dup_x2 : duplicate top stack word and insert beneath third word : index : visitInsn()

Description

Duplicates the top single-word stack item inserts the duplicate three words down.

Example

dconst_0
bipush 100
; stack now contains:
;     0.0 | double-word1
;     0.0 | double-word2
;     100   integer
dup_x2
; stack now contains:
;     100   integer1
;     0.0 | double-word1
;     0.0 | double-word2
;     100   integer1

Notes

This instruction cannot be used if the top item on the stack is a two-word item (i.e. a long or a double-precision float). Use dup2, dup2_x1 or dup2_x2 instead.

See also

dup dup2 dup_x1 dup2_x2

Stack

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

Bytecode

Type	Description
u1	dup_x2 = 0x5B (91)