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VRINTA (floating-point)

Round floating-point to integer to Nearest with Ties to Away rounds a floating-point value to an integral floating-point value of the same size using the Round to Nearest with Ties to Away rounding mode. A zero input gives a zero result with the same sign, an infinite input gives an infinite result with the same sign, and a NaN is propagated as for normal arithmetic.

It has encodings from the following instruction sets: A32 ( A1 ) and T32 ( T1 ) .

A1

313029282726252423222120191817161514131211109876543210
111111101D111000Vd10!= 0001M0Vm
RMsize

Half-precision scalar (size == 01)
(Armv8.2)

VRINTA{<q>}.F16 <Sd>, <Sm>

Single-precision scalar (size == 10)

VRINTA{<q>}.F32 <Sd>, <Sm>

Double-precision scalar (size == 11)

VRINTA{<q>}.F64 <Dd>, <Dm>

if size == '00' || (size == '01' && !HaveFP16Ext()) then UNDEFINED;
rounding = FPDecodeRM(RM);  exact = FALSE;
case size of
    when '01' esize = 16; d = UInt(Vd:D); m = UInt(Vm:M);
    when '10' esize = 32; d = UInt(Vd:D); m = UInt(Vm:M);
    when '11' esize = 64; d = UInt(D:Vd); m = UInt(M:Vm);

T1

15141312111098765432101514131211109876543210
111111101D111000Vd10!= 0001M0Vm
RMsize

Half-precision scalar (size == 01)
(Armv8.2)

VRINTA{<q>}.F16 <Sd>, <Sm>

Single-precision scalar (size == 10)

VRINTA{<q>}.F32 <Sd>, <Sm>

Double-precision scalar (size == 11)

VRINTA{<q>}.F64 <Dd>, <Dm>

if InITBlock() then UNPREDICTABLE;
if size == '00' || (size == '01' && !HaveFP16Ext()) then UNDEFINED;
rounding = FPDecodeRM(RM);  exact = FALSE;
case size of
    when '01' esize = 16; d = UInt(Vd:D); m = UInt(Vm:M);
    when '10' esize = 32; d = UInt(Vd:D); m = UInt(Vm:M);
    when '11' esize = 64; d = UInt(D:Vd); m = UInt(M:Vm);

CONSTRAINED UNPREDICTABLE behavior

If InITBlock(), then one of the following behaviors must occur:

  • The instruction is undefined.
  • The instruction executes as if it passes the Condition code check.
  • The instruction executes as NOP. This means it behaves as if it fails the Condition code check.

For more information about the constrained unpredictable behavior of this instruction, see Architectural Constraints on UNPREDICTABLE behaviors.

Assembler Symbols

<q>

See Standard assembler syntax fields.

<Sd>

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

<Sm>

Is the 32-bit name of the SIMD&FP source register, encoded in the "Vm:M" field.

<Dd>

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

<Dm>

Is the 64-bit name of the SIMD&FP source register, encoded in the "M:Vm" field.

Operation

EncodingSpecificOperations(); CheckVFPEnabled(TRUE);
case esize of
    when 16
        S[d] = Zeros(16) : FPRoundInt(S[m]<15:0>, FPSCR, rounding, exact);
    when 32
        S[d] = FPRoundInt(S[m], FPSCR, rounding, exact);
    when 64
        D[d] = FPRoundInt(D[m], FPSCR, rounding, exact);