阅读代码的时候遇到了__m128i、_mm_set1_epi8、_mm_loadu_si128、_mm_max_epu8、_mm_min_epu8、_mm_store_si128、_mm_unpackhi_epi8、_mm_adds_epi16、_mm_srli_si128等SIMD指令集，所以想着作一个总结。
0. SIMD基础知识
SIMD是单指令多数据技术，目前Intel处理器支持的SIMD技术包括MMX、SSE以及AVX。
MMX是MultiMedia eXtensions(多媒体扩展)的缩写，是第六代CPU芯片的重要特点。它是继Intel386?处理器(将体系结构扩展至32位)之后对Intel体系结构最重要的加强，这些指令集能够加速有关图形、影像、声音等的应用。其中，MMX提供了8个64bit的寄存器进行SIMD操作。
SSE是"因特尔数据流单指令序列扩展(Internet Streaming SIMD Extensions)"的缩写。SSE除保持原有的MMX指令外，又新添加了70条指令，在加快浮点运算的同时，改善了内存的使用效率，使内存速度更快。其中，SSE系列提供了8个128bit的寄存器进行SIMD操作。
AVX指令集是Sandy Bridge和Larrabee架构下的新指令集，在单指令多数据流计算性能增加的同时也沿用了MMX/SSE指令集，是在之前的128位扩展到256位的单指令多数据流，不过和MMX/SSE的不同点在于增强的AVX指令，从指令的格式上就发生了很大的变化。
1. 如何使用SIMD指令以及其相关头文件
使用SIMD指令有两种方式：一是直接在C/C++中嵌入(汇编)指令；而是使用Intel C++ Compiler或是Microsoft Visual C++提供的支持SIMD指令集的intrinsics内联函数。从代码可读和维护角度讲，推荐使用intrinsics内联函数的形式。intrinsics是对MMX、SSE等指令集的一种封装，以函数的形式提供，使得程序员更容易编写和使用这些高级指令，在编译的时候，这些函数会被内联为汇编，不会产生函数调用的开销。要想使用SIMD指令，则需要包含对应的头文件。
接下来介绍一下头文件之间的关系：
#include <mmintrin.h> //MMX
#include <xmmintrin.h> //SSE(include mmintrin.h)
#include <emmintrin.h> //SSE2(include xmmintrin.h)
#include <pmmintrin.h> //SSE3(include emmintrin.h)
#include <tmmintrin.h> //SSSE3(include pmmintrin.h)
#include <smmintrin.h> //SSE4.1(include tmmintrin.h)
#include <nmmintrin.h> //SSE4.2(include smmintrin.h)
#include <wmmintrin.h> //AES(include nmmintrin.h)
#include <immintrin.h> //AVX(include wmmintrin.h)
#include <intrin.h> //(include immintrin.h)
mmintrin.h ∈ xmmintrin.h ∈ emmintrin.h ∈ pmmintrin.h ∈ tmmintrin.h ∈ smmintrin.h ∈ nmmintrin.h ∈ wmmintrin.h ∈ immintrin.h ∈ intrin.h
2. 变量类型
>>>__m64
mmintrin.h为MMX头文件，__m64的定义就来自这个头文件：
typedef union __declspec(intrin_type) _CRT_ALIGN(8) __m64
{
unsigned __int64 m64_u64;
float m64_f32[2];
__int8 m64_i8[8];
__int16 m64_i16[4];
__int32 m64_i32[2];
__int64 m64_i64;
unsigned __int8 m64_u8[8];
unsigned __int16 m64_u16[4];
unsigned __int32 m64_u32[2];
} __m64;
可以看到，__m64为一个共用体(union)类型，union的特点为：所有成员占用同一段内存，在不同的时间保存不同的数据类型和不同长度的变量。在union中，所有的共用体成员公用一个空间，并且同一时间只能存储其中一个成员变量的值。__m64的大小为64位，其中，__declspec(align(8))是设置内存对齐方式(8字节对齐)，来保证__m64的大小为64位。__m64这种类型的变量可用作MMX指令的操作数，它不能直接被访问，被自动分配为8个字节的字长。
>>>__m128
xmmintrin.h为SSE头文件，__m128的定义就来自于这个头文件：
typedef union __declspec(intrin_type) _CRT_ALIGN(16) __m128 {
float m128_f32[4];
unsigned __int64 m128_u64[2];
__int8 m128_i8[16];
__int16 m128_i16[8];
__int32 m128_i32[4];
__int64 m128_i64[2];
unsigned __int8 m128_u8[16];
unsigned __int16 m128_u16[8];
unsigned __int32 m128_u32[4];
} __m128;
>>>__m128i 和 __m128d
emmintrin.h为SSE2头文件，其中__m128i和__m128d的定义就来自于这个头文件：
typedef union __declspec(intrin_type) _CRT_ALIGN(16) __m128i {
__int8 m128i_i8[16];
__int16 m128i_i16[8];
__int32 m128i_i32[4];
__int64 m128i_i64[2];
unsigned __int8 m128i_u8[16];
unsigned __int16 m128i_u16[8];
unsigned __int32 m128i_u32[4];
unsigned __int64 m128i_u64[2];
} __m128i;
typedef struct __declspec(intrin_type) _CRT_ALIGN(16) __m128d {
double m128d_f64[2];
} __m128d;
>>>__m256、__m256d 和 __m256i
immintrin.h为AVX头文件，其中__m256、__m256d和__m256i的定义就来自于这个头文件：
typedef union __declspec(intrin_type) _CRT_ALIGN(32) __m256 {
float m256_f32[8];
} __m256;
typedef struct __declspec(intrin_type) _CRT_ALIGN(32) {
double m256d_f64[4];
} __m256d;
typedef union __declspec(intrin_type) _CRT_ALIGN(32) __m256i {
__int8 m256i_i8[32];
__int16 m256i_i16[16];
__int32 m256i_i32[8];
__int64 m256i_i64[4];
unsigned __int8 m256i_u8[32];
unsigned __int16 m256i_u16[16];
unsigned __int32 m256i_u32[8];
unsigned __int64 m256i_u64[4];
} __m256i;
3. 函数接口
>>>mmintrin.h头文件中的函数接口
/* General support intrinsics */
void _m_empty(void);
__m64 _m_from_int(int _I);
int _m_to_int(__m64 _M);
__m64 _m_packsswb(__m64 _MM1, __m64 _MM2);
__m64 _m_packssdw(__m64 _MM1, __m64 _MM2);
__m64 _m_packuswb(__m64 _MM1, __m64 _MM2);
__m64 _m_punpckhbw(__m64 _MM1, __m64 _MM2);
__m64 _m_punpckhwd(__m64 _MM1, __m64 _MM2);
__m64 _m_punpckhdq(__m64 _MM1, __m64 _MM2);
__m64 _m_punpcklbw(__m64 _MM1, __m64 _MM2);
__m64 _m_punpcklwd(__m64 _MM1, __m64 _MM2);
__m64 _m_punpckldq(__m64 _MM1, __m64 _MM2);
/* Packed arithmetic intrinsics */
__m64 _m_paddb(__m64 _MM1, __m64 _MM2);
__m64 _m_paddw(__m64 _MM1, __m64 _MM2);
__m64 _m_paddd(__m64 _MM1, __m64 _MM2);
__m64 _m_paddsb(__m64 _MM1, __m64 _MM2);
__m64 _m_paddsw(__m64 _MM1, __m64 _MM2);
__m64 _m_paddusb(__m64 _MM1, __m64 _MM2);
__m64 _m_paddusw(__m64 _MM1, __m64 _MM2);
__m64 _m_psubb(__m64 _MM1, __m64 _MM2);
__m64 _m_psubw(__m64 _MM1, __m64 _MM2);
__m64 _m_psubd(__m64 _MM1, __m64 _MM2);
__m64 _m_psubsb(__m64 _MM1, __m64 _MM2);
__m64 _m_psubsw(__m64 _MM1, __m64 _MM2);
__m64 _m_psubusb(__m64 _MM1, __m64 _MM2);
__m64 _m_psubusw(__m64 _MM1, __m64 _MM2);
__m64 _m_pmaddwd(__m64 _MM1, __m64 _MM2);
__m64 _m_pmulhw(__m64 _MM1, __m64 _MM2);
__m64 _m_pmullw(__m64 _MM1, __m64 _MM2);
/* Shift intrinsics */
