Fix Tree Simplifier convertCurrentTimeMillis() #18312
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The convertCurrentTimeMillis() function was recreating a currentTimeMillis() call into a new call target which would be replaced in codegen with a Z specific instruction. To convert the results into milliseconds the value has to be divided by a constant and the tree was incorrectly converted into an ldiv with a call child that is not anchored which allowed dead trees elimination to remove the treetop resulting in the the ldiv to be moved in a way that would change the semantic of the java method. Signed-off-by: Kevin Langman <langman@ca.ibm.com>
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Jenkins test sanity all jdk11 |
vijaysun-omr
approved these changes
Oct 19, 2023
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@vijaysun-omr the machines at unb aren't usable atm, see the announcement on Slack |
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jenkins test sanity zlinuxjit jdk21 |
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Checks have passed except on aix that does not look like a real issue. This is a cross platform change anyway that looks safe to me. Merging. |
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The convertCurrentTimeMillis() function was recreating a currentTimeMillis() call into a new call target which would be replaced in codegen with a Z specific instruction. To convert the results into milliseconds the value has to be divided by a constant and the tree was incorrectly converted into an ldiv with a call child that is not anchored which allowed dead trees elimination to remove the treetop resulting in the the ldiv to be moved in a way that would change the semantic of the java method.