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sse_intrin.h
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sse_intrin.h
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/*
* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The OpenAirInterface Software Alliance licenses this file to You under
* the OAI Public License, Version 1.0 (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.openairinterface.org/?page_id=698
*
* 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.
*-------------------------------------------------------------------------------
* For more information about the OpenAirInterface (OAI) Software Alliance:
*/
/*! \file PHY/sse_intrin.h
* \brief SSE includes and compatibility functions.
*
* This header collects all SSE compatibility functions. To use SSE inside a source file, include only sse_intrin.h.
* The host CPU needs to have support for SSE2 at least. SSE3 and SSE4.1 functions are emulated if the CPU lacks support for them.
* This will slow down the softmodem, but may be valuable if only offline signal processing is required.
*
* \author S. Held
* \email [email protected]
* \company IMST GmbH
* \date 2015
* \version 0.1
*/
#ifndef SSE_INTRIN_H
#define SSE_INTRIN_H
#if defined(__x86_64) || defined(__i386__)
#ifndef __SSE2__
# error SSE2 processor intrinsics disabled
#endif
#include <emmintrin.h>
#include <xmmintrin.h>
#ifdef __SSE3__
# include <pmmintrin.h>
# include <tmmintrin.h>
#endif
#ifdef __SSE4_1__
# include <smmintrin.h>
#endif
#ifdef __AVX2__
# include <immintrin.h>
#endif
// ------------------------------------------------
// compatibility functions if SSE3 or SSE4 is not available
// ------------------------------------------------
#if !defined(__SSE3__) || !defined(__SSE4_1__)
/*! \brief SSE vector type.
*
* this source code fragment is Copyright (c) 2006-2008 Advanced Micro Devices, Inc.
* It is licensed under Apache License 2.0 (compatible to our GPL3).
* see http://sourceforge.net/projects/sseplus
* \author Advanced Micro Devices, Inc.
* \date 2006-2008
* \copyright Apache License 2.0
*/
typedef union {
__m128 f;
__m128d d;
__m128i i;
__m64 m64[ 2];
signed char s8[16];
} ssp_m128;
#endif
// ------------------------------------------------
// compatibility functions if SSE3 is not available
// ------------------------------------------------
#ifndef __SSE3__
#warning SSE3 instruction set not preset
#define _mm_abs_epi16(xmmx) _mm_xor_si128((xmmx),_mm_cmpgt_epi16(_mm_setzero_si128(),(xmmx)))
#define _mm_sign_epi16(xmmx,xmmy) _mm_xor_si128((xmmx),_mm_cmpgt_epi16(_mm_setzero_si128(),(xmmy)))
#define _mm_hadd_epi32(xmmx,xmmy) _mm_unpacklo_epi64(_mm_add_epi32(_mm_shuffle_epi32((xmmx),_MM_SHUFFLE(0,2,0,2)),_mm_shuffle_epi32((xmmx),_MM_SHUFFLE(1,3,1,3))),_mm_add_epi32(_mm_shuffle_epi32((xmmy),_MM_SHUFFLE(0,2,0,2)),_mm_shuffle_epi32((xmmy),_MM_SHUFFLE(1,3,1,3))))
// variant from lte_ul_channel_estimation.c and dlsch_demodulation.c and pmch.c
//#define _mm_abs_epi16(xmmx) _mm_add_epi16(_mm_xor_si128((xmmx),_mm_cmpgt_epi16(_mm_setzero_si128(),(xmmx))),_mm_srli_epi16(_mm_cmpgt_epi16(_mm_setzero_si128(),(xmmx)),15))
// variant from cdot_prod.c
//#define _mm_abs_epi16(xmmx) xmmx=_mm_xor_si128((xmmx),_mm_cmpgt_epi16(_mm_setzero_si128(),(xmmx)))
#define _mm_shuffle_epi8(xmmx,xmmy) ssp_shuffle_epi8_SSE2(xmmx,xmmy)
/*! \brief Helper function.
*
* this source code fragment is Copyright (c) 2006-2008 Advanced Micro Devices, Inc.
* It is licensed under Apache License 2.0 (compatible to our GPL3).
* see http://sourceforge.net/projects/sseplus
* \author Advanced Micro Devices, Inc.
* \date 2006-2008
* \copyright Apache License 2.0
*/
static inline __m128i ssp_comge_epi8_SSE2(__m128i a, __m128i b)
{
__m128i c;
c = _mm_cmpgt_epi8( a, b );
a = _mm_cmpeq_epi8( a, b );
a = _mm_or_si128 ( a, c );
return a;
}
/*! \brief SSE2 emulation of SSE3 _mm_shuffle_epi8().
*
* this source code fragment is Copyright (c) 2006-2008 Advanced Micro Devices, Inc.
