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i2b

convert integer to byte

Jasmin Syntax

     i2b 

Stack

Before	After
value	result
...	...

Description

Converts an integer to a signed byte. A 32-bit int is popped off the stack, the top 24 bits are discarded (they are set to zero), then the resulting value is signed extended to an int. The int result is pushed back onto the stack.

i2b is used in Java where there is a cast between an int and a byte. Notice that i2b can cause a change in sign. For example, in the code:

     int x = -134;     byte b = (byte)x; 

The value of b is positive 122 - the sign bit of x is lost in the conversion.

Bytecode

Type	Description
u1	i2b opcode = 0x91 (145)

See Also

i2c, i2s

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