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Mojo function

sum

def sum(val: SIMD) -> Scalar[val.dtype]

Computes the sum of values across all lanes in a warp.

This is a convenience wrapper around lane_group_sum that operates on the entire warp. It performs a parallel reduction using warp shuffle operations to find the global sum across all lanes in the warp.

Args:

• ​val (SIMD): The SIMD value to reduce. Each lane contributes its value to the sum.

Returns:

Scalar[val.dtype]: The scalar sum of values across all lanes in the warp.