+20% performance improvement of P4-specific RC4_CHAR loop.

	&lea	($ty,&DWP(0,$in,$ty));

	&mov	(&swtmp(2),$ty);

	&movz	($tx,&BP(0,$d,$x));

	# strangely enough unrolled loop performs over 20% slower...

	&set_label("RC4_CHAR_loop");

		&movz	($tx,&BP(0,$d,$x));

		&add	(&LB($y),&LB($tx));

		&movz	($ty,&BP(0,$d,$y));

		&movb	(&BP(0,$d,$y),&LB($tx));

		&movb	(&BP(0,$d,$x),&LB($ty));

		&add	(&LB($ty),&LB($tx));

		&movz	($ty,&BP(0,$d,$ty));

		&add	(&LB($x),1);

		&xorb	(&LB($ty),&BP(0,$in));

		&movb	(&BP(0,$out),&LB($ty));

		&inc	(&LB($x));

		&inc	($in);

		&inc	($out);

		&lea	($in,&BP(1,$in));

		&movz	($tx,&BP(0,$d,$x));

		&cmp	($in,&swtmp(2));

		&movb	(&BP(0,$out),&LB($ty));

		&lea	($out,&BP(1,$out));

	&jb	(&label("RC4_CHAR_loop"));

	&set_label("finished");