Available on x86 and target feature
sse4.1
only.Expand description
Multiplies the packed 32-bit integers in a
and b
, producing intermediate
64-bit integers, and returns the lowest 32-bit, whatever they might be,
reinterpreted as a signed integer. While pmulld __m128i::splat(2), __m128i::splat(2)
returns the obvious __m128i::splat(4)
, due to wrapping
arithmetic pmulld __m128i::splat(i32::MAX), __m128i::splat(2)
would
return a negative number.