[clang] [clang] Constexpr for __builtin_shufflevector and __builtin_convertvector (PR #76615)

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Pol Marcet =?utf-8?q?Sardà?= <polmarcetsarda at gmail.com>,
Pol Marcet =?utf-8?q?Sardà?= <polmarcetsarda at gmail.com>,Pol M
 <polmarcetsarda at gmail.com>
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In-Reply-To: <llvm.org/llvm/llvm-project/pull/76615 at github.com>


https://github.com/sethp commented:

Hi @Destroyerrrocket, thanks for your work getting vectors into constexpr-land! I'm also curious about that, so I did my best to give you a helpful review. 

The only part I'd be uncomfortable about merging is the handling of `-1` sentinels / indeterminate values: everything else I expect you to take as no more than a gentle suggestion.

https://github.com/llvm/llvm-project/pull/76615