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compiler-optimizations-deep

Use when -O3 leaves a hot loop scalar, spills appear in assembly, or a PGO or BOLT deployment is planned or stalls. Not for machine lowering: use code-generation-and-backends.

.devin/skills/compiler-optimizations-deep/SKILL.md

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Nov 4, 2026

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Sep 28, 2026
License
Apache-2.0

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# Compiler optimizations, deep

## Contract

| Field | Bound contract |
|---|---|
| Trigger | A hot loop stayed scalar at `-O3`, assembly shows spills, `-O3` runs slower than `-O2`, GCC and Clang produce different code for the same source, or a profile-guided or post-link optimization is being planned or produced no gain. |
| Authority | Reversible local: writes only instrumented binaries, profiles, and remark files under a scratch directory named in the report; rollback is deleting that directory. No remote mutation. |
| Side effect | Runs the compiler with remark flags, and when asked, an instrumented build and a training run. Project files are not modified. |
| Done | Each symptom is attributed to a named pipeline stage with the compiler's own remark or output as evidence, and each fix is stated as a source change, a flag, or a workflow step the user can apply. |

## Inputs

1. Source and the exact compile command (required): the flags decide which passes run.