From befae81fa2559a7cefa8fe6227149c6147e1eb2f Mon Sep 17 00:00:00 2001
From: wdx727 <wudexin@kuaishou.com>
Date: Sun, 2 Nov 2025 12:55:08 +0800
Subject: Fix the usage issue of getRegMask. (#141215)

In the process of determining whether two MachineOperands are equal and
calculating the hash of a MachineOperand, both MO_RegisterMask and
MO_RegisterLiveOut types were uniformly handled. However, when the type
is MO_RegisterLiveOut, calling getRegMask() triggers an assertion
failure. This PR addresses this issue.
---
 llvm/lib/CodeGen/MachineStableHash.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

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

diff --git a/llvm/lib/CodeGen/MachineStableHash.cpp b/llvm/lib/CodeGen/MachineStableHash.cpp
index 9d56696..6da708d 100644
--- a/llvm/lib/CodeGen/MachineStableHash.cpp
+++ b/llvm/lib/CodeGen/MachineStableHash.cpp
@@ -136,7 +136,8 @@ stable_hash llvm::stableHashValue(const MachineOperand &MO) {
           const TargetRegisterInfo *TRI = MF->getSubtarget().getRegisterInfo();
           unsigned RegMaskSize =
               MachineOperand::getRegMaskSize(TRI->getNumRegs());
-          const uint32_t *RegMask = MO.getRegMask();
+          const uint32_t *RegMask =
+              MO.isRegMask() ? MO.getRegMask() : MO.getRegLiveOut();
           std::vector<llvm::stable_hash> RegMaskHashes(RegMask,
                                                        RegMask + RegMaskSize);
           return stable_hash_combine(MO.getType(), MO.getTargetFlags(),
-- 
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