[llvm-commits] [llvm] r61214 - /llvm/trunk/lib/Target/X86/X86RegisterInfo.cpp

[Dan Gohman]

Author: djg
Date: Thu Dec 18 16:01:52 2008
New Revision: 61214

URL: http://llvm.org/viewvc/llvm-project?rev=61214&view=rev
Log:
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.

Modified:
    llvm/trunk/lib/Target/X86/X86RegisterInfo.cpp

Modified: llvm/trunk/lib/Target/X86/X86RegisterInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86RegisterInfo.cpp?rev=61214&r1=61213&r2=61214&view=diff

==============================================================================
--- llvm/trunk/lib/Target/X86/X86RegisterInfo.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86RegisterInfo.cpp Thu Dec 18 16:01:52 2008
@@ -745,6 +745,11 @@
     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,