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Summary of findings so far:

Attached is a make script that applies the minimal set of optimizations (at least on gcc 7) that still triggers the seg fault.

It fails the first time that address is executed, when NUMKEYS(fp) hits 10 or 11 (I *think* depending on the alignment of fp).

It looks like the autovectorization logic is split in three parts: one unaligned non-SSE copy, an aligned copy that uses SSE, and then an unaligned non-SSE copy. It makes sense that the SSE logic path is only triggered when the size is greater than some threshold.

We should coordinate filing a gcc bug report.

Nic Watson

On Fri, Mar 16, 2018 at 3:11 PM, openldap-its@openldap.org wrote:

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