34 lines
841 B
C
34 lines
841 B
C
/* { dg-do run } */
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/* { dg-require-alias "" } */
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/* { dg-options "-O -fdump-tree-fre1" } */
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extern void abort (void);
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struct X { int a[128]; };
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static const struct X a = { 0, 1, 2, 3 };
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/* Prevent gimplify_modify_expr_rhs / gimplify_init_constructor from
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expanding the aggregate copy below inline. */
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static const struct X A __attribute__((alias("a")));
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struct X *q;
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int __attribute__((noinline))
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foo ()
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{
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struct X b = A;
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int *p = &b.a[2];
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/* Prevent SRA from decomposing b. */
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q = &b;
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return *p;
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}
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int main()
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{
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if (foo() != 2)
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abort ();
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return 0;
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}
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/* Verify the aggregate copy we want to look through is still in place. */
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/* { dg-final { scan-tree-dump "b = A;" "fre1" } } */
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/* Verify we have propagated the element read all the way to the return. */
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/* { dg-final { scan-tree-dump "return 2" "fre1" } } */
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