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      1 //===-- XCoreTargetTransformInfo.cpp - XCore specific TTI pass ----------------===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is distributed under the University of Illinois Open Source
      6 // License. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 /// \file
     10 /// This file implements a TargetTransformInfo analysis pass specific to the
     11 /// XCore target machine. It uses the target's detailed information to provide
     12 /// more precise answers to certain TTI queries, while letting the target
     13 /// independent and default TTI implementations handle the rest.
     14 ///
     15 //===----------------------------------------------------------------------===//
     16 
     17 #include "XCore.h"
     18 #include "llvm/Analysis/TargetTransformInfo.h"
     19 #include "llvm/Support/Debug.h"
     20 #include "llvm/Target/CostTable.h"
     21 #include "llvm/Target/TargetLowering.h"
     22 using namespace llvm;
     23 
     24 #define DEBUG_TYPE "xcoretti"
     25 
     26 // Declare the pass initialization routine locally as target-specific passes
     27 // don't have a target-wide initialization entry point, and so we rely on the
     28 // pass constructor initialization.
     29 namespace llvm {
     30 void initializeXCoreTTIPass(PassRegistry &);
     31 }
     32 
     33 namespace {
     34 
     35 class XCoreTTI final : public ImmutablePass, public TargetTransformInfo {
     36 public:
     37   XCoreTTI() : ImmutablePass(ID) {
     38     llvm_unreachable("This pass cannot be directly constructed");
     39   }
     40 
     41   XCoreTTI(const XCoreTargetMachine *TM)
     42       : ImmutablePass(ID) {
     43     initializeXCoreTTIPass(*PassRegistry::getPassRegistry());
     44   }
     45 
     46   virtual void initializePass() override {
     47     pushTTIStack(this);
     48   }
     49 
     50   virtual void getAnalysisUsage(AnalysisUsage &AU) const override {
     51     TargetTransformInfo::getAnalysisUsage(AU);
     52   }
     53 
     54   static char ID;
     55 
     56   virtual void *getAdjustedAnalysisPointer(const void *ID) override {
     57     if (ID == &TargetTransformInfo::ID)
     58       return (TargetTransformInfo*)this;
     59     return this;
     60   }
     61 
     62   unsigned getNumberOfRegisters(bool Vector) const override {
     63     if (Vector) {
     64        return 0;
     65     }
     66     return 12;
     67   }
     68 };
     69 
     70 } // end anonymous namespace
     71 
     72 INITIALIZE_AG_PASS(XCoreTTI, TargetTransformInfo, "xcoretti",
     73                    "XCore Target Transform Info", true, true, false)
     74 char XCoreTTI::ID = 0;
     75 
     76 
     77 ImmutablePass *
     78 llvm::createXCoreTargetTransformInfoPass(const XCoreTargetMachine *TM) {
     79   return new XCoreTTI(TM);
     80 }
     81