C6000系类的内联函数

1.求绝对值函数
(1) _abs()
  C代码  : int _abs(int src)
  汇编: ABS
  功能: 求32位数据的绝对值
(2) _labs()
  C代码: int _labs(long src)
  汇编: ABS
  功能: 求40位数据的绝对值
(3) _abs2()
  C代码: int _abs2(int src)
  汇编: ABS2
  功能：同时求高16位和低16位的绝对值,即
   return[31:16] = |src[31:16]|
   return[15: 0] = |src[15: 0]|
2.运算指令
(1) _add2()
  C代码: int _add2(int src1,int src2)
  汇编: ADD2
  功能: 同时进行src1,src2的高16位和src1,src2的低16位相加，忽略任何进位，即
   return[31:16] = src1[31:16] + src2[31:16]
   return[15: 0] = src1[15: 0] + src2[15: 0]
(2) _sadd()
  C代码: int _sadd(int src1,int src2)
  汇编: SADD
  功能：普通A+B的加法
（3） _lsadd()
  C代码: long _lsadd(int src1,long src2)
  汇编: SADD
  功能: 32位数据加上40位数据，返回为40位数据
(4) _add4()
  C代码: int _add4(int src1,int src2)
  汇编: ADD4
  功能: 同时进行src1和src2的每个对应Byte的4次加法,忽略任何进位,即
   return[31:24] = src1[31:24] + src2[31:24]
   return[23:16] = src1[23:16] + src2[23:16]
   return[15: 8] = src1[15: 8] + src2[15: 8]
   return[ 7: 0] = src1[ 7: 0] + src2[ 7: 0]
  备注: src1,src2的每个8位数据当做signed数据使用
(5) _sadd2()
  C代码: int _sadd2(int src1,int src2)
  汇编: SADD2
  功能：同时进行src1,src2的高16位和低16位相加，忽略任何进位.即
   return[31:16] = src1[31:16] + src2[31:16]
   return[15: 0] = src1[15: 0] + src2[15: 0]
  备注: src1,src2的每个16位数据被当做signed数据

(6) _saddus2()
  C代码: int _saddus2(unsigned src1,int src2)
  汇编: SADDUS2
  功能: 执行和_sadd2一样的操作，但src1解释不同，见备注
  备注: src1的每个16位数据被当作unsigned数据，src2的每个16位数据被当作signed数据

(7) _saddu4()
  C代码: unsigned _saddu4(unsigned src1,unsigned src2)
  汇编: SADDU4
  功能: 执行和_add4()一样的操作，但数据解释为unsigned,限值为0xff

(8) _addsub()
  C代码: long long _addsub(int src1,int src2)
  汇编: ADDSUB
  功能:同时进行src1 + src2和src1 - src2操作,即
   hi32(return) = src1 + src2
   low32(return) = src - src2

(9) _addsub2()
  C代码: long long _addsub2(int src1,int src2)
  汇编: ADDSUB2
  功能: 同时进行_add2()和_sub2()操作，即
   return[63:48] = hi16(src1) + hi16(src2)
   return[47:32] = low16(src1) + low16(src2)
   return[31:16] = hi16(src1) - hi16(src2)
   return[15:0] = low16(src1) - low16(src2)

(10) _saddsub()
  C代码： long long _saddsub(unsigned src1,unsigned src2)
  汇编: SADDSUB
  功能: 同时执行add()和sub()操作,即
   return[63:32] = src1 + src2
   return[31:0] = src1 - src2
(11) _saddsub2()
  C代码: long long _saddsub2(unsigned src1,unsigned src2)
  汇编: SADDSUB2
  功能：同时进行sadd2()和ssub2()操作,即
   return[63:48] = src1[31:16] + src2[31:16]
   return[47:32] = src1[15: 0] + src2[15: 0]
   return[31:16] = src1[31:16] - src2[31:16]
   return[15: 0] = src1[15: 0] - src2[15: 0]

(12) _ssub2()
  C代码: int _ssub2(unsigned src1,unsigned src2)
  汇编: SSUB2
  功能: 同时进行高16位和低16位的减法,即
   return[31:16] = src1[31:16] - src2[31:16]
   return[15: 0] = src1[15: 0] - src2[15: 0]

