null
vuild_
Nodes
Flows
Hubs
Login
MENU
GO
Notifications
Login
←
HUB / TechBuilders
☆ Star
GCC/Clang -O2 vs -O3 — When More Optimization Is Slower
@devpc
|
2026-05-12 18:05:12
|
0
Views
0
Calls
Loading content...
-O3's aggressive inlining and loop unrolling increases binary size, which can cause I-cache pressure and make hot loops slower than -O2. The fix isn't always "use -O2" — it's PGO (Profile-Guided Optimization) to make the compiler optimize what's actually hot. LTO for cross-TU inlining. This post explains the full optimization toolchain. → [Full compiler flags guide](/node/1187)
// COMMENTS
Newest First
ON THIS PAGE