* It is licensed under Apache License 2.0 (compatible to our GPL3).
* see http://sourceforge.net/projects/sseplus
* \author Advanced Micro Devices, Inc.
* \date 2006-2008
* \copyright Apache License 2.0
*/
static inline __m128i ssp_shuffle_epi8_SSE2 (__m128i a, __m128i mask)
{
ssp_m128 A,B, MASK, maskZero;
A.i = a;
maskZero.i = ssp_comge_epi8_SSE2( mask, _mm_setzero_si128() );
MASK.i = _mm_and_si128 ( mask, _mm_set1_epi8( (char)0x0F) );
B.s8[ 0] = A.s8[ (MASK.s8[ 0]) ];
B.s8[ 1] = A.s8[ (MASK.s8[ 1]) ];
B.s8[ 2] = A.s8[ (MASK.s8[ 2]) ];
B.s8[ 3] = A.s8[ (MASK.s8[ 3]) ];
B.s8[ 4] = A.s8[ (MASK.s8[ 4]) ];
B.s8[ 5] = A.s8[ (MASK.s8[ 5]) ];
B.s8[ 6] = A.s8[ (MASK.s8[ 6]) ];
B.s8[ 7] = A.s8[ (MASK.s8[ 7]) ];
B.s8[ 8] = A.s8[ (MASK.s8[ 8]) ];
B.s8[ 9] = A.s8[ (MASK.s8[ 9]) ];
B.s8[10] = A.s8[ (MASK.s8[10]) ];
B.s8[11] = A.s8[ (MASK.s8[11]) ];
B.s8[12] = A.s8[ (MASK.s8[12]) ];
B.s8[13] = A.s8[ (MASK.s8[13]) ];
B.s8[14] = A.s8[ (MASK.s8[14]) ];
B.s8[15] = A.s8[ (MASK.s8[15]) ];
B.i = _mm_and_si128( B.i, maskZero.i );
return B.i;
}
#endif // __SSE3__
// ------------------------------------------------
// compatibility functions if SSE4 is not available
// ------------------------------------------------
#ifndef __SSE4_1__
#warning SSE4_1 instruction set not preset
// https://gitorious.org/vc/vc/commit/ee49857ffe5b74c74bc57d501b05519443fc609a license LGPL3
#define _mm_extract_epi32(xmmx,index) _mm_cvtsi128_si32(_mm_srli_si128(xmmx, (index) * 4))
#define _mm_insert_epi8(x,y,z) ssp_insert_epi8_SSE2(x,y,z)
#define _mm_cvtepi8_epi16(x) ssp_cvtepi8_epi16_SSE2(x)
#define _mm_max_epi8(x,y) ssp_max_epi8_SSE2(x,y)
#define _mm_cvtepi16_epi32(x) ssp_cvtepi16_epi32_SSE2(x)
/*! \brief SSE2 emulation of SSE4 _mm_insert_epi8().
*
* this source code fragment is Copyright (c) 2006-2008 Advanced Micro Devices, Inc.
* It is licensed under Apache License 2.0 (compatible to our GPL3).
* see http://sourceforge.net/projects/sseplus
* \author Advanced Micro Devices, Inc.
* \date 2006-2008
* \copyright Apache License 2.0
*/
static inline __m128i ssp_insert_epi8_SSE2( __m128i a, int b, const int ndx )
{
ssp_m128 Ahi, Alo;
b = b & 0xFF; /* Convert to 8-bit integer */
Ahi.i = _mm_unpackhi_epi8( a, _mm_setzero_si128() ); /* Ahi = a_8[8:15] Simulate 8bit integers as 16-bit integers */
Alo.i = _mm_unpacklo_epi8( a, _mm_setzero_si128() ); /* Alo = a_8[0:7] Simulate 8bit integers as 16-bit integers */
/* Insert b as a 16-bit integer to upper or lower half of a */
switch( ndx & 0xF ) {
case 0:
Alo.i = _mm_insert_epi16( Alo.i, b, 0 );
break;
case 1:
Alo.i = _mm_insert_epi16( Alo.i, b, 1 );
break;
case 2:
Alo.i = _mm_insert_epi16( Alo.i, b, 2 );
break;
case 3:
Alo.i = _mm_insert_epi16( Alo.i, b, 3 );
break;
case 4:
Alo.i = _mm_insert_epi16( Alo.i, b, 4 );
break;
case 5:
Alo.i = _mm_insert_epi16( Alo.i, b, 5 );
break;
case 6:
Alo.i = _mm_insert_epi16( Alo.i, b, 6 );
break;
case 7:
Alo.i = _mm_insert_epi16( Alo.i, b, 7 );
break;
case 8:
Ahi.i = _mm_insert_epi16( Ahi.i, b, 0 );
break;
case 9:
Ahi.i = _mm_insert_epi16( Ahi.i, b, 1 );
break;
case 10:
Ahi.i = _mm_insert_epi16( Ahi.i, b, 2 );
break;
case 11:
Ahi.i = _mm_insert_epi16( Ahi.i, b, 3 );
break;
case 12:
Ahi.i = _mm_insert_epi16( Ahi.i, b, 4 );
break;
case 13:
Ahi.i = _mm_insert_epi16( Ahi.i, b, 5 );
break;
case 14:
Ahi.i = _mm_insert_epi16( Ahi.i, b, 6 );
break;
default:
Ahi.i = _mm_insert_epi16( Ahi.i, b, 7 );
}
return _mm_packus_epi16( Alo.i, Ahi.i ); // Pack the 16-bit integers to 8bit again.
