FMOD

Operation

Computes the destination modulo the source using a quotient truncated toward zero.

Assembler Syntax

FMOD.{S|D}(z) <ea>(e), Fn(d)

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

Privilege

Unprivileged

Required CPUID flags

FP

Repeat eligibility

REP eligible

Computes the IEEE-style floating-point modulus defined by a quotient rounded toward zero and writes the selected-format remainder.

After DAZ processing, let \(x\) be the original destination and \(y\) the source. For finite valid operands, choose \(q\) as \(x/y\) truncated toward zero and compute $\(r = x - qy\)$ with exact intermediate arithmetic. A zero result has the sign of \(x\).

A signaling NaN generates NV; a NaN input produces the selected quiet NaN. Infinite \(x\) or zero \(y\) generates NV and produces the architectural default quiet NaN. Infinite \(y\) with finite \(x\) returns \(x\). An enabled floating-point exception condition raises the FLOATING_POINT_EXCEPTION architectural event before the destination write.

2.75in

Encodings

FMOD.{S|D}(z) <ea>(e), Fn(d)

Format: Instruction format for FMOD.{S|D}(z) <ea>(e), Fn(d)

2.75in FMOD.{S|D}(z) Fn(s), Fn(d)

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