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131
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1 /* PR tree-optimization/83843 */
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2 /* { dg-do run } */
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3 /* { dg-options "-O2 -fdump-tree-store-merging" } */
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4 /* { dg-final { scan-tree-dump-times "Merging successful" 3 "store-merging" { target store_merge } } } */
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5
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6 __attribute__((noipa)) void
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7 foo (unsigned char *buf, unsigned char *tab)
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8 {
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9 tab = __builtin_assume_aligned (tab, 2);
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10 buf = __builtin_assume_aligned (buf, 2);
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11 unsigned v = tab[1] ^ (tab[0] << 8);
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12 buf[0] = ~(v >> 8);
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13 buf[1] = ~v;
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14 }
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15
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16 __attribute__((noipa)) void
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17 bar (unsigned char *buf, unsigned char *tab)
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18 {
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19 tab = __builtin_assume_aligned (tab, 2);
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20 buf = __builtin_assume_aligned (buf, 2);
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21 unsigned v = tab[1] ^ (tab[0] << 8);
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22 buf[0] = (v >> 8);
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23 buf[1] = ~v;
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24 }
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25
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26 __attribute__((noipa)) void
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27 baz (unsigned char *buf, unsigned char *tab)
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28 {
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29 tab = __builtin_assume_aligned (tab, 2);
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30 buf = __builtin_assume_aligned (buf, 2);
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31 unsigned v = tab[1] ^ (tab[0] << 8);
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32 buf[0] = ~(v >> 8);
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33 buf[1] = v;
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34 }
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35
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36 int
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37 main ()
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38 {
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39 volatile unsigned char l1 = 0;
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40 volatile unsigned char l2 = 1;
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41 unsigned char buf[2] __attribute__((aligned (2)));
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42 unsigned char tab[2] __attribute__((aligned (2))) = { l1 + 1, l2 * 2 };
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43 foo (buf, tab);
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44 if (buf[0] != (unsigned char) ~1 || buf[1] != (unsigned char) ~2)
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45 __builtin_abort ();
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46 buf[0] = l1 + 7;
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47 buf[1] = l2 * 8;
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48 bar (buf, tab);
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49 if (buf[0] != 1 || buf[1] != (unsigned char) ~2)
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50 __builtin_abort ();
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51 buf[0] = l1 + 9;
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52 buf[1] = l2 * 10;
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53 baz (buf, tab);
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54 if (buf[0] != (unsigned char) ~1 || buf[1] != 2)
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55 __builtin_abort ();
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56 return 0;
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57 }
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