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annotate third_party/luajit/src/lj_vmmath.c @ 279:b3b547563ec7

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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>
date Mon, 17 Aug 2026 22:22:36 -0700
parents 94705b5986b3
children
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178
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1 /*
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2 ** Math helper functions for assembler VM.
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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 #define lj_vmmath_c
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7 #define LUA_CORE
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8
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9 #include <errno.h>
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10 #include <math.h>
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11
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12 #include "lj_obj.h"
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13 #include "lj_ir.h"
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14 #include "lj_vm.h"
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15
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16 /* -- Wrapper functions --------------------------------------------------- */
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17
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18 #if LJ_TARGET_X86 && __ELF__ && __PIC__
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19 /* Wrapper functions to deal with the ELF/x86 PIC disaster. */
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20 LJ_FUNCA double lj_wrap_log(double x) { return log(x); }
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21 LJ_FUNCA double lj_wrap_log10(double x) { return log10(x); }
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22 LJ_FUNCA double lj_wrap_exp(double x) { return exp(x); }
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23 LJ_FUNCA double lj_wrap_sin(double x) { return sin(x); }
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24 LJ_FUNCA double lj_wrap_cos(double x) { return cos(x); }
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25 LJ_FUNCA double lj_wrap_tan(double x) { return tan(x); }
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26 LJ_FUNCA double lj_wrap_asin(double x) { return asin(x); }
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27 LJ_FUNCA double lj_wrap_acos(double x) { return acos(x); }
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28 LJ_FUNCA double lj_wrap_atan(double x) { return atan(x); }
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29 LJ_FUNCA double lj_wrap_sinh(double x) { return sinh(x); }
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30 LJ_FUNCA double lj_wrap_cosh(double x) { return cosh(x); }
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31 LJ_FUNCA double lj_wrap_tanh(double x) { return tanh(x); }
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32 LJ_FUNCA double lj_wrap_atan2(double x, double y) { return atan2(x, y); }
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33 LJ_FUNCA double lj_wrap_pow(double x, double y) { return pow(x, y); }
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34 LJ_FUNCA double lj_wrap_fmod(double x, double y) { return fmod(x, y); }
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35 #endif
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36
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37 /* -- Helper functions ---------------------------------------------------- */
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38
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39 /* Required to prevent the C compiler from applying FMA optimizations.
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40 **
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41 ** Yes, there's -ffp-contract and the FP_CONTRACT pragma ... in theory.
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42 ** But the current state of C compilers is a mess in this regard.
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43 ** Also, this function is not performance sensitive at all.
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44 */
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45 LJ_NOINLINE static double lj_vm_floormul(double x, double y)
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46 {
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47 return lj_vm_floor(x / y) * y;
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48 }
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49
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50 double lj_vm_foldarith(double x, double y, int op)
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51 {
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52 switch (op) {
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53 case IR_ADD - IR_ADD: return x+y; break;
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54 case IR_SUB - IR_ADD: return x-y; break;
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55 case IR_MUL - IR_ADD: return x*y; break;
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56 case IR_DIV - IR_ADD: return x/y; break;
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57 case IR_MOD - IR_ADD: return x-lj_vm_floormul(x, y); break;
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58 case IR_POW - IR_ADD: return pow(x, y); break;
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59 case IR_NEG - IR_ADD: return -x; break;
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60 case IR_ABS - IR_ADD: return fabs(x); break;
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61 #if LJ_HASJIT
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62 case IR_LDEXP - IR_ADD: return ldexp(x, (int)y); break;
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63 case IR_MIN - IR_ADD: return x < y ? x : y; break;
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64 case IR_MAX - IR_ADD: return x > y ? x : y; break;
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65 #endif
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66 default: return x;
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67 }
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68 }
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69
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70 /* -- Helper functions for generated machine code ------------------------- */
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71
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72 #if (LJ_HASJIT && !(LJ_TARGET_ARM || LJ_TARGET_ARM64 || LJ_TARGET_PPC)) || LJ_TARGET_MIPS
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73 int32_t LJ_FASTCALL lj_vm_modi(int32_t a, int32_t b)
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74 {
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75 uint32_t y, ua, ub;
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76 /* This must be checked before using this function. */
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77 lj_assertX(b != 0, "modulo with zero divisor");
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78 ua = a < 0 ? ~(uint32_t)a+1u : (uint32_t)a;
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79 ub = b < 0 ? ~(uint32_t)b+1u : (uint32_t)b;
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80 y = ua % ub;
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81 if (y != 0 && (a^b) < 0) y = y - ub;
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82 if (((int32_t)y^b) < 0) y = ~y+1u;
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83 return (int32_t)y;
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84 }
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85 #endif
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86
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87 #if LJ_HASJIT
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88
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89 #ifdef LUAJIT_NO_LOG2
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90 double lj_vm_log2(double a)
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91 {
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92 return log(a) * 1.4426950408889634074;
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93 }
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94 #endif
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95
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96 /* Computes fpm(x) for extended math functions. */
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97 double lj_vm_foldfpm(double x, int fpm)
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98 {
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99 switch (fpm) {
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100 case IRFPM_FLOOR: return lj_vm_floor(x);
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101 case IRFPM_CEIL: return lj_vm_ceil(x);
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102 case IRFPM_TRUNC: return lj_vm_trunc(x);
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103 case IRFPM_SQRT: return sqrt(x);
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104 case IRFPM_LOG: return log(x);
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105 case IRFPM_LOG2: return lj_vm_log2(x);
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106 default: lj_assertX(0, "bad fpm %d", fpm);
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107 }
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108 return 0;
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109 }
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110
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111 #if LJ_HASFFI
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112 int lj_vm_errno(void)
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113 {
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114 return errno;
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115 }
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116 #endif
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117
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118 #endif