A test program of mine is around 20% slower when moving from FEniCS 1.1
to FEniCS 1.2. Are the C++ optimisation flags
(parameters["form_compiler"]["cpp_optimize_flags"]) definitely applied
when using Instant 1.2? I can't see them being used by any files in
~/.instant/cache, and I can't see any obvious use in instant/build.py.
Manually rolling back to Instant 1.1 (with some surgery to UFC 2.2)
fixes the performance issue.

James Maddison

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