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/*
** 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 ---------------------------------------------------- */
/* 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 : (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
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