From ea382d21d6c1b8d6393b278e2c7d94507f7f78a3 Mon Sep 17 00:00:00 2001
From: Jakob Botsch Nielsen <jakob.botsch.nielsen@gmail.com>
Date: Thu, 1 Aug 2024 22:47:20 +0200
Subject: [PATCH] JIT: Clear register assignment after defining trees used from
 spill temps

Fix #105837
---
 src/coreclr/jit/codegenlinear.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/coreclr/jit/codegenlinear.cpp b/src/coreclr/jit/codegenlinear.cpp
index 1f0ede80c7a8a2..27040f7dd1d0b8 100644
--- a/src/coreclr/jit/codegenlinear.cpp
+++ b/src/coreclr/jit/codegenlinear.cpp
@@ -2148,6 +2148,12 @@ void CodeGen::genProduceReg(GenTree* tree)
             tree->gtFlags |= GTF_SPILLED;
             tree->gtFlags &= ~GTF_SPILL;
 
+            if (tree->isUsedFromSpillTemp())
+            {
+                // The register assignment is not meaningful for the use.
+                tree->ClearRegNum();
+            }
+
             return;
         }
     }