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LHE file mismatch fortran vs cudacpp in tlau (for multi backend builds, possibly for normal builds too) - also: "fail to reach target" #993

@valassi

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@valassi

I just had a quick first look at lhe event files produced in multi backend tests.

In dy+3j just a few occasional events are the same, but most are different. The problem is also that the weight is completely different. This is from the 500 events in PR #948

diff events_fortran.lhe events_cppnone.lhe | more
450c450
< #  Integrated weight (pb)  :       142.38107118268414
---
> #  Integrated weight (pb)  :       3199.366020218372
455c455
< 1.423811e+02 6.637245e-01 1.423811e+02 0
---
> 3.199366e+03 1.661125e+01 3.199366e+03 0

Will need to understand this.

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