dup

dup

Forms
dup = 89 (0x59)

Stack
..., word ..., word, word

Description
The top word on the operand stack is duplicated and pushed onto the operand stack.

The dup instruction must not be used unless word contains a 32-bit data type.

Notes
Except for restrictions preserving the integrity of 64-bit data types, the dup instruction operates on an untyped word, ignoring the type of the datum it contains.

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Java Virtual Machine Specification (HTML generated by dkramer on February 25, 1997)
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