__m64 _m_psllw(__m64 _M, __m64 _Count);
__m64 _m_psllwi(__m64 _M, int _Count);
__m64 _m_pslld(__m64 _M, __m64 _Count);
__m64 _m_pslldi(__m64 _M, int _Count);
__m64 _m_psllq(__m64 _M, __m64 _Count);
__m64 _m_psllqi(__m64 _M, int _Count);
__m64 _m_psraw(__m64 _M, __m64 _Count);
__m64 _m_psrawi(__m64 _M, int _Count);
__m64 _m_psrad(__m64 _M, __m64 _Count);
__m64 _m_psradi(__m64 _M, int _Count);
__m64 _m_psrlw(__m64 _M, __m64 _Count);
__m64 _m_psrlwi(__m64 _M, int _Count);
__m64 _m_psrld(__m64 _M, __m64 _Count);
__m64 _m_psrldi(__m64 _M, int _Count);
__m64 _m_psrlq(__m64 _M, __m64 _Count);
__m64 _m_psrlqi(__m64 _M, int _Count);
/* Logical intrinsics */
__m64 _m_pand(__m64 _MM1, __m64 _MM2);
__m64 _m_pandn(__m64 _MM1, __m64 _MM2);
__m64 _m_por(__m64 _MM1, __m64 _MM2);
__m64 _m_pxor(__m64 _MM1, __m64 _MM2);
/* Comparison intrinsics */
__m64 _m_pcmpeqb(__m64 _MM1, __m64 _MM2);
__m64 _m_pcmpeqw(__m64 _MM1, __m64 _MM2);
__m64 _m_pcmpeqd(__m64 _MM1, __m64 _MM2);
__m64 _m_pcmpgtb(__m64 _MM1, __m64 _MM2);
__m64 _m_pcmpgtw(__m64 _MM1, __m64 _MM2);
__m64 _m_pcmpgtd(__m64 _MM1, __m64 _MM2);
/* Utility intrinsics */
__m64 _mm_setzero_si64(void);
__m64 _mm_set_pi32(int _I1, int _I0);
__m64 _mm_set_pi16(short _S3, short _S2, short _S1, short _S0);
__m64 _mm_set_pi8(char _B7, char _B6, char _B5, char _B4,
char _B3, char _B2, char _B1, char _B0);
__m64 _mm_set1_pi32(int _I);
__m64 _mm_set1_pi16(short _S);
__m64 _mm_set1_pi8(char _B);
__m64 _mm_setr_pi32(int _I1, int _I0);
__m64 _mm_setr_pi16(short _S3, short _S2, short _S1, short _S0);
__m64 _mm_setr_pi8(char _B7, char _B6, char _B5, char _B4,
char _B3, char _B2, char _B1, char _B0);
>>>xmmintrin.h头文件中的函数接口
/*
* FP, arithmetic
*/
extern __m128 _mm_add_ss(__m128 _A, __m128 _B);
extern __m128 _mm_add_ps(__m128 _A, __m128 _B);
extern __m128 _mm_sub_ss(__m128 _A, __m128 _B);
extern __m128 _mm_sub_ps(__m128 _A, __m128 _B);
extern __m128 _mm_mul_ss(__m128 _A, __m128 _B);
extern __m128 _mm_mul_ps(__m128 _A, __m128 _B);
extern __m128 _mm_div_ss(__m128 _A, __m128 _B);
extern __m128 _mm_div_ps(__m128 _A, __m128 _B);
extern __m128 _mm_sqrt_ss(__m128 _A);
extern __m128 _mm_sqrt_ps(__m128 _A);
extern __m128 _mm_rcp_ss(__m128 _A);
extern __m128 _mm_rcp_ps(__m128 _A);
extern __m128 _mm_rsqrt_ss(__m128 _A);
extern __m128 _mm_rsqrt_ps(__m128 _A);
extern __m128 _mm_min_ss(__m128 _A, __m128 _B);
extern __m128 _mm_min_ps(__m128 _A, __m128 _B);
extern __m128 _mm_max_ss(__m128 _A, __m128 _B);
extern __m128 _mm_max_ps(__m128 _A, __m128 _B);
/*
* FP, logical
*/
extern __m128 _mm_and_ps(__m128 _A, __m128 _B);
extern __m128 _mm_andnot_ps(__m128 _A, __m128 _B);
extern __m128 _mm_or_ps(__m128 _A, __m128 _B);
extern __m128 _mm_xor_ps(__m128 _A, __m128 _B);
/*
* FP, comparison
*/
extern __m128 _mm_cmpeq_ss(__m128 _A, __m128 _B);
extern __m128 _mm_cmpeq_ps(__m128 _A, __m128 _B);
extern __m128 _mm_cmplt_ss(__m128 _A, __m128 _B);
extern __m128 _mm_cmplt_ps(__m128 _A, __m128 _B);
extern __m128 _mm_cmple_ss(__m128 _A, __m128 _B);
extern __m128 _mm_cmple_ps(__m128 _A, __m128 _B);
extern __m128 _mm_cmpgt_ss(__m128 _A, __m128 _B);
extern __m128 _mm_cmpgt_ps(__m128 _A, __m128 _B);
extern __m128 _mm_cmpge_ss(__m128 _A, __m128 _B);
extern __m128 _mm_cmpge_ps(__m128 _A, __m128 _B);
extern __m128 _mm_cmpneq_ss(__m128 _A, __m128 _B);
extern __m128 _mm_cmpneq_ps(__m128 _A, __m128 _B);
extern __m128 _mm_cmpnlt_ss(__m128 _A, __m128 _B);
extern __m128 _mm_cmpnlt_ps(__m128 _A, __m128 _B);
extern __m128 _mm_cmpnle_ss(__m128 _A, __m128 _B);
extern __m128 _mm_cmpnle_ps(__m128 _A, __m128 _B);
extern __m128 _mm_cmpngt_ss(__m128 _A, __m128 _B);
extern __m128 _mm_cmpngt_ps(__m128 _A, __m128 _B);
extern __m128 _mm_cmpnge_ss(__m128 _A, __m128 _B);
extern __m128 _mm_cmpnge_ps(__m128 _A, __m128 _B);
extern __m128 _mm_cmpord_ss(__m128 _A, __m128 _B);
extern __m128 _mm_cmpord_ps(__m128 _A, __m128 _B);
extern __m128 _mm_cmpunord_ss(__m128 _A, __m128 _B);
extern __m128 _mm_cmpunord_ps(__m128 _A, __m128 _B);
extern int _mm_comieq_ss(__m128 _A, __m128 _B);
extern int _mm_comilt_ss(__m128 _A, __m128 _B);
extern int _mm_comile_ss(__m128 _A, __m128 _B);
extern int _mm_comigt_ss(__m128 _A, __m128 _B);
extern int _mm_comige_ss(__m128 _A, __m128 _B);
extern int _mm_comineq_ss(__m128 _A, __m128 _B);
extern int _mm_ucomieq_ss(__m128 _A, __m128 _B);
extern int _mm_ucomilt_ss(__m128 _A, __m128 _B);
extern int _mm_ucomile_ss(__m128 _A, __m128 _B);
extern int _mm_ucomigt_ss(__m128 _A, __m128 _B);
extern int _mm_ucomige_ss(__m128 _A, __m128 _B);
extern int _mm_ucomineq_ss(__m128 _A, __m128 _B);
/*
* FP, conversions
*/
extern int _mm_cvt_ss2si(__m128 _A);
extern __m64 _mm_cvt_ps2pi(__m128 _A);
extern int _mm_cvtt_ss2si(__m128 _A);
extern __m64 _mm_cvtt_ps2pi(__m128 _A);
extern __m128 _mm_cvt_si2ss(__m128, int);
extern __m128 _mm_cvt_pi2ps(__m128, __m64);
extern float _mm_cvtss_f32(__m128 _A);
/*
* Support for 64-bit extension intrinsics
*/
#if defined (_M_X64)
