From: Evan Cheng <evan.cheng@apple.com>
Date: Tue, 1 May 2007 00:47:46 +0000 (+0000)
Subject: Added hook hasReservedCallFrame(). It returns true if the call frame is
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=14f1dd120fc13200697560680999c0efe7ecd714;p=oota-llvm.git

Added hook hasReservedCallFrame(). It returns true if the call frame is
included as part of the stack frame.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36606 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/llvm/Target/MRegisterInfo.h b/include/llvm/Target/MRegisterInfo.h
index 2db4f2031bd..4b9389accb7 100644
--- a/include/llvm/Target/MRegisterInfo.h
+++ b/include/llvm/Target/MRegisterInfo.h
@@ -451,6 +451,15 @@ public:
   /// variable sized allocas or if frame pointer elimination is disabled.
   virtual bool hasFP(const MachineFunction &MF) const = 0;
 
+  // hasReservedCallFrame - Under normal circumstances, when a frame pointer is
+  // not required, we reserve argument space for call sites in the function
+  // immediately on entry to the current function. This eliminates the need for
+  // add/sub sp brackets around call sites. Returns true if the call frame is
+  // included as part of the stack frame.
+  virtual bool hasReservedCallFrame(MachineFunction &MF) const {
+    return !hasFP(MF);
+  }
+
   /// getCallFrameSetup/DestroyOpcode - These methods return the opcode of the
   /// frame setup/destroy instructions if they exist (-1 otherwise).  Some
   /// targets use pseudo instructions in order to abstract away the difference