From 90bd0636c49f1c88136871c6d76b0e5702349940 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pawe=C5=82=20Bylica?= <chfast@gmail.com>
Date: Thu, 1 Oct 2020 13:34:04 +0200
Subject: [PATCH] Optimize call result push to the stack

---
 lib/fizzy/execute.cpp | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/lib/fizzy/execute.cpp b/lib/fizzy/execute.cpp
index 1992d720d..1650a24e8 100644
--- a/lib/fizzy/execute.cpp
+++ b/lib/fizzy/execute.cpp
@@ -524,12 +524,10 @@ inline bool invoke_function(const FuncType& func_type, uint32_t func_idx, Instan
 
     stack.drop(num_args);
 
-    const auto num_outputs = func_type.outputs.size();
-    // NOTE: we can assume these two from validation
-    assert(num_outputs <= 1);
-    assert(ret.has_value == (num_outputs == 1));
+    // NOTE: validation ensures there is at most 1 output value
+    assert(func_type.outputs.size() == (ret.has_value ? 1 : 0));
     // Push back the result
-    if (num_outputs != 0)
+    if (ret.has_value)
         stack.push(ret.value);
 
     return true;