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111
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1 /* Test volatile access to unaligned field. */
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2 /* { dg-do run } */
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3 /* { dg-options "-fstrict-volatile-bitfields" } */
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4
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5 extern void abort (void);
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6
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7 #define test_type unsigned short
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8 #define MAGIC (unsigned short)0x102u
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9
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10 typedef struct s{
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11 unsigned char Prefix;
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12 test_type Type;
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13 }__attribute((__packed__)) ss;
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14
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15 volatile ss v;
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16 ss g;
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17
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18 void __attribute__((noinline))
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19 foo (test_type u)
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20 {
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21 v.Type = u;
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22 }
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23
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24 test_type __attribute__((noinline))
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25 bar (void)
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26 {
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27 return v.Type;
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28 }
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29
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30 int main()
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31 {
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32 test_type temp;
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33 foo(MAGIC);
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34 __builtin_memcpy(&g, (void *)&v, sizeof(g));
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35 if (g.Type != MAGIC)
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36 abort ();
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37
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38 g.Type = MAGIC;
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39 __builtin_memcpy((void *)&v, &g, sizeof(v));
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40 temp = bar();
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41 if (temp != MAGIC)
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42 abort ();
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43 return 0;
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44 }
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