【新增】添加原版luajit版本v2.1代码

thirdPart/luajit/src/lj_vmmath.c

@@ -0,0 +1,118 @@
+/*
+** Math helper functions for assembler VM.
+** Copyright (C) 2005-2023 Mike Pall. See Copyright Notice in luajit.h
+*/
+
+#define lj_vmmath_c
+#define LUA_CORE
+
+#include <errno.h>
+#include <math.h>
+
+#include "lj_obj.h"
+#include "lj_ir.h"
+#include "lj_vm.h"
+
+/* -- Wrapper functions --------------------------------------------------- */
+
+#if LJ_TARGET_X86 && __ELF__ && __PIC__
+/* Wrapper functions to deal with the ELF/x86 PIC disaster. */
+LJ_FUNCA double lj_wrap_log(double x) { return log(x); }
+LJ_FUNCA double lj_wrap_log10(double x) { return log10(x); }
+LJ_FUNCA double lj_wrap_exp(double x) { return exp(x); }
+LJ_FUNCA double lj_wrap_sin(double x) { return sin(x); }
+LJ_FUNCA double lj_wrap_cos(double x) { return cos(x); }
+LJ_FUNCA double lj_wrap_tan(double x) { return tan(x); }
+LJ_FUNCA double lj_wrap_asin(double x) { return asin(x); }
+LJ_FUNCA double lj_wrap_acos(double x) { return acos(x); }
+LJ_FUNCA double lj_wrap_atan(double x) { return atan(x); }
+LJ_FUNCA double lj_wrap_sinh(double x) { return sinh(x); }
+LJ_FUNCA double lj_wrap_cosh(double x) { return cosh(x); }
+LJ_FUNCA double lj_wrap_tanh(double x) { return tanh(x); }
+LJ_FUNCA double lj_wrap_atan2(double x, double y) { return atan2(x, y); }
+LJ_FUNCA double lj_wrap_pow(double x, double y) { return pow(x, y); }
+LJ_FUNCA double lj_wrap_fmod(double x, double y) { return fmod(x, y); }
+#endif
+
+/* -- Helper functions ---------------------------------------------------- */
+
+/* Required to prevent the C compiler from applying FMA optimizations.
+**
+** Yes, there's -ffp-contract and the FP_CONTRACT pragma ... in theory.
+** But the current state of C compilers is a mess in this regard.
+** Also, this function is not performance sensitive at all.
+*/
+LJ_NOINLINE static double lj_vm_floormul(double x, double y)
+{
+  return lj_vm_floor(x / y) * y;
+}
+
+double lj_vm_foldarith(double x, double y, int op)
+{
+  switch (op) {
+  case IR_ADD - IR_ADD: return x+y; break;
+  case IR_SUB - IR_ADD: return x-y; break;
+  case IR_MUL - IR_ADD: return x*y; break;
+  case IR_DIV - IR_ADD: return x/y; break;
+  case IR_MOD - IR_ADD: return x-lj_vm_floormul(x, y); break;
+  case IR_POW - IR_ADD: return pow(x, y); break;
+  case IR_NEG - IR_ADD: return -x; break;
+  case IR_ABS - IR_ADD: return fabs(x); break;
+#if LJ_HASJIT
+  case IR_LDEXP - IR_ADD: return ldexp(x, (int)y); break;
+  case IR_MIN - IR_ADD: return x < y ? x : y; break;
+  case IR_MAX - IR_ADD: return x > y ? x : y; break;
+#endif
+  default: return x;
+  }
+}
+
+/* -- Helper functions for generated machine code ------------------------- */
+
+#if (LJ_HASJIT && !(LJ_TARGET_ARM || LJ_TARGET_ARM64 || LJ_TARGET_PPC)) || LJ_TARGET_MIPS
+int32_t LJ_FASTCALL lj_vm_modi(int32_t a, int32_t b)
+{
+  uint32_t y, ua, ub;
+  /* This must be checked before using this function. */
+  lj_assertX(b != 0, "modulo with zero divisor");
+  ua = a < 0 ? ~(uint32_t)a+1u : (uint32_t)a;
+  ub = b < 0 ? ~(uint32_t)b+1u : (uint32_t)b;
+  y = ua % ub;
+  if (y != 0 && (a^b) < 0) y = y - ub;
+  if (((int32_t)y^b) < 0) y = ~y+1u;
+  return (int32_t)y;
+}
+#endif
+
+#if LJ_HASJIT
+
+#ifdef LUAJIT_NO_LOG2
+double lj_vm_log2(double a)
+{
+  return log(a) * 1.4426950408889634074;
+}
+#endif
+
+/* Computes fpm(x) for extended math functions. */
+double lj_vm_foldfpm(double x, int fpm)
+{
+  switch (fpm) {
+  case IRFPM_FLOOR: return lj_vm_floor(x);
+  case IRFPM_CEIL: return lj_vm_ceil(x);
+  case IRFPM_TRUNC: return lj_vm_trunc(x);
+  case IRFPM_SQRT: return sqrt(x);
+  case IRFPM_LOG: return log(x);
+  case IRFPM_LOG2: return lj_vm_log2(x);
+  default: lj_assertX(0, "bad fpm %d", fpm);
+  }
+  return 0;
+}
+
+#if LJ_HASFFI
+int lj_vm_errno(void)
+{
+  return errno;
+}
+#endif
+
+#endif