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tree-optimization/105368 - avoid overflow in powi_cost

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The following avoids undefined signed overflow when computing
the absolute of the exponent in powi_cost.

2022-04-25  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/105368
	* tree-ssa-math-opts.cc (powi_cost): Use absu_hwi.
This commit is contained in:
Richard Biener 2022-04-25 10:55:21 +02:00
parent ab91c10792
commit f0e170f72f
1 changed files with 1 additions and 1 deletions
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gcc/tree-ssa-math-opts.cc
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@ -1462,7 +1462,7 @@ powi_cost (HOST_WIDE_INT n)
return 0;
/* Ignore the reciprocal when calculating the cost. */
val = (n < 0) ? -n : n;
val = absu_hwi (n);
/* Initialize the exponent cache. */
memset (cache, 0, POWI_TABLE_SIZE * sizeof (bool));