108 lines
3.2 KiB
C
108 lines
3.2 KiB
C
/*
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** Math helper functions for assembler VM.
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** Copyright (C) 2005-2022 Mike Pall. See Copyright Notice in luajit.h
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*/
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#define lj_vmmath_c
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#define LUA_CORE
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#include <errno.h>
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#include <math.h>
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#include "lj_obj.h"
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#include "lj_ir.h"
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#include "lj_vm.h"
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/* -- Wrapper functions --------------------------------------------------- */
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#if LJ_TARGET_X86 && __ELF__ && __PIC__
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/* Wrapper functions to deal with the ELF/x86 PIC disaster. */
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LJ_FUNCA double lj_wrap_log(double x) { return log(x); }
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LJ_FUNCA double lj_wrap_log10(double x) { return log10(x); }
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LJ_FUNCA double lj_wrap_exp(double x) { return exp(x); }
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LJ_FUNCA double lj_wrap_sin(double x) { return sin(x); }
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LJ_FUNCA double lj_wrap_cos(double x) { return cos(x); }
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LJ_FUNCA double lj_wrap_tan(double x) { return tan(x); }
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LJ_FUNCA double lj_wrap_asin(double x) { return asin(x); }
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LJ_FUNCA double lj_wrap_acos(double x) { return acos(x); }
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LJ_FUNCA double lj_wrap_atan(double x) { return atan(x); }
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LJ_FUNCA double lj_wrap_sinh(double x) { return sinh(x); }
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LJ_FUNCA double lj_wrap_cosh(double x) { return cosh(x); }
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LJ_FUNCA double lj_wrap_tanh(double x) { return tanh(x); }
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LJ_FUNCA double lj_wrap_atan2(double x, double y) { return atan2(x, y); }
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LJ_FUNCA double lj_wrap_pow(double x, double y) { return pow(x, y); }
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LJ_FUNCA double lj_wrap_fmod(double x, double y) { return fmod(x, y); }
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#endif
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/* -- Helper functions ---------------------------------------------------- */
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double lj_vm_foldarith(double x, double y, int op)
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{
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switch (op) {
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case IR_ADD - IR_ADD: return x+y; break;
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case IR_SUB - IR_ADD: return x-y; break;
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case IR_MUL - IR_ADD: return x*y; break;
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case IR_DIV - IR_ADD: return x/y; break;
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case IR_MOD - IR_ADD: return x-lj_vm_floor(x/y)*y; break;
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case IR_POW - IR_ADD: return pow(x, y); break;
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case IR_NEG - IR_ADD: return -x; break;
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case IR_ABS - IR_ADD: return fabs(x); break;
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#if LJ_HASJIT
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case IR_LDEXP - IR_ADD: return ldexp(x, (int)y); break;
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case IR_MIN - IR_ADD: return x < y ? x : y; break;
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case IR_MAX - IR_ADD: return x > y ? x : y; break;
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#endif
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default: return x;
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}
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}
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/* -- Helper functions for generated machine code ------------------------- */
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#if (LJ_HASJIT && !(LJ_TARGET_ARM || LJ_TARGET_ARM64 || LJ_TARGET_PPC)) || LJ_TARGET_MIPS
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int32_t LJ_FASTCALL lj_vm_modi(int32_t a, int32_t b)
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{
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uint32_t y, ua, ub;
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/* This must be checked before using this function. */
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lj_assertX(b != 0, "modulo with zero divisor");
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ua = a < 0 ? (uint32_t)-a : (uint32_t)a;
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ub = b < 0 ? (uint32_t)-b : (uint32_t)b;
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y = ua % ub;
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if (y != 0 && (a^b) < 0) y = y - ub;
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if (((int32_t)y^b) < 0) y = (uint32_t)-(int32_t)y;
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return (int32_t)y;
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}
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#endif
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#if LJ_HASJIT
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#ifdef LUAJIT_NO_LOG2
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double lj_vm_log2(double a)
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{
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return log(a) * 1.4426950408889634074;
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}
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#endif
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/* Computes fpm(x) for extended math functions. */
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double lj_vm_foldfpm(double x, int fpm)
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{
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switch (fpm) {
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case IRFPM_FLOOR: return lj_vm_floor(x);
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case IRFPM_CEIL: return lj_vm_ceil(x);
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case IRFPM_TRUNC: return lj_vm_trunc(x);
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case IRFPM_SQRT: return sqrt(x);
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case IRFPM_LOG: return log(x);
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case IRFPM_LOG2: return lj_vm_log2(x);
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default: lj_assertX(0, "bad fpm %d", fpm);
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}
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return 0;
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}
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#if LJ_HASFFI
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int lj_vm_errno(void)
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{
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return errno;
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}
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#endif
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#endif
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