Function permlane16_u32 

pub unsafe extern "C" fn permlane16_u32(
    old: u32,
    src0: u32,
    src1: u32,
    src2: u32,
    fi: bool,
    bound_control: bool,
) -> u32

Performs arbitrary gather-style operation within a row (16 contiguous lanes) of the second input operand.

The third and fourth inputs must be uniform across the current wavefront. These are combined into a single 64-bit value representing lane selects used to swizzle within each row.