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code-generation-and-backends

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Use when reading llc output, tracing IR through legalization and instruction selection, or scoping a new LLVM target. Not for IR-level passes: use llvm-ir-and-passes.

.devin/skills/code-generation-and-backends/SKILL.md

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# Code generation and backends

## Contract

| Field | Bound contract |
|---|---|
| Trigger | A user asks how LLVM IR becomes machine code for a target, why the legalizer inserted extra operations, why `llc` and `clang` emit different assembly, what an `llc` fatal error at instruction selection means, or what a port to a new architecture involves. |
| Authority | Reversible local: writes only bitcode and assembly files under a scratch directory named in the report; rollback is deleting that directory. No remote mutation. |
| Side effect | Runs `clang` and `llc` on the supplied source or bitcode and reads the emitted assembly. Project files are not modified. |
| Done | A codegen report names the stage that produced each observed instruction sequence or failure, the triple and feature set in effect, and the fix or expansion path for every failure. |

## Inputs

1. Source file, LLVM IR (`.ll`), or bitcode (`.bc`) (required).