extern __int64 _mm_cvtss_si64(__m128 _A);
extern __int64 _mm_cvttss_si64(__m128 _A);
extern __m128 _mm_cvtsi64_ss(__m128 _A, __int64 _B);
#endif /* defined (_M_X64) */
/*
* FP, misc
*/
extern __m128 _mm_shuffle_ps(__m128 _A, __m128 _B, unsigned int _Imm8);
extern __m128 _mm_unpackhi_ps(__m128 _A, __m128 _B);
extern __m128 _mm_unpacklo_ps(__m128 _A, __m128 _B);
extern __m128 _mm_loadh_pi(__m128, __m64 const*);
extern __m128 _mm_movehl_ps(__m128, __m128);
extern __m128 _mm_movelh_ps(__m128, __m128);
extern void _mm_storeh_pi(__m64 *, __m128);
extern __m128 _mm_loadl_pi(__m128, __m64 const*);
extern void _mm_storel_pi(__m64 *, __m128);
extern int _mm_movemask_ps(__m128 _A);
/*
* Integer extensions
*/
extern int _m_pextrw(__m64, int);
extern __m64 _m_pinsrw(__m64, int, int);
extern __m64 _m_pmaxsw(__m64, __m64);
extern __m64 _m_pmaxub(__m64, __m64);
extern __m64 _m_pminsw(__m64, __m64);
extern __m64 _m_pminub(__m64, __m64);
extern int _m_pmovmskb(__m64);
extern __m64 _m_pmulhuw(__m64, __m64);
extern __m64 _m_pshufw(__m64, int);
extern void _m_maskmovq(__m64, __m64, char *);
extern __m64 _m_pavgb(__m64, __m64);
extern __m64 _m_pavgw(__m64, __m64);
extern __m64 _m_psadbw(__m64, __m64);
/*
* memory & initialization
*/
extern __m128 _mm_set_ss(float _A);
extern __m128 _mm_set_ps1(float _A);
extern __m128 _mm_set_ps(float _A, float _B, float _C, float _D);
extern __m128 _mm_setr_ps(float _A, float _B, float _C, float _D);
extern __m128 _mm_setzero_ps(void);
extern __m128 _mm_load_ss(float const*_A);
extern __m128 _mm_load_ps1(float const*_A);
extern __m128 _mm_load_ps(float const*_A);
extern __m128 _mm_loadr_ps(float const*_A);
extern __m128 _mm_loadu_ps(float const*_A);
extern void _mm_store_ss(float *_V, __m128 _A);
extern void _mm_store_ps1(float *_V, __m128 _A);
extern void _mm_store_ps(float *_V, __m128 _A);
extern void _mm_storer_ps(float *_V, __m128 _A);
extern void _mm_storeu_ps(float *_V, __m128 _A);
extern void _mm_prefetch(char const*_A, int _Sel);
extern void _mm_stream_pi(__m64 *, __m64);
extern void _mm_stream_ps(float *, __m128);
extern __m128 _mm_move_ss(__m128 _A, __m128 _B);
extern void _mm_sfence(void);
extern unsigned int _mm_getcsr(void);
extern void _mm_setcsr(unsigned int);
/******************************************************/
/* UTILITY INTRINSICS FUNCTION DEFINITIONS START HERE */
/******************************************************/
/*********************************************************/
/* NAME : _mm_cvtpi16_ps */
/* DESCRIPTION : Convert 4 16-bit signed integer values */
/* to 4 single-precision float values */
/* IN : __m64 _A */
/* OUT : none */
/* RETURN : __m128 : (float)_A */
/*********************************************************/
__inline __m128 _mm_cvtpi16_ps(__m64 _A)
{
__m128 _Tmp;
__m64 _Ext_val = _mm_cmpgt_pi16(_mm_setzero_si64(), _A);
_Tmp = _mm_cvtpi32_ps(_mm_setzero_ps(), _mm_unpackhi_pi16(_A, _Ext_val));
return(_mm_cvtpi32_ps(_mm_movelh_ps(_Tmp, _Tmp),
_mm_unpacklo_pi16(_A, _Ext_val)));
}
/***********************************************************/
/* NAME : _mm_cvtpu16_ps */
/* DESCRIPTION : Convert 4 16-bit unsigned integer values */
/* to 4 single-precision float values */
/* IN : __m64 _A */
/* OUT : none */
/* RETURN : __m128 : (float)_A */
/***********************************************************/
__inline __m128 _mm_cvtpu16_ps(__m64 _A)
{
__m128 _Tmp;
__m64 _Ext_val = _mm_setzero_si64();
_Tmp = _mm_cvtpi32_ps(_mm_setzero_ps(), _mm_unpackhi_pi16(_A, _Ext_val));
return(_mm_cvtpi32_ps(_mm_movelh_ps(_Tmp, _Tmp),
_mm_unpacklo_pi16(_A, _Ext_val)));
}
/******************************************************/
/* NAME : _mm_cvtps_pi16 */
/* DESCRIPTION : Convert 4 single-precision float */
/* values to 4 16-bit integer values */
/* IN : __m128 a */
/* OUT : none */
/* RETURN : __m64 : (short)a */
/******************************************************/
__inline __m64 _mm_cvtps_pi16(__m128 _A)
{
return _mm_packs_pi32(_mm_cvtps_pi32(_A),
_mm_cvtps_pi32(_mm_movehl_ps(_A, _A)));
}
/******************************************************/
/* NAME : _mm_cvtpi8_ps */
/* DESCRIPTION : Convert 4 8-bit integer values to 4 */
/* single-precision float values */
/* IN : __m64 _A */
/* OUT : none */
/* RETURN : __m128 : (float)_A */
/******************************************************/
__inline __m128 _mm_cvtpi8_ps(__m64 _A)
{
__m64 _Ext_val = _mm_cmpgt_pi8(_mm_setzero_si64(), _A);
return _mm_cvtpi16_ps(_mm_unpacklo_pi8(_A, _Ext_val));
}
/******************************************************/
/* NAME : _mm_cvtpu8_ps */
/* DESCRIPTION : Convert 4 8-bit unsigned integer */
/* values to 4 single-precision float */
/* values */
/* IN : __m64 _A */
/* OUT : none */
/* RETURN : __m128 : (float)_A */
/******************************************************/
__inline __m128 _mm_cvtpu8_ps(__m64 _A)
{
