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8371528: C2: disable VerifyIterativeGVN Identity verification for ConvF2L etc #28212

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8371528: C2: disable VerifyIterativeGVN Identity verification for ConvF2L etc #28212

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12 changes: 12 additions & 0 deletions src/hotspot/share/opto/phaseX.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2007,6 +2007,18 @@ bool PhaseIterGVN::verify_Identity_for(Node* n) {
// Not investigated yet.
case Op_AbsI:
return false;

// Fuzzer failures reported in JDK-8371523, and possible variants,
// related to JDK-8369646.
// All of them have a coment like this:
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@JnRouvignac JnRouvignac Nov 10, 2025

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s/coment/comment/

// Remove ConvX2Y->ConvY2X->ConvX2Y sequences.
// It could make sense to expand the reproducers for other similar
// cases, just to ensure better coverage.
case Op_ConvD2L:
case Op_ConvF2I:
case Op_ConvF2L:
case Op_ConvI2F:
return false;
}

if (n->is_Load()) {
Expand Down