From: Jakob Stoklund Olesen <stoklund@2pi.dk>
Date: Tue, 27 Mar 2012 17:06:06 +0000 (+0000)
Subject: Invalidate liveness in Thumb2ITBlockPass.
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=33fa614b16db175d0687eb34aea3a080d0d237c2;p=oota-llvm.git

Invalidate liveness in Thumb2ITBlockPass.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153516 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/ARM/Thumb2ITBlockPass.cpp b/lib/Target/ARM/Thumb2ITBlockPass.cpp
index ecb4c2f0e5d..e2166ffc322 100644
--- a/lib/Target/ARM/Thumb2ITBlockPass.cpp
+++ b/lib/Target/ARM/Thumb2ITBlockPass.cpp
@@ -15,6 +15,7 @@
 #include "llvm/CodeGen/MachineInstrBuilder.h"
 #include "llvm/CodeGen/MachineInstrBundle.h"
 #include "llvm/CodeGen/MachineFunctionPass.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
 #include "llvm/ADT/SmallSet.h"
 #include "llvm/ADT/Statistic.h"
 using namespace llvm;
@@ -258,6 +259,9 @@ bool Thumb2ITBlockPass::runOnMachineFunction(MachineFunction &Fn) {
   if (!AFI->isThumbFunction())
     return false;
 
+  // IT block insertion invalidates accurate register liveness.
+  Fn.getRegInfo().invalidateLiveness();
+
   bool Modified = false;
   for (MachineFunction::iterator MFI = Fn.begin(), E = Fn.end(); MFI != E; ) {
     MachineBasicBlock &MBB = *MFI;