Half-precision convert to 8-bit floating-point (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.
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| 0 | Q | 0 | 0 | 1 | 1 | 1 | 0 | 0 | 1 | 0 | Rm | 1 | 1 | 1 | 1 | 0 | 1 | Rn | Rd | ||||||||||||
| U | size | opcode | |||||||||||||||||||||||||||||
if !IsFeatureImplemented(FEAT_FP8) then EndOfDecode(Decode_UNDEF); end; let d : integer{} = UInt(Rd); let n : integer{} = UInt(Rn); let m : integer{} = UInt(Rm); let datasize : integer{} = if Q == '1' then 128 else 64; let elements : integer = datasize DIV 16;
| <Vd> |
Is the name of the SIMD&FP destination register, encoded in the "Rd" field. |
| <Ta> |
Is an arrangement specifier,
encoded in
|
| <Vn> |
Is the name of the first SIMD&FP source register, encoded in the "Rn" field. |
| <Tb> |
Is an arrangement specifier,
encoded in
|
| <Vm> |
Is the name of the second SIMD&FP source register, encoded in the "Rm" field. |
CheckFPMREnabled(); AArch64_CheckFPAdvSIMDEnabled(); let operand1 : bits(datasize) = V{}(n); let operand2 : bits(datasize) = V{}(m); var result : bits(datasize); for e = 0 to elements-1 do result[(0*elements + e)*:8] = FPConvertFP8{8, 16}(operand1[e*:16], FPCR(), FPMR()); result[(1*elements + e)*:8] = FPConvertFP8{8, 16}(operand2[e*:16], FPCR(), FPMR()); end; V{datasize}(d) = result;
2026-03_rel 2026-03-26 20:48:11
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