From ca873eade187c0ad81335581a2b1c0c39ac53e07 Mon Sep 17 00:00:00 2001
From: SingleAccretion <62474226+SingleAccretion@users.noreply.github.com>
Date: Thu, 15 Dec 2022 20:00:10 +0300
Subject: [PATCH] Do not avoid LCL_FLDs for indirectly accessed locals (#77980)

They will have to be DNERed anyway.
---
 src/coreclr/jit/morphblock.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/coreclr/jit/morphblock.cpp b/src/coreclr/jit/morphblock.cpp
index 02394178baea7..3dc11df1a66bf 100644
--- a/src/coreclr/jit/morphblock.cpp
+++ b/src/coreclr/jit/morphblock.cpp
@@ -843,8 +843,10 @@ void MorphCopyBlockHelper::MorphStructCases()
     //
     bool requiresCopyBlock = false;
 
-    // If either src or dest is a reg-sized non-field-addressed struct, keep the copyBlock.
-    if ((m_dstVarDsc != nullptr && m_dstVarDsc->lvRegStruct) || (m_srcVarDsc != nullptr && m_srcVarDsc->lvRegStruct))
+    // If either src or dest is a reg-sized non-field-addressed struct, keep the copyBlock;
+    // this will avoid having to DNER the enregisterable local when creating LCL_FLD nodes.
+    if ((m_dst->OperIs(GT_LCL_VAR) && m_dstVarDsc->lvRegStruct) ||
+        (m_src->OperIs(GT_LCL_VAR) && m_srcVarDsc->lvRegStruct))
     {
         requiresCopyBlock = true;
     }