Unsigned and signed 8-bit integer matrix multiply-accumulate. This instruction multiplies the 2x8 matrix of unsigned 8-bit integer values in the first source vector by the 8x2 matrix of signed 8-bit integer values in the second source vector. The resulting 2x2 32-bit integer matrix product is destructively added to the 32-bit integer matrix accumulator in the destination vector. This is equivalent to performing an 8-way dot product per destination element.
From Armv8.2 to Armv8.5, this is an optional instruction. From Armv8.6 it is mandatory for implementations that include Advanced SIMD to support it. ID_AA64ISAR1_EL1.I8MM indicates whether this instruction is supported.
if !HaveInt8MatMulExt() then UNDEFINED; integer n = UInt(Rn); integer m = UInt(Rm); integer d = UInt(Rd);
Is the name of the SIMD&FP third source and destination register, encoded in the "Rd" field.
Is the name of the first SIMD&FP source register, encoded in the "Rn" field.
Is the name of the second SIMD&FP source register, encoded in the "Rm" field.