[llvm] [WebAssembly] Disallow tail calls with byval arguments (PR #125142)

[Derek Schuff via llvm-commits]

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@@ -1211,6 +1211,13 @@ WebAssemblyTargetLowering::LowerCall(CallLoweringInfo &CLI,
         }
       }
     }
+    // Similarly, we cannot tail call with byval arguments.
+    for (unsigned I = 0; I < CLI.Outs.size(); ++I) {
+      const ISD::OutputArg &Out = CLI.Outs[I];
+      if (Out.Flags.isByVal() && Out.Flags.getByValSize() != 0)
+        NoTail(
+            "WebAssembly does not support tail calling with stack arguments");
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dschuff wrote:

This message can probably more specifically mention byval arguments.

https://github.com/llvm/llvm-project/pull/125142