# Function _mm_loadr_ps

1.27.0 · Source

    pub unsafe fn _mm_loadr_ps(p: *const f32) -> __m128

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

Loads four `f32` values from aligned memory into a `__m128` in reverse order.

If the pointer is not aligned to a 128-bit boundary (16 bytes) a general protection fault will be triggered (fatal program crash).

Functionally equivalent to the following code sequence (assuming `p` satisfies the alignment restrictions):

    let a0 = *p;
    let a1 = *p.add(1);
    let a2 = *p.add(2);
    let a3 = *p.add(3);
    __m128::new(a3, a2, a1, a0)

This corresponds to instructions `VMOVAPS` / `MOVAPS` followed by some shuffling.

Intel’s documentation