From 8077e76f934d575437a55315a0d5fcdcab6d6608 Mon Sep 17 00:00:00 2001
From: Jim Grosbach <grosbach@apple.com>
Date: Mon, 7 Jun 2010 21:48:47 +0000
Subject: [PATCH] Handle dbg_value instructions (i.e., skip them) when
 generating IT blocks. rdar://7797940

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105557 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/Thumb2ITBlockPass.cpp | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/lib/Target/ARM/Thumb2ITBlockPass.cpp b/lib/Target/ARM/Thumb2ITBlockPass.cpp
index f36d4ef7567..065f657f5d6 100644
--- a/lib/Target/ARM/Thumb2ITBlockPass.cpp
+++ b/lib/Target/ARM/Thumb2ITBlockPass.cpp
@@ -71,8 +71,10 @@ bool Thumb2ITBlockPass::InsertITBlocks(MachineBasicBlock &MBB) {
     unsigned Mask = 0, Pos = 3;
     // Branches, including tricky ones like LDM_RET, need to end an IT
     // block so check the instruction we just put in the block.
-    while (MBBI != E && Pos &&
-           (!MI->getDesc().isBranch() && !MI->getDesc().isReturn())) {
+    for (; MBBI != E && Pos &&
+           (!MI->getDesc().isBranch() && !MI->getDesc().isReturn()) ; ++MBBI) {
+      if (MBBI->isDebugValue())
+        continue;
       MachineInstr *NMI = &*MBBI;
       MI = NMI;
       DebugLoc ndl = NMI->getDebugLoc();
@@ -83,7 +85,6 @@ bool Thumb2ITBlockPass::InsertITBlocks(MachineBasicBlock &MBB) {
       else
         break;
       --Pos;
-      ++MBBI;
     }
     Mask |= (1 << Pos);
     // Tag along (firstcond[0] << 4) with the mask.