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#pragma optimize( "", off )

#pragma optimize( "", off )
before
void LibRaw::vc5_dng_load_raw_placeholder()

and
#pragma optimize( "", on )
before
void LibRaw::adobe_copy_pixel(unsigned row, unsigned col, ushort **rp)

(in src/decoders/dng.cpp)
Will probably fix the issue.

These pragmas are Visual Studio specific; we'll implement wider solution in the next update

-- Alex Tutubalin @LibRaw LLC