31 lines
757 B
C
31 lines
757 B
C
/* { dg-do compile } */
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/* { dg-do run } */
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/* { dg-options "-O2 -fpredictive-commoning -fdump-tree-pcom-details" } */
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/* Test for predictive commoning of expressions, with reassociation. */
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void abort (void);
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unsigned a[1000], b[1000], c[1000], d[1000];
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int main(void)
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{
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unsigned i;
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for (i = 0; i < 1000; i++)
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a[i] = b[i] = d[i] = i;
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for (i = 1; i < 998; i++)
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c[i] = d[i + 1] * a[i + 2] * b[i + 1] - b[i - 1] * a[i] * d[i - 1];
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for (i = 1; i < 998; i++)
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if (c[i] != (i+1)*(i+2)*(i+1) - (i - 1) * i * (i - 1))
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abort ();
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return 0;
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}
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/* { dg-final { scan-tree-dump-times "Combination" 2 "pcom"} } */
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/* { dg-final { scan-tree-dump-times "Unrolling 3 times." 1 "pcom"} } */
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/* { dg-final { cleanup-tree-dump "pcom" } } */
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