Arm VERSION 1.2 Manual de usuario descargar pdf (Pagina 271)

100

101

Vector Floating-point Programming

6.7.14 FMRX, FMXR, and FMSTAT

Transfer contents between an ARM register and a VFP system register.

Syntax

FMRX{cond} Rd, VFPsysreg

FMXR{cond} VFPsysreg, Rd

FMSTAT{cond}

where:

cond

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

VFPsysreg

is the VFP system register, usually

FPSCR

FPSID

, or

FPEXC

(see

Floating-point registers on page 6-5).

is the ARM register.

Usage

The

FMRX

instruction transfers the contents of

VFPsysreg

into

The

FMXR

instruction transfers the contents of

into

VFPsysreg

The

FMSTAT

instruction is a synonym for

FMRX r15, FPSCR

. It transfers the floating-point

condition flags to the corresponding flags in the ARM CPSR (see VFP and condition

codes on page 6-8).

Note

These instructions stall the ARM until all current VFP operations complete.

Exceptions

These instructions do not produce any exceptions.

Examples

FMSTAT

FMSTATNE

FMXR FPSCR, r2

FMRX r3, FPSID

1 2 ... 266 267 268 269 270 271 272 273 274 275 276 ... 359 360

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Arm VERSION 1.2 Manual de usuario Pagina 271

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