switch a private implementation of GetFunctionSizeInBytes.

This is probably not the best way to implement "Force LR to
be spilled if the Thumb function size is > 2048." do this,
it should use the branch shortening infrastructure, but I'm
just preserving functionality here.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109165 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/ARM/ARMBaseRegisterInfo.cpp b/lib/Target/ARM/ARMBaseRegisterInfo.cpp
index 29b8fd430796eca7cddd241669edc0e8f51571f2..31439b4a267cbbd5b674ab0295daa79bf31b24eb 100644 (file)
--- a/lib/Target/ARM/ARMBaseRegisterInfo.cpp
+++ b/lib/Target/ARM/ARMBaseRegisterInfo.cpp
@@ -723,6 +723,19 @@ ARMBaseRegisterInfo::estimateRSStackSizeLimit(MachineFunction &MF) const {
   return Limit;
 }
 
   return Limit;
 }
 

+static unsigned GetFunctionSizeInBytes(const MachineFunction &MF,
+                                       const ARMBaseInstrInfo &TII) {
+  unsigned FnSize = 0;
+  for (MachineFunction::const_iterator MBBI = MF.begin(), E = MF.end();
+       MBBI != E; ++MBBI) {
+    const MachineBasicBlock &MBB = *MBBI;
+    for (MachineBasicBlock::const_iterator I = MBB.begin(),E = MBB.end();
+         I != E; ++I)
+      FnSize += TII.GetInstSizeInBytes(I);
+  }
+  return FnSize;
+}
+

 void
 ARMBaseRegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
                                                        RegScavenger *RS) const {
 void
 ARMBaseRegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
                                                        RegScavenger *RS) const {


@@ -820,7 +833,7 @@ ARMBaseRegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
 
   bool ForceLRSpill = false;
   if (!LRSpilled && AFI->isThumb1OnlyFunction()) {
 
   bool ForceLRSpill = false;
   if (!LRSpilled && AFI->isThumb1OnlyFunction()) {

-    unsigned FnSize = TII.GetFunctionSizeInBytes(MF);
+    unsigned FnSize = GetFunctionSizeInBytes(MF, TII);

     // Force LR to be spilled if the Thumb function size is > 2048. This enables
     // use of BL to implement far jump. If it turns out that it's not needed
     // then the branch fix up path will undo it.
     // Force LR to be spilled if the Thumb function size is > 2048. This enables
     // use of BL to implement far jump. If it turns out that it's not needed
     // then the branch fix up path will undo it.