46 lines
762 B
C
46 lines
762 B
C
/* Test volatile access to unaligned field. */
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/* { dg-do run } */
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/* { dg-require-effective-target size32plus } */
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/* { dg-options "-fstrict-volatile-bitfields" } */
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extern void abort (void);
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#define test_type unsigned int
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#define MAGIC 0x1020304u
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typedef struct s{
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unsigned char Prefix;
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test_type Type;
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}__attribute((__packed__)) ss;
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volatile ss v;
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ss g;
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void __attribute__((noinline))
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foo (test_type u)
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{
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v.Type = u;
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}
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test_type __attribute__((noinline))
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bar (void)
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{
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return v.Type;
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}
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int main()
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{
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test_type temp;
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foo(MAGIC);
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__builtin_memcpy(&g, (void *)&v, sizeof(g));
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if (g.Type != MAGIC)
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abort ();
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g.Type = MAGIC;
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__builtin_memcpy((void *)&v, &g, sizeof(v));
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temp = bar();
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if (temp != MAGIC)
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abort ();
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return 0;
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}
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