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312
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1 #include <alloca.h>
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17
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2
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172
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3 int asize = 100;
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4
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5 int f(int i,int j,int k,int *l);
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6 int g();
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313
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7 int f1(int i,int j,int *l,int k);
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8 int g1(int k);
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9 void f2();
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172
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10
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11 int
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12 main()
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13 {
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14 int a[0] ;
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315
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15 for(asize=4;asize<64000;asize=asize*2+12) {
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16 f2(1);
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17 f2(0);
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18 printf("%d %d\n",g(),f(0,1,2,a));
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19 printf("%d %d\n",g1(100),f1(0,1,a,2));
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20 }
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172
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21 return 0;
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22 }
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17
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23
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24 int
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172
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25 g()
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17
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26 {
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172
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27 int k = 0,i;
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28
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315
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29 char *p = alloca(asize<100?100:asize);
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172
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30 for(i=0;i<100;i++) p[i]=i;
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31 for(i=0;i<100;i++) k += p[i];
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32 return k;
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17
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33 }
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172
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34
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35 int
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36 f(int i,int j,int k,int *l)
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37 {
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38 *l = 3;
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39 if (i++ >20) return *l;
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40 return f(i,j,k,(int*)alloca(asize));
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41 }
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313
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42
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43 int
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44 g1(int k)
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45 {
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46 int i;
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47
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315
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48 char *p = ((char *)alloca(asize>100?asize:100))+k;
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313
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49 p -= k;
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50 for(i=0;i<100;i++) p[i]=i;
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51 for(i=0;i<100;i++) k += p[i];
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52 return k;
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53 }
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54
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55 int
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56 f1(int i,int j,int *l,int k)
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57 {
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58 // printf("f1 &i=%x &k=%x\n",&i,&k);
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59 // printf("f1 i=%d j=%d *l=%0x k=%d\n",i,j,l,k);
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60 *l = 3;
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61 printf("f1 i=%d j=%d *l=%0x k=%d\n",i,j,*l,k);
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62 if (i++ >20) return *l;
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63 return f1(i,j,(int*)alloca(asize),k);
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64 }
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65
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66 void
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67 f2(int k)
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68 {
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69 int *l;
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70 if (k==1)
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71 l = alloca(asize);
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72 else
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73 l = 0;
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74 printf("f2: %0x %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d\n",
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75 // l,
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76 0,
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77 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40
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78 );
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79 }
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80
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