Cosh

Function Cosh

The Cosh function computes a hyperbolic cosine.

Performance:

	Default processor	Pentium® III processor	Pentium® 4 processor	Itanium® processor
vsCosh (HA version)	51.2	35.9	20.5	7.2
vdCosh (HA version)	72.0	72.0	36.9	10.4

Notes:
1) Units - CPE (Clocks per Element)
2) Performance was measured on "working" interval (double precision: [-707,707]; single precision: [-87,87])
3) Data - vectors of 1000 elements with random generated numbers
4) "Default" means X87 code for all IA-32 processors
5) Performance of "default" version was measured on Pentium® III processor

Notes:
1) *        X87 code for all processors
2) **      Pentium® III processor
3) ***    Pentium® 4 processor
4) **** Itanium® processor
5) Logarithmic scale is used for "Vectors Size" axis

Maximal observed error for the whole function domain:

	Default processor	Pentium® III processor	Pentium® 4 processor	Itanium® processor
vsCosh (HA version)	0.50	0.61	0.75	0.50
vdCosh (HA version)	0.81	0.81	0.76	0.50

Notes:
1) Units - ULP (Units in The Last Place)

Special values:

Function	Input Argument	Result	Default processor	Pentium® III processor	Pentium® 4 processor	Itanium® processor
vsCosh/vdCosh (HA version)	0	1	+	+	+	+
	NaN (Both QnaN and SNaN)	NaN	+	+	+	+
	+ Inf	Inf	+	+	+	+
	- Inf	Inf	+	+	+	+
	x> Precision`s Overflow Threshold	+ Inf (Raise Owerflow Exeption)	+	+	+	+
	x< Negative Overflow Threshold	+ Inf (Raise Owerflow Exeption)	+	+	+	+

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