# Function core::arch::x86_64::_mm_extract_si64

1.27.0 · source ·

    pub unsafe fn _mm_extract_si64(x: __m128i, y: __m128i) -> __m128i

Available on (x86 or x86-64) and target feature `sse4a` and x86-64 only.
Expand description

Extracts the bit range specified by `y` from the lower 64 bits of `x`.

The `[13:8]` bits of `y` specify the index of the bit-range to extract. The `[5:0]` bits of `y` specify the length of the bit-range to extract. All other bits are ignored.

If the length is zero, it is interpreted as `64`. If the length and index are zero, the lower 64 bits of `x` are extracted.

If `length == 0 && index > 0` or `length + index > 64` the result is undefined.