From 078e007c07b76ee871fa5dc9e8f8b17199766b41 Mon Sep 17 00:00:00 2001
From: Anton Korobeynikov <asl@math.spbu.ru>
Date: Thu, 16 Jul 2009 14:09:04 +0000
Subject: [PATCH] We already have reserved call frame regardless whether
 variable sized frame objects were present or not

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75987 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/SystemZ/SystemZRegisterInfo.cpp | 15 ---------------
 lib/Target/SystemZ/SystemZRegisterInfo.h   |  2 +-
 2 files changed, 1 insertion(+), 16 deletions(-)

diff --git a/lib/Target/SystemZ/SystemZRegisterInfo.cpp b/lib/Target/SystemZ/SystemZRegisterInfo.cpp
index fe116b6f790..c30d5efd4bf 100644
--- a/lib/Target/SystemZ/SystemZRegisterInfo.cpp
+++ b/lib/Target/SystemZ/SystemZRegisterInfo.cpp
@@ -76,24 +76,9 @@ bool SystemZRegisterInfo::hasFP(const MachineFunction &MF) const {
   return NoFramePointerElim || MFI->hasVarSizedObjects();
 }
 
-bool SystemZRegisterInfo::hasReservedCallFrame(MachineFunction &MF) const {
-  // FIXME: Should we always have reserved call frame?
-  return !MF.getFrameInfo()->hasVarSizedObjects();
-}
-
 void SystemZRegisterInfo::
 eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
                               MachineBasicBlock::iterator I) const {
-  if (!hasReservedCallFrame(MF)) {
-    // If the stack pointer can be changed after prologue, turn the
-    // adjcallstackup instruction into a 'sub R15, <amt>' and the
-    // adjcallstackdown instruction into 'add R15, <amt>'
-    MachineInstr *Old = I;
-    uint64_t Amount = Old->getOperand(0).getImm();
-
-    assert((Amount == 0) && "Not implemented yet!");
-  }
-
   MBB.erase(I);
 }
 
diff --git a/lib/Target/SystemZ/SystemZRegisterInfo.h b/lib/Target/SystemZ/SystemZRegisterInfo.h
index 9430c874636..60ea036ed6f 100644
--- a/lib/Target/SystemZ/SystemZRegisterInfo.h
+++ b/lib/Target/SystemZ/SystemZRegisterInfo.h
@@ -46,7 +46,7 @@ struct SystemZRegisterInfo : public SystemZGenRegisterInfo {
 
   BitVector getReservedRegs(const MachineFunction &MF) const;
 
-  bool hasReservedCallFrame(MachineFunction &MF) const;
+  bool hasReservedCallFrame(MachineFunction &MF) const { return true; }
   bool hasFP(const MachineFunction &MF) const;
 
   int getFrameIndexOffset(MachineFunction &MF, int FI) const;