# Function core::arch::x86::_mm_extract_si64 [−] [src]

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

🔬 This is a nightly-only experimental API. (`stdsimd` #48556)
This is supported on x86 and target feature `sse4a` only.

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 `lenght + index > 64` the result is undefined.

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