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131
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1 /* Test to verify that the temporary doesn't trigger a bogus -Warray-bounds
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2 warning. Distilled from libat_exchange_large_inplace in libatomic/gexch.c.
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3 { dg-do compile }
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4 { dg-options "-O2 -Wall" } */
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5
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6 typedef typeof (sizeof 0) size_t;
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7
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8 extern void *memcpy (void*, const void*, size_t);
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9
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10 void libat_exchange_large_inplace (size_t n, void *mptr, void *vptr)
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11 {
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12 char temp[1024];
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13
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14 size_t i = 0;
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15
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16 for (i = 0; n >= 1024; i += 1024, n -= 1024)
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17 {
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18 memcpy (temp, mptr + i, 1024);
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19
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20 /* The memcpy call below results in the following:
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21 unsigned long ivtmp.7;
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22
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23 ivtmp.7_4 = (unsigned long) mptr_9(D);
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24 ...
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25 <bb 4>
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26 # ivtmp.7_22 = PHI <ivtmp.7_4(3), ivtmp.7_5(4)>
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27 ...
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28 _1 = (void *) ivtmp.7_22;
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29 ...
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30 memcpy (_1, _2, 1024);
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31
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32 Treating _1 as a pointer results in the bogus:
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33 warning: 'memcpy' offset 0 is out of the bounds [0, 8] of object 'ivtmp.7' with type 'long unsigned int' [-Warray-bounds]
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34 memcpy (mptr + i, vptr + i, 1024);
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35 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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36 */
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37 memcpy (mptr + i, vptr + i, 1024);
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38
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39 memcpy (vptr + i, temp, 1024);
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40 }
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41 }
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