(13) _mpy2(),_mpy2ll
  C代码: double(long long) _mpy2(int src1,int src2),long long _mpy2ll(int src1,int src2)
  汇编:
  功能：

(15) _mpyhi(),_mpyhill()
  C代码: double _mpyhi(int src1,int src2),long long _mpyhill(int src1,int src2)
  汇编: MPYHI
  功能: 执行16位 * 32位操作,即
   return = src1[31:16] * src2[31: 0]

(15) _mpyli(),_mpylill()
  C代码: double _mpyli(int src1,int src2),long long _mpylill(int src1,int src2)
  汇编: MPYHI
  功能: 执行16位 * 32位操作,即
   return = src1[15: 0] * src2[31: 0]

(16) _mpyhir()
  C代码： int _mpyhir(int src1,int src2)
  汇编: MPYHIR
  功能: 执行(16位 * 32位 >> 15)操作,即
   return = (src1[31:16] * src2[31: 0]) >> 15;
  备注: 结果看起来被四舍五入了,例如0x1122 * 0x55667788结果应该是0x0b6e4b17,但仿真结果为0x0b6e4b18

(16) _mpylir()
  C代码： int _mpylir(int src1,int src2)
  汇编: MPYLIR
  功能: 执行(16位 * 32位 >> 15)操作,即
   return = (src1[15: 0] * src2[31: 0]) >> 15;
  备注: 结果看起来被四舍五入了,例如0x1122 * 0x55667788结果应该是0x0b6e4b17,但仿真结果为0x0b6e4b18
(17) _mpy*u4(),_mpy*u4ll()
  C代码: double _mpysu4(int src1,int src2),long long _mpysull4(int src1,int src2)
   double _mpyu4(unsigned src1,unsigned src2),long long _mpyu4ll(unsigned src1,unsigned src2)
  汇编: MPYSU4
   MPYU4.M2X B4,A3,B5:A4
  功能：同时执行4个8位 * 8位操作,即
   return[63:48] = src1[31:24] * src2[31:24];
   return[47:32] = src1[23:16] * src2[23:16];
   return[31:16] = src1[15: 8] * src2[15: 8];
   return[15: 0] = src1[ 7: 0] * src2[ 7: 0];
(18) _smpy2(),_smpy2ll()
  C代码： double _smpy2(int src1,int src2),long long _smpy2ll(int src1,int src2)
  汇编: SMPY2
  功能: 同时执行两个16位*16位操作，结果再左移1位,即
   return = ((src1[31:16] * src2[31:16] << 32) + (src1[15: 0] * src2[15: 0])) << 1;
(19) _mpy32**()
  C代码: int _mpy32(int src1,int src2),long long _mpy32ll(int src1,int src2)
         long long _mpy32su(int src1,unsigned src2),long long _mpy32us(unsigned src1,int src2)
         long long _mpy32u(unsigned src1,unsigned src2)
  汇编: MPY32
   MPY32SU.M2X B4,A3,B5:A4
   MPY32US.M2X B4,A3,B5:A4
   MPY32U.M2X B4,A3,B5:A4
  功能: 执行32位 * 32位操作
(20) _mpy2ir()
  C代码： long long _mpy2ir(int src1,int src2)
  汇编： MPY2IR
  功能：返回如下结果
   return[63:32] = src1[31:16] * src2 >> 15
   return[31: 0] = src1[15: 0] * src2 >> 5
  备注: 每一部分可能被四舍五入

(21) _gmpy()
  C代码: unsignd _gmpy(unsigned src1,unsigned src2)
  汇编: GMPY
  功能: 执行"Galois Field multiply"

