From 4f27e889dbdefa3b55d89f8b0cf319419eae41bd Mon Sep 17 00:00:00 2001
From: Alon Zakai <azakai@google.com>
Date: Mon, 13 Mar 2023 13:28:36 -0700
Subject: [Wasm GC] Properly handle packed field truncation in StructNew
 (#5570)

---
 src/wasm-interpreter.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

(limited to 'src')

diff --git a/src/wasm-interpreter.h b/src/wasm-interpreter.h
index 8e82bdf80..afc193f71 100644
--- a/src/wasm-interpreter.h
+++ b/src/wasm-interpreter.h
@@ -1541,14 +1541,15 @@ public:
     const auto& fields = heapType.getStruct().fields;
     Literals data(fields.size());
     for (Index i = 0; i < fields.size(); i++) {
+      auto& field = fields[i];
       if (curr->isWithDefault()) {
-        data[i] = Literal::makeZero(fields[i].type);
+        data[i] = Literal::makeZero(field.type);
       } else {
         auto value = self()->visit(curr->operands[i]);
         if (value.breaking()) {
           return value;
         }
-        data[i] = value.getSingleValue();
+        data[i] = truncateForPacking(value.getSingleValue(), field);
       }
     }
     return Literal(std::make_shared<GCData>(curr->type.getHeapType(), data),
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