From 61ef8c09052bd6e6eaee9e03c595ff2d0a84aca9 Mon Sep 17 00:00:00 2001
From: SingleAccretion <AccretionMail@yandex.ru>
Date: Tue, 23 Nov 2021 23:25:14 +0300
Subject: [PATCH] Update hash of the new CSE when resizing

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 77eec238411812..b6dadaac185771 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;