[llvm-branch-commits] [MSAN] handle AVX vpermi2var (PR #143463)

[Thurston Dang via llvm-branch-commits]

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@@ -4175,6 +4175,25 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
     setShadow(&I, IRB.CreateBitCast(CI, getShadowTy(&I)));
     setOriginForNaryOp(I);
   }
+  // Instrument AVX permutation intrinsic.
+  // We apply the same permutation (argument index 1) to the shadows.
+  void handleAVXVpermil2var(IntrinsicInst &I) {
+    IRBuilder<> IRB(&I);
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thurstond wrote:

Please add some assertions that check whether the instruction is suitable for this handler:

- number of operands
- type and size of each operand
- relation of input and output operands

https://github.com/llvm/llvm-project/pull/143463