From: Quentin Colombet <qcolombet@apple.com>
Date: Fri, 10 Apr 2015 23:14:34 +0000 (+0000)
Subject: [AArch64] Strengthen the code for the prologue insertion.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=b26cf11a7b89c8c77d306a2ebeede00ed81486eb;p=oota-llvm.git

[AArch64] Strengthen the code for the prologue insertion.
The spilled registers are pristine and thus, correctly handled by
the register scavenger and so on, but the liveness information is
strictly speaking wrong at this point.
Fix that.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234664 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/AArch64/AArch64FrameLowering.cpp b/lib/Target/AArch64/AArch64FrameLowering.cpp
index 01716c3cca5..bd2af161210 100644
--- a/lib/Target/AArch64/AArch64FrameLowering.cpp
+++ b/lib/Target/AArch64/AArch64FrameLowering.cpp
@@ -787,6 +787,8 @@ bool AArch64FrameLowering::spillCalleeSavedRegisters(
     if (StrOpc == AArch64::STPDpre || StrOpc == AArch64::STPXpre)
       MIB.addReg(AArch64::SP, RegState::Define);
 
+    MBB.addLiveIn(Reg1);
+    MBB.addLiveIn(Reg2);
     MIB.addReg(Reg2, getPrologueDeath(MF, Reg2))
         .addReg(Reg1, getPrologueDeath(MF, Reg1))
         .addReg(AArch64::SP)