mirror of
https://github.com/LuaJIT/LuaJIT.git
synced 2025-02-07 23:24:09 +00:00
108 lines
3.2 KiB
C
108 lines
3.2 KiB
C
/*
|
|
** Math helper functions for assembler VM.
|
|
** Copyright (C) 2005-2022 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 ---------------------------------------------------- */
|
|
|
|
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_floor(x/y)*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 : (uint32_t)a;
|
|
ub = b < 0 ? (uint32_t)-b : (uint32_t)b;
|
|
y = ua % ub;
|
|
if (y != 0 && (a^b) < 0) y = y - ub;
|
|
if (((int32_t)y^b) < 0) y = (uint32_t)-(int32_t)y;
|
|
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
|