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/* Copyright 2016 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* Math utility functions for minute-IA */
#ifndef __CROS_EC_FPU_H
#define __CROS_EC_FPU_H
#include "config.h"
#ifdef CONFIG_FPU
#define M_PI 3.14159265358979323846
#define M_PI_2 1.57079632679489661923
static inline float sqrtf(float v)
{
float root;
/* root = fsqart (v); */
asm volatile(
"fsqrt"
: "=t" (root)
: "0" (v)
);
return root;
}
/* Absolute value of V. */
static inline float fabsf(float v)
{
float root;
/* root = fabs (v); */
asm volatile(
"fabs"
: "=t" (root)
: "0" (v)
);
return root;
}
/**
* Natural logarithm of V.
*
* @return ln(v)
*/
static inline float logf(float v)
{
float res;
asm volatile(
"fldln2\n"
"fxch\n"
"fyl2x\n"
: "=t" (res)
: "0" (v));
return res;
}
/**
* Exponential function of V.
*
* @return e**v
*/
static inline float expf(float v)
{
float res;
asm volatile(
"fldl2e\n"
"fmulp\n"
"fld %%st(0)\n"
"frndint\n"
"fsubr %%st(0),%%st(1)\n" /* bug-binutils/19054 */
"fxch %%st(1)\n"
"f2xm1\n"
"fld1\n"
"faddp\n"
"fscale\n"
"fstp %%st(1)\n"
: "=t" (res)
: "0" (v));
return res;
}
/**
* X to the Y power.
*
* @return x**y
*/
static inline float powf(float x, float y)
{
float res;
asm volatile(
"fyl2x\n"
"fld %%st(0)\n"
"frndint\n"
"fsub %%st,%%st(1)\n"
"fxch\n"
"fchs\n"
"f2xm1\n"
"fld1\n"
"faddp\n"
"fxch\n"
"fld1\n"
"fscale\n"
"fstp %%st(1)\n"
"fmulp\n"
: "=t" (res)
: "0" (x), "u" (y)
: "st(1)");
return res;
}
/* Smallest integral value not less than V. */
static inline float ceilf(float v)
{
float res;
unsigned short control_word, control_word_tmp;
asm volatile("fnstcw %0" : "=m" (control_word));
/* Set Rounding Mode to 10B, round up toward +infinity */
control_word_tmp = (control_word | 0x0800) & 0xfbff;
asm volatile(
"fld %3\n"
"fldcw %1\n"
"frndint\n"
"fldcw %2"
: "=t" (res)
: "m" (control_word_tmp), "m"(control_word), "m" (v));
return res;
}
/* Arc tangent of Y/X. */
static inline float atan2f(float y, float x)
{
float res;
asm volatile("fpatan" : "=t" (res) : "0" (x), "u" (y) : "st(1)");
return res;
}
/* Arc tangent of V. */
static inline float atanf(float v)
{
float res;
asm volatile(
"fld1\n"
"fpatan\n"
: "=t" (res)
: "0" (v));
return res;
}
/* Sine of V. */
static inline float sinf(float v)
{
float res;
asm volatile("fsin" : "=t" (res) : "0" (v));
return res;
}
/* Cosine of V. */
static inline float cosf(float v)
{
float res;
asm volatile("fcos" : "=t" (res) : "0" (v));
return res;
}
/* Arc cosine of V. */
static inline float acosf(float v)
{
return atan2f(sqrtf(1.0 - v * v), v);
}
#define COND_FP_NAN 0x0100
#define COND_FP_SIGNBIT 0x0200
#define COND_FP_NORMAL 0x0400
#define COND_FP_ZERO 0x4000
#define COND_FP_INFINITE (COND_FP_NAN | COND_FP_NORMAL)
/* Check if V is NaN (not-a-number). */
static inline int __isnanf(float v)
{
uint16_t stat;
asm volatile(
"fxam\n"
"fnstsw %0\n"
: "=r" (stat)
: "0" (v));
return (stat & (COND_FP_NAN | COND_FP_NORMAL | COND_FP_ZERO))
== COND_FP_NAN;
}
/**
* Check if V is infinite.
*
* @return 0 if V is finite or NaN.
* @return +1 if V is +infinite.
* @return -1 if V is -infinite.
*/
static inline int __isinff(float v)
{
uint16_t stat;
asm volatile(
"fxam\n"
"fnstsw %0\n"
: "=r" (stat)
: "v" (v));
if ((stat & (COND_FP_NAN | COND_FP_NORMAL | COND_FP_ZERO)) ==
COND_FP_INFINITE) {
/* Infinite number, check sign */
return stat & COND_FP_SIGNBIT ? -1 : 1;
}
/* Finite or NaN */
return 0;
}
#endif /* CONFIG_FPU */
#endif /* __CROS_EC_FPU_H */
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