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@paul @adam_chal I suspect the difference is because on x86_64 the default libc does not use FMA (since it is not part of x86_64v1) while on aarch64 (since FMA is part of armv8-a) will use FMA.
Especially when it is 2up difference.
Fused Multiple Add can make a huge difference since the addition is done in infinite precision after the multiply and only rounded afterwards.