From 0c91b93d2bd9e402e6dd405837217fc9c7cf1caf Mon Sep 17 00:00:00 2001
From: Steven Wu <stevenwu@apple.com>
Date: Fri, 21 Mar 2025 11:05:14 -0700
Subject: [PATCH] [IRGenModule] Fix hash function for FixedLayoutKey

`bitwiseTakable` is not a boolean value and has more than binary value.
Don't hash it as bool as it can cause unnecessary hash collision.
---
 lib/IRGen/IRGenModule.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/IRGen/IRGenModule.h b/lib/IRGen/IRGenModule.h
index d356799379e49..660bc8e36a6b5 100644
--- a/lib/IRGen/IRGenModule.h
+++ b/lib/IRGen/IRGenModule.h
@@ -2078,7 +2078,7 @@ struct DenseMapInfo<swift::irgen::IRGenModule::FixedLayoutKey> {
 
   static unsigned getHashValue(const FixedLayoutKey &key) {
     return hash_combine(key.size, key.numExtraInhabitants, key.align,
-                        (bool)key.pod, (bool)key.bitwiseTakable);
+                        (bool)key.pod, key.bitwiseTakable);
   }
   static bool isEqual(const FixedLayoutKey &a, const FixedLayoutKey &b) {
     return a.size == b.size