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ghc-9 introduces a regression(?) in FP precision (See ghc ticket #19569).
While this is unfortunate we want nofib to be useable with ghc 8.10 and
9.0 as far as possible.

So I added an additional argument to the benchmark which controls if we
output the benchmark result or not, which is off by default.

This allows easy checking of the output manually without causing
benchmark errors because the output differs.

I've also added the benchmark to the ghc testsuite to avoid future
regressions.

Alex D authored Mar 01, 2022 and Matthew Pickering committed Mar 02, 2022

Current test does some floating-point manipulations which can be non-deterministic
due to different platforms/architectures. This change truncates the result to
avoid potential stdout mismatch.

Ben Gamari authored May 13, 2021 and Andreas Klebinger committed Nov 13, 2021

By reducing the size of the raytraced image.

This can be used via passing --head to the nofib runner.

It will build benchmark dependencies using the given benchmark compiler
and hackage.head.

* We adjust for the specialisation of Data.List by hiding the generic
  version from the Prelude.

This should make this change backwards compatible with older base
versions.

* Adjust the gc benchmarks. I've mostly made them the same as their
  non-gc parts now.

See !5259