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annotate lib/Target/Hexagon/HexagonTargetTransformInfo.cpp @ 95:afa8332a0e37 LLVM3.8

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LLVM 3.8
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Tue, 13 Oct 2015 17:48:58 +0900
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children 1172e4bd9c6f
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95
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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/Support/Debug.h"
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18
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19 using namespace llvm;
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20
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21 #define DEBUG_TYPE "hexagontti"
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22
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23 TargetTransformInfo::PopcntSupportKind
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24 HexagonTTIImpl::getPopcntSupport(unsigned IntTyWidthInBit) const {
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25 // Return Fast Hardware support as every input < 64 bits will be promoted
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26 // to 64 bits.
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27 return TargetTransformInfo::PSK_FastHardware;
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28 }
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29
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30 // The Hexagon target can unroll loops with run-time trip counts.
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31 void HexagonTTIImpl::getUnrollingPreferences(Loop *L,
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32 TTI::UnrollingPreferences &UP) {
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33 UP.Runtime = UP.Partial = true;
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34 }
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35
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36 unsigned HexagonTTIImpl::getNumberOfRegisters(bool vector) const {
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37 return vector ? 0 : 32;
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38 }