mirror of https://github.com/odrling/Aegisub
141 lines
3.1 KiB
C
141 lines
3.1 KiB
C
/*
|
|
** Math helper functions for assembler VM.
|
|
** Copyright (C) 2005-2017 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"
|
|
|
|
/* -- Helper functions for generated machine code ------------------------- */
|
|
|
|
#if LJ_TARGET_X86ORX64
|
|
/* Wrapper functions to avoid linker issues on OSX. */
|
|
LJ_FUNCA double lj_vm_sinh(double x) { return sinh(x); }
|
|
LJ_FUNCA double lj_vm_cosh(double x) { return cosh(x); }
|
|
LJ_FUNCA double lj_vm_tanh(double x) { return tanh(x); }
|
|
#endif
|
|
|
|
#if !LJ_TARGET_X86ORX64
|
|
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_ATAN2 - IR_ADD: return atan2(x, y); break;
|
|
case IR_LDEXP - IR_ADD: return ldexp(x, (int)y); break;
|
|
case IR_MIN - IR_ADD: return x > y ? y : x; break;
|
|
case IR_MAX - IR_ADD: return x < y ? y : x; break;
|
|
#endif
|
|
default: return x;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#if LJ_HASJIT
|
|
|
|
#ifdef LUAJIT_NO_LOG2
|
|
double lj_vm_log2(double a)
|
|
{
|
|
return log(a) * 1.4426950408889634074;
|
|
}
|
|
#endif
|
|
|
|
#ifdef LUAJIT_NO_EXP2
|
|
double lj_vm_exp2(double a)
|
|
{
|
|
return exp(a * 0.6931471805599453);
|
|
}
|
|
#endif
|
|
|
|
#if !(LJ_TARGET_ARM || LJ_TARGET_PPC)
|
|
int32_t LJ_FASTCALL lj_vm_modi(int32_t a, int32_t b)
|
|
{
|
|
uint32_t y, ua, ub;
|
|
lua_assert(b != 0); /* This must be checked before using this function. */
|
|
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_TARGET_X86ORX64
|
|
/* Unsigned x^k. */
|
|
static double lj_vm_powui(double x, uint32_t k)
|
|
{
|
|
double y;
|
|
lua_assert(k != 0);
|
|
for (; (k & 1) == 0; k >>= 1) x *= x;
|
|
y = x;
|
|
if ((k >>= 1) != 0) {
|
|
for (;;) {
|
|
x *= x;
|
|
if (k == 1) break;
|
|
if (k & 1) y *= x;
|
|
k >>= 1;
|
|
}
|
|
y *= x;
|
|
}
|
|
return y;
|
|
}
|
|
|
|
/* Signed x^k. */
|
|
double lj_vm_powi(double x, int32_t k)
|
|
{
|
|
if (k > 1)
|
|
return lj_vm_powui(x, (uint32_t)k);
|
|
else if (k == 1)
|
|
return x;
|
|
else if (k == 0)
|
|
return 1.0;
|
|
else
|
|
return 1.0 / lj_vm_powui(x, (uint32_t)-k);
|
|
}
|
|
|
|
/* 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_EXP: return exp(x);
|
|
case IRFPM_EXP2: return lj_vm_exp2(x);
|
|
case IRFPM_LOG: return log(x);
|
|
case IRFPM_LOG2: return lj_vm_log2(x);
|
|
case IRFPM_LOG10: return log10(x);
|
|
case IRFPM_SIN: return sin(x);
|
|
case IRFPM_COS: return cos(x);
|
|
case IRFPM_TAN: return tan(x);
|
|
default: lua_assert(0);
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#if LJ_HASFFI
|
|
int lj_vm_errno(void)
|
|
{
|
|
return errno;
|
|
}
|
|
#endif
|
|
|
|
#endif
|