loop-vectorization

Amap Tech

Jan 26, 2024 · Fundamentals

Debugging a GCC O3 Loop Vectorization Crash: Analysis, Root Cause, and Fix

A segmentation fault in a simple tile‑index copy loop was traced to GCC 9.2’s -O3 loop‑vectorization pass miscalculating structure offsets, and the issue was resolved by disabling -ftree-loop-vectorize or upgrading the compiler, as newer GCC versions and Clang handle the code correctly.