4.

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dup2_x1

duplicate two words and insert beneath third word

Jasmin Syntax

     dup2_x1 

Stack

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

Description

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

Example

 bipush 100 dconst_0 ; stack now contains: ;     0.0 | double-word1 ;     0.0 | double-word2 ;     100   integer-word1 dup2_x1 ; stack now contains: ;     0.0 | double-word1 ;     0.0 | double-word2 ;     100   integer-word1 ;     0.0 | double-word1 ;     0.0 | double-word2 

Bytecode

Type	Description
u1	dup2_x1 = 0x5D (93)

See Also

dup, dup2, dup_x1, dup2_x2

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