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      "text": "AVX-512 mismatch — when -march=native bites in containers",
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      "text": "Build host (your laptop / CI)\nIntel Sapphire Rapids — has AVX-512\n\n/proc/cpuinfo flags:\navx avx2 avx512f avx512dq\navx512cd avx512bw avx512vl ...\n\ngcc -march=native picks up ALL of these\n\n$ gcc -march=native -O3 ...\nemits AVX-512 instructions",
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      "type": "rectangle", "version": 1, "id": "image",
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      "text": "Container image\nportable filesystem, NON-portable CPU code\n\n/usr/local/bin/app contains:\n  vmovdqa64 zmm0, [rdi]   ← AVX-512\n  vpaddq    zmm0, zmm0, zmm1\n  vmovdqa64 [rsi], zmm0\n\nimage is byte-identical regardless\nof which host it lands on",
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      "fontSize": 11, "fontFamily": 1,
      "text": "Runtime host (prod / cloud)\ne.g. AMD Zen 3, older Xeon, c5.large\n\n/proc/cpuinfo flags:\navx avx2  (no avx512!)\n\nCPU does not implement\nvmovdqa64 / zmm registers\n\n$ podman run app\nfirst AVX-512 instruction hits CPU",
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      "fontSize": 18, "fontFamily": 1,
      "text": "SIGILL\nillegal instruction\nprocess aborts on the first hot path",
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      "type": "rectangle", "version": 1, "id": "fix-band",
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      "text": "The fix — choose a portable CPU baseline at build time, not the build host's",
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      "type": "text", "version": 1, "id": "fix-option-1",
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      "fontSize": 11, "fontFamily": 1,
      "text": "Option 1 — x86-64 micro-architecture levels (recommended)\n  x86-64       baseline; works on any x86_64 CPU\n  x86-64-v2    SSE3-SSE4.2, popcnt — Nehalem era+\n  x86-64-v3    AVX, AVX2, BMI1/2, FMA — Haswell+ (most modern)\n  x86-64-v4    AVX-512 — opt-in only after surveying targets",
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      "type": "text", "version": 1, "id": "fix-option-2",
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      "roughness": 1, "opacity": 100, "groupIds": ["fix-group"],
      "fontSize": 11, "fontFamily": 1,
      "text": "Option 2 — multi-arch builds + runtime dispatch\n  build two image variants:\n    app:v1.2-v3   (Haswell baseline)\n    app:v1.2-v4   (AVX-512 enabled)\n  → pick at deploy time via host CPU detection",
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