/* PR 15262.
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/* PR 15262.
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The alias analyzer only considers relations between pointers and
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The alias analyzer only considers relations between pointers and
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symbols. If two pointers P and Q point to the same symbol S, then
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symbols. If two pointers P and Q point to the same symbol S, then
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their respective memory tags will either be the same or they will
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their respective memory tags will either be the same or they will
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have S in their alias set.
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have S in their alias set.
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However, if there are no common symbols between P and Q, TBAA will
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However, if there are no common symbols between P and Q, TBAA will
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currently miss their alias relationship altogether. */
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currently miss their alias relationship altogether. */
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struct A
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struct A
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{
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{
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int t;
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int t;
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int i;
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int i;
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};
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};
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int foo () { return 3; }
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int foo () { return 3; }
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main ()
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main ()
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{
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{
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struct A loc, *locp;
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struct A loc, *locp;
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float f, g, *p;
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float f, g, *p;
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int T355, *T356;
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int T355, *T356;
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/* Avoid the partial hack in TBAA that would consider memory tags if
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/* Avoid the partial hack in TBAA that would consider memory tags if
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the program had no addressable symbols. */
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the program had no addressable symbols. */
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f = 3;
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f = 3;
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g = 2;
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g = 2;
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p = foo () ? &g : &f;
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p = foo () ? &g : &f;
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if (*p > 0.0)
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if (*p > 0.0)
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g = 1;
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g = 1;
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/* Store into *locp and cache its current value. */
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/* Store into *locp and cache its current value. */
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locp = malloc (sizeof (*locp));
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locp = malloc (sizeof (*locp));
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locp->i = 10;
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locp->i = 10;
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T355 = locp->i;
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T355 = locp->i;
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/* Take the address of one of locp's fields and write to it. */
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/* Take the address of one of locp's fields and write to it. */
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T356 = &locp->i;
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T356 = &locp->i;
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*T356 = 1;
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*T356 = 1;
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/* Read the recently stored value. If TBAA fails, this will appear
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/* Read the recently stored value. If TBAA fails, this will appear
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as a redundant load that will be replaced with '10'. */
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as a redundant load that will be replaced with '10'. */
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T355 = locp->i;
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T355 = locp->i;
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if (T355 != 1)
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if (T355 != 1)
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abort ();
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abort ();
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return 0;
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return 0;
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}
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}
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