SQRDMLAH (vector)

Signed saturating rounding doubling multiply accumulate returning high half (vector)

This instruction multiplies the vector elements of the first source SIMD&FP register with the corresponding vector elements of the second source SIMD&FP register without saturating the multiply results, doubles the results, and accumulates the most significant half of the final results with the vector elements of the destination SIMD&FP register. The results are rounded.

If any of the results overflow, they are saturated. The cumulative saturation bit, FPSR.QC, is set if saturation occurs.

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.

It has encodings from 2 classes: Scalar and Vector

Scalar
(FEAT_RDM)

Decode for this encoding

if !IsFeatureImplemented(FEAT_RDM) then EndOfDecode(Decode_UNDEF); end; if size == '11' || size == '00' then EndOfDecode(Decode_UNDEF); end; let d : integer{} = UInt(Rd); let n : integer{} = UInt(Rn); let m : integer{} = UInt(Rm); let esize : integer{} = 8 << UInt(size); let datasize : integer{} = esize; let elements : integer = 1; let rounding : boolean = TRUE;

Vector
(FEAT_RDM)

Decode for this encoding

if !IsFeatureImplemented(FEAT_RDM) then EndOfDecode(Decode_UNDEF); end; if size == '11' || size == '00' then EndOfDecode(Decode_UNDEF); end; let d : integer{} = UInt(Rd); let n : integer{} = UInt(Rn); let m : integer{} = UInt(Rm); let esize : integer{} = 8 << UInt(size); let datasize : integer{} = 64 << UInt(Q); let elements : integer = datasize DIV esize; let rounding : boolean = TRUE;