Pull in r227752 from upstream llvm trunk (by Michael Kuperstein):

  [X86] Convert esp-relative movs of function arguments to pushes, step 2

  This moves the transformation introduced in r223757 into a separate MI pass.
  This allows it to cover many more cases (not only cases where there must be a
  reserved call frame), and perform rudimentary call folding. It still doesn't
  have a heuristic, so it is enabled only for optsize/minsize, with stack
  alignment <= 8, where it ought to be a fairly clear win.

  (Re-commit of r227728)

  Differential Revision: http://reviews.llvm.org/D6789

This helps to get sys/boot/i386/boot2 below the required size again,
when optimizing with -Oz.

1 files changed, 10 insertions, 2 deletions

diff --git a/contrib/llvm/lib/Target/X86/X86MachineFunctionInfo.h b/contrib/llvm/lib/Target/X86/X86MachineFunctionInfo.h
index b23a744..9fd03a7 100644
--- a/contrib/llvm/lib/Target/X86/X86MachineFunctionInfo.h
+++ b/contrib/llvm/lib/Target/X86/X86MachineFunctionInfo.h
@@ -77,6 +77,9 @@ class X86MachineFunctionInfo : public MachineFunctionInfo {
   unsigned ArgumentStackSize;
   /// NumLocalDynamics - Number of local-dynamic TLS accesses.
   unsigned NumLocalDynamics;
+  /// HasPushSequences - Keeps track of whether this function uses sequences
+  /// of pushes to pass function parameters.
+  bool HasPushSequences;
 
 private:
   /// ForwardedMustTailRegParms - A list of virtual and physical registers
@@ -97,7 +100,8 @@ public:
                              VarArgsGPOffset(0),
                              VarArgsFPOffset(0),
                              ArgumentStackSize(0),
-                             NumLocalDynamics(0) {}
+                             NumLocalDynamics(0),
+                             HasPushSequences(false) {}
 
   explicit X86MachineFunctionInfo(MachineFunction &MF)
     : ForceFramePointer(false),
@@ -113,11 +117,15 @@ public:
       VarArgsGPOffset(0),
       VarArgsFPOffset(0),
       ArgumentStackSize(0),
-      NumLocalDynamics(0) {}
+      NumLocalDynamics(0),
+      HasPushSequences(false) {}
 
   bool getForceFramePointer() const { return ForceFramePointer;}
   void setForceFramePointer(bool forceFP) { ForceFramePointer = forceFP; }
 
+  bool getHasPushSequences() const { return HasPushSequences; }
+  void setHasPushSequences(bool HasPush) { HasPushSequences = HasPush; }
+
   bool getRestoreBasePointer() const { return RestoreBasePointerOffset!=0; }
   void setRestoreBasePointer(const MachineFunction *MF);
   int getRestoreBasePointerOffset() const {return RestoreBasePointerOffset; }