On 12/04/2022 21:26, Charles Ballard - STFC UKRI wrote:
I usually see this when switching between cpus, an optimisation for an
instruction set not supported by the running cpu. Mostly AVX 2 or
SSE4(?) when running on older hardware, or across the AMD/Intel divide.
Unfortunately this means -mtune=generic rather than letting the
libraries detect. Not sure if libgmp supports functions for
multiple architectures (another thing to check)
That makes sense.
This binary was build using these processors:
vendor_id : GenuineIntel
model name : Intel(R) Xeon(R) CPU E5-1650 v4 @ 3.60GHz
What processors are you using Chris?
Paul.
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