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Number of parameters: 2

Usage:
	signed_multiply_inplace <value0> <value1>

Effect:
	Performs the signed multiplication <value0>*<value1>, storing the integer result in <value0> and any overflowing bits into <value1>

Exceptions:
	None

Flags:
	Sets the overflow flag if <overflow>:<result> != <result>
	Carry flag is never set