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/* Copyright 2021 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef __CROS_EC_FPU_H
#define __CROS_EC_FPU_H
/*
* These functions are available in newlib but we are are using Zephyr's
* minimal library at present.
*
* This file is not called math.h to avoid a conflict with the toolchain's
* built-in version.
*
* This code is taken from core/cortex-m/include/fpu.h
*/
#ifdef CONFIG_PLATFORM_EC_FPU
/* Implementation for Cortex-M */
#ifdef CONFIG_CPU_CORTEX_M
static inline float sqrtf(float v)
{
float root;
/* Use the CPU instruction */
__asm__ volatile(
"fsqrts %0, %1"
: "=w" (root)
: "w" (v)
);
return root;
}
static inline float fabsf(float v)
{
float root;
/* Use the CPU instruction */
__asm__ volatile(
"fabss %0, %1"
: "=w" (root)
: "w" (v)
);
return root;
}
#elif CONFIG_RISCV
static inline float sqrtf(float v)
{
float root;
__asm__("fsqrt.s %0, %1" : "=f"(root) : "f"(v));
return root;
}
static inline float fabsf(float v)
{
float abs;
__asm__("fabs.s %0, %1" : "=f"(abs) : "f"(v));
return abs;
}
#else
#error "Unsupported core: please add an implementation"
#endif
#endif /* CONFIG_PLATFORM_EC_FPU */
#endif /* __CROS_EC_MATH_H */
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