61 lines
879 B
C
61 lines
879 B
C
/* PR tree-optimization/33136 */
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/* { dg-do run } */
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/* { dg-options "-O2" } */
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extern void abort (void);
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struct S
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{
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void *a;
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int b;
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int *c;
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};
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static int d, e;
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static struct S s;
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static int *
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__attribute__((noinline, const))
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foo (void)
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{
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return &s.b;
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}
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int *
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__attribute__((noinline))
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bar (int **f)
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{
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s.c = &d;
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*f = &e;
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/* As nothing ever takes the address of any int * field in struct S,
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the write to *f can't alias with the s.c field. */
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return s.c;
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}
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int
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__attribute__((noinline))
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baz (int *x)
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{
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s.b = 1;
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*x = 4;
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/* Function foo takes address of an int field in struct S,
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so *x can alias with the s.b field (and it does in this testcase). */
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return s.b;
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}
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int
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__attribute__((noinline))
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t (void)
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{
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int *f = (int *) 0;
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return 10 * (bar (&f) != &d) + baz (foo ());
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}
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int
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main (void)
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{
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if (t () != 4)
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abort ();
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return 0;
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}
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