FCVTN (half-precision to 8-bit floating-point)
Half-precision to 8-bit floating-point convert and narrow (vector)
This instruction converts half-precision elements of the two
source vectors to 8-bit floating-point while scaling the values by
2SInt(FPMR.NSCALE[4:0]), and places the in-order results in the
8-bit elements of the destination vector.
The 8-bit floating-point encoding format is selected by
FPMR.F8D.
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FCVTN <Vd>.<Ta>, <Vn>.<Tb>, <Vm>.<Tb>
if !IsFeatureImplemented(FEAT_FP8) then UNDEFINED;
constant integer d = UInt(Rd);
constant integer n = UInt(Rn);
constant integer m = UInt(Rm);
constant integer datasize = if Q == '1' then 128 else 64;
constant integer elements = datasize DIV 16;
<Vd>
Is the name of the SIMD&FP destination register, encoded in the "Rd" field.
<Ta>
Is an arrangement specifier,
<Vn>
Is the name of the first SIMD&FP source register, encoded in the "Rn" field.
<Tb>
Is an arrangement specifier,
<Vm>
Is the name of the second SIMD&FP source register, encoded in the "Rm" field.
CheckFPMREnabled(); CheckFPAdvSIMDEnabled64();
constant bits(datasize) operand1 = V[n, datasize];
constant bits(datasize) operand2 = V[m, datasize];
bits(datasize) result;
for e = 0 to elements-1
Elem[result, 0*elements + e, 8] = FPConvertFP8(Elem[operand1, e, 16], FPCR, FPMR, 8);
Elem[result, 1*elements + e, 8] = FPConvertFP8(Elem[operand2, e, 16], FPCR, FPMR, 8);
V[d, datasize] = result;