From 5a66dfad2a9662cece4f2c52de66ba8ed3c99796 Mon Sep 17 00:00:00 2001
From: Nuno Lopes <nlopes@microsoft.com>
Date: Thu, 27 May 2021 09:38:21 +0100
Subject: [PATCH] change parameter::hash so that the least significant bits
 arent overriden the 3rd bit was being stuck by the parameter kind, leading to
 increased number of hash collisions

---
 src/ast/ast.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/ast/ast.cpp b/src/ast/ast.cpp
index d64cb92de..c564acba3 100644
--- a/src/ast/ast.cpp
+++ b/src/ast/ast.cpp
@@ -102,7 +102,7 @@ unsigned parameter::hash() const {
     case PARAM_ZSTRING:  b = get_zstring().hash(); break;
     case PARAM_EXTERNAL: b = get_ext_id(); break;
     }
-    return (b << 2) | get_kind();
+    return b;
 }
 
 std::ostream& parameter::display(std::ostream& out) const {