代码

#define N 100000000
#define D 256
#define D1 255
unsigned b[N],*rs[D],t0[D],t1[D],t2[D],t3[D];
void sort(unsigned *a, int n){
#define cal(w,w2,tw,op) \
p=w2-1;\
for(i=0;i<D;++i)rs[i]=p,p+=tw[i];\
for(i=0;i<N;i+=8){\
	p=w+i;\
	*++rs[p[0]op]=p[0],\
	*++rs[p[1]op]=p[1],\
	*++rs[p[2]op]=p[2],\
	*++rs[p[3]op]=p[3],\
	*++rs[p[4]op]=p[4],\
	*++rs[p[5]op]=p[5],\
	*++rs[p[6]op]=p[6],\
	*++rs[p[7]op]=p[7];\
}
unsigned*p,i,x;

for(i=0;i<N;){
#define A x=a[i],++t0[x&D1],++t1[x>>8&D1]/*,++t2[x>>16&D1],++t3[x>>24]*/,++i;
A A A A 
#undef A
}
//for(i=0;i<D;++i)if(t0[i]>50000||t1[i]>50000||t2[i]>50000||t3[i]>50000)asm("movl $2, %eax; int $48");
//cal(a,b,t0,&D1);
//cal(b,a,t1,>>8&D1);
//cal(a,b,t2,>>16&D1);
//cal(b,a,t3,>>24);
}

评测结果