[llvm-commits] CVS: llvm/lib/Target/X86/X86RegisterInfo.cpp X86RegisterInfo.h

[Evan Cheng]

Changes in directory llvm/lib/Target/X86:

X86RegisterInfo.cpp updated: 1.200 -> 1.201
X86RegisterInfo.h updated: 1.45 -> 1.46
---
Log message:

Added getReservedRegs().

---
Diffs of the changes:  (+22 -0)

 X86RegisterInfo.cpp |   16 ++++++++++++++++
 X86RegisterInfo.h   |    6 ++++++
 2 files changed, 22 insertions(+)


Index: llvm/lib/Target/X86/X86RegisterInfo.cpp
diff -u llvm/lib/Target/X86/X86RegisterInfo.cpp:1.200 llvm/lib/Target/X86/X86RegisterInfo.cpp:1.201
--- llvm/lib/Target/X86/X86RegisterInfo.cpp:1.200	Mon Jan 29 17:20:22 2007
+++ llvm/lib/Target/X86/X86RegisterInfo.cpp	Sat Feb 17 05:06:00 2007
@@ -31,6 +31,7 @@
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Target/TargetOptions.h"
 #include "llvm/Support/CommandLine.h"
+#include "llvm/ADT/BitVector.h"
 #include "llvm/ADT/STLExtras.h"
 using namespace llvm;
 
@@ -883,6 +884,21 @@
   return Is64Bit ? CalleeSavedRegClasses64Bit : CalleeSavedRegClasses32Bit;
 }
 
+BitVector X86RegisterInfo::getReservedRegs(const MachineFunction &MF) const {
+  BitVector Reserved(getNumRegs());
+  Reserved.set(X86::RSP);
+  Reserved.set(X86::ESP);
+  Reserved.set(X86::SP);
+  Reserved.set(X86::SPL);
+  if (hasFP(MF)) {
+    Reserved.set(X86::RBP);
+    Reserved.set(X86::EBP);
+    Reserved.set(X86::BP);
+    Reserved.set(X86::BPL);
+  }
+  return Reserved;
+}
+
 //===----------------------------------------------------------------------===//
 // Stack Frame Processing methods
 //===----------------------------------------------------------------------===//


Index: llvm/lib/Target/X86/X86RegisterInfo.h
diff -u llvm/lib/Target/X86/X86RegisterInfo.h:1.45 llvm/lib/Target/X86/X86RegisterInfo.h:1.46
--- llvm/lib/Target/X86/X86RegisterInfo.h:1.45	Wed Jan 24 13:15:24 2007
+++ llvm/lib/Target/X86/X86RegisterInfo.h	Sat Feb 17 05:06:00 2007
@@ -78,6 +78,12 @@
   /// length of this list match the getCalleeSavedRegs() list.
   const TargetRegisterClass* const* getCalleeSavedRegClasses() const;
 
+  /// getReservedRegs - Returns a bitset indexed by physical register number
+  /// indicating if a register is a special register that has particular uses and
+  /// should be considered unavailable at all times, e.g. SP, RA. This is used by
+  /// register scavenger to determine what registers are free.
+  BitVector getReservedRegs(const MachineFunction &MF) const;
+
   bool hasFP(const MachineFunction &MF) const;
 
   void eliminateCallFramePseudoInstr(MachineFunction &MF,