From 516956a01fee9aa732b199012a6ea0bcc2bd789f Mon Sep 17 00:00:00 2001
From: Carol Eidt <carol.eidt@microsoft.com>
Date: Wed, 5 Feb 2020 08:00:02 -0800
Subject: [PATCH] Account for UpperVector saves in minRegs (#31773)

When we use a jitStressRegs mode that limits the number of registers, we need to account for the UpperVectorSave.

Fix #31727
---
 src/coreclr/src/jit/lsrabuild.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/coreclr/src/jit/lsrabuild.cpp b/src/coreclr/src/jit/lsrabuild.cpp
index 73a3b1b7ba9136..16ca5e288adf3a 100644
--- a/src/coreclr/src/jit/lsrabuild.cpp
+++ b/src/coreclr/src/jit/lsrabuild.cpp
@@ -1627,6 +1627,12 @@ void LinearScan::buildRefPositionsForNode(GenTree* tree, BasicBlock* block, Lsra
                 {
                     minRegCount++;
                 }
+#if FEATURE_PARTIAL_SIMD_CALLEE_SAVE
+                else if (newRefPosition->refType == RefTypeUpperVectorSave)
+                {
+                    minRegCount++;
+                }
+#endif
                 if (newRefPosition->getInterval()->isSpecialPutArg)
                 {
                     minRegCount++;