[llvm] r180080 - AArch64: remove unnecessary check that RS is valid

[Tim Northover]

Author: tnorthover
Date: Tue Apr 23 01:55:15 2013
New Revision: 180080

URL: http://llvm.org/viewvc/llvm-project?rev=180080&view=rev
Log:
AArch64: remove unnecessary check that RS is valid

AArch64 always demands a register-scavenger, so the pointer should never be
NULL. However, in the spirit of paranoia, we'll assert it before use just in
case.

Modified:
    llvm/trunk/lib/Target/AArch64/AArch64FrameLowering.cpp

Modified: llvm/trunk/lib/Target/AArch64/AArch64FrameLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/AArch64/AArch64FrameLowering.cpp?rev=180080&r1=180079&r2=180080&view=diff
==============================================================================
--- llvm/trunk/lib/Target/AArch64/AArch64FrameLowering.cpp (original)
+++ llvm/trunk/lib/Target/AArch64/AArch64FrameLowering.cpp Tue Apr 23 01:55:15 2013
@@ -367,9 +367,8 @@ AArch64FrameLowering::processFunctionBef
   // shoving a base register and an offset into the instruction then we may well
   // need to scavenge registers. We should either specifically add an
   // callee-save register for this purpose or allocate an extra spill slot.
-
   bool BigStack =
-    (RS && MFI->estimateStackSize(MF) >= TII.estimateRSStackLimit(MF))
+    MFI->estimateStackSize(MF) >= TII.estimateRSStackLimit(MF)
     || MFI->hasVarSizedObjects() // Access will be from X29: messes things up
     || (MFI->adjustsStack() && !hasReservedCallFrame(MF));
 
@@ -392,6 +391,8 @@ AArch64FrameLowering::processFunctionBef
   if (ExtraReg != 0) {
     MF.getRegInfo().setPhysRegUsed(ExtraReg);
   } else {
+    assert(RS && "Expect register scavenger to be available");
+
     // Create a stack slot for scavenging purposes. PrologEpilogInserter
     // helpfully places it near either SP or FP for us to avoid
     // infinitely-regression during scavenging.