return _mm_cvtpu16_ps(_mm_unpacklo_pi8(_A, _mm_setzero_si64()));
}
/******************************************************/
/* NAME : _mm_cvtps_pi8 */
/* DESCRIPTION : Convert 4 single-precision float */
/* values to 4 8-bit integer values */
/* IN : __m128 _A */
/* OUT : none */
/* RETURN : __m64 : (char)_A */
/******************************************************/
__inline __m64 _mm_cvtps_pi8(__m128 _A)
{
return _mm_packs_pi16(_mm_cvtps_pi16(_A), _mm_setzero_si64());
}
/******************************************************/
/* NAME : _mm_cvtpi32x2_ps */
/* DESCRIPTION : Convert 4 32-bit integer values */
/* to 4 single-precision float values */
/* IN : __m64 _A : operand 1 */
/* __m64 _B : operand 2 */
/* OUT : none */
/* RETURN : __m128 : (float)_A,(float)_B */
/******************************************************/
__inline __m128 _mm_cvtpi32x2_ps(__m64 _A, __m64 _B)
{
return _mm_movelh_ps(_mm_cvt_pi2ps(_mm_setzero_ps(), _A),
_mm_cvt_pi2ps(_mm_setzero_ps(), _B));
}
>>>emmintrin.h头文件中的函数接口
/*
* DP, arithmetic
*/
extern __m128d _mm_add_sd(__m128d _A, __m128d _B);
extern __m128d _mm_add_pd(__m128d _A, __m128d _B);
extern __m128d _mm_sub_sd(__m128d _A, __m128d _B);
extern __m128d _mm_sub_pd(__m128d _A, __m128d _B);
extern __m128d _mm_mul_sd(__m128d _A, __m128d _B);
extern __m128d _mm_mul_pd(__m128d _A, __m128d _B);
extern __m128d _mm_sqrt_sd(__m128d _A, __m128d _B);
extern __m128d _mm_sqrt_pd(__m128d _A);
extern __m128d _mm_div_sd(__m128d _A, __m128d _B);
extern __m128d _mm_div_pd(__m128d _A, __m128d _B);
extern __m128d _mm_min_sd(__m128d _A, __m128d _B);
extern __m128d _mm_min_pd(__m128d _A, __m128d _B);
extern __m128d _mm_max_sd(__m128d _A, __m128d _B);
extern __m128d _mm_max_pd(__m128d _A, __m128d _B);
/*
* DP, logicals
*/
extern __m128d _mm_and_pd(__m128d _A, __m128d _B);
extern __m128d _mm_andnot_pd(__m128d _A, __m128d _B);
extern __m128d _mm_or_pd(__m128d _A, __m128d _B);
extern __m128d _mm_xor_pd(__m128d _A, __m128d _B);
/*
* DP, comparisons
*/
extern __m128d _mm_cmpeq_sd(__m128d _A, __m128d _B);
extern __m128d _mm_cmpeq_pd(__m128d _A, __m128d _B);
extern __m128d _mm_cmplt_sd(__m128d _A, __m128d _B);
extern __m128d _mm_cmplt_pd(__m128d _A, __m128d _B);
extern __m128d _mm_cmple_sd(__m128d _A, __m128d _B);
extern __m128d _mm_cmple_pd(__m128d _A, __m128d _B);
extern __m128d _mm_cmpgt_sd(__m128d _A, __m128d _B);
extern __m128d _mm_cmpgt_pd(__m128d _A, __m128d _B);
extern __m128d _mm_cmpge_sd(__m128d _A, __m128d _B);
extern __m128d _mm_cmpge_pd(__m128d _A, __m128d _B);
extern __m128d _mm_cmpneq_sd(__m128d _A, __m128d _B);
extern __m128d _mm_cmpneq_pd(__m128d _A, __m128d _B);
extern __m128d _mm_cmpnlt_sd(__m128d _A, __m128d _B);
extern __m128d _mm_cmpnlt_pd(__m128d _A, __m128d _B);
extern __m128d _mm_cmpnle_sd(__m128d _A, __m128d _B);
extern __m128d _mm_cmpnle_pd(__m128d _A, __m128d _B);
extern __m128d _mm_cmpngt_sd(__m128d _A, __m128d _B);
extern __m128d _mm_cmpngt_pd(__m128d _A, __m128d _B);
extern __m128d _mm_cmpnge_sd(__m128d _A, __m128d _B);
extern __m128d _mm_cmpnge_pd(__m128d _A, __m128d _B);
extern __m128d _mm_cmpord_pd(__m128d _A, __m128d _B);
extern __m128d _mm_cmpord_sd(__m128d _A, __m128d _B);
extern __m128d _mm_cmpunord_pd(__m128d _A, __m128d _B);
extern __m128d _mm_cmpunord_sd(__m128d _A, __m128d _B);
extern int _mm_comieq_sd(__m128d _A, __m128d _B);
extern int _mm_comilt_sd(__m128d _A, __m128d _B);
extern int _mm_comile_sd(__m128d _A, __m128d _B);
extern int _mm_comigt_sd(__m128d _A, __m128d _B);
extern int _mm_comige_sd(__m128d _A, __m128d _B);
extern int _mm_comineq_sd(__m128d _A, __m128d _B);
extern int _mm_ucomieq_sd(__m128d _A, __m128d _B);
extern int _mm_ucomilt_sd(__m128d _A, __m128d _B);
extern int _mm_ucomile_sd(__m128d _A, __m128d _B);
extern int _mm_ucomigt_sd(__m128d _A, __m128d _B);
extern int _mm_ucomige_sd(__m128d _A, __m128d _B);
extern int _mm_ucomineq_sd(__m128d _A, __m128d _B);
/*
* DP, converts
*/
extern __m128d _mm_cvtepi32_pd(__m128i _A);
extern __m128i _mm_cvtpd_epi32(__m128d _A);
extern __m128i _mm_cvttpd_epi32(__m128d _A);
extern __m128 _mm_cvtepi32_ps(__m128i _A);
extern __m128i _mm_cvtps_epi32(__m128 _A);
extern __m128i _mm_cvttps_epi32(__m128 _A);
extern __m128 _mm_cvtpd_ps(__m128d _A);
extern __m128d _mm_cvtps_pd(__m128 _A);
extern __m128 _mm_cvtsd_ss(__m128 _A, __m128d _B);
extern __m128d _mm_cvtss_sd(__m128d _A, __m128 _B);
extern int _mm_cvtsd_si32(__m128d _A);
extern int _mm_cvttsd_si32(__m128d _A);
extern __m128d _mm_cvtsi32_sd(__m128d _A, int _B);
extern __m64 _mm_cvtpd_pi32(__m128d _A);
extern __m64 _mm_cvttpd_pi32(__m128d _A);
extern __m128d _mm_cvtpi32_pd(__m64 _A);
/*
* DP, misc
*/
extern __m128d _mm_unpackhi_pd(__m128d _A, __m128d _B);
extern __m128d _mm_unpacklo_pd(__m128d _A, __m128d _B);
extern int _mm_movemask_pd(__m128d _A);
extern __m128d _mm_shuffle_pd(__m128d _A, __m128d _B, int _I);
