Commentary update motivating code update in 0.9.7.

# achieves respectful 432MBps on 2.8GHz processor now. For reference.

# If executed on Xeon, current RC4_CHAR code-path is 2.7x faster than

# RC4_INT code-path. While if executed on Opteron, it's only 25%

# slower slower than the RC4_INT one [meaning that if detecting CPU

# is not desired, then RC4_CHAR code-path should be preferred, as it

# provides better *all-round* performance].

# slower than the RC4_INT one [meaning that if CPU -arch detection

# is not implemented, then this final RC4_CHAR code-path should be

# preferred, as it provides better *all-round* performance].

$output=shift;

open STDOUT,"| $^X ../perlasm/x86_64-xlate.pl $output";

	add	$TX[0]#b,$YY#b

	lea	1($XX[0]),$XX[1]

	movzb	($dat,$YY),$TY#d

	movzb	$XX[1]#b,$XX[1]

	movzb	$XX[1]#b,$XX[1]#d

	movzb	($dat,$XX[1]),$TX[1]#d

	movb	$TX[0]#b,($dat,$YY)

	cmp	$XX[1],$YY