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111
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1 /* PR optimization/10392
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2 * Reporter: marcus@mc.pp.se
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3 * Summary: [3.3/3.4 regression] [SH] optimizer generates faulty array indexing
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4 * Description:
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5 * The address calculation of an index operation on an array on the stack
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6 * can _under some conditions_ get messed up completely
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7 *
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8 * Testcase tweaked by dank@kegel.com
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9 * Problem only happens with -O2 -m4, so it should only happen on sh4,
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10 * but what the heck, let's test other architectures, too.
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11 * Not marked as xfail since it's a regression.
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12 */
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13 /* { dg-do run } */
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14 /* { dg-options "-O2" } */
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15 /* { dg-options "-O2 -m4" { target sh4-*-* } } */
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16 extern void abort (void);
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17 const char *dont_optimize_function_away;
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18
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19 const char *use(const char *str)
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20 {
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21 dont_optimize_function_away = str;
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22 if (str[0] != 'v')
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23 abort();
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24 if (str[1] < '1' || str[1] > '6')
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25 abort();
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26 if (str[2])
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27 abort();
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28 return str[2] ? "notused" : "v6";
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29 }
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30
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31 const char *func(char *a, char *b)
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32 {
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33 char buf[128];
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34 unsigned char i;
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35 const char *result;
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36
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37 char *item[] = {
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38 "v1",
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39 "v2",
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40 };
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41
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42 buf[0] = 'v';
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43 buf[1] = '3';
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44 buf[2] = 0;
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45
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46 for (i = 0; i < 2; i++) {
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47 /* bug is: following line passes wild pointer to use() on sh4 -O2 */
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48 result = use(item[i]);
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49
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50 use(buf);
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51 use(a);
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52 use(b);
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53 result = use(result);
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54 }
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55 return result;
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56 }
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57
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58 int main()
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59 {
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60 func("v4", "v5");
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61 return 0;
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62 }
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63
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