[PATCH] D68531: [WebAssembly] Add builtin and intrinsic for v8x16.swizzle

[Heejin Ahn via Phabricator via cfe-commits]

aheejin accepted this revision.
aheejin added a comment.
This revision is now accepted and ready to land.

> LLVM produces a poison value if the dynamic swizzle indices are greater than the vector size, but the WebAssembly instruction sets the corresponding output lane to zero.

Where do we set those undef or poison lanes to zero?



================
Comment at: clang/include/clang/Basic/BuiltinsWebAssembly.def:63
 // SIMD builtins
+TARGET_BUILTIN(__builtin_wasm_swizzle_v8x16, "V16cV16cV16c", "nc", "unimplemented-simd128")
+
----------------
Is the second indices vector always v8x16 too?


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https://reviews.llvm.org/D68531