| Parameter | Description |
|---|---|
| a0 | 64-bit vector a0 |
| a1 | 128-bit vector a1 |
v128 128-bit vector
Floating-point Convert to lower precision Narrow (vector). This instruction reads each vector element in the SIMD&FP source register, converts each result to half the precision of the source element, writes the final result to a vector, and writes the vector to the lower or upper half of the destination SIMD&FP register. The destination vector elements are half as long as the source vector elements. The rounding mode is determined by the FPCR.
Equivalent instruction: FCVTN2 Vd.4S,Vn.2D