/*
* DP, loads
*/
extern __m128d _mm_load_pd(double const*_Dp);
extern __m128d _mm_load1_pd(double const*_Dp);
extern __m128d _mm_loadr_pd(double const*_Dp);
extern __m128d _mm_loadu_pd(double const*_Dp);
extern __m128d _mm_load_sd(double const*_Dp);
extern __m128d _mm_loadh_pd(__m128d _A, double const*_Dp);
extern __m128d _mm_loadl_pd(__m128d _A, double const*_Dp);
/*
* DP, sets
*/
extern __m128d _mm_set_sd(double _W);
extern __m128d _mm_set1_pd(double _A);
extern __m128d _mm_set_pd(double _Z, double _Y);
extern __m128d _mm_setr_pd(double _Y, double _Z);
extern __m128d _mm_setzero_pd(void);
extern __m128d _mm_move_sd(__m128d _A, __m128d _B);
/*
* DP, stores
*/
extern void _mm_store_sd(double *_Dp, __m128d _A);
extern void _mm_store1_pd(double *_Dp, __m128d _A);
extern void _mm_store_pd(double *_Dp, __m128d _A);
extern void _mm_storeu_pd(double *_Dp, __m128d _A);
extern void _mm_storer_pd(double *_Dp, __m128d _A);
extern void _mm_storeh_pd(double *_Dp, __m128d _A);
extern void _mm_storel_pd(double *_Dp, __m128d _A);
/*
* Integer, arithmetic
*/
extern __m128i _mm_add_epi8(__m128i _A, __m128i _B);
extern __m128i _mm_add_epi16(__m128i _A, __m128i _B);
extern __m128i _mm_add_epi32(__m128i _A, __m128i _B);
extern __m64 _mm_add_si64(__m64 _A, __m64 _B);
extern __m128i _mm_add_epi64(__m128i _A, __m128i _B);
extern __m128i _mm_adds_epi8(__m128i _A, __m128i _B);
extern __m128i _mm_adds_epi16(__m128i _A, __m128i _B);
extern __m128i _mm_adds_epu8(__m128i _A, __m128i _B);
extern __m128i _mm_adds_epu16(__m128i _A, __m128i _B);
extern __m128i _mm_avg_epu8(__m128i _A, __m128i _B);
extern __m128i _mm_avg_epu16(__m128i _A, __m128i _B);
extern __m128i _mm_madd_epi16(__m128i _A, __m128i _B);
extern __m128i _mm_max_epi16(__m128i _A, __m128i _B);
extern __m128i _mm_max_epu8(__m128i _A, __m128i _B);
extern __m128i _mm_min_epi16(__m128i _A, __m128i _B);
extern __m128i _mm_min_epu8(__m128i _A, __m128i _B);
extern __m128i _mm_mulhi_epi16(__m128i _A, __m128i _B);
extern __m128i _mm_mulhi_epu16(__m128i _A, __m128i _B);
extern __m128i _mm_mullo_epi16(__m128i _A, __m128i _B);
extern __m64 _mm_mul_su32(__m64 _A, __m64 _B);
extern __m128i _mm_mul_epu32(__m128i _A, __m128i _B);
extern __m128i _mm_sad_epu8(__m128i _A, __m128i _B);
extern __m128i _mm_sub_epi8(__m128i _A, __m128i _B);
extern __m128i _mm_sub_epi16(__m128i _A, __m128i _B);
extern __m128i _mm_sub_epi32(__m128i _A, __m128i _B);
extern __m64 _mm_sub_si64(__m64 _A, __m64 _B);
extern __m128i _mm_sub_epi64(__m128i _A, __m128i _B);
extern __m128i _mm_subs_epi8(__m128i _A, __m128i _B);
extern __m128i _mm_subs_epi16(__m128i _A, __m128i _B);
extern __m128i _mm_subs_epu8(__m128i _A, __m128i _B);
extern __m128i _mm_subs_epu16(__m128i _A, __m128i _B);
/*
* Integer, logicals
*/
extern __m128i _mm_and_si128(__m128i _A, __m128i _B);
extern __m128i _mm_andnot_si128(__m128i _A, __m128i _B);
extern __m128i _mm_or_si128(__m128i _A, __m128i _B);
extern __m128i _mm_xor_si128(__m128i _A, __m128i _B);
/*
* Integer, shifts
*/
extern __m128i _mm_slli_si128(__m128i _A, int _Imm);
extern __m128i _mm_slli_epi16(__m128i _A, int _Count);
extern __m128i _mm_sll_epi16(__m128i _A, __m128i _Count);
extern __m128i _mm_slli_epi32(__m128i _A, int _Count);
extern __m128i _mm_sll_epi32(__m128i _A, __m128i _Count);
extern __m128i _mm_slli_epi64(__m128i _A, int _Count);
extern __m128i _mm_sll_epi64(__m128i _A, __m128i _Count);
extern __m128i _mm_srai_epi16(__m128i _A, int _Count);
extern __m128i _mm_sra_epi16(__m128i _A, __m128i _Count);
extern __m128i _mm_srai_epi32(__m128i _A, int _Count);
extern __m128i _mm_sra_epi32(__m128i _A, __m128i _Count);
extern __m128i _mm_srli_si128(__m128i _A, int _Imm);
extern __m128i _mm_srli_epi16(__m128i _A, int _Count);
extern __m128i _mm_srl_epi16(__m128i _A, __m128i _Count);
extern __m128i _mm_srli_epi32(__m128i _A, int _Count);
extern __m128i _mm_srl_epi32(__m128i _A, __m128i _Count);
extern __m128i _mm_srli_epi64(__m128i _A, int _Count);
extern __m128i _mm_srl_epi64(__m128i _A, __m128i _Count);
/*
* Integer, comparisons
*/
extern __m128i _mm_cmpeq_epi8(__m128i _A, __m128i _B);
extern __m128i _mm_cmpeq_epi16(__m128i _A, __m128i _B);
extern __m128i _mm_cmpeq_epi32(__m128i _A, __m128i _B);
extern __m128i _mm_cmpgt_epi8(__m128i _A, __m128i _B);
extern __m128i _mm_cmpgt_epi16(__m128i _A, __m128i _B);
extern __m128i _mm_cmpgt_epi32(__m128i _A, __m128i _B);
extern __m128i _mm_cmplt_epi8(__m128i _A, __m128i _B);
extern __m128i _mm_cmplt_epi16(__m128i _A, __m128i _B);
extern __m128i _mm_cmplt_epi32(__m128i _A, __m128i _B);
/*
* Integer, converts
*/
extern __m128i _mm_cvtsi32_si128(int _A);
extern int _mm_cvtsi128_si32(__m128i _A);
/*
* Integer, misc
*/
extern __m128i _mm_packs_epi16(__m128i _A, __m128i _B);
extern __m128i _mm_packs_epi32(__m128i _A, __m128i _B);
extern __m128i _mm_packus_epi16(__m128i _A, __m128i _B);
