Hi, I'm getting the following warning from gcc-6.4.0 in libraw_cpp.cxx:

* /tmp/portage/portage/media-libs/libraw-0.18.5/work/LibRaw-0.18.5/src/libraw_cxx.cpp:1784:64: warning: iteration 6 invokes undefined behavior [-Waggressive-loop-optimizations]

CFLAGS="-O2 -march=native -ftree-vectorize -mprefer-avx128 -mvzeroupper -fstack-protector -ftree-loop-distribution -ftree-loop-distribute-patterns -pipe"

Code:

static inline void unpack28bytesto16x16ns(unsigned char *src, unsigned short *dest)
{
dest[0] = (src[3] << 6) | (src[2] >> 2);
dest[1] = ((src[2] & 0x3) << 12) | (src[1] << 4) | (src[0] >> 4);
dest[2] = (src[0] & 0xf) << 10 | (src[7] << 2) | (src[6] >> 6);
dest[3] = ((src[6] & 0x3f) << 8) | src[5];
dest[4] = (src[4] << 6) | (src[11] >> 2);
dest[5] = ((src[11] & 0x3) << 12) | (src[10] << 4) | (src[9] >> 4);
dest[6] = (src[9] & 0xf) << 10 | (src[8] << 2) | (src[15] >> 6);
dest[7] = ((src[15] & 0x3f) << 8) | src[14];
dest[8] = (src[13] << 6) | (src[12] >> 2);
dest[9] = ((src[12] & 0x3) << 12) | (src[19] << 4) | (src[18] >> 4);
dest[10] = (src[18] & 0xf) << 10 | (src[17] << 2) | (src[16] >> 6);
dest[11] = ((src[16] & 0x3f) << 8) | src[23]; ## line 1784
dest[12] = (src[22] << 6) | (src[21] >> 2);
dest[13] = ((src[21] & 0x3) << 12) | (src[20] << 4) | (src[27] >> 4);
dest[14] = (src[27] & 0xf) << 10 | (src[26] << 2) | (src[25] >> 6);
dest[15] = ((src[25] & 0x3f) << 8) | src[24];
}