rc4-586.pl: add Atom performance results.

# May 2011

# May 2011

#

#

# Optimize for Core2 and Westmere [and incidentally Opteron]. Current

# Optimize for Core2 and Westmere [and incidentally Opteron]. Current

# performance in cycles per processed byte (less is better) is:

# performance in cycles per processed byte (less is better) and

# improvement relative to previous version of this module is:

#

#

# Pentium	10.2			# original numbers

# Pentium	10.2			# original numbers

# Pentium III	7.8(*)

# Pentium III	7.8(*)

# Core2		5.3/+67%(**)

# Core2		5.3/+67%(**)

# Westmere	5.1/+94%(**)

# Westmere	5.1/+94%(**)

# Sandy Bridge	5.0/+8%

# Sandy Bridge	5.0/+8%

# Atom		12.6/+6%

#

#

# (*)	PIII can actually deliver 6.6 cycles per byte with MMX code,

# (*)	PIII can actually deliver 6.6 cycles per byte with MMX code,

#	but this specific code performs poorly on Core2. And vice

#	but this specific code performs poorly on Core2. And vice