# [−][src]Function core::arch::x86::_mm_maskmove_si64

    pub unsafe fn _mm_maskmove_si64(a: __m64, mask: __m64, mem_addr: *mut i8)

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

Conditionally copies the values from each 8-bit element in the first 64-bit integer vector operand to the specified memory location, as specified by the most significant bit in the corresponding element in the second 64-bit integer vector operand.

To minimize caching, the data is flagged as non-temporal (unlikely to be used again soon).