[SystemZ] Provide basic TargetTransformInfo implementation

This hooks up the TargetTransformInfo machinery for SystemZ,
and provides an implementation of getIntImmCost.

In addition, the patch adds the isLegalICmpImmediate and
isLegalAddImmediate TargetLowering overrides, and updates
a couple of test cases where we now generate slightly
better code.

llvm-svn: 233688

1 files changed, 68 insertions, 0 deletions

diff --git a/llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.h b/llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.h
new file mode 100644
index 00000000000..d96515adce4
--- /dev/null
+++ b/llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.h
@@ -0,0 +1,68 @@
+//===-- SystemZTargetTransformInfo.h - SystemZ-specific TTI ---------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZTARGETTRANSFORMINFO_H
+#define LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZTARGETTRANSFORMINFO_H
+
+#include "SystemZTargetMachine.h"
+#include "llvm/Analysis/TargetTransformInfo.h"
+#include "llvm/CodeGen/BasicTTIImpl.h"
+
+namespace llvm {
+
+class SystemZTTIImpl : public BasicTTIImplBase<SystemZTTIImpl> {
+  typedef BasicTTIImplBase<SystemZTTIImpl> BaseT;
+  typedef TargetTransformInfo TTI;
+  friend BaseT;
+
+  const SystemZSubtarget *ST;
+  const SystemZTargetLowering *TLI;
+
+  const SystemZSubtarget *getST() const { return ST; }
+  const SystemZTargetLowering *getTLI() const { return TLI; }
+
+public:
+  explicit SystemZTTIImpl(const SystemZTargetMachine *TM, Function &F)
+    : BaseT(TM), ST(TM->getSubtargetImpl(F)), TLI(ST->getTargetLowering()) {}
+
+  // Provide value semantics. MSVC requires that we spell all of these out.
+  SystemZTTIImpl(const SystemZTTIImpl &Arg)
+      : BaseT(static_cast<const BaseT &>(Arg)), ST(Arg.ST), TLI(Arg.TLI) {}
+  SystemZTTIImpl(SystemZTTIImpl &&Arg)
+      : BaseT(std::move(static_cast<BaseT &>(Arg))), ST(std::move(Arg.ST)),
+        TLI(std::move(Arg.TLI)) {}
+  SystemZTTIImpl &operator=(const SystemZTTIImpl &RHS) {
+    BaseT::operator=(static_cast<const BaseT &>(RHS));
+    ST = RHS.ST;
+    TLI = RHS.TLI;
+    return *this;
+  }
+  SystemZTTIImpl &operator=(SystemZTTIImpl &&RHS) {
+    BaseT::operator=(std::move(static_cast<BaseT &>(RHS)));
+    ST = std::move(RHS.ST);
+    TLI = std::move(RHS.TLI);
+    return *this;
+  }
+
+  /// \name Scalar TTI Implementations
+  /// @{
+
+  unsigned getIntImmCost(const APInt &Imm, Type *Ty);
+
+  unsigned getIntImmCost(unsigned Opcode, unsigned Idx, const APInt &Imm,
+                         Type *Ty);
+  unsigned getIntImmCost(Intrinsic::ID IID, unsigned Idx, const APInt &Imm,
+                         Type *Ty);
+
+  /// @}
+};
+
+} // end namespace llvm
+
+#endif