ikawrakow/ik_llama.cpp
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github-data/pull_requests/137 - Fix AVX2 implementation of iq4_nl_r4.md Normal file
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### 🐛 [#137](https://github.com/ikawrakow/ik_llama.cpp/pull/137) - Fix AVX2 implementation of iq4_nl_r4
| **Author** | `ikawrakow` |
| :--- | :--- |
| **State** | ❌ **Closed** |
| **Created** | 2024-12-11 |
| **Updated** | 2024-12-11 |
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#### Description
The implementation was using `_mm256_maddubs_epi16`, which overflows (and gets saturated) with the unsigned version of the non-linear quants `IQ4_NL` lookup table. This PR fixes it without a noticeable performance loss.