SCVTF (scalar, integer)

Signed integer Convert to Floating-point (scalar). This instruction converts the signed integer value in the general-purpose source register to a floating-point value using the rounding mode that is specified by the FPCR, and writes the result to the SIMD&FP destination register.

A floating-point exception can be generated by this instruction. Depending on the settings in FPCR, the exception results in either a flag being set in FPSR, or a synchronous exception being generated. For more information, see Floating-point exception traps.

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.

313029282726252423222120191817161514131211109876543210
sf0011110ftype100010000000RnRd
Srmodeopcode

32-bit to half-precision (sf == 0 && ftype == 11)
(FEAT_FP16)

SCVTF <Hd>, <Wn>

32-bit to single-precision (sf == 0 && ftype == 00)

SCVTF <Sd>, <Wn>

32-bit to double-precision (sf == 0 && ftype == 01)

SCVTF <Dd>, <Wn>

64-bit to half-precision (sf == 1 && ftype == 11)
(FEAT_FP16)

SCVTF <Hd>, <Xn>

64-bit to single-precision (sf == 1 && ftype == 00)

SCVTF <Sd>, <Xn>

64-bit to double-precision (sf == 1 && ftype == 01)

SCVTF <Dd>, <Xn>

if ftype == '10' then UNDEFINED; if ftype == '11' && !IsFeatureImplemented(FEAT_FP16) then UNDEFINED; integer d = UInt(Rd); integer n = UInt(Rn); constant integer intsize = 32 << UInt(sf); constant integer decode_fltsize = if ftype == '10' then 64 else (8 << UInt(ftype EOR '10')); FPRounding rounding; rounding = FPRoundingMode(FPCR);

Assembler Symbols

<Hd>

Is the 16-bit name of the SIMD&FP destination register, encoded in the "Rd" field.

<Wn>

Is the 32-bit name of the general-purpose source register, encoded in the "Rn" field.

<Sd>

Is the 32-bit name of the SIMD&FP destination register, encoded in the "Rd" field.

<Dd>

Is the 64-bit name of the SIMD&FP destination register, encoded in the "Rd" field.

<Xn>

Is the 64-bit name of the general-purpose source register, encoded in the "Rn" field.

Operation

CheckFPEnabled64(); constant boolean merge = IsMerging(FPCR); constant integer fltsize = if merge then 128 else decode_fltsize; bits(fltsize) fltval; bits(intsize) intval; intval = X[n, intsize]; fltval = if merge then V[d, fltsize] else Zeros(fltsize); Elem[fltval, 0, decode_fltsize] = FixedToFP(intval, 0, FALSE, FPCR, rounding, decode_fltsize); V[d, fltsize] = fltval;


Internal version only: aarchmrs v2023-12_rel, pseudocode v2023-12_rel, sve v2023-12_rel ; Build timestamp: 2023-12-15T16:46

Copyright © 2010-2023 Arm Limited or its affiliates. All rights reserved. This document is Non-Confidential.