(22) _smpy**()
  C代码: int _smpy(int src1,int src2),int smpyh(int src1,int src2)
         int _smpyhl(int src1,int src2),int _smpylh(int src1,int src2)
  汇编: SMPY SMPYH
   SMPYHL SMPYLH
  功能: 执行16位*16位操作,结果再左移一位,限值结果为小于x80000000
   _smpy: return[31: 0] = src1[15: 0] * src2[15: 0] << 1
   _smpyh: return[31: 0] = src1[31:16] * src2[31:16] << 1
   _smpyhl:return[31: 0] = src1[31:16] * src2[15: 0] << 1
   _smpylh:return[31: 0] = src1[15: 0] * src2[31:16] << 1
(23) _mpy**()
  C代码: int _mpy(int src1,int src2),int _mpyus(unsigned src1,int src2)
   int _mpysu(int src1,unsigned src2),unsigned _mpyu(unsigned src1,unsigned src2)
  汇编: MPY MPYUS
   MPYSU MPYU
  功能：返回src1[15: 0] * src2[15: 0]的结果
(24) _mpyh**()
  C代码: int _mpyh(int src1,int src2),int _mpyhus(unsigned src1,int src2)
   int _mpyhsu(int src1,unsigned src2),int _mpyhu(unsigned src1,unsigned src2)
  汇编: MPYH MPYHUS
   MPYHSU MPYHU
  功能：返回src1[31:16] * src2[31:16]的结果
(25) _mpyh*l*()
  C代码: int _mpyhl(int src1,int src2),int _mpyhuls(unsigned src1,int src2)
   int _mpyhslu(int src1,unsigned src2),int _mpyhlu(unsigned src1,unsigned src2)
  汇编: MPYHL  MPYHULS
   MPYHSLU  MPYHLU
  功能：返回src1[31:16] * src2[15: 0]的结果
(26) _mpyl*h*()
  C代码: int _mpylh(int src1,int src2),int _mpyluhs(unsigned src1,int src2)
   int _mpylshu(int src1,unsigned src2),int _mpylhu(unsigned src1,unsigned src2)
  汇编: MPYLH  MPYLUHS
   MPYLSHU  MPYLHU
  功能：返回src1[15: 0] * src2[31: 16]的结果

(27) _*ssub()
  C代码： int _ssub(int src1,int src2),long _lssub(int src1,int src2)
  汇编: SSUB.L2X B4,A3,B4
  功能: 执行src1 - src2操作，符号扩展为int或long
(28) _subc()
  C代码：unsigned _subc(int src1,int src2)
  汇编： SUBC
  功能：未知！！

(29) _sub2()
  C代码: int _sub2(int src1,int src2)
  汇编： SUB2
  功能：同时执行高16位和低16位减法,即
   return[31:16] = src1[31:16] - src2[31:16]
   return[15: 0] = src1[15: 0] - src2[15: 0]
(30) _sub4()
  C代码： int _sub4(int src1,int src2)
  汇编: SUB4
  功能：同时执行4个8位减法，即
   return[31:24] = src1[31:24] - src2[31:24]
   return[23:16] = src1[23:16] - src2[23:16]
   return[15: 8] = src1[15: 8] - src2[15: 8]
   return[ 7: 0] = src1[ 7: 0] - src2[ 7: 0]
(31) _subabs4()
  C代码： int _subabs4(int src1,int src2)
  汇编: SUBABS4
  功能：同时执行4个8位减法，再求绝对值，即
   return[31:24] = |src1[31:24] - src2[31:24]|
   return[23:16] = |src1[23:16] - src2[23:16]|
   return[15: 8] = |src1[15: 8] - src2[15: 8]|
   return[ 7: 0] = |src1[ 7: 0] - src2[ 7: 0]|
(32) _avg2()
  C代码: int _avg2(int src1,int src2)
  汇编: AVG2
  功能：计算两路16位平均值，四舍五入结果
   return[31:16] = (src1[31:16] + src2[31:16] + 1) / 2;
   return[15: 0] = (src1[15: 0] + src2[15: 0] + 1) / 2;
(33) _avgu4()
  C代码: int _avgu4(int src1,int src2)
  汇编: AVGU4
  功能：计算四路8位平均值，四舍五入结果
   return[31:24] = (src1[31:24] + src2[31:24] + 1) / 2;
   return[23:16] = (src1[23:16] + src2[23:16] + 1) / 2;
   return[15: 8] = (src1[15: 8] + src2[15: 8] + 1) / 2;
   return[ 7: 0] = (src1[ 7: 0] + src2[ 7: 0] + 1) / 2;

