Individual skill

pgo

Use when a C or C++ binary needs profile-guided optimization with GCC or Clang: instrumented or sampled profiles, merging, the two-stage build, or BOLT. Not for base flags: use gcc or clang.

.devin/skills/pgo/SKILL.md

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License: Apache-2.0

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# Profile-guided optimization

## Contract

| Field | Bound contract |
|---|---|
| Trigger | The user asks how to apply PGO, how `-fprofile-generate` and `-fprofile-use` fit together, how to collect a representative profile, or how BOLT differs from PGO. |
| Authority | Read-only. The skill emits the build sequence, collection commands, and a measurement plan to chat; the user runs them. Rollback is not needed. No remote mutation. |
| Side effect | Chat output. |
| Done | A two-stage build sequence for the user's compiler is reported with the profile format named, the workload checklist is applied, and the speedup claim rests on a before-and-after measurement command rather than a number. |

## Inputs

- Compiler and version: required. GCC 16.2 or Clang 23.1.0 are current stable; each has its own profile format.