FilterFactory - Operator "!" (logical "not")

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Syntax

!a

Original Machine Code (in OPER resource) of Filter Factory 3.0 and 3.0.4 for Photoshop/Win32

58	pop eax (param_a)	.
83 F8 01	cmp eax,$01 (1)	param_a == 1 ?
1B C0	sbb eax,eax	eax -= (param_a == 1 ? 1 : 0) (???)
F7 D8	neg eax	eax = -eax;
50	push eax	return eax;