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Commit 7ea501d3 authored by Andrew Pinski's avatar Andrew Pinski
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MATCH: Make zero_one_valued_p non-recursive fully

So it turns out VN can't handle any kind of recursion for match. In this
case we have `b = a & -1` and we try to match a as being zero_one_valued_p
and VN returns b as being the value and we just go into an infinite loop at
this point.

OK? Bootstrapped and tested on x86_64-linux-gnu with no regressions.

Note genmatch should warn (or error out) if this gets detected so I filed PR 111446
which I will be looking into next week or the week after so we don't run into
this issue again.

	PR tree-optimization/111442

gcc/ChangeLog:

	* match.pd (zero_one_valued_p): Have the bit_and match not be
	recursive.

gcc/testsuite/ChangeLog:

	* gcc.c-torture/compile/pr111442-1.c: New test.
parent 951d3c19
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