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-rw-r--r--lib/Target/X86/X86MachineFunctionInfo.cpp19
1 files changed, 19 insertions, 0 deletions
diff --git a/lib/Target/X86/X86MachineFunctionInfo.cpp b/lib/Target/X86/X86MachineFunctionInfo.cpp
index 568dc22..ac2cdc8 100644
--- a/lib/Target/X86/X86MachineFunctionInfo.cpp
+++ b/lib/Target/X86/X86MachineFunctionInfo.cpp
@@ -8,7 +8,26 @@
//===----------------------------------------------------------------------===//
#include "X86MachineFunctionInfo.h"
+#include "X86RegisterInfo.h"
+#include "llvm/Target/TargetSubtargetInfo.h"
using namespace llvm;
void X86MachineFunctionInfo::anchor() { }
+
+void X86MachineFunctionInfo::setRestoreBasePointer(const MachineFunction *MF) {
+ if (!RestoreBasePointerOffset) {
+ const X86RegisterInfo *RegInfo = static_cast<const X86RegisterInfo *>(
+ MF->getSubtarget().getRegisterInfo());
+ unsigned SlotSize = RegInfo->getSlotSize();
+ for (const MCPhysReg *CSR =
+ RegInfo->X86RegisterInfo::getCalleeSavedRegs(MF);
+ unsigned Reg = *CSR;
+ ++CSR)
+ {
+ if (X86::GR64RegClass.contains(Reg) || X86::GR32RegClass.contains(Reg))
+ RestoreBasePointerOffset -= SlotSize;
+ }
+ }
+}
+