extern int _mm_extract_epi16(__m128i _A, int _Imm);
extern __m128i _mm_insert_epi16(__m128i _A, int _B, int _Imm);
extern int _mm_movemask_epi8(__m128i _A);
extern __m128i _mm_shuffle_epi32(__m128i _A, int _Imm);
extern __m128i _mm_shufflehi_epi16(__m128i _A, int _Imm);
extern __m128i _mm_shufflelo_epi16(__m128i _A, int _Imm);
extern __m128i _mm_unpackhi_epi8(__m128i _A, __m128i _B);
extern __m128i _mm_unpackhi_epi16(__m128i _A, __m128i _B);
extern __m128i _mm_unpackhi_epi32(__m128i _A, __m128i _B);
extern __m128i _mm_unpackhi_epi64(__m128i _A, __m128i _B);
extern __m128i _mm_unpacklo_epi8(__m128i _A, __m128i _B);
extern __m128i _mm_unpacklo_epi16(__m128i _A, __m128i _B);
extern __m128i _mm_unpacklo_epi32(__m128i _A, __m128i _B);
extern __m128i _mm_unpacklo_epi64(__m128i _A, __m128i _B);
/*
* Integer, loads
*/
extern __m128i _mm_load_si128(__m128i const*_P);
extern __m128i _mm_loadu_si128(__m128i const*_P);
extern __m128i _mm_loadl_epi64(__m128i const*_P);
/*
* Integer, sets
*/
extern __m128i _mm_set_epi64(__m64 _Q1, __m64 _Q0);
extern __m128i _mm_set_epi32(int _I3, int _I2, int _I1, int _I0);
extern __m128i _mm_set_epi16(short _W7, short _W6, short _W5, short _W4,
short _W3, short _W2, short _W1, short _W0);
extern __m128i _mm_set_epi8(char _B15, char _B14, char _B13, char _B12,
char _B11, char _B10, char _B9, char _B8,
char _B7, char _B6, char _B5, char _B4,
char _B3, char _B2, char _B1, char _B0);
extern __m128i _mm_set1_epi64(__m64 _Q);
extern __m128i _mm_set1_epi32(int _I);
extern __m128i _mm_set1_epi16(short _W);
extern __m128i _mm_set1_epi8(char _B);
extern __m128i _mm_setl_epi64(__m128i _Q);
extern __m128i _mm_setr_epi64(__m64 _Q0, __m64 _Q1);
extern __m128i _mm_setr_epi32(int _I0, int _I1, int _I2, int _I3);
extern __m128i _mm_setr_epi16(short _W0, short _W1, short _W2, short _W3,
short _W4, short _W5, short _W6, short _W7);
extern __m128i _mm_setr_epi8(char _B15, char _B14, char _B13, char _B12,
char _B11, char _B10, char _B9, char _B8,
char _B7, char _B6, char _B5, char _B4,
char _B3, char _B2, char _B1, char _B0);
extern __m128i _mm_setzero_si128(void);
/*
* Integer, stores
*/
extern void _mm_store_si128(__m128i *_P, __m128i _B);
extern void _mm_storeu_si128(__m128i *_P, __m128i _B);
extern void _mm_storel_epi64(__m128i *_P, __m128i _Q);
extern void _mm_maskmoveu_si128(__m128i _D, __m128i _N, char *_P);
/*
* Integer, moves
*/
extern __m128i _mm_move_epi64(__m128i _Q);
extern __m128i _mm_movpi64_epi64(__m64 _Q);
extern __m64 _mm_movepi64_pi64(__m128i _Q);
/*
* Cacheability support
*/
extern void _mm_stream_pd(double *_Dp, __m128d _A);
extern void _mm_stream_si128(__m128i *_P, __m128i _A);
extern void _mm_clflush(void const*_P);
extern void _mm_lfence(void);
extern void _mm_mfence(void);
extern void _mm_stream_si32(int *_P, int _I);
extern void _mm_pause(void);
/*
* New convert to float
*/
extern double _mm_cvtsd_f64(__m128d _A);
/*
* Support for casting between various SP, DP, INT vector types.
* Note that these do no conversion of values, they just change
* the type.
*/
extern __m128 _mm_castpd_ps(__m128d);
extern __m128i _mm_castpd_si128(__m128d);
extern __m128d _mm_castps_pd(__m128);
extern __m128i _mm_castps_si128(__m128);
extern __m128 _mm_castsi128_ps(__m128i);
extern __m128d _mm_castsi128_pd(__m128i);
/*
* Support for 64-bit extension intrinsics
*/
#if defined (_M_X64)
extern __int64 _mm_cvtsd_si64(__m128d);
extern __int64 _mm_cvttsd_si64(__m128d);
extern __m128d _mm_cvtsi64_sd(__m128d, __int64);
extern __m128i _mm_cvtsi64_si128(__int64);
extern __int64 _mm_cvtsi128_si64(__m128i);
>>>pmmintrin.h头文件中的函数接口
/*
* New Single precision vector instructions.
*/
extern __m128 _mm_addsub_ps(__m128 /* a */, __m128 /* b */);
extern __m128 _mm_hadd_ps(__m128 /* a */, __m128 /* b */);
extern __m128 _mm_hsub_ps(__m128 /* a */, __m128 /* b */);
extern __m128 _mm_movehdup_ps(__m128 /* a */);
extern __m128 _mm_moveldup_ps(__m128 /* a */);
/*
* New double precision vector instructions.
*/
extern __m128d _mm_addsub_pd(__m128d /* a */, __m128d /* b */);
extern __m128d _mm_hadd_pd(__m128d /* a */, __m128d /* b */);
extern __m128d _mm_hsub_pd(__m128d /* a */, __m128d /* b */);
extern __m128d _mm_loaddup_pd(double const * /* dp */);
extern __m128d _mm_movedup_pd(__m128d /* a */);
/*
* New unaligned integer vector load instruction.
*/
extern __m128i _mm_lddqu_si128(__m128i const * /* p */);
/*
* Miscellaneous new instructions.
*/
/*
* For _mm_monitor p goes in eax, extensions goes in ecx, hints goes in edx.
*/
extern void _mm_monitor(void const * /* p */, unsigned /* extensions */, unsigned /* hints */);
/*
* For _mm_mwait, extensions goes in ecx, hints goes in eax.
*/
extern void _mm_mwait(unsigned /* extensions */, unsigned /* hints */);
>>>tmmintrin.h头文件中的函数接口
// Horizontal Add: add pairs of adjacent words or double words.
