Seperate code out of TargetMachine into MachineInstrInfo
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4368 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/TargetInstrInfo.cpp b/lib/Target/TargetInstrInfo.cpp
new file mode 100644
index 0000000..ca26718
--- /dev/null
+++ b/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()));
+}