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[GR-71530] Add an implies rule for IntegerTest #12612

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Merged
graalvmbot merged 1 commit into from
Nov 28, 2025
Merged

[GR-71530] Add an implies rule for IntegerTest #12612

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13 changes: 12 additions & 1 deletion compiler/src/jdk.graal.compiler/src/jdk/graal/compiler/nodes/calc/IntegerTestNode.java
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
/*
* Copyright (c) 2011, 2024, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2011, 2025, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
Expand Down Expand Up @@ -140,4 +140,15 @@ public TriState tryFold(Stamp xStampGeneric, Stamp yStampGeneric) {
}
return TriState.UNKNOWN;
}

@Override
public TriState implies(boolean thisNegated, LogicNode other) {
if (thisNegated && other instanceof IntegerEqualsNode equals && equals.getY().isDefaultConstant() && equals.getX() instanceof AndNode and) {
/* this: (x & y) != 0, other: (a & b) == 0 */
if ((getX() == and.getX() && getY() == and.getY()) || (getX() == and.getY() && getY() == and.getX())) {
return TriState.FALSE;
}
}
return super.implies(thisNegated, other);
}
}