dup_x1 : duplicate top stack word and insert beneath second word : index : visitInsn()

Description

Duplicates the top item on the stack and inserts the duplicate below the second-from-top item. Both items must be single-word items.

Notes

This instruction cannot be used if either of item1 or item2 are two-word items. To duplicate a two-word item (a long or a double) you must use dup2, dup2_x1 or dup2_x2.

See also

dup dup2 dup2_x1 dup2_x2

Stack

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

Bytecode

Type	Description
u1	dup_x1 = 0x5A (90)