Arm VERSION 1.2 Instrukcja Użytkownika Pobierz pdf (Strona 257)

100

101

Vector Floating-point Programming

6.7.3 FCMP

Floating-point compare.

FCMP

is always scalar.

Syntax

FCMP{E}<precision>{cond} Fd, Fm

FCMP{E}Z<precision>{cond} Fd

where:

is an optional parameter. If

is present, an exception is raised if either

operand is any kind of NaN. Otherwise, an exception is raised only if

either operand is a signalling NaN.

is a parameter specifying comparison with zero.

must be either

for single-precision, or

for double-precision.

cond

is an optional condition code (see VFP and condition codes on page 6-8).

is the VFP register holding the first operand.

is the VFP register holding the second operand. Omit

for a compare

with zero instruction.

The precision of

and

must match the precision specified in

Usage

The

FCMP

instruction subtracts the value in

from the value in

and sets the VFP

condition flags on the result (see VFP and condition codes on page 6-8).

Exceptions

FCMP

instructions can produce Invalid Operation exceptions.

Examples

FCMPS s3, s0

FCMPEDNE d5, d13

FCMPZSEQ s2

1 2 ... 252 253 254 255 256 257 258 259 260 261 262 ... 359 360

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