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annotate lib/Target/Hexagon/HexagonTargetTransformInfo.cpp @ 120:1172e4bd9c6f

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update 4.0.0
author mir3636
date Fri, 25 Nov 2016 19:14:25 +0900
parents afa8332a0e37
children 803732b1fca8
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1 //===-- HexagonTargetTransformInfo.cpp - Hexagon specific TTI pass --------===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 /// \file
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9 /// This file implements a TargetTransformInfo analysis pass specific to the
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10 /// Hexagon target machine. It uses the target's detailed information to provide
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11 /// more precise answers to certain TTI queries, while letting the target
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12 /// independent and default TTI implementations handle the rest.
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13 ///
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14 //===----------------------------------------------------------------------===//
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15
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16 #include "HexagonTargetTransformInfo.h"
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17 #include "llvm/IR/Instructions.h"
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18 #include "llvm/Support/Debug.h"
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19
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20 using namespace llvm;
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21
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22 #define DEBUG_TYPE "hexagontti"
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23
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24 TargetTransformInfo::PopcntSupportKind
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25 HexagonTTIImpl::getPopcntSupport(unsigned IntTyWidthInBit) const {
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26 // Return Fast Hardware support as every input < 64 bits will be promoted
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27 // to 64 bits.
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28 return TargetTransformInfo::PSK_FastHardware;
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29 }
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30
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31 // The Hexagon target can unroll loops with run-time trip counts.
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32 void HexagonTTIImpl::getUnrollingPreferences(Loop *L,
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33 TTI::UnrollingPreferences &UP) {
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34 UP.Runtime = UP.Partial = true;
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35 }
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36
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37 unsigned HexagonTTIImpl::getNumberOfRegisters(bool vector) const {
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38 return vector ? 0 : 32;
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39 }
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40
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41 unsigned HexagonTTIImpl::getPrefetchDistance() const {
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42 return getST()->getL1PrefetchDistance();
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43 }
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44
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45 unsigned HexagonTTIImpl::getCacheLineSize() const {
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46 return getST()->getL1CacheLineSize();
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47 }
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48
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49 int HexagonTTIImpl::getUserCost(const User *U) {
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50 auto isCastFoldedIntoLoad = [] (const CastInst *CI) -> bool {
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51 if (!CI->isIntegerCast())
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52 return false;
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53 const LoadInst *LI = dyn_cast<const LoadInst>(CI->getOperand(0));
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54 // Technically, this code could allow multiple uses of the load, and
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55 // check if all the uses are the same extension operation, but this
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56 // should be sufficient for most cases.
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57 if (!LI || !LI->hasOneUse())
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58 return false;
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59
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60 // Only extensions from an integer type shorter than 32-bit to i32
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61 // can be folded into the load.
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62 unsigned SBW = CI->getSrcTy()->getIntegerBitWidth();
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63 unsigned DBW = CI->getDestTy()->getIntegerBitWidth();
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64 return DBW == 32 && (SBW < DBW);
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65 };
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66
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67 if (const CastInst *CI = dyn_cast<const CastInst>(U))
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68 if (isCastFoldedIntoLoad(CI))
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69 return TargetTransformInfo::TCC_Free;
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70 return BaseT::getUserCost(U);
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71 }