// Each field in the result is the sum of two adjacent fields
// from the arguments, with the lower result fields coming from
// the first argument and the upper result fields coming from
// the second argument. The "hadds" forms saturate the signed
// addition rather than wrapping.
extern __m128i _mm_hadd_epi16 (__m128i, __m128i);
extern __m128i _mm_hadd_epi32 (__m128i, __m128i);
extern __m128i _mm_hadds_epi16 (__m128i, __m128i);
extern __m64 _mm_hadd_pi16 (__m64, __m64);
extern __m64 _mm_hadd_pi32 (__m64, __m64);
extern __m64 _mm_hadds_pi16 (__m64, __m64);
// Horizontal Subtract: subtract pairs of adjacent words or double
// words. Each field in the result is the difference of two adjacent
// fields from the arguments, where the upper field is subtracted
// from the lower field. The lower result fields come from
// the first argument and the upper result fields come from
// the second argument. The "hsubs" forms saturate the signed
// subtraction rather than wrapping.
extern __m128i _mm_hsub_epi16 (__m128i, __m128i);
extern __m128i _mm_hsub_epi32 (__m128i, __m128i);
extern __m128i _mm_hsubs_epi16 (__m128i, __m128i);
extern __m64 _mm_hsub_pi16 (__m64, __m64);
extern __m64 _mm_hsub_pi32 (__m64, __m64);
extern __m64 _mm_hsubs_pi16 (__m64, __m64);
// Multiply unsigned bytes by signed bytes and sum the word
// results in pairs with saturation. Each byte of the first
// argument is zero-extended to a word field and each byte
// of the second argument is sign-extended to a word field,
// then each pair of words is multiplied together to give
// signed word intermediate results. Pairs of words from
// that result are added horizontally with saturation
// to give the final result.
extern __m128i _mm_maddubs_epi16 (__m128i, __m128i);
extern __m64 _mm_maddubs_pi16 (__m64, __m64);
// Packed multiply high integers with round and scaling,
// {X,}MM2/m{128,64} (b) to {X,}MM1 (a).
extern __m128i _mm_mulhrs_epi16 (__m128i, __m128i);
extern __m64 _mm_mulhrs_pi16 (__m64, __m64);
// Packed shuffle bytes
// {X,}MM2/m{128,64} (b) by {X,}MM1 (a).
extern __m128i _mm_shuffle_epi8 (__m128i, __m128i);
extern __m64 _mm_shuffle_pi8 (__m64, __m64);
// Packed byte, word, double word sign, {X,}MM2/m{128,64} (b) to
// {X,}MM1 (a).
extern __m128i _mm_sign_epi8 (__m128i, __m128i);
extern __m128i _mm_sign_epi16 (__m128i, __m128i);
extern __m128i _mm_sign_epi32 (__m128i, __m128i);
extern __m64 _mm_sign_pi8 (__m64, __m64);
extern __m64 _mm_sign_pi16 (__m64, __m64);
extern __m64 _mm_sign_pi32 (__m64, __m64);
// Packed align and shift right by n*8 bits,
// {X,}MM2/m{128,64} (b) to {X,}MM1 (a).
extern __m128i _mm_alignr_epi8 (__m128i, __m128i, int);
extern __m64 _mm_alignr_pi8 (__m64, __m64, int);
// Packed byte, word, double word absolute value,
// {X,}MM2/m{128,64} (b) to {X,}MM1 (a).
extern __m128i _mm_abs_epi8 (__m128i);
extern __m128i _mm_abs_epi16 (__m128i);
extern __m128i _mm_abs_epi32 (__m128i);
extern __m64 _mm_abs_pi8 (__m64);
extern __m64 _mm_abs_pi16 (__m64);
extern __m64 _mm_abs_pi32 (__m64);
>>>smmintrin.h头文件中的函数接口
// Integer blend instructions - select data from 2 sources
// using constant or variable mask
extern __m128i _mm_blend_epi16 (__m128i, __m128i, const int /* mask */);
extern __m128i _mm_blendv_epi8 (__m128i, __m128i, __m128i mask);
// Float single precision blend instructions - select data
// from 2 sources using constant/variable mask
extern __m128 _mm_blend_ps (__m128, __m128, const int /* mask */);
extern __m128 _mm_blendv_ps(__m128, __m128, __m128 /* mask */);
// Float double precision blend instructions - select data
// from 2 sources using constant/variable mask
extern __m128d _mm_blend_pd (__m128d, __m128d, const int /* mask */);
extern __m128d _mm_blendv_pd(__m128d, __m128d, __m128d /* mask */);
// Dot product instructions with mask-defined summing and zeroing
// of result's parts
extern __m128 _mm_dp_ps(__m128, __m128, const int /* mask */);
extern __m128d _mm_dp_pd(__m128d, __m128d, const int /* mask */);
// Packed integer 64-bit comparison, zeroing or filling with ones
// corresponding parts of result
extern __m128i _mm_cmpeq_epi64(__m128i, __m128i);
// Min/max packed integer instructions
extern __m128i _mm_min_epi8 (__m128i, __m128i);
extern __m128i _mm_max_epi8 (__m128i, __m128i);
extern __m128i _mm_min_epu16(__m128i, __m128i);
extern __m128i _mm_max_epu16(__m128i, __m128i);
extern __m128i _mm_min_epi32(__m128i, __m128i);
extern __m128i _mm_max_epi32(__m128i, __m128i);
extern __m128i _mm_min_epu32(__m128i, __m128i);
extern __m128i _mm_max_epu32(__m128i, __m128i);
// Packed integer 32-bit multiplication with truncation
// of upper halves of results
extern __m128i _mm_mullo_epi32(__m128i, __m128i);
// Packed integer 32-bit multiplication of 2 pairs of operands
// producing two 64-bit results
extern __m128i _mm_mul_epi32(__m128i, __m128i);
// Packed integer 128-bit bitwise comparison.
// return 1 if (val 'and' mask) == 0
extern int _mm_testz_si128(__m128i /* mask */, __m128i /* val */);
// Packed integer 128-bit bitwise comparison.
// return 1 if (val 'and_not' mask) == 0
extern int _mm_testc_si128(__m128i /* mask */, __m128i /* val */);
// Packed integer 128-bit bitwise comparison
// ZF = ((val 'and' mask) == 0) CF = ((val 'and_not' mask) == 0)
// return 1 if both ZF and CF are 0
extern int _mm_testnzc_si128(__m128i /* mask */, __m128i /* val */);
// Insert single precision float into packed single precision
// array element selected by index.
