Re: [Openexr-devel] Optimisation code path for reading images

[Halfdan Ingvarsson]

Also, compiling the EXR2.0 library using gcc 4.2/4.3/4.4 with -O3 results in the PIZ compression code producing occasional garbage data (-O3 is the default for cmake release builds). The workaround was to build with -O2. gcc 4.6 and up seem ok. I didn't test with gcc 4.5.

Unfortunately, I didn't have time to dig any deeper as to whether this was an actual optimizer bug, or whether there are some spurious assumptions in the code leading to it.

Just something to keep in mind.

 - ½

On 13-06-17 09:35 PM, Piotr Stanczyk wrote:

Hi,

There have been a few usage cases reported that exercised parts of the optimised reading code path which unfortunately revealed erroneous assumptions in the source.

We have a fix for handling these, which also extents to handling more general cases,  in a separate branch and will be releasing that once we have built up more usage cycles.

In the meantime, however, a v2.0.1 release will be available shortly, which disables the optimisation.

- Piotr

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