[Octave-bug-tracker] [bug #47746] imwrite writes incorrect TIFF pixel values from uint8 array on i686-linux-gnu

[Mike Miller]

Follow-up Comment #6, bug #47746 (project octave):

When building with -O2 (default optimization) on i686, the following fails


x = uint8 (0:255);
alpha = uint8 (0:255);
imwrite (x, "test.tif", "Alpha", alpha);
y = imread ("test.tif");
isequal (x, y)


But it succeeds when I build Octave with -O0. When I examine the pixel values
in gdb with -O0, they are identical between i686 and x86_64, but I get
optimized out when build with -O2.

Other tests still fail even with -O0, such as uint8 rgb image with alpha,
looking at those next.

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