From: Dan Gohman <gohman@apple.com>
Date: Thu, 18 Dec 2008 22:01:52 +0000 (+0000)
Subject: When setting up the frame pointer, add it as a live-in register to all
X-Git-Tag: android-x86-6.0-r1~1047^2~16766
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=85ad18c3ed11de23cf1ca234ffac8aab3a97576d;p=android-x86%2Fexternal-llvm.git

When setting up the frame pointer, add it as a live-in register to all
non-entry blocks, so that it doesn't appear use-before-def anywhere.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61214 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/X86/X86RegisterInfo.cpp b/lib/Target/X86/X86RegisterInfo.cpp
index 4bdfd8c101d..4f4a33db74b 100644
--- a/lib/Target/X86/X86RegisterInfo.cpp
+++ b/lib/Target/X86/X86RegisterInfo.cpp
@@ -745,6 +745,11 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
     BuildMI(MBB, MBBI, TII.get(Is64Bit ? X86::MOV64rr : X86::MOV32rr), FramePtr)
       .addReg(StackPtr);
 
+    // Mark the FramePtr as live-in in every block except the entry.
+    for (MachineFunction::iterator I = next(MF.begin()), E = MF.end();
+         I != E; ++I)
+      I->addLiveIn(FramePtr);
+
     // Realign stack
     if (needsStackRealignment(MF))
       BuildMI(MBB, MBBI,