// The bits [7-6] of the 3d parameter define src index,
// the bits [5-4] define dst index, and bits [3-0] define zeroing
// mask for dst
extern __m128 _mm_insert_ps(__m128 /* dst */, __m128 /* src */, const int /* index */);
// Helper macro to create index-parameter value for _mm_insert_ps
#define _MM_MK_INSERTPS_NDX(srcField, dstField, zeroMask) \
(((srcField)<<6) | ((dstField)<<4) | (zeroMask))
// Extract binary representation of single precision float from
// packed single precision array element selected by index
extern int _mm_extract_ps(__m128 /* src */, const int /* index */);
// Extract single precision float from packed single precision
// array element selected by index into dest
#define _MM_EXTRACT_FLOAT(dest, src, ndx) \
*((int*)&(dest)) = _mm_extract_ps((src), (ndx))
// Extract specified single precision float element
// into the lower part of __m128
#define _MM_PICK_OUT_PS(src, num) \
_mm_insert_ps(_mm_setzero_ps(), (src), \
_MM_MK_INSERTPS_NDX((num), 0, 0x0e))
// Insert integer into packed integer array element
// selected by index
extern __m128i _mm_insert_epi8 (__m128i /* dst */, int /* src */, const int /* index */);
extern __m128i _mm_insert_epi32(__m128i /* dst */, int /* src */, const int /* index */);
#if defined (_M_X64)
extern __m128i _mm_insert_epi64(__m128i /* dst */, __int64 /* src */, const int /* index */);
#endif /* defined (_M_X64) */
// Extract integer from packed integer array element
// selected by index
extern int _mm_extract_epi8 (__m128i /* src */, const int /* index */);
extern int _mm_extract_epi32(__m128i /* src */, const int /* index */);
#if defined (_M_X64)
extern __int64 _mm_extract_epi64(__m128i /* src */, const int /* index */);
#endif /* defined (_M_X64) */
// Horizontal packed word minimum and its index in
// result[15:0] and result[18:16] respectively
extern __m128i _mm_minpos_epu16(__m128i);
// Packed/single float double precision rounding
extern __m128d _mm_round_pd(__m128d /* val */, int /* iRoundMode */);
extern __m128d _mm_round_sd(__m128d /* dst */, __m128d /* val */, int /* iRoundMode */);
// Packed/single float single precision rounding
extern __m128 _mm_round_ps(__m128 /* val */, int /* iRoundMode */);
extern __m128 _mm_round_ss(__m128 /* dst */, __m128 /* val */, int /* iRoundMode */);
// Packed integer sign-extension
extern __m128i _mm_cvtepi8_epi32 (__m128i);
extern __m128i _mm_cvtepi16_epi32(__m128i);
extern __m128i _mm_cvtepi8_epi64 (__m128i);
extern __m128i _mm_cvtepi32_epi64(__m128i);
extern __m128i _mm_cvtepi16_epi64(__m128i);
extern __m128i _mm_cvtepi8_epi16 (__m128i);
// Packed integer zero-extension
extern __m128i _mm_cvtepu8_epi32 (__m128i);
extern __m128i _mm_cvtepu16_epi32(__m128i);
extern __m128i _mm_cvtepu8_epi64 (__m128i);
extern __m128i _mm_cvtepu32_epi64(__m128i);
extern __m128i _mm_cvtepu16_epi64(__m128i);
extern __m128i _mm_cvtepu8_epi16 (__m128i);
// Pack 8 double words from 2 operands into 8 words of result
// with unsigned saturation
extern __m128i _mm_packus_epi32(__m128i, __m128i);
// Sum absolute 8-bit integer difference of adjacent groups of 4 byte
// integers in operands. Starting offsets within operands are
// determined by mask
extern __m128i _mm_mpsadbw_epu8(__m128i /* s1 */, __m128i /* s2 */, const int /* mask */);
/*
* Load double quadword using non-temporal aligned hint
*/
extern __m128i _mm_stream_load_si128(__m128i*);
>>>nmmintrin.h头文件中的函数接口
/*
* Intrinsics for text/string processing.
*/
extern __m128i _mm_cmpistrm (__m128i /* a */, __m128i /* b */, const int /* mode */);
extern int _mm_cmpistri (__m128i /* a */, __m128i /* b */, const int /* mode */);
extern __m128i _mm_cmpestrm (__m128i /* a */, int /* la */, __m128i /* b */, int /* lb */, const int /* mode */);
extern int _mm_cmpestri (__m128i /* a */, int /* la */, __m128i /* b */, int /* lb */, const int /* mode */);
/*
* Intrinsics for text/string processing and reading values of EFlags.
*/
extern int _mm_cmpistrz (__m128i /* a */, __m128i /* b */, const int /* mode */);
extern int _mm_cmpistrc (__m128i /* a */, __m128i /* b */, const int /* mode */);
extern int _mm_cmpistrs (__m128i /* a */, __m128i /* b */, const int /* mode */);
extern int _mm_cmpistro (__m128i /* a */, __m128i /* b */, const int /* mode */);
extern int _mm_cmpistra (__m128i /* a */, __m128i /* b */, const int /* mode */);
extern int _mm_cmpestrz (__m128i /* a */, int /* la */, __m128i /* b */, int /* lb */, const int /* mode */);
extern int _mm_cmpestrc (__m128i /* a */, int /* la */, __m128i /* b */, int /* lb */, const int /* mode */);
extern int _mm_cmpestrs (__m128i /* a */, int /* la */, __m128i /* b */, int /* lb */, const int /* mode */);
extern int _mm_cmpestro (__m128i /* a */, int /* la */, __m128i /* b */, int /* lb */, const int /* mode */);
extern int _mm_cmpestra (__m128i /* a */, int /* la */, __m128i /* b */, int /* lb */, const int /* mode */);
/*
* Packed integer 64-bit comparison, zeroing or filling with ones
* corresponding parts of result
*/
extern __m128i _mm_cmpgt_epi64(__m128i /* val1 */, __m128i /* val2 */);
/*
* Calculate a number of bits set to 1
*/
extern int _mm_popcnt_u32(unsigned int /* v */);
#if defined (_M_X64)
extern __int64 _mm_popcnt_u64(unsigned __int64 /* v */);
#endif /* defined (_M_X64) */
/*
* Accumulate CRC32 (polynomial 0x11EDC6F41) value
*/
extern unsigned int _mm_crc32_u8 (unsigned int /* crc */, unsigned char /* v */);
extern unsigned int _mm_crc32_u16(unsigned int /* crc */, unsigned short /* v */);
extern unsigned int _mm_crc32_u32(unsigned int /* crc */, unsigned int /* v */);
#if defined (_M_X64)
extern unsigned __int64 _mm_crc32_u64(unsigned __int64 /* crc */, unsigned __int64 /* v */);
#endif /
4.实际使用
由于上面头文件中的函数接口比较多，所以仅需要大致了解一下，在用到的时候则需要知道具体函数怎么调用以及功能。这里把最上面说的自己阅读代码时遇到的函数接口做一个简单介绍：
// Sets the 16 signed 8-bit integer values to b.
//将16个有符号8位整数值设置为b。
__m128i _mm_set1_epi8(char b)
// 加载128bits值,返回可以存放在代表寄存器的变量中的值；
// 注意：p不用是一个16-bit对齐的一个变量的地址；
__m128i _mm_loadu_si128 (__m128i *p);
//可存储128位数据；将__m128i 变量a的值存储到p所指定的变量中去；
//p必须是一个16-bit对齐的一个变量的地址。
_mm_store_si128 ( __m128i *p, __m128i a)
//将S0和S1的低64位数以8位为单位进行交错;
//S0：A15 A14 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
//S1：B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
//_mm_unpacklo_epi8（S0，S1）：B7 A7 B6 A6 B5 A5 B4 A4 B3 A3 B2 A2 B1 A1 B0 A0
_mm_unpacklo_epi8（_m128i S0，_m128i S1）
//将两个有符号8位或者无符号16位整数相加
//r0 := a0 + b0
//r1 := a1 + b1
//...
//r7 := a7 + b7
__m128i _mm_add_epi16 (__m128i a, __m128i b);
//右移8*imm8位
_m128i _mm_srli_si128 (__m128i a, int imm8)
