A crash can occur while cooking in 4.18 in ispc_texcomp.dll. This was reported as being the result of an instruction that is only available for "Haswell and newer Intel CPUs." Pre-Haswell CPU's will crash when this instruction runs.

Rebuilding ispc_texcomp.dll with the latest from Intel appears to resolve this issue.

This also occurs on our internal carts, which aren't pre-Haswell. So far it has not occurred on anyone's Xenon chips in Engine QA.

Steps to Reproduce

Unable to repro internally. Requires a pre-Haswell CPU, which we are not sure we have available.

Have Comments or More Details?

There's no existing public thread on this issue, so head over toAnswerHub just mention UE-52281 in the post.

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Affects Versions4.18
Target Fix4.18.14.19
Fix Commit3754814
Release Commit3754814
CreatedNov 10, 2017
ResolvedNov 13, 2017
UpdatedJan 3, 2018
Pull Requests
4447 - klorberg