[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 01716c3cca505e77ca229b096887c82c45985cca..bd2af16121035da52c38d991693fd816b6c45880 100644 (file)
--- 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)