Optimize trunc instructions implementation

wasmx · Aug 7, 2020 · a3c4df0 · a3c4df0
1 parent a265a7b
commit a3c4df0
Showing 1 changed file with 9 additions and 5 deletions.
diff --git a/lib/fizzy/execute.cpp b/lib/fizzy/execute.cpp
@@ -332,11 +332,15 @@ inline bool trunc(OperandStack& stack) noexcept
     using boundaries = trunc_boundaries<SrcT, DstT>;
 
     const auto input = stack.top().as<SrcT>();
-    if (std::isnan(input) || input <= boundaries::lower || input >= boundaries::upper)
-        return false;
-
-    stack.top() = static_cast<DstT>(input);
-    return true;
+    if (input > boundaries::lower && input < boundaries::upper)
+    {
+        assert(!std::isnan(input));
+        assert(input != std::numeric_limits<SrcT>::infinity());
+        assert(input != -std::numeric_limits<SrcT>::infinity());
+        stack.top() = static_cast<DstT>(input);
+        return true;
+    }
+    return false;
 }
 
 template <typename DstT, typename SrcT = DstT>