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  1. #include <fenv.h>
  2. #include <math.h>
  3.  
  4. float
  5. truncf (float _x)
  6. {
  7.   float retval;
  8.   unsigned short saved_cw;
  9.   unsigned short tmp_cw;
  10.   __asm__ ("fnstcw %0;" : "=m" (saved_cw)); /* save FPU control word */
  11.   tmp_cw = (saved_cw & ~(FE_TONEAREST | FE_DOWNWARD | FE_UPWARD | FE_TOWARDZERO))
  12.             | FE_TOWARDZERO;
  13.   __asm__ ("fldcw %0;" : : "m" (tmp_cw));
  14.   __asm__ ("frndint;" : "=t" (retval)  : "0" (_x)); /* round towards zero */
  15.   __asm__ ("fldcw %0;" : : "m" (saved_cw) ); /* restore saved control word */
  16.   return retval;
  17. }
  18.