unop

Purpose

Perform the identified unary operation on the source register, storing the result in the destination register.

Details

Op & Format	Mnemonic / Syntax	Arguments
7b..8f 12x	unop vA, vB 7b: neg-int 7c: not-int 7d: neg-long 7e: not-long 7f: neg-float 80: neg-double 81: int-to-long 82: int-to-float 83: int-to-double 84: long-to-int 85: long-to-float 86: long-to-double 87: float-to-int 88: float-to-long 89: float-to-double 8a: double-to-int 8b: double-to-long 8c: double-to-float 8d: int-to-byte 8e: int-to-char 8f: int-to-short	`A:` destination register or pair (4 bits) `B:` source register or pair (4 bits)

Constraints

Both A and B must be valid register indices for the current stackframe.
If the input type of <unop> is double or long, also B+1 must be a valid register index in the current stackframe.
If the output type of <unop> is double or long, also A+1 must be a valid register index in the current stackframe.
The type of register vB must match the source type of the instruction (this probably needs more detail).

Behavior

The given operation <unop> is performed according to the semantics specified in table XXX.
The result is stored in register vA, that is, vA'=<unop> vB.
It gets a bit messy if we want to describe all the combinations of input and output with and without pairs here. Probably it's better to split it up.

Exceptions

ArithmeticException if an arithmetic error occurs during the instruction.