From d9a578934827ec7792407b37852b1eb8fbf2b19b Mon Sep 17 00:00:00 2001
From: SingleAccretion <62474226+SingleAccretion@users.noreply.github.com>
Date: Mon, 29 Nov 2021 15:29:52 +0300
Subject: [PATCH] Update hash of the new CSE when resizing (#61984)

The CSE logic maintains a custom hashtable implementation.

It triggers a resize at the same time as adding a new CSE,
but forgets the hash of the new CSE needs to be updated from
its pre-resize value. Failing to do so can lead to losing some
CSEs, though not in a correctness-impacting way.
---
 src/coreclr/jit/optcse.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/coreclr/jit/optcse.cpp b/src/coreclr/jit/optcse.cpp
index 77eec23841181..b6dadaac18577 100644
--- a/src/coreclr/jit/optcse.cpp
+++ b/src/coreclr/jit/optcse.cpp
@@ -655,6 +655,7 @@ unsigned Compiler::optValnumCSE_Index(GenTree* tree, Statement* stmt)
                     }
                 }
 
+                hval                           = optCSEKeyToHashIndex(key, newOptCSEhashSize);
                 optCSEhash                     = newOptCSEhash;
                 optCSEhashSize                 = newOptCSEhashSize;
                 optCSEhashMaxCountBeforeResize = optCSEhashMaxCountBeforeResize * s_optCSEhashGrowthFactor;