///* Another implementation, but slower: */
//ssp_m128 A, B, mask;
//mask.i = _mm_setzero_si128();
//mask.s8[ ndx & 0x0F ] = (ssp_s8)0xFF;
//B.i = _mm_set1_epi8( (ssp_s8)b );
//A.i = _mm_andnot_si128( mask.i, a );
//mask.i = _mm_and_si128( mask.i, B.i );
//A.i = _mm_or_si128( A.i, mask.i );
//return A.i;
}
/*! \brief SSE2 emulation of SSE4 _mm_cvtepi8_epi16().
*
* this source code fragment is Copyright (c) 2006-2008 Advanced Micro Devices, Inc.
* It is licensed under Apache License 2.0 (compatible to our GPL3).
* see http://sourceforge.net/projects/sseplus
* \author Advanced Micro Devices, Inc.
* \date 2006-2008
* \copyright Apache License 2.0
*/
static inline __m128i ssp_cvtepi8_epi16_SSE2 ( __m128i a)
{
__m128i b = _mm_setzero_si128 ();
__m128i c = _mm_unpacklo_epi8(a, b);
__m128i d = _mm_set1_epi16 (128);
b = _mm_and_si128(d, c);
d = _mm_set1_epi16(0x1FE);
b = _mm_mullo_epi16(b, d);
return _mm_add_epi16(c, b);
}
/*! \brief Helper function.
*
* this source code fragment is Copyright (c) 2006-2008 Advanced Micro Devices, Inc.
* It is licensed under Apache License 2.0 (compatible to our GPL3).
* see http://sourceforge.net/projects/sseplus
* \author Advanced Micro Devices, Inc.
* \date 2006-2008
* \copyright Apache License 2.0
*/
static inline __m128i ssp_logical_bitwise_select_SSE2( __m128i a, __m128i b, __m128i mask ) // Bitwise (mask ? a : b)
{
a = _mm_and_si128 ( a, mask ); // clear a where mask = 0
b = _mm_andnot_si128( mask, b ); // clear b where mask = 1
a = _mm_or_si128 ( a, b ); // a = a OR b
return a;
}
/*! \brief SSE2 emulation of SSE4 _mm_max_epi8().
*
* this source code fragment is Copyright (c) 2006-2008 Advanced Micro Devices, Inc.
* It is licensed under Apache License 2.0 (compatible to our GPL3).
* see http://sourceforge.net/projects/sseplus
* \author Advanced Micro Devices, Inc.
* \date 2006-2008
* \copyright Apache License 2.0
*/
static inline __m128i ssp_max_epi8_SSE2( __m128i a, __m128i b )
{
__m128i mask = _mm_cmpgt_epi8( a, b ); // FFFFFFFF where a > b
a = ssp_logical_bitwise_select_SSE2( a, b, mask );
return a;
}
/*! \brief SSE2 emulation of SSE4 _mm_cvtepi16_epi32().
*
* this source code fragment is Copyright (c) 2006-2008 Advanced Micro Devices, Inc.
* It is licensed under Apache License 2.0 (compatible to our GPL3).
* see http://sourceforge.net/projects/sseplus
* \author Advanced Micro Devices, Inc.
* \date 2006-2008
* \copyright Apache License 2.0
*/
static inline __m128i ssp_cvtepi16_epi32_SSE2 ( __m128i a)
{
__m128i b = _mm_set1_epi32 (-1); //0xFFFFFFFF
__m128i c = _mm_unpacklo_epi16(a, b); //FFFFa0**FFFFa1**....
__m128i d = _mm_set1_epi32 (0x8000); //0x8000
b = _mm_andnot_si128(c, d); // 0x80 for positive, 0x00 for negative
d = _mm_slli_epi32(b, 1); // 0x100 for positive, 0x000 for negative
return _mm_add_epi32(c, d);
}
#endif // __SSE4_1__
#elif defined(__arm__)
#include <arm_neon.h>
#endif // x86_64 || i386
#endif // SSE_INTRIN_H