From 3f1d8fdd33af8241bbd0ee0a2fa9d0d31eccd787 Mon Sep 17 00:00:00 2001
From: Matthias Braun <matze@braunis.de>
Date: Wed, 10 Dec 2014 01:12:10 +0000
Subject: LiveInterval: Add support to track liveness of subregisters.

This code adds the required data structures. Algorithms to compute it follow.

llvm-svn: 223877
---
 llvm/lib/CodeGen/LiveIntervalAnalysis.cpp | 2 ++
 1 file changed, 2 insertions(+)

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

diff --git a/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp b/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp
index 1742e63b0df..d07d3cc3a8a 100644
--- a/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp
+++ b/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp
@@ -767,6 +767,8 @@ public:
         continue;
       if (TargetRegisterInfo::isVirtualRegister(Reg)) {
         LiveInterval &LI = LIS.getInterval(Reg);
+        // TODO: handle subranges instead of dropping them
+        LI.clearSubRanges();
         updateRange(LI, Reg);
         continue;
       }
-- 
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