fixed_op.h

来自「君正早期ucos系统(只有早期的才不没有打包成库),MPLAYER,文件系统,图」· C头文件 代码 · 共 26 行

#ifndef     FIXED_OP_H
#define     FIXED_OP_H
# define MAD_F_MLX(hi,lo,x,y)\
  do{                                         \
      __asm__ __volatile("mult %2,%3"         \
                       : "=l" (lo), "=h" (hi) \
                       : "%r" (x), "r" (y));  \
  }while(0)

#define INSN_MULT(x,y)\
   ({ signed long hi;\
      signed long lo;\
      MAD_F_MLX(hi,lo,(x),(y));\
      hi;                      \
     })

#define INSN_MULT_SLL(x,y)\
   ({ signed long hi;\
      signed long lo;\
      MAD_F_MLX(hi,lo,(x),(y));\
      hi<<1;                      \
     })

#endif