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Mojo function

has_neg_zero

def has_neg_zero[dtype: DType, width: Int](v: SIMD[dtype, width]) -> Bool

Returns True if any lane of v holds the -0.0 sentinel bit pattern.

This is the consumer-side readiness poll: a pack that still contains a sentinel lane has not been fully written by the producer. The any-lane reduction also defends against a torn read that leaves a single sentinel lane behind a partially-visible store.

Parameters:

dtype (DType): The transport float type. Must be bfloat16, float16, or float32.
width (Int): The SIMD pack width.

Args:

v (SIMD[dtype, width]): The pack to test.

Returns:

Bool: True if at least one lane equals the sentinel, False otherwise.