ARM Compiler armasm User Guide : 18.10 FCVT

18.10 FCVT

Floating-point Convert precision (scalar).

Syntax

FCVT Sd, Hn ; Half-precision to single-precision

FCVT Dd, Hn ; Half-precision to double-precision

FCVT Hd, Sn ; Single-precision to half-precision

FCVT Dd, Sn ; Single-precision to double-precision

FCVT Hd, Dn ; Double-precision to half-precision

FCVT Sd, Dn ; Double-precision to single-precision

Where:

Sd: Is the 32-bit name of the SIMD and FP destination register.
Hn: Is the 16-bit name of the SIMD and FP source register.
Dd: Is the 64-bit name of the SIMD and FP destination register.
Hd: Is the 16-bit name of the SIMD and FP destination register.
Sn: Is the 32-bit name of the SIMD and FP source register.
Dn: Is the 64-bit name of the SIMD and FP source register.

Operation

Floating-point Convert precision (scalar). This instruction converts the floating-point value in the SIMD and FP source register to the precision for the destination register data type using the rounding mode that is determined by the FPCR and writes the result to the SIMD and FP destination register.

Depending on the settings in the CPACR_EL1, CPTR_EL2, and CPTR_EL3 registers, and the current Security state and Exception level, an attempt to execute the instruction might be trapped.

Vd = convertFormat(Vn), where V is D, H, or S.

Related reference

18.1 A64 floating-point instructions in alphabetical order

Non-Confidential	PDF version	ARM 100069_0608_00_en
Copyright © 2014–2017 ARM Limited or its affiliates. All rights reserved.