3.位操作指令
(1) _clr()
  C代码: int _clr(unsined src,unsigned csta,unsigned cstb)
  汇编: CLR
  功能: 清除src上的位csta ~ 位cstb,即
   src[cstb:csta] = 0;
  备注: csta必须 <= cstb,且保证 < 32

(2) _clrr()
  C代码: int _clrr(unsigned src,int shift)
  汇编: CLR
  功能: 清除src上的shift[ 9: 5] ~ shift[ 4: 0]位
(3) _set()
  C代码: int _set(unsined src,unsigned csta,unsigned cstb)
  汇编: SET
  功能: 设置src上的位csta ~ 位cstb,即
   src[cstb:csta] = '1';
  备注: csta必须 <= cstb,且保证 < 32
(4) _setr()
  C代码: int _setr(unsigned src,int shift)
  汇编: SET
  功能: 设置src上的shift[ 9: 5] ~ shift[ 4: 0]位为'1'

(5) _sshl()
  C代码: int _sshl(int src,unsigned shift)
  汇编: SSHL
  功能： return[31: 0] = src << shift;
  备注: 有符号扩展功能
(6) _rotl()
  C代码: int _rotl(unsigned src,unsigned shift
  汇编: ROTL
  功能: return[31: 0] = src << shift;
  备注：无符号扩展功能
(7) __shlmb(),__shrmb()
  C代码: int _shlmb(int src1,int src2),int _shrmb(int src1,int src2)
  汇编: SHLMB
  功能: shlmb-->return[31:0] = (src2 << 8) | src1[31:24]
   shrmb-->return[31:0] = (src2 >> 8) | (src1[7: 0] << 24)
(8) __shr2(),_shru2()
  C代码: int _shr2(int src1,unsigned shift),int _shru2(unsigned src1,unsigned shift)
  汇编: SHR2
  功能: return[31: 16] = src1[31:16] >> shift
   return[15:  0] = src1[15: 0] >> shift
  备注: 有符号数操作返回值会进行符号扩展(移出的位全部补1)
(9) _sshvl(),_sshvr()
  C代码： int _sshvl(int src,int shift),int _sshvr(int src,int shift)
  汇编: SSHVL  SSHVR
  功能： sshvl-->return[31: 0] = (src << shift) > MAX_INT?MAX_INT:(src << shift)
   sshvr-->return[31: 0] = (src >> shift) < MIN_INT?MIN_INT:(src >> shift)
(10) _shfl()
  C代码: int _shfl(int src)
  汇编: SHFL
  功能：低16位嵌入到偶位，高16位嵌入到奇位,即
   return[31:0] = src[31]src[15]src[30]src[14]........src[16][src[0]
(11) _ext()
  C代码: int _ext(int src,unsigned lshift,unsigned rshift)
  汇编: EXT
  功能: return[31: 0] = (src << lshift) >> rshift;
(12) _extr()
  C代码: int _extr(int src,int shift)
  汇编: EXT
  功能: return[31: 0] = (src << shift[ 9: 5]) >> shift[4: 0];
(13) _extu()
  C代码: int _extu(int src,unsigned lshift,unsigned rshift)
  汇编: EXT
  功能: return[31: 0] = (src << lshift) >> rshift;
(14) _extur()
  C代码: int _extur(int src,int shift)
  汇编: EXT
  功能: return[31: 0] = (src << shift[ 9: 5]) >> shift[4: 0];
(15) _lmbd()
  C代码: unsigned _lmbd(int zero_or_one,int src)
  汇编: LMBD
  功能：从左到右查找该位是zero_or_one的位，返回该位置
  备注:
zero_or_one必须为0或者1,为其他值无LMBD指令编译
   如src = 0x0fff0000,则
   _lmbd(0,src) == 0 /*D31为'0',所以返回0*/
   _lmbd(1,src) == 4 /*D27为'1',所以返回4*/
  (16) _*norm()
  C代码: unsigned _norm(int src),unsignd _lnorm(long src)
  汇编: NORM B4,B4
  功能: 未知

