sha/asm/sha*-mb-x86_64.pl: commentary update.

# naturally limited to 4 on pre-AVX2 processors and to 8 on

# AVX2-capable processors such as Haswell.

#

#		this	+aesni(*)	sha1	aesni-sha1	gain

#		this	+aesni(i)	sha1	aesni-sha1	gain(iv)

# -------------------------------------------------------------------

# Westmere(**)	10.4/n	+1.28=3.88(n=4)	5.44	6.58		+70%

# Atom(**)	18.9/n	+3.93=8.66(n=4)	10.0	14.0		+62%

# Westmere(ii)	10.4/n	+1.28=3.88(n=4)	5.44	6.58		+70%

# Atom(ii)	18.9/n	+3.93=8.66(n=4)	10.0	14.0		+62%

# Sandy Bridge	(8.16	+5.15=13.3)/n	4.99	5.98		+80%

# Ivy Bridge	(8.03	+5.14=13.2)/n	4.60	5.54		+68%

# Haswell(***)	(8.96	+5.00=14.0)/n	3.57	4.55		+160%

# Haswell(iii)	(8.96	+5.00=14.0)/n	3.57	4.55		+160%

# Bulldozer	(9.75	+5.76=15.5)/n	5.95	6.37		+64%

#

# (*)	multi-block CBC encrypt with 128-bit key;

# (**)	(HASH+AES)/n does not apply to Westmere for n>3 and Atom,

# (i)	multi-block CBC encrypt with 128-bit key;

# (ii)	(HASH+AES)/n does not apply to Westmere for n>3 and Atom,

#	because of lower AES-NI instruction throughput;

# (***)	"this" is for n=8, when we gather twice as much data, result

# (iii)	"this" is for n=8, when we gather twice as much data, result

#	for n=4 is 7.98+4.44=12.4;

# (iv)	improvement coefficients in real-life application are somewhat

#	lower and range from 30% to 100% (on Haswell);

$flavour = shift;

$output  = shift;

# naturally limited to 4 on pre-AVX2 processors and to 8 on

# AVX2-capable processors such as Haswell.

#

#		this	+aesni(*)	sha256	aesni-sha256	gain

#		this	+aesni(i)	sha256	aesni-sha256	gain(iv)

# -------------------------------------------------------------------

# Westmere(**)	23.3/n	+1.28=7.11(n=4)	12.3	+3.75=16.1	+126%

# Atom(**)	39.1/n	+3.93=13.7(n=4)	20.8	+5.69=26.5	+93%

# Westmere(ii)	23.3/n	+1.28=7.11(n=4)	12.3	+3.75=16.1	+126%

# Atom(ii)	39.1/n	+3.93=13.7(n=4)	20.8	+5.69=26.5	+93%

# Sandy Bridge	(20.5	+5.15=25.7)/n	11.6	13.0		+103%

# Ivy Bridge	(20.4	+5.14=25.5)/n	10.3	11.6		+82%

# Haswell(***)	(21.0	+5.00=26.0)/n	7.80	8.79		+170%

# Haswell(iii)	(21.0	+5.00=26.0)/n	7.80	8.79		+170%

# Bulldozer	(21.6	+5.76=27.4)/n	13.6	13.7		+100%

#

# (*)	multi-block CBC encrypt with 128-bit key;

# (**)	(HASH+AES)/n does not apply to Westmere for n>3 and Atom,

# (i)	multi-block CBC encrypt with 128-bit key;

# (ii)	(HASH+AES)/n does not apply to Westmere for n>3 and Atom,

#	because of lower AES-NI instruction throughput, nor is there

#	AES-NI-SHA256 stitch for these processors;

# (***)	"this" is for n=8, when we gather twice as much data, result

# (iii)	"this" is for n=8, when we gather twice as much data, result

#	for n=4 is 20.3+4.44=24.7;

# (iv)	improvement coefficients in real-life application are somewhat

#	lower and range from 75% to 130% (on Haswell);

$flavour = shift;

$output  = shift;