error: Undefined Behavior: dereferencing pointer failed: ALLOC has size 9, so pointer to 1 byte starting at offset 9 is out-of-bounds
  --> RUSTLIB/core/src/../../portable-simd/crates/core_simd/src/vector.rs:LL:CC
   |
LL |         unsafe { intrinsics::simd_gather(or, ptrs, enable.to_int()) }
   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ dereferencing pointer failed: ALLOC has size 9, so pointer to 1 byte starting at offset 9 is out-of-bounds
   |
   = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
   = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
   = note: BACKTRACE:
   = note: inside `std::simd::Simd::<i8, 4>::gather_select_unchecked` at RUSTLIB/core/src/../../portable-simd/crates/core_simd/src/vector.rs:LL:CC
note: inside `main`
  --> $DIR/simd-gather.rs:LL:CC
   |
LL |         let _result = Simd::gather_select_unchecked(&vec, Mask::splat(true), idxs, Simd::splat(0));
   |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace

error: aborting due to previous error