SIMD相关头文件包括：
//#include <ivec.h>//MMX
//#include <fvec.h>//SSE(also include ivec.h)
//#include <dvec.h>//SSE2(also include fvec.h)
#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为MMX 头文件，其中__m64的定义为：
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;xmmintrin.h为SSE 头文件，此头文件里包含MMX头文件，其中__m128的定义为：
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;emmintrin.h为SSE2头文件，此头文件里包含SSE头文件，其中__m128i和__m128d的定义为：
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;pmmintrin.h为SSE3头文件，其文件中各函数的介绍：
/*New Single precision vector instructions*/
//a=(a0, a1, a2, a3), b=(b0, b1, b2, b3)
//则r0=a0-b0, r1=a1+b1, r2=a2-b2, r3=a3+b3
extern __m128 _mm_addsub_ps(__m128 a, __m128 b);
//a=(a0, a1, a2, a3), b=(b0, b1, b2, b3)
//则r0=a0+a1, r1=a2+a3, r2=b0+b1, r3=b2+b3
extern __m128 _mm_hadd_ps(__m128 a, __m128 b);
//a=(a0, a1, a2, a3), b=(b0, b1, b2, b3)
//则r0=a0-a1, r1=a2-a3, r2=b0-b1, r3=b2-b3
extern __m128 _mm_hsub_ps(__m128 a, __m128 b);
//a=(a0, a1, a2, a3), 则r0=a1, r1=a1, r2=a3, r3=a3
extern __m128 _mm_movehdup_ps(__m128 a);
//a=(a0, a1, a2, a3), 则r0=a0, r1=a0, r2=a2, r3=a2
extern __m128 _mm_moveldup_ps(__m128 a);
/*New double precision vector instructions*/
//a=(a0, a1), b=(b0, b1), 则r0=a0-b0, r1=a1+b1
extern __m128d _mm_addsub_pd(__m128d a, __m128d b);
//a=(a0, a1), b=(b0, b1), 则r0=a0+a1, r1=b0+b1
extern __m128d _mm_hadd_pd(__m128d a, __m128d b);
//a=(a0, a1), b=(b0, b1), 则r0=a0-a1, r1=b0-b1
extern __m128d _mm_hsub_pd(__m128d a, __m128d b);
//r0=r1=dp[0]
extern __m128d _mm_loaddup_pd(double const * dp);
//a=(a0, a1),则r0=r1=a0
extern __m128d _mm_movedup_pd(__m128d a);
/*New unaligned integer vector load instruction*/
//load unaligned data using _mm_lddqu_si128 for best performance
//If the address is not 16-byte aligned, the load begins at the
//highest 16-byte-aligned address less than the address of Data
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*/
//The monitor instruction sets up an address range for hardware monitoring.
//The values of extensions and hints correspond to the values in ECX and EDX
//used by the monitor instruction. They are reserved for future use and should
//be zero for the SSE3-enabled processor. For more information,
//see the Intel or AMD documentation as appropriate.
extern void _mm_monitor(void const *p, unsigned extensions, unsigned hints);
/*Miscellaneous new instructions,
For _mm_mwait, extensions goes in ecx, hints goes in eax*/
//The mwait instruction instructs the processor to enter a wait state in which the
//processor is instructed to monitor the address range between extensions and hints
//and wait for an event or a store to that address range. The values of extensions
//and hints are loaded into the ECX and EAX registers. For more information,
//see the Intel or AMD documentation as appropriate.
