Seperate code out of TargetMachine into MachineInstrInfo

llvm-svn: 4368

1 files changed, 56 insertions, 0 deletions

diff --git a/llvm/lib/Target/TargetInstrInfo.cpp b/llvm/lib/Target/TargetInstrInfo.cpp
new file mode 100644
index 00000000000..ca26718708e
--- /dev/null
+++ b/llvm/lib/Target/TargetInstrInfo.cpp
@@ -0,0 +1,56 @@
+//===-- TargetMachine.cpp - General Target Information ---------------------==//
+//
+// This file describes the general parts of a Target machine.
+// This file also implements MachineInstrInfo and MachineCacheInfo.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Target/MachineInstrInfo.h"
+#include "llvm/Constant.h"
+#include "llvm/DerivedTypes.h"
+
+//---------------------------------------------------------------------------
+// class MachineInstructionInfo
+//	Interface to description of machine instructions
+//---------------------------------------------------------------------------
+
+
+MachineInstrInfo::MachineInstrInfo(const TargetMachine& tgt,
+                                   const MachineInstrDescriptor* Desc,
+				   unsigned DescSize,
+				   unsigned NumRealOpCodes)
+  : target(tgt), desc(Desc), descSize(DescSize), numRealOpCodes(NumRealOpCodes) {
+  // FIXME: TargetInstrDescriptors should not be global
+  assert(TargetInstrDescriptors == NULL && desc != NULL);
+  TargetInstrDescriptors = desc;	// initialize global variable
+}
+
+MachineInstrInfo::~MachineInstrInfo() {
+  TargetInstrDescriptors = NULL;	// reset global variable
+}
+
+
+bool MachineInstrInfo::constantFitsInImmedField(MachineOpCode opCode,
+                                                int64_t intValue) const {
+  // First, check if opCode has an immed field.
+  bool isSignExtended;
+  uint64_t maxImmedValue = maxImmedConstant(opCode, isSignExtended);
+  if (maxImmedValue != 0)
+    {
+      // NEED TO HANDLE UNSIGNED VALUES SINCE THEY MAY BECOME MUCH
+      // SMALLER AFTER CASTING TO SIGN-EXTENDED int, short, or char.
+      // See CreateUIntSetInstruction in SparcInstrInfo.cpp.
+      
+      // Now check if the constant fits
+      if (intValue <= (int64_t) maxImmedValue &&
+	  intValue >= -((int64_t) maxImmedValue+1))
+	return true;
+    }
+  
+  return false;
+}
+
+bool MachineInstrInfo::ConstantTypeMustBeLoaded(const Constant* CV) const {
+  assert(CV->getType()->isPrimitiveType() || isa<PointerType>(CV->getType()));
+  return !(CV->getType()->isIntegral() || isa<PointerType>(CV->getType()));
+}