/******************************************************************************
 *
 * Copyright (C) 2015 The Android Open Source Project
 *
 * 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.
 *
 *****************************************************************************
 * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
*/
/**
*******************************************************************************
* @file
*  ih264_platform_macros.h
*
* @brief
*  Platform specific Macro definitions used in the codec
*
* @author
*  Ittiam
*
* @remarks
*  None
*
*******************************************************************************
*/
#ifndef _IH264_PLATFORM_MACROS_H_
#define _IH264_PLATFORM_MACROS_H_

#include <stdint.h>

#ifndef  ARMV8

static __inline WORD32 CLIP_U8(WORD32 x)
{
    asm("usat %0, #8, %1" : "=r"(x) : "r"(x));
    return x;
}

static __inline WORD32 CLIP_S8(WORD32 x)
{
    asm("ssat %0, #8, %1" : "=r"(x) : "r"(x));
    return x;
}

static __inline WORD32 CLIP_U10(WORD32 x)
{
    asm("usat %0, #10, %1" : "=r"(x) : "r"(x));
    return x;
}

static __inline WORD32 CLIP_S10(WORD32 x)
{
    asm("ssat %0, #10, %1" : "=r"(x) : "r"(x));
    return x;
}

static __inline WORD32 CLIP_U11(WORD32 x)
{
    asm("usat %0, #11, %1" : "=r"(x) : "r"(x));
    return x;
}

static __inline WORD32 CLIP_S11(WORD32 x)
{
    asm("ssat %0, #11, %1" : "=r"(x) : "r"(x));
    return x;
}

static __inline WORD32 CLIP_U12(WORD32 x)
{
    asm("usat %0, #12, %1" : "=r"(x) : "r"(x));
    return x;
}

static __inline WORD32 CLIP_S12(WORD32 x)
{
    asm("ssat %0, #12, %1" : "=r"(x) : "r"(x));
    return x;
}

static __inline WORD32 CLIP_U16(WORD32 x)
{
    asm("usat %0, #16, %1" : "=r"(x) : "r"(x));
    return x;
}
static __inline WORD32 CLIP_S16(WORD32 x)
{
    asm("ssat %0, #16, %1" : "=r"(x) : "r"(x));
    return x;
}


static __inline UWORD32 ITT_BIG_ENDIAN(UWORD32 x)
{
    asm("rev %0, %1" : "=r"(x) : "r"(x));
    return x;
}
#define NOP(nop_cnt)    {UWORD32 nop_i; for (nop_i = 0; nop_i < nop_cnt; nop_i++) asm("nop");}

#else

#define CLIP_U8(x) CLIP3(0, UINT8_MAX, (x))
#define CLIP_S8(x) CLIP3(INT8_MIN, INT8_MAX, (x))

#define CLIP_U10(x) CLIP3(0, 1023, (x))
#define CLIP_S10(x) CLIP3(-512, 511, (x))

#define CLIP_U11(x) CLIP3(0, 2047, (x))
#define CLIP_S11(x) CLIP3(-1024, 1023, (x))

#define CLIP_U12(x) CLIP3(0, 4095, (x))
#define CLIP_S12(x) CLIP3(-2048, 2047, (x))

#define CLIP_U16(x) CLIP3(0, UINT16_MAX, (x))
#define CLIP_S16(x) CLIP3(INT16_MIN, INT16_MAX, (x))

#define ITT_BIG_ENDIAN(x)       __asm__("rev %0, %1" : "=r"(x) : "r"(x));

#define NOP(nop_cnt)                                \
{                                                   \
    UWORD32 nop_i;                                  \
    for (nop_i = 0; nop_i < nop_cnt; nop_i++)       \
        __asm__ __volatile__("mov x0, x0");         \
}

#endif

/*saturating instructions are not available for WORD64 in ARMv7, hence we cannot
 * use inline assembly like other clips*/
#define CLIP_U32(x) CLIP3(0, UINT32_MAX, (x))
#define CLIP_S32(x) CLIP3(INT32_MIN, INT32_MAX, (x))

#define DATA_SYNC() __sync_synchronize()

#define SHL(x,y) (((y) < 32) ? ((x) << (y)) : 0)
#define SHR(x,y) (((y) < 32) ? ((x) >> (y)) : 0)

#define SHR_NEG(val,shift)  ((shift>0)?(val>>shift):(val<<(-shift)))
#define SHL_NEG(val,shift)  ((shift<0)?(val>>(-shift)):(val<<shift))

#define INLINE inline

/* In normal cases, 0 will not be passed as an argument to CLZ and CTZ.
As CLZ and CTZ outputs are used as a shift value in few places, these return
31 for u4_word == 0 case, just to handle error cases gracefully without any
undefined behaviour */

static INLINE UWORD32 CLZ(UWORD32 u4_word)
{
    if(u4_word)
        return (__builtin_clz(u4_word));
    else
        return 31;
}
static INLINE UWORD32 CTZ(UWORD32 u4_word)
{
    if(0 == u4_word)
        return 31;
    else
    {
        unsigned int index;
        index = __builtin_ctz(u4_word);
        return (UWORD32)index;
    }
}

#define MEM_ALIGN8 __attribute__ ((aligned (8)))
#define MEM_ALIGN16 __attribute__ ((aligned (16)))
#define MEM_ALIGN32 __attribute__ ((aligned (32)))

#endif /* _IH264_PLATFORM_MACROS_H_ */