extern void _mm_mwait(unsigned extensions, unsigned hints);tmmintrin.h为SSSE3头文件， 其 文件中各函数的介绍：
/*Add horizonally packed [saturated] words, double words,
{X,}MM2/m{128,64} (b) to {X,}MM1 (a).*/
//a=(a0, a1, a2, a3, a4, a5, a6, a7), b=(b0, b1, b2, b3, b4, b5, b6, b7)
//则r0=a0+a1, r1=a2+a3, r2=a4+a5, r3=a6+a7, r4=b0+b1, r5=b2+b3, r6=b4+b5, r7=b6+b7
extern __m128i _mm_hadd_epi16 (__m128i a, __m128i b);
//a=(a0, a1, a2, a3), b=(b0, b1, b2, b3)
//则r0=a0+a1, r1=a2+a3, r2=b0+b1, r3=b2+b3
extern __m128i _mm_hadd_epi32 (__m128i a, __m128i b);
//SATURATE_16(x) is ((x > 32767) ? 32767 : ((x < -32768) ? -32768 : x))
//a=(a0, a1, a2, a3, a4, a5, a6, a7), b=(b0, b1, b2, b3, b4, b5, b6, b7)
//则r0=SATURATE_16(a0+a1), ..., r3=SATURATE_16(a6+a7),
//r4=SATURATE_16(b0+b1), ..., r7=SATURATE_16(b6+b7)
extern __m128i _mm_hadds_epi16 (__m128i a, __m128i b);
//a=(a0, a1, a2, a3), b=(b0, b1, b2, b3)
//则r0=a0+a1, r1=a2+a3, r2=b0+b1, r3=b2+b3
extern __m64 _mm_hadd_pi16 (__m64 a, __m64 b);
//a=(a0, a1), b=(b0, b1), 则r0=a0+a1, r1=b0+b1
extern __m64 _mm_hadd_pi32 (__m64 a, __m64 b);
//SATURATE_16(x) is ((x > 32767) ? 32767 : ((x < -32768) ? -32768 : x))
//a=(a0, a1, a2, a3), b=(b0, b1, b2, b3)
//则r0=SATURATE_16(a0+a1), r1=SATURATE_16(a2+a3),
//r2=SATURATE_16(b0+b1), r3=SATURATE_16(b2+b3)
extern __m64 _mm_hadds_pi16 (__m64 a, __m64 b);
/*Subtract horizonally packed [saturated] words, double words,
{X,}MM2/m{128,64} (b) from {X,}MM1 (a).*/
//a=(a0, a1, a2, a3, a4, a5, a6, a7), b=(b0, b1, b2, b3, b4, b5, b6, b7)
//则r0=a0-a1, r1=a2-a3, r2=a4-a5, r3=a6-a7, r4=b0-b1, r5=b2-b3, r6=b4-b5, r7=b6-b7
extern __m128i _mm_hsub_epi16 (__m128i a, __m128i b);
//a=(a0, a1, a2, a3), b=(b0, b1, b2, b3)
//则r0=a0-a1, r1=a2-a3, r2=b0-b1, r3=b2-b3
extern __m128i _mm_hsub_epi32 (__m128i a, __m128i b);
//SATURATE_16(x) is ((x > 32767) ? 32767 : ((x < -32768) ? -32768 : x))
//a=(a0, a1, a2, a3, a4, a5, a6, a7), b=(b0, b1, b2, b3, b4, b5, b6, b7)
//则r0=SATURATE_16(a0-a1), ..., r3=SATURATE_16(a6-a7),
//r4=SATURATE_16(b0-b1), ..., r7=SATURATE_16(b6-b7)
extern __m128i _mm_hsubs_epi16 (__m128i a, __m128i b);
//a=(a0, a1, a2, a3), b=(b0, b1, b2, b3)
//则r0=a0-a1, r1=a2-a3, r2=b0-b1, r3=b2-b3
extern __m64 _mm_hsub_pi16 (__m64 a, __m64 b);
//a=(a0, a1), b=(b0, b1), 则r0=a0-a1, r1=b0-b1
extern __m64 _mm_hsub_pi32 (__m64 a, __m64 b);
//SATURATE_16(x) is ((x > 32767) ? 32767 : ((x < -32768) ? -32768 : x))
//a=(a0, a1, a2, a3), b=(b0, b1, b2, b3)
//则r0=SATURATE_16(a0-a1), r1=SATURATE_16(a2-a3),
//r2=SATURATE_16(b0-b1), r3=SATURATE_16(b2-b3)
extern __m64 _mm_hsubs_pi16 (__m64 a, __m64 b);
/*Multiply and add packed words,
{X,}MM2/m{128,64} (b) to {X,}MM1 (a).*/
//SATURATE_16(x) is ((x > 32767) ? 32767 : ((x < -32768) ? -32768 : x))
//a=(a0, a1, a2, ..., a13, a14, a15), b=(b0, b1, b2, ..., b13, b14, b15)
//则r0=SATURATE_16((a0*b0)+(a1*b1)), ..., r7=SATURATE_16((a14*b14)+(a15*b15))
//Parameter a contains unsigned bytes. Parameter b contains signed bytes.
