI, r, (i >> 16)); |
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127 } |
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128 } |
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129 |
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130 #if LJ_64 |
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131 /* Load a 64 bit constant into a GPR. */ |
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132 static void emit_loadu64(ASMState *as, Reg r, uint64_t u64) |
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133 { |
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134 if (checki32((int64_t)u64)) { |
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135 emit_loadi(as, r, (int32_t)u64); |
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136 } else { |
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137 uint64_t delta = u64 - (uint64_t)(void *)J2G(as->J); |
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138 if (delta < 65536) { |
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139 emit_tsi(as, MIPSI_DADDIU, r, RID_JGL, (int32_t)(delta-32768)); |
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140 } else if (emit_kdelta1(as, r, (intptr_t)u64)) { |
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141 return; |
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142 } else { |
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143 /* TODO MIPSR6: Use DAHI & DATI. Caveat: sign-extension. */ |
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144 if ((u64 & 0xffff)) { |
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145 emit_tsi(as, MIPSI_ORI, r, r, u64 & 0xffff); |
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146 } |
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147 if (((u64 >> 16) & 0xffff)) { |
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148 emit_dta(as, MIPSI_DSLL, r, r, 16); |
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149 emit_tsi(as, MIPSI_ORI, r, r, (u64 >> 16) & 0xffff); |
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150 emit_dta(as, MIPSI_DSLL, r, r, 16); |
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151 } else { |
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152 emit_dta(as, MIPSI_DSLL32, r, r, 0); |
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153 } |
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154 emit_loadi(as, r, (int32_t)(u64 >> 32)); |
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155 } |
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156 /* TODO: There are probably more optimization opportunities. */ |
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157 } |
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158 } |
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159 |
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160 #define emit_loada(as, r, addr) emit_loadu64(as, (r), u64ptr((addr))) |
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161 #else |
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162 #define emit_loada(as, r, addr) emit_loadi(as, (r), i32ptr((addr))) |
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163 #endif |
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164 |
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165 static Reg ra_allock(ASMState *as, intptr_t k, RegSet allow); |
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166 static void ra_allockreg(ASMState *as, intptr_t k, Reg r); |
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167 |
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168 /* Get/set from constant pointer. */ |
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169 static void emit_lsptr(ASMState *as, MIPSIns mi, Reg r, void *p, RegSet allow) |
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170 { |
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171 intptr_t jgl = (intptr_t)(J2G(as->J)); |
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172 intptr_t i = (intptr_t)(p); |
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173 Reg base; |
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174 if ((uint32_t)(i-jgl) < 65536) { |
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175 i = i-jgl-32768; |
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176 base = RID_JGL; |
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177 } else { |
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178 base = ra_allock(as, i-(int16_t)i, allow); |
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179 } |
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180 emit_tsi(as, mi, r, base, i); |
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181 } |
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182 |
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183 #if LJ_64 |
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184 static void emit_loadk64(ASMState *as, Reg r, IRIns *ir) |
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185 { |
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186 const uint64_t *k = &ir_k64(ir)->u64; |
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187 Reg r64 = r; |
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188 if (rset_test(RSET_FPR, r)) { |
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189 r64 = RID_TMP; |
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190 emit_tg(as, MIPSI_DMTC1, r64, r); |
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191 } |
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192 if ((uint32_t)((intptr_t)k-(intptr_t)J2G(as->J)) < 65536) |
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193 emit_lsptr(as, MIPSI_LD, r64, (void *)k, 0); |
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194 else |
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195 emit_loadu64(as, r64, *k); |
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196 } |
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197 #else |
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198 #define emit_loadk64(as, r, ir) \ |
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199 emit_lsptr(as, MIPSI_LDC1, ((r) & 31), (void *)&ir_knum((ir))->u64, RSET_GPR) |
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200 #endif |
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201 |
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202 /* Get/set global_State fields. */ |
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203 static void emit_lsglptr(ASMState *as, MIPSIns mi, Reg r, int32_t ofs) |
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204 { |
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205 emit_tsi(as, mi, r, RID_JGL, ofs-32768); |
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206 } |
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207 |
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208 #define emit_getgl(as, r, field) \ |
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209 emit_lsglptr(as, MIPSI_AL, (r), (int32_t)offsetof(global_State, field)) |
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210 #define emit_setgl(as, r, field) \ |
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211 emit_lsglptr(as, MIPSI_AS, (r), (int32_t)offsetof(global_State, field)) |
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212 |
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213 /* Trace number is determined from per-trace exit stubs. */ |
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214 #define emit_setvmstate(as, i) UNUSED(i) |
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215 |
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216 /* -- Emit control-flow instructions -------------------------------------- */ |
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217 |
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218 /* Label for internal jumps. */ |
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219 typedef MCode *MCLabel; |
