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ddf8910237
We can't remove a trivial phi of the form x = phi(x), because we don't have a replacement value. We could drop the whole block though. SCCP would normally do this, but in this particular case we only determine non-reachability based on type information. Fixes oss-fuzz #39316.
16 lines
314 B
PHP
16 lines
314 B
PHP
--TEST--
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Unreachable phi cycle
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--FILE--
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<?php
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// The inner loop is dead, but SCCP reachability analysis doesn't realize this,
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// as this is determined based on type information.
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function test() {
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for (; $i--;) {
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for(; x;);
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}
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}
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test();
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?>
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--EXPECTF--
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Warning: Undefined variable $i in %s on line %d
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