[llvm] [AArch64][SME] Lower memchr to __arm_sc_memchr in streaming[-compatible] functions (PR #168896)

[Benjamin Maxwell via llvm-commits]

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@@ -194,7 +200,11 @@ SDValue AArch64SelectionDAGInfo::EmitStreamingCompatibleMemLibCall(
   PointerType *RetTy = PointerType::getUnqual(*DAG.getContext());
   CLI.setDebugLoc(DL).setChain(Chain).setLibCallee(
       TLI->getLibcallCallingConv(NewLC), RetTy, Symbol, std::move(Args));
-  return TLI->LowerCallTo(CLI).second;
+
+  auto [Result, ChainOut] = TLI->LowerCallTo(CLI);
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MacDue wrote:

That's right. However, the hooks for the calls other than memchr are only used to lower the intrinsics, which return void. The memchr hook is used to replace the standard libcall (and there's no memchr intrinsic).

https://github.com/llvm/llvm-project/pull/168896