```
    const __m128i ___n = _mm_set_epi32( 0x80808080, 0x80808080, 0x80808080, 0x80808080 );
    const __m128i w___ = _mm_set_epi32( 0x80808080, 0x80808080, 0x80808080, 0x0f0e0d0c );
    const __m128i z___ = _mm_set_epi32( 0x80808080, 0x80808080, 0x80808080, 0x0b0a0908 );
    const __m128i zw__ = _mm_set_epi32( 0x80808080, 0x80808080, 0x0f0e0d0c, 0x0b0a0908 );
    const __m128i y___ = _mm_set_epi32( 0x80808080, 0x80808080, 0x80808080, 0x07060504 );
    const __m128i yw__ = _mm_set_epi32( 0x80808080, 0x80808080, 0x0f0e0d0c, 0x07060504 );
    const __m128i yz__ = _mm_set_epi32( 0x80808080, 0x80808080, 0x0b0a0908, 0x07060504 );
    const __m128i yzw_ = _mm_set_epi32( 0x80808080, 0x0f0e0d0c, 0x0b0a0908, 0x07060504 );
    const __m128i x___ = _mm_set_epi32( 0x80808080, 0x80808080, 0x80808080, 0x03020100 );
    const __m128i xw__ = _mm_set_epi32( 0x80808080, 0x80808080, 0x0f0e0d0c, 0x03020100 );
    const __m128i xz__ = _mm_set_epi32( 0x80808080, 0x80808080, 0x0b0a0908, 0x03020100 );
    const __m128i xzw_ = _mm_set_epi32( 0x80808080, 0x0f0e0d0c, 0x0b0a0908, 0x03020100 );
    const __m128i xy__ = _mm_set_epi32( 0x80808080, 0x80808080, 0x07060504, 0x03020100 );
    const __m128i xyw_ = _mm_set_epi32( 0x80808080, 0x0f0e0d0c, 0x07060504, 0x03020100 );
    const __m128i xyz_ = _mm_set_epi32( 0x80808080, 0x0b0a0908, 0x07060504, 0x03020100 );
    const __m128i xyzw = _mm_set_epi32( 0x0f0e0d0c, 0x0b0a0908, 0x07060504, 0x03020100 );
    const __m128i LUT[16] = { ___n, x___, y___, xy__, z___, xz__, yz__, xyz_, w___, xw__, yw__, xyw_, zw__, xzw_, yzw_, xyzw };

```

I use a lookup table like the one above for the SSE/SSSE3 version of a compare and left pack routine. A set of compares happens multiple (60) times per second and I'd like it to be in memory instead of set each time and have scope limited to one .c file but trying to define it out of a function with or without static yields the error: **initializer element is not constant.** for each 'set'. Why does this happen and how can I do this properly?