FEniCS/ffcx

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Next generation FEniCS Form Compiler for finite element forms

Stars: 192
Forks: 45
Open beginner issues: 0
Indexed issues: 41
Avg merge: 1d 11h
Merged PRs (30d): 16

Dominant language: Python
License: No license data
Last GitHub push: Sep 14, 2026
Latest indexed: Sep 15, 2026
Contributing guide: No contributing guide
Code of conduct: Code of conduct
Beginner labels: good first issue

Open All

41 open issues indexed

Add Python type hints Open

enhancement

FEniCS/ffcx#18 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
CellDiameter not defined for higher-order cells Open

FEniCS/ffcx#162 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Fix generated code indentation Open

good first issue

FEniCS/ffcx#209 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Add more JIT tests Open

testing

FEniCS/ffcx#217 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Custom quadrature rules, runtime quadrature Open

proposal

FEniCS/ffcx#243 · 7 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Support for H2 conforming element Open

enhancement

FEniCS/ffcx#245 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Factorization failure for certain conditionals Open

FEniCS/ffcx#246 · 7 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Add interface to compute cell volume by quadrature Open

FEniCS/ffcx#283 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
test_lagrange in test_jit_forms.py runs very slowly (times out on Ubuntu focal 20.04) Open

testing

FEniCS/ffcx#388 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Don't flatten Basix tabulated data Open

enhancement

FEniCS/ffcx#404 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Derivative of JacobianInverse fails Open

FEniCS/ffcx#445 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Form with domain markers creates duplicated kernels Open

FEniCS/ffcx#447 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Write quadrature points into generated code? Open

proposal question

FEniCS/ffcx#544 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Create alias for elements Open

FEniCS/ffcx#547 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Support CellVolume for Expressions on non-simplex geometries Open

bug enhancement

FEniCS/ffcx#550 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Support different dof orderings on a cell Open

enhancement proposal

FEniCS/ffcx#557 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Store coefficient values at quadrature points for kernels Open

FEniCS/ffcx#565 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
More expressive filenames for graph-visualization Open

FEniCS/ffcx#633 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Quadrature-points symbol not stored as table Open

FEniCS/ffcx#650 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Missing bessel functions Open

bug

FEniCS/ffcx#673 · 8 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Remove `ufcx.h` Open

proposal

FEniCS/ffcx#687 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Facet and Cell averages Open

FEniCS/ffcx#693 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Optimize float-products with LiteralFloat(0.) Open

FEniCS/ffcx#702 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Add minimal CMake + C example Open

FEniCS/ffcx#711 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Unit stride access of blocked Coefficients Open

generated-code performance

FEniCS/ffcx#713 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Casting warnings on Windows Open

FEniCS/ffcx#715 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
`domain_dof_access` with multiple domains Open

bug

FEniCS/ffcx#734 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Add a test that tests vertex quadrature Open

testing

FEniCS/ffcx#738 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Fix `ffcx` to create `dS` integrals for cells with multiple facet types (pyramid, prism etc.) Open

FEniCS/ffcx#740 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Improve support for custom integration kernels Open

FEniCS/ffcx#750 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Roll out fenicsx-refs.yml to FFCx Open

FEniCS/ffcx#792 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Extend `mypy` checking to demos and tests Open

good first issue type-hints

FEniCS/ffcx#802 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
test_ds_prism fails on s390x Open

FEniCS/ffcx#815 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Codimension 1 derivative index is wrong Open

bug

FEniCS/ffcx#816 · 2 comments · 0 reactions · 2 assignees · Indexed Sep 15, 2026
Sporadical CI failures in `test_numba.py` Open

FEniCS/ffcx#822 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Interpolation expression support Open

enhancement generated-code proposal

FEniCS/ffcx#827 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Support max quadrature as metadata. Open

FEniCS/ffcx#832 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Simplify if statement in element tables Open

housekeeping

FEniCS/ffcx#837 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
MSVC complains about POSIX calls to special math functions e.g. `j0` Open

FEniCS/ffcx#839 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Factorization graph ~2x larger than a reference compiler's for elasticity_p1 (non-AD form) -- likely broader than the HyperElasticity case Open

FEniCS/ffcx#864 · 8 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Quadrature degree over-estimated for mixed-element form components (stokes_th_tet: 5-point rule instead of the minimal 4-point rule) Open

FEniCS/ffcx#866 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026

FEniCS/ffcx

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