[ http://issues.apache.org/jira/browse/DERBY-921?page=all ]
Daniel John Debrunner updated DERBY-921:
----------------------------------------
Description:
Conditionals in generated code (MethodBuilder.conditionalIf and
conditionalIfNull) generate code that only supports 16 bit jump offsets for the
branch opcode (e.g. IFNONNULL) or the GOTO opcode. Earlier code now detects
the offset being larger than 32767.
The JVM supports a 32bit jump offset instruction, GOTO_W, this can be used to
support jump offsets that are bigger than 16bits (32767) for both the branch
opcode
and the GOTO instruction.
This allow increasing the number of logical operators as seen in the query in
the largeCodeGen test.
was:
Conditionals in generated code (MethodBuilder.conditionalIf and
conditionalIfNull) generate code that only supports 16 bit jump offsets for the
branch opcode (e.g. IFNONNULL) or the GOTO opcode. Earlier code now detects
the offset being larger than 32767.
The JVM supports a 32bit jump offset instruction, GOTO_W, this can be used to
support jump offsets that are bigger than 16bits (32767) for both the branch
opcode
and the GOTO instruction.
This allow increasing the number of IN list values as seen in the query in the
largeCodeGen test.
Spaced out on which query this was helping in large code gen.
> Support 32bit branch offsets for conditional logic in generated code.
> ---------------------------------------------------------------------
>
> Key: DERBY-921
> URL: http://issues.apache.org/jira/browse/DERBY-921
> Project: Derby
> Type: Sub-task
> Components: Services, SQL
> Reporter: Daniel John Debrunner
> Assignee: Daniel John Debrunner
> Priority: Minor
> Fix For: 10.2.0.0
>
> Conditionals in generated code (MethodBuilder.conditionalIf and
> conditionalIfNull) generate code that only supports 16 bit jump offsets for
> the branch opcode (e.g. IFNONNULL) or the GOTO opcode. Earlier code now
> detects the offset being larger than 32767.
> The JVM supports a 32bit jump offset instruction, GOTO_W, this can be used to
> support jump offsets that are bigger than 16bits (32767) for both the branch
> opcode
> and the GOTO instruction.
> This allow increasing the number of logical operators as seen in the query in
> the largeCodeGen test.
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