Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add mohitmishra786/low-level-dev-skills --skill code-generation-and-backendsgit clone --depth 1 https://github.com/mohitmishra786/low-level-dev-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/mohitmishra786/low-level-dev-skills/code-generation-and-backends)<a href="https://agentmods.dev/skills/mohitmishra786/low-level-dev-skills/code-generation-and-backends"><img src="https://agentmods.dev/badge/skills/mohitmishra786/low-level-dev-skills/code-generation-and-backends/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/mohitmishra786/low-level-dev-skills/code-generation-and-backends"><img src="https://agentmods.dev/badge/skills/mohitmishra786/low-level-dev-skills/code-generation-and-backends.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00059 | $0.00827 |
| Opus 5 | $0.00030 | $0.00413 |
| Sonnet 5 | $0.00012 | $0.00165 |
| Haiku 4.5 | $0.00006 | $0.00083 |
Grade A, and why
code-generation-and-backends scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 96 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Code Generation and Backends
Purpose
Overview LLVM (and general compiler) backend code generation: IR legalization, SelectionDAG instruction selection, register allocation, assembly emission, and what adding a new target entails — complementing IR skills and skills/compiler-internals/llvm-passes.
When to Use
- Reading
llcoutput for a specific target - Understanding why IR type legalizer inserted extra ops
- Evaluating porting compiler to new architecture (high level)
- Debugging wrong code at asm layer (not IR)
Workflow
1. Backend pipeline (LLVM)
LLVM IR per function
├── IR legalizer (types/ops target supports)
├── SelectionDAGBuilder
├── LegalizeTypes / LegalizeOps
├── Instruction selection (pattern match TableGen)
├── Scheduling (pre-RA)
├── Register allocation
├── Prolog/epilog insertion
└── AsmPrinter → .s object
2. llc usage
clang -c -emit-llvm -O2 -o foo.bc foo.c
llc -march=aarch64 -O2 foo.bc -o foo.s
llc -march=riscv64 -O2 foo.bc -o foo-rv.s
3. TableGen patterns (conceptual)
def ADD32rr : Pat<(add i32 GPR:$a, GPR:$b),
(ADD32rr GPR:$a, GPR:$b)>;
Patterns map DAG nodes to machine instructions. .td files define registers, calling conv, instr formats.
4. Calling convention lowering
ABI rules become CC_AArch64 / CC_X86_64 in TableGen — ties to skills/computer-architecture/abi-and-calling-conventions.
5. Target triple
clang --target=arm-none-eabi -c -O2 foo.c
llc -mtriple=thumbv7em-none-eabi foo.bc
Mismatch between triple and CPU features (+neon, +crc) causes legalizer failures or suboptimal code.
6. Adding a target (outline)
- Define register classes and instr formats in TableGen
- Implement lowering hooks (
TargetLowering) - AsmPrinter and MC layer for relocations
- Builtin calling convention and ELF/COFF object writer
Full port is large — reuse existing backend closest to arch.
7. Agent usage
/code-generation-and-backends Trace how this IR add becomes AArch64 ADD instruction
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 9d ago First seen · 96 lines · 59 tokens per session scan A a7dfd642aeb3
code-generation-and-backends is a skill published in the GitHub repository mohitmishra786/low-level-dev-skills (198 stars, last pushed 2mo ago), licensed MIT. It adds 59 tokens to every session and 827 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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