1 //===--- InfoByHwMode.cpp -------------------------------------------------===//
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 // Classes that implement data parameterized by HW modes for instruction
10 // selection. Currently it is ValueTypeByHwMode (parameterized ValueType),
11 // and RegSizeInfoByHwMode (parameterized register/spill size and alignment
12 // data).
13 //===----------------------------------------------------------------------===//
14 
15 #include "CodeGenTarget.h"
16 #include "InfoByHwMode.h"
17 #include "llvm/ADT/STLExtras.h"
18 #include "llvm/ADT/Twine.h"
19 #include "llvm/Support/Debug.h"
20 #include "llvm/Support/raw_ostream.h"
21 
22 #include <set>
23 #include <sstream>
24 #include <string>
25 
26 using namespace llvm;
27 
28 std::string llvm::getModeName(unsigned Mode) {
29   if (Mode == DefaultMode)
30     return "*";
31   return (Twine('m') + Twine(Mode)).str();
32 }
33 
34 ValueTypeByHwMode::ValueTypeByHwMode(Record *R, const CodeGenHwModes &CGH) {
35   const HwModeSelect &MS = CGH.getHwModeSelect(R);
36   for (const HwModeSelect::PairType &P : MS.Items) {
37     auto I = Map.insert({P.first, MVT(llvm::getValueType(P.second))});
38     assert(I.second && "Duplicate entry?");
39     (void)I;
40   }
41 }
42 
43 bool ValueTypeByHwMode::operator== (const ValueTypeByHwMode &T) const {
44   assert(isValid() && T.isValid() && "Invalid type in assignment");
45   bool Simple = isSimple();
46   if (Simple != T.isSimple())
47     return false;
48   if (Simple)
49     return getSimple() == T.getSimple();
50 
51   return Map == T.Map;
52 }
53 
54 