lab Mistral AI News · 18h ago · releases

Mistral helps European energy operator migrate 40,000 lines of Fortran 77 to C++

from English

Mistral assisted a European energy operator in migrating 40,000 lines of legacy Fortran 77 code for a physics-intensive reservoir simulator to modern C++. The project addressed the challenges of translating procedural code with global state into an object-oriented architecture while ensuring numerical parity.

Mistral built a parity harness to verify that migrated C++ modules matched the original Fortran outputs numerically.
Agents documented the scattered legacy codebase by generating a caller-callee tree and reconciling old PDFs with the source.
The team utilized a structured workflow combining planner, coder, tester, and reviewer agents alongside human oversight.
This approach successfully migrated 40,000 lines in the first sprint out of a total of 300,000 lines.

The case study highlights that building a parity harness and organizing documentation before migration are critical steps for success. It also demonstrates that structured workflows with human review gates are more effective than fully autonomous agents for complex legacy modernization.

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