png_log16bit      814 contrib/libtests/tarith.c          double error = png_log16bit(i) - correct;
png_log16bit      819 contrib/libtests/tarith.c          if (i == 0 && png_log16bit(i) != 0xffffffff ||
png_log16bit      820 contrib/libtests/tarith.c              i != 0 && png_log16bit(i) != floor(correct+.5))
png_log16bit      825 contrib/libtests/tarith.c                   " error: %f\n", i, png_log16bit(i), correct, error);
png_log16bit     3718 png.c                   png_int_32 lg2 = png_log16bit(value);