Compiler-Assisted Floating-Point Error Analysis and Profiling with FPChecker · Tutorial

ISC High Performance 2026 (ISC26), Hamburg, Germany June 22, 2026

Time: 9:00am - 1pm Europe/Berlin (half-day tutorial) Location: CCH – Congress Center Hamburg, Room: Hall X12 - 1st Floor

Description

Floating-point arithmetic is central to scientific computing, but small rounding effects can accumulate into significant numerical errors, especially when applications are ported to lower precision for performance and energy savings. This tutorial introduces compiler-assisted analysis tools built on the FPChecker framework (https://fpchecker.org/) and clang/LLVM to instrument C/C++ code and expose floating-point behavior.

Participants will learn how to evaluate dynamic range and precision requirements, track rounding and relative error propagation across code regions, and detect infinities and NaNs caused by numerical limits. Hands-on examples, including linear solvers, finite-difference methods, and other C/C++ codes, will run on participants’ laptops. In the advanced session, attendees can apply the tools to applications or widely used numerical libraries. All tools and examples will be distributed through Conda, with pre-configured AWS instances available for participants who cannot use it.

Presenter

Ignacio Laguna, Lawrence Livermore National Laboratory

AWS Instances

https://fpchecker.org/usernames

Presentation Slides

The tutorial slides are here: slides

Repositories:

FPChecker: https://github.com/LLNL/FPChecker Documentation