From 4e94e25c9024d01451e318fe48aee79b615e9c2b Mon Sep 17 00:00:00 2001
From: Markus Lavin <markus.lavin@ericsson.com>
Date: Thu, 11 Nov 2021 15:27:15 +0100
Subject: Fix minor deficiency in machine-sink.

Register uses that are MRI->isConstantPhysReg() should not inhibit
sinking transformation.

Reviewed By: StephenTozer

Differential Revision: https://reviews.llvm.org/D111531
---
 llvm/lib/CodeGen/MachineSink.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'llvm/lib/CodeGen/MachineSink.cpp')

diff --git a/llvm/lib/CodeGen/MachineSink.cpp b/llvm/lib/CodeGen/MachineSink.cpp
index 4ea8bb4..30745c7 100644
--- a/llvm/lib/CodeGen/MachineSink.cpp
+++ b/llvm/lib/CodeGen/MachineSink.cpp
@@ -1324,7 +1324,8 @@ bool MachineSinking::SinkInstruction(MachineInstr &MI, bool &SawStore,
   // "zombie" define of that preg. E.g., EFLAGS. (<rdar://problem/8030636>)
   for (unsigned I = 0, E = MI.getNumOperands(); I != E; ++I) {
     const MachineOperand &MO = MI.getOperand(I);
-    if (!MO.isReg()) continue;
+    if (!MO.isReg() || MO.isUse())
+      continue;
     Register Reg = MO.getReg();
     if (Reg == 0 || !Register::isPhysicalRegister(Reg))
       continue;
-- 
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