#include "libgcc.h"
  
  DWtype
  __ashldi3(DWtype u, word_type b)
  {
  	const DWunion uu = {.ll = u};
  	const word_type bm = (sizeof (Wtype) * BITS_PER_UNIT) - b;
  	DWunion w;
  
  	if (b == 0)
  		return u;
  
  	if (bm <= 0) {
  		w.s.low = 0;
  		w.s.high = (UWtype) uu.s.low << -bm;
  	} else {
  		const UWtype carries = (UWtype) uu.s.low >> bm;
  
  		w.s.low = (UWtype) uu.s.low << b;
  		w.s.high = ((UWtype) uu.s.high << b) | carries;
  	}
  
  	return w.ll;
  }