1. _amemd8 數據以8byte對齊(讀或存)
例:原數據長度爲32-Bit(4byte),在內存中的數據dataIn依次爲
A:01000100110100100111100110011010
B:01000100011111001101001100110011
令C= _amemd8((void*)(dataIn+i))
則C爲:0100010001111100110100110011001101000100110100100111100110011010
2. _ftod Create a double from 2 floats
例:原數據float型變量c爲1.5,二進制爲:
00111111110000000000000000000000
令temp = _ftod(c , c)
則,temp爲:
0011111111000000000000000000000000111111110000000000000000000
000
3. _dmpysp __float2_t _dmpysp (__float2_t src1, __float2_t src2);
例:若B=_dmpysp (CD,EF),其中CD爲8byte,C D爲4byte,EF亦然,則B的值相當於(C*E)(D*F)
4. _hif 將32-Bit double型數據轉化爲16-Bit float型【取高位】
5. _lof 將32-Bit double型數據轉化爲16-Bit float型【取低位】
6. void _nassert (int src); 不生成代碼,告訴優化器一些事情
例:_nassert(nx % 4 == 0); 告訴優化器,nx是4的整數倍