..., word3, word2, word1
..., word2, word1, word3, word2, word1
| dup2_x1 |
Stack
..., word3, word2, word1 ..., word2, word1, word3, word2, word1
Description
The top two words on the operand stack are duplicated and the copies inserted, in the original order, three words down in the operand stack.
The dup2_x1 instruction must not be used unless each of word1 and word2 is a word that contains a 32-bit data type or both together are the two words that contain a single 64-bit datum, and unless word3 is a word that contains a 32-bit data type.
Notes
Except for restrictions preserving the integrity of 64-bit data types, the dup2_x1 instruction operates on untyped words, ignoring the types of the data they contain.
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Java Virtual Machine Specification (HTML generated by dkramer on February 25, 1997)
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