From 8b95c3ebfbd492c2ac863df93e40c11fc2e914fd Mon Sep 17 00:00:00 2001
From: Jim Grosbach <grosbach@apple.com>
Date: Wed, 20 Oct 2010 00:02:50 +0000
Subject: [PATCH] Add dynamic realignment when rematerializing the base
 register.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116886 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/ARMExpandPseudoInsts.cpp | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/lib/Target/ARM/ARMExpandPseudoInsts.cpp b/lib/Target/ARM/ARMExpandPseudoInsts.cpp
index bbfd627a0cf..39d7afa853d 100644
--- a/lib/Target/ARM/ARMExpandPseudoInsts.cpp
+++ b/lib/Target/ARM/ARMExpandPseudoInsts.cpp
@@ -606,6 +606,19 @@ bool ARMExpandPseudo::ExpandMBB(MachineBasicBlock &MBB) {
                                         FramePtr, -NumBytes, ARMCC::AL, 0,
                                         *TII);
         }
+        // If there's dynamic realignment, adjust for it.
+        if (!RI.needsStackRealignment(MF)) {
+          MachineFrameInfo  *MFI = MF.getFrameInfo();
+          unsigned MaxAlign = MFI->getMaxAlignment();
+          assert (!AFI->isThumb1OnlyFunction());
+          // Emit bic r6, r6, MaxAlign
+          unsigned bicOpc = AFI->isThumbFunction() ?
+            ARM::t2BICri : ARM::BICri;
+          AddDefaultCC(AddDefaultPred(BuildMI(MBB, MBBI, MI.getDebugLoc(),
+                                              TII->get(bicOpc), ARM::R6)
+                                      .addReg(ARM::R6, RegState::Kill)
+                                      .addImm(MaxAlign-1)));
+        }
 
       }
       MI.eraseFromParent();
-- 
2.34.1