This program emits psllw instead of pslliw instruction. pslliw should be usable here since imm8 is a constant:

extern crate stdsimd;

use std::env;
use stdsimd as s;

fn main() {
    let imm8: i32 = env::args().nth(1).unwrap().parse().unwrap();
    let a = s::i16x8::new(imm8 as i16, 0, 0, 0, 0, 0, 0, 0);
    println!("{:?}", s::_mm_slli_epi16(a, 4));
}

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LLVM types the count parameter in _mm_sll_epi16 as i16x8, but the right type is probably i64x2.

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What is the deal with the ucomi f64 comparison functions in SSE2? Clang‘s headers indicate some specific behavior with NAN, but I can’t seem to reproduce it. Intel's official docs are very vague.

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_mm256_blendv_pd takes a mask parameter with type f64x4, but the documentation seems to indicate that it is a bit vector. What's going on?