Function core::arch::x86_64::_mm_shuffle_epi8
1.27.0 · source · pub unsafe fn _mm_shuffle_epi8(a: __m128i, b: __m128i) -> __m128i
Available on (x86 or x86-64) and target feature
ssse3
and x86-64 only.Expand description
Shuffles bytes from a
according to the content of b
.
The last 4 bits of each byte of b
are used as addresses
into the 16 bytes of a
.
In addition, if the highest significant bit of a byte of b
is set, the respective destination byte is set to 0.
Picturing a
and b
as [u8; 16]
, _mm_shuffle_epi8
is
logically equivalent to:
fn mm_shuffle_epi8(a: [u8; 16], b: [u8; 16]) -> [u8; 16] {
let mut r = [0u8; 16];
for i in 0..16 {
// if the most significant bit of b is set,
// then the destination byte is set to 0.
if b[i] & 0x80 == 0u8 {
r[i] = a[(b[i] % 16) as usize];
}
}
r
}
Run