(17) _bitc4()
  C代码: unsigned _bitc4(unsigned src)
  汇编: BITC4
  功能: 统计每个字节的'1'总数,4个总数合成unsigned返回
  备注:
   例如src = 0x01030507,因为4个字节分别有0x01,0x02,0x03,0x04个'1',所以返回为0x01020304
(18) _bitr()
  C代码: unsigned _bitr(unsigned src)
  汇编: BITR
  功能: 反转所有的位，即return[31:0] = src[ 0:31]
  备注:
   例如src = '00010001000100010001000100010001',则返回值是'10001000100010001000100010001000'
(19) _deal()
  C代码: unsigned _deal(unsigned src)
  汇编: DEAL
功能: 所有偶位组合成一个16位数据，所有奇位组合成一个16位数据，返回该32位值，即
   return[31:16] = src[31,29,27,....,1]
   return[15: 0] = src[30,28,26,....,0]

4.内存操作指令
(1) _amem*()
  C代码: ushort& _amem2(void* ptr),const ushort _amem2_const(void* ptr)
   unsigned& _amem4(void* ptr),const unsigned& _amem4_const(void* ptr)
   long long _amem8(void* ptr),const long long& _amem8_const(void* ptr)
   double & _amemd8(void* ptr),const double& _amemd8_const(void* ptr)
  汇编: 略
  功能: 从对齐地址中读/写n字节数据，n = 以上的数字
  备注:
   读--->
    double val;
    char test[8] = {0,1,2,3,4,5,6,7};
    val = _amem2_const(&test) + _amem4_const(&test) + _amem8_const(&test);
   写--->
    _amem2(&test) = 0x0011;
    _amem4(&test) = 0x00112233;
    _amem8(&test) = 0x0011223344556677;
(2) _mem*()
C代码: ushort& _mem2(void* ptr),const ushort _mem2_const(void* ptr)
   unsigned& _mem4(void* ptr),const unsigned& _mem4_const(void* ptr)
   long long _mem8(void* ptr),const long long& _mem8_const(void* ptr)
   double & _memd8(void* ptr),const double& _memd8_const(void* ptr)
  汇编: 略
  功能: 从非对齐地址中读/写n字节数据，n = 以上的数字
  备注:
   读--->
    double val;
    char test[8] = {0,1,2,3,4,5,6,7};
    val = _mem2_const(&test) + _mem4_const(&test) + _mem8_const(&test);
   写--->
    _mem2(&test) = 0x0011;
    _mem4(&test) = 0x00112233;
    _mem8(&test) = 0x0011223344556677；

(3) _mvd()
  C代码: int _mvd(int src)
  汇编: MVD
  功能：利用4周期乘法流水线拷贝数据,return[31: 0] = src[31: 0]
  备注：这个需要和_mpy**()配合实现并行工作

5.数据包装/转换指令
(1) _hi**()
  C代码: unsigned _hi(double src),unsigned _hill(long long src)
  汇编：无
  功能：返回64位数据的高32位数据
(2) _low**()
  C代码: unsigned _lo(double src),unsigned _loll(long long src)
  汇编：无
  功能：返回64位数据的低32位数据
(3) _*to*()
  C代码: ulong _dtol(double src),unsigned _ftoi(float src)
   double _itod(unsigned hi32,unsigned low32),float _itof(unsigned src)
   long long _itoll(unsigned hi32,unsigned low32),double _ltod(long src)
  汇编：无
  功能：各种数据类型互相转换
(4) _sat()
  C代码: int _sat(long src2)
  汇编： SAT
  功能: 把40位long数据转成32位数据
(5) _pack*2()
  C代码: unsigned _pack2(unsigned src1,unsigned src2),
   unsigned _packh2(unsigned src1,unsigned src2)
  汇编:  PACK2 PACKH2
  功能: _pack2--->return[31:16] = src1[15: 0],return[15: 0] = src2[15: 0]
   _packh2-->return[31:16] = src1[31: 16],return[15: 0] = src2[31: 16]
(6) _pack*4()
  C代码: unsigned _packh4(unsigned src1,unsigned src2),
   unsigned _packl4(unsigned src1,unsigned src2)
  汇编: PACKH4 PACKL4
  功能：返回交替的4字节数据
  备注: 如src1 = 0x11223344,src2 = 0x55667788,则
   _packh4(src1,src2)返回0x11335577
   _packl4(src1,src2)返回0x22446688
(7) _pack**2()
  C代码: unsigned _packhl2(unsigned src1,unsigned src2),
   unsigned _packlh2(unsigned src1,unsigned src2)
  汇编:  PACKHL2 PACKLH2
  功能: _packhl2--->return[31:16] = src1[31: 16],return[15: 0] = src2[15: 0]
   _packlh2-->return[31:16] = src1[15: 0],return[15: 0] = src2[31: 16]

