Fortran to C Migration

Fortran remains important in scientific computing, engineering, simulation, and high-performance workloads. Zwiegnet provides Fortran to C migration services for organizations that need to modernize legacy code, integrate with C-based systems, or make long-lived applications easier to maintain across Linux, Unix, and cloud environments.

Migration is approached carefully: numerical behavior, data layouts, compiler assumptions, and performance are treated as requirements—not afterthoughts.

Our migration process includes:

• Code and Dependency Assessment – Inventory Fortran source, modules, COMMON blocks, include files, compiler extensions, libraries, build scripts, and external interfaces.
• Numerical Semantics Review – Identify floating-point precision, array indexing, argument passing, implicit typing, and evaluation-order assumptions that can affect results.
• Translation Strategy – Determine which routines can be translated or generated automatically and which require deliberate manual conversion and review.
• Array and Data Conversion – Map Fortran arrays, records, and data structures into clear C representations while preserving expected memory layout where required.
• Library Integration – Plan replacements or interoperability for BLAS, LAPACK, math routines, and other scientific libraries.
• Linux and Unix Porting – Build and validate with GCC, Clang, and platform-appropriate toolchains on Linux, Unix, or cloud infrastructure.
• Regression and Numerical Testing – Compare reference outputs, edge cases, tolerances, and representative production workloads before cutover.
• Performance Validation – Benchmark representative calculations and profile hot paths rather than assuming translated code will automatically be faster.
• Documentation and Handoff – Document design decisions, build procedures, known limitations, and future maintenance practices.

The goal is a controlled modernization path that preserves trusted scientific results while improving portability, integration, and long-term maintainability.

Located between Madison and Milwaukee, Wisconsin since 2009 — direct, personal service focused on practical systems engineering.