FCOSHA

Operation

Approximates hyperbolic cosine for finite values and signed infinity.

Assembler Syntax

FCOSHA.{S|D}(z) Fn(s), Fn(d)

Privilege

Unprivileged

Required CPUID flags

FP

FPTRANSA

Repeat eligibility

REP eligible

Computes the cosh(x) reference over all finite values and signed infinity after DAZ and writes an implementation-bounded S- or D-format approximation under the selected FPTRANSA accuracy contract.

The required FPTRANSA_ACCURACY contract is 0x0022.

Special values

• Infinite source: the result is +infinity.

• Zero source: the result is positive one.

Exact anchors

• cosh(+0) = +1

• cosh(-0) = +1

• cosh(infinity) = +infinity

Required properties

• even

• nonincreasing below zero and nondecreasing above zero

• result is at least 1

2.75in

Encodings

FCOSHA.{S|D}(z) Fn(s), Fn(d)

Format: Instruction format for FCOSHA.{S|D}(z) Fn(s), Fn(d)