5.

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dup2_x2

duplicate two words and insert beneath fourth word

Jasmin Syntax

     dup2_x2 

Stack

Before	After
word1	word1
word2	word2
word3	word3
word4	word4
...	word1
	word2
	...

Description

Duplicates the top two-word item on the stack and inserts the duplicate before the previous (two-word) item on the stack. Alternatively, this instruction could be used to duplicate two single-word items and insert them before the before the third two-word (or fourth single-word) item on the stack.

Example

 bipush 100 bipush 200 dconst_0 ; stack now contains: ;     0.0 | double-word1 ;     0.0 | double-word2 ;     200   integer2-word1 ;     100   integer1-word1 dup2_x2 ; stack now contains: ;     0.0 | double-word1 ;     0.0 | double-word2 ;     200   integer2-word1 ;     100   integer1-word1 ;     0.0 | double-word1 ;     0.0 | double-word2 

Bytecode

Type	Description
u1	dup2_x2 opcode = 0x5E (94)

See Also

dup, dup2, dup_x1, dup2_x1

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Java Virtual Machine, by Jon Meyer and Troy Downing, O'Reilly Associates