(8) _spack2()
  C代码: int _spack2(int src1,int src2)
  汇编: SPACK2
  功能：把两个32位数据格式化成16位数据，然后组合成32位数据
  备注: return[31: 16] = (int16_t)src1
   return[15: 0] = (int16_t)src2
(9) _spacku4()
  C代码: unsigned _spacku4(int src1,int src2)
  汇编: SPACKU4
  功能：把4个16位数据格式化成4个8位数据，形成32位数据返回
  备注: return[31:24] = (unt8_t)src1[31:16]
   return[23:16] = (unt8_t)src1[15: 0]
   return[15: 8] = (unt8_t)src2[31:16]
   return[ 7: 0] = (unt8_t)src1[15: 0]
(10) _swap4()
  C代码: unsigned _swap(unsigned src)
  汇编: SWAP4
  功能：大小端数据转换
  备注: return[31:24] 和 return[23:16] 交换
   return[15: 8] 和 return[ 7: 0] 交换
(11) _unpkhu4()
C代码: unsigned _unpkhu4(unsigned src)
  汇编: UNPKHU4
  功能: 把两个高8位数据转成两个16位数据
  备注:
   return[31:16] = (uint16_t)src[31:24]
   return[15: 0] = (uint16_t)src[23:16]
(12) _unpklu4()
  C代码: unsigned _unpklu4(unsigned src)
  汇编: UNPKHU4
  功能: 把两个低8位数据转成两个16位数据
  备注:
   return[31:16] = (uint16_t)src[15: 8]
   return[15: 0] = (uint16_t)src[ 7: 0]
6.比较/杂项指令
(1) _cmpeq*() _cmpgt*()
   C代码: int _cmpeq2(int src1,int src2),int _cmpeq4(int src1,int src2)
       int _cmpgt2(int src1,int src2),int _cmpgtu4(unsigned src1,unsigned src2)
   汇编:  CMPEQ2 CMPEQ4
       CMPGT2 CMPGT4
   功能:  同时比较两个16位数据或者4个8位数据,比较结果在返回值的低2位或低四位中
   备注:
_cmpeq2(0x11223344,0x11220000)返回为0x02
       _cmpeq4(0x11223344,0x00223344)返回为0x07
       _cmpgt2(0x00001111,0x0000ffff)返回为0x01
       _cmpgtu4(0x0000ffff,0x0000aaaa)返回0x03
(2) _xpnd*()
   C代码: int _xpnd2(int src),int _xpnd4(int src)
   汇编:  XPND2  XPND4
   功能:  _xpnd2()把src的低2位逻辑值扩展为2个16位逻辑值
       _xpnd4()把src的低4位逻辑值扩展为4个8位逻辑值
   备注:
      _xpnd*()一般和_cmp*()配合实现逻辑扩展
      _xpnd2(0x01) =  0x0000ffff
      _xpnd2(0x03) =  0xffffffff
      _xpnd2(0x00) =  0x00000000
      _xpnd4(0x00) =  0x00000000
      _xpnd4(0x08) =  0xff000000
      _xpnd4(0x07) =  0x00ffffff
      _xpnd4(0x01) =  0x000000ff

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