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//
// Copyright (c) 2017 The Khronos Group Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#ifndef _fpcontrol_h
#define _fpcontrol_h

// In order to get tests for correctly rounded operations (e.g. multiply) to
// work properly we need to be able to set the reference hardware to FTZ mode if
// the device hardware is running in that mode.  We have explored all other
// options short of writing correctly rounded operations in integer code, and
// have found this is the only way to correctly verify operation.
//
// Non-Apple implementations will need to provide their own implentation for
// these features.  If the reference hardware and device are both running in the
// same state (either FTZ or IEEE compliant modes) then these functions may be
// empty.  If the device is running in non-default rounding mode (e.g. round
// toward zero), then these functions should also set the reference device into
// that rounding mode.
#if defined(__APPLE__) || defined(_MSC_VER) || defined(__linux__)              \
    || defined(__MINGW32__)
typedef int FPU_mode_type;
#if defined(__i386__) || defined(__x86_64__) || defined(_MSC_VER)              \
    || defined(__MINGW32__)
#include <xmmintrin.h>
#elif defined(__PPC__)
#include <fpu_control.h>
extern __thread fpu_control_t fpu_control;
#endif
// Set the reference hardware floating point unit to FTZ mode
static inline void ForceFTZ(FPU_mode_type *mode)
{
#if defined(__i386__) || defined(__x86_64__) || defined(_MSC_VER)              \
    || defined(__MINGW32__)
    *mode = _mm_getcsr();
    _mm_setcsr(*mode | 0x8040);
#elif defined(__PPC__)
    *mode = fpu_control;
    fpu_control |= _FPU_MASK_NI;
#elif defined(__arm__)
    unsigned fpscr;
    __asm__ volatile("fmrx %0, fpscr" : "=r"(fpscr));
    *mode = fpscr;
    __asm__ volatile("fmxr fpscr, %0" ::"r"(fpscr | (1U << 24)));
    // Add 64 bit support
#elif defined(__aarch64__)
    unsigned fpscr;
    __asm__ volatile("mrs %0, fpcr" : "=r"(fpscr));
    *mode = fpscr;
    __asm__ volatile("msr fpcr, %0" ::"r"(fpscr | (1U << 24)));
#else
#error ForceFTZ needs an implentation
#endif
}

// Disable the denorm flush to zero
static inline void DisableFTZ(FPU_mode_type *mode)
{
#if defined(__i386__) || defined(__x86_64__) || defined(_MSC_VER)              \
    || defined(__MINGW32__)
    *mode = _mm_getcsr();
    _mm_setcsr(*mode & ~0x8040);
#elif defined(__PPC__)
    *mode = fpu_control;
    fpu_control &= ~_FPU_MASK_NI;
#elif defined(__arm__)
    unsigned fpscr;
    __asm__ volatile("fmrx %0, fpscr" : "=r"(fpscr));
    *mode = fpscr;
    __asm__ volatile("fmxr fpscr, %0" ::"r"(fpscr & ~(1U << 24)));
    // Add 64 bit support
#elif defined(__aarch64__)
    unsigned fpscr;
    __asm__ volatile("mrs %0, fpcr" : "=r"(fpscr));
    *mode = fpscr;
    __asm__ volatile("msr fpcr, %0" ::"r"(fpscr & ~(1U << 24)));
#else
#error DisableFTZ needs an implentation
#endif
}

// Restore the reference hardware to floating point state indicated by *mode
static inline void RestoreFPState(FPU_mode_type *mode)
{
#if defined(__i386__) || defined(__x86_64__) || defined(_MSC_VER)              \
    || defined(__MINGW32__)
    _mm_setcsr(*mode);
#elif defined(__PPC__)
    fpu_control = *mode;
#elif defined(__arm__)
    __asm__ volatile("fmxr fpscr, %0" ::"r"(*mode));
    // Add 64 bit support
#elif defined(__aarch64__)
    __asm__ volatile("msr fpcr, %0" ::"r"(*mode));
#else
#error RestoreFPState needs an implementation
#endif
}
#else
#error ForceFTZ and RestoreFPState need implentations
#endif

#endif