[9] RFR (S): 8152773: C2: LoadNode properties aren't preserved when converting between signed/unsigned variants

Vladimir Kozlov vladimir.kozlov at oracle.com
Fri Mar 25 18:04:16 UTC 2016

assert(false, "no unsigned variant"); should print name of node.

Why convert_to_signed_load() does not do the same checks as convert_to_unsigned_load()?


On 3/25/16 10:38 AM, Vladimir Ivanov wrote:
> http://cr.openjdk.java.net/~vlivanov/8152773/webrev.00/
> https://bugs.openjdk.java.net/browse/JDK-8152773
> AndINode::Ideal() converts signed loads to unsigned for some masks. But it constructs fresh nodes and doesn't copy
> LoadNode properties from the node being replaced. It means that operations marked as pinned, mismatched or unaligned
> will not be treated as such anymore.
> The problem was found by compiler/unsafe/UnsafeGetStableArrayElement.
> Testing: failing test, JPRT (in progress), RBT (in progress).
> Best regards,
> Vladimir Ivanov

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