[clang] [CIR][AArch64] Lower NEON vshrn* intrinsics (PR #226382)

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llvmorg-github-actions[bot] wrote:


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@llvm/pr-subscribers-clangir

Author: Jiahao Guo (E00N777)

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<summary>Changes</summary>

## summary

part of : https://github.com/llvm/llvm-project/issues/185382

Lower all intrinsics in : https://arm-software.github.io/acle/neon_intrinsics/advsimd.html#vector-shift-right-and-narrow

Assisted by : gpt-6-sol


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Full diff: https://github.com/llvm/llvm-project/pull/226382.diff


3 Files Affected:

- (modified) clang/lib/CIR/CodeGen/CIRGenBuiltinAArch64.cpp (+11-5) 
- (modified) clang/test/CodeGen/AArch64/neon-intrinsics.c (-162) 
- (modified) clang/test/CodeGen/AArch64/neon/intrinsics.c (+173) 


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https://github.com/llvm/llvm-project/pull/226382