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[GR-71356] Fix blend(mask, allZeros, allOnes) canonicalization #12711

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Merged
graalvmbot merged 1 commit into from
Dec 14, 2025
+10 −8
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[GR-71356] Fix blend(mask, allZeros, allOnes) canonicalization #12711

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18 changes: 10 additions & 8 deletions ...k.graal.compiler/src/jdk/graal/compiler/vector/nodes/simd/SimdBlendWithLogicMaskNode.java
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Original file line number Diff line number Diff line change
Expand Up @@ -128,14 +128,16 @@ public Node canonical(CanonicalizerTool tool, ValueNode forX, ValueNode forY, Va
}
return SimdBlendWithLogicMaskNode.create(forY, forX, newSelector);
}
SimdStamp falseValuesStamp = (SimdStamp) forX.stamp(NodeView.from(tool));
SimdStamp trueValuesStamp = (SimdStamp) forY.stamp(NodeView.from(tool));
if (falseValuesStamp.isAllZeros() && trueValuesStamp.isAllOnes()) {
/*
* This is the vector equivalent of (condition ? true : false), we don't need to blend.
* The input mask is all we need.
*/
return forZ;
if (!SimdStamp.isOpmask(fromStamp)) {
SimdStamp falseValuesStamp = (SimdStamp) forX.stamp(NodeView.from(tool));
SimdStamp trueValuesStamp = (SimdStamp) forY.stamp(NodeView.from(tool));
if (falseValuesStamp.isAllZeros() && trueValuesStamp.isAllOnes()) {
/*
* This is the vector equivalent of (condition ? true : false), we don't need to
* blend. The input mask is all we need.
*/
return forZ;
}
}

return this;
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