extern __m128i _mm_maddubs_epi16 (__m128i a, __m128i b);
//SATURATE_16(x) is ((x > 32767) ? 32767 : ((x < -32768) ? -32768 : x))
//a=(a0, a1, a2, a3, a4, a5, a6, a7), b=(b0, b1, b2, b3, b4, b5, b6, b7)
//则r0=SATURATE_16((a0*b0)+(a1*b1)), ..., r3=SATURATE_16((a6*b6)+(a7*b7))
//Parameter a contains unsigned bytes. Parameter b contains signed bytes.
extern __m64 _mm_maddubs_pi16 (__m64 a, __m64 b);
/*Packed multiply high integers with round and scaling,
{X,}MM2/m{128,64} (b) to {X,}MM1 (a).*/
//a=(a0, a1, a2, a3, a4, a5, a6, a7), b=(b0, b1, b2, b3, b4, b5, b6, b7)
//则r0=INT16(((a0*b0)+0x4000) >> 15), ..., r7=INT16(((a7*b7)+0x4000) >> 15)
extern __m128i _mm_mulhrs_epi16 (__m128i a, __m128i b);
//a=(a0, a1, a2, a3), b=(b0, b1, b2, b3)
//则r0=INT16(((a0*b0)+0x4000) >> 15), ..., r3=INT16(((a3*b3)+0x4000) >> 15)
extern __m64 _mm_mulhrs_pi16 (__m64 a, __m64 b);
/*Packed shuffle bytes
{X,}MM2/m{128,64} (b) by {X,}MM1 (a).*/
//SELECT(a, n) extracts the nth 8-bit parameter from a. The 0th 8-bit parameter
//is the least significant 8-bits, b=(b0, b1, b2, ..., b13, b14, b15), b is mask
//则r0 = (b0 & 0x80) ? 0 : SELECT(a, b0 & 0x0f), ...,
//r15 = (b15 & 0x80) ? 0 : SELECT(a, b15 & 0x0f)
extern __m128i _mm_shuffle_epi8 (__m128i a, __m128i b);
//SELECT(a, n) extracts the nth 8-bit parameter from a. The 0th 8-bit parameter
//is the least significant 8-bits, b=(b0, b1, ..., b7), b is mask
//则r0= (b0 & 0x80) ? 0 : SELECT(a, b0 & 0x07),...,
//r7=(b7 & 0x80) ? 0 : SELECT(a, b7 & 0x07)
extern __m64 _mm_shuffle_pi8 (__m64 a, __m64 b);
/*Packed byte, word, double word sign, {X,}MM2/m{128,64} (b) to
{X,}MM1 (a).*/
//a=(a0, a1, a2, ..., a13, a14, a15), b=(b0, b1, b2, ..., b13, b14, b15)
//则r0=(b0 < 0) ? -a0 : ((b0 == 0) ? 0 : a0), ...,
//r15= (b15 < 0) ? -a15 : ((b15 == 0) ? 0 : a15)
extern __m128i _mm_sign_epi8 (__m128i a, __m128i b);
//a=(a0, a1, a2, a3, a4, a5, a6, a7), b=(b0, b1, b2, b3, b4, b5, b6, b7)
//r0=(b0 < 0) ? -a0 : ((b0 == 0) ? 0 : a0), ...,
//r7= (b7 < 0) ? -a7 : ((b7 == 0) ? 0 : a7)
extern __m128i _mm_sign_epi16 (__m128i a, __m128i b);
//a=(a0, a1, a2, a3), b=(b0, b1, b2, b3)
//则r0=(b0 < 0) ? -a0 : ((b0 == 0) ? 0 : a0), ...,
//r3= (b3 < 0) ? -a3 : ((b3 == 0) ? 0 : a3)
extern __m128i _mm_sign_epi32 (__m128i a, __m128i b);
//a=(a0, a1, a2, a3, a4, a5, a6, a7), b=(b0, b1, b2, b3, b4, b5, b6, b7)
//则r0=(b0 < 0) ? -a0 : ((b0 == 0) ? 0 : a0), ...,
//r7= (b7 < 0) ? -a7 : ((b7 == 0) ? 0 : a7)
extern __m64 _mm_sign_pi8 (__m64 a, __m64 b);
//a=(a0, a1, a2, a3), b=(b0, b1, b2, b3)
//则r0=(b0 < 0) ? -a0 : ((b0 == 0) ? 0 : a0), ...,
//r3= (b3 < 0) ? -a3 : ((b3 == 0) ? 0 : a3)
extern __m64 _mm_sign_pi16 (__m64 a, __m64 b);
//a=(a0, a1), b=(b0, b1), 则r0=(b0 < 0) ? -a0 : ((b0 == 0) ? 0 : a0),
//r1= (b1 < 0) ? -a1 : ((b1 == 0) ? 0 : a1)
extern __m64 _mm_sign_pi32 (__m64 a, __m64 b);
/*Packed align and shift right by n*8 bits,
{X,}MM2/m{128,64} (b) to {X,}MM1 (a).*/
//n: A constant that specifies how many bytes the interim result will be
//shifted to the right, If n > 32, the result value is zero
//CONCAT(a, b) is the 256-bit unsigned intermediate value that is a concatenation of
//parameters a and b. The result is this intermediate value shifted right by n bytes.
//则r= (CONCAT(a, b) >> (n * 8)) & 0xffffffffffffffff
extern __m128i _mm_alignr_epi8 (__m128i a, __m128i b, int n);
//n: An integer constant that specifies how many bytes to shift the interim
//result to the right,If n > 16, the result value is zero
//CONCAT(a, b) is the 128-bit unsigned intermediate value that is formed by
//concatenating parameters a and b. The result value is the rightmost 64 bits after
//shifting this intermediate result right by n bytes
//则r = (CONCAT(a, b) >> (n * 8)) & 0xffffffff
extern __m64 _mm_alignr_pi8 (__m64 a, __m64 b, int n);
/*Packed byte, word, double word absolute value,
{X,}MM2/m{128,64} (b) to {X,}MM1 (a).*/
//a=(a0, a1, a2, ..., a13, a14, a15)
//则r0 = (a0 < 0) ? -a0 : a0, ..., r15 = (a15 < 0) ? -a15 : a15
extern __m128i _mm_abs_epi8 (__m128i a);
//a=(a0, a1, a2, a3, a4, a5, a6, a7)
//则r0 = (a0 < 0) ? -a0 : a0, ..., r7 = (a7 < 0) ? -a7 : a7
extern __m128i _mm_abs_epi16 (__m128i a);
//a=(a0, a1, a2, a3)
//则r0 = (a0 < 0) ? -a0 : a0, ..., r3 = (a3 < 0) ? -a3 : a3
extern __m128i _mm_abs_epi32 (__m128i a);
//a=(a0, a1, a2, a3, a4, a5, a6, a7)
//则r0 = (a0 < 0) ? -a0 : a0, ..., r7 = (a7 < 0) ? -a7 : a7
extern __m64 _mm_abs_pi8 (__m64 a);
//a=(a0, a1, a2, a3)
//则r0 = (a0 < 0) ? -a0 : a0, ..., r3 = (a3 < 0) ? -a3 : a3
extern __m64 _mm_abs_pi16 (__m64 a);
//a=(a0, a1), 则r0 = (a0 < 0) ? -a0 : a0, r1 = (a1 < 0) ? -a1 : a1
extern __m64 _mm_abs_pi32 (__m64 a);