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220 |
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221 /* Return label pointing to current PC. */ |
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222 #define emit_label(as) ((as)->mcp) |
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223 |
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224 static void emit_branch(ASMState *as, MIPSIns mi, Reg rs, Reg rt, MCode *target) |
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225 { |
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226 MCode *p = as->mcp; |
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227 ptrdiff_t delta = target - p; |
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228 lj_assertA(((delta + 0x8000) >> 16) == 0, "branch target out of range"); |
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229 *--p = mi | MIPSF_S(rs) | MIPSF_T(rt) | ((uint32_t)delta & 0xffffu); |
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230 as->mcp = p; |
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231 } |
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232 |
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233 static void emit_jmp(ASMState *as, MCode *target) |
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234 { |
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235 *--as->mcp = MIPSI_NOP; |
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236 emit_branch(as, MIPSI_B, RID_ZERO, RID_ZERO, (target)); |
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237 } |
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238 |
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239 static void emit_call(ASMState *as, void *target, int needcfa) |
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240 { |
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241 MCode *p = as->mcp; |
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242 #if LJ_TARGET_MIPSR6 |
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243 ptrdiff_t delta = (char *)target - (char *)p; |
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244 if ((((delta>>2) + 0x02000000) >> 26) == 0) { /* Try compact call first. */ |
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245 *--p = MIPSI_BALC | (((uintptr_t)delta >>2) & 0x03ffffffu); |
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246 as->mcp = p; |
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247 return; |
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248 } |
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249 #endif |
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250 *--p = MIPSI_NOP; /* Delay slot. */ |
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251 if ((((uintptr_t)target ^ (uintptr_t)p) >> 28) == 0) { |
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252 #if !LJ_TARGET_MIPSR6 |
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253 *--p = (((uintptr_t)target & 1) ? MIPSI_JALX : MIPSI_JAL) | |
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254 (((uintptr_t)target >>2) & 0x03ffffffu); |
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255 #else |
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256 *--p = MIPSI_JAL | (((uintptr_t)target >>2) & 0x03ffffffu); |
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257 #endif |
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258 } else { /* Target out of range: need indirect call. */ |
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259 *--p = MIPSI_JALR | MIPSF_S(RID_CFUNCADDR); |
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260 needcfa = 1; |
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261 } |
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262 as->mcp = p; |
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263 if (needcfa) ra_allockreg(as, (intptr_t)target, RID_CFUNCADDR); |
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264 } |
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265 |
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266 /* -- Emit generic operations --------------------------------------------- */ |
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267 |
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268 #define emit_move(as, dst, src) \ |
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269 emit_ds(as, MIPSI_MOVE, (dst), (src)) |
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270 |
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271 /* Generic move between two regs. */ |
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272 static void emit_movrr(ASMState *as, IRIns *ir, Reg dst, Reg src) |
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273 { |
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274 if (dst < RID_MAX_GPR) |
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275 emit_move(as, dst, src); |
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276 else |
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277 emit_fg(as, irt_isnum(ir->t) ? MIPSI_MOV_D : MIPSI_MOV_S, dst, src); |
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278 } |
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279 |
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280 /* Generic load of register with base and (small) offset address. */ |
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281 static void emit_loadofs(ASMState *as, IRIns *ir, Reg r, Reg base, int32_t ofs) |
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282 { |
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283 if (r < RID_MAX_GPR) |
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284 emit_tsi(as, irt_is64(ir->t) ? MIPSI_LD : MIPSI_LW, r, base, ofs); |
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285 else |
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286 emit_tsi(as, irt_isnum(ir->t) ? MIPSI_LDC1 : MIPSI_LWC1, |
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287 (r & 31), base, ofs); |
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288 } |
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289 |
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290 /* Generic store of register with base and (small) offset address. */ |
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291 static void emit_storeofs(ASMState *as, IRIns *ir, Reg r, Reg base, int32_t ofs) |
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292 { |
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293 if (r < RID_MAX_GPR) |
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294 emit_tsi(as, irt_is64(ir->t) ? MIPSI_SD : MIPSI_SW, r, base, ofs); |
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295 else |
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296 emit_tsi(as, irt_isnum(ir->t) ? MIPSI_SDC1 : MIPSI_SWC1, |
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297 (r&31), base, ofs); |
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298 } |
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299 |
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300 /* Add offset to pointer. */ |
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301 static void emit_addptr(ASMState *as, Reg r, int32_t ofs) |
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302 { |
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303 if (ofs) { |
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304 lj_assertA(checki16(ofs), "offset %d out of range", ofs); |
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305 emit_tsi(as, MIPSI_AADDIU, r, r, ofs); |
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306 } |
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307 } |
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308 |
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309 #define emit_spsub(as, ofs) emit_addptr(as, RID_SP, -(ofs)) |
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310 |