In our writing tests with KImageFormat's EXR plugin, we noticed a significant conversion difference
between ARM64 and AMD64. From our tests it appears that the problem occurs on Intel x86_64 (verified on Linux and Windows).

The following QImage formats were incorrectly converted to Format_RGBA16FPx4:

• Format_ARGB32_Premultiplied
• Format_ARGB6666_Premultiplied
• Format_ARGB8555_Premultiplied
• Format_ARGB8565_Premultiplied
• Format_RGBA8888_Premultiplied

I've attached the source image used, an example of an FP16 image with the problem, and an FP32 image for comparison (unaffected).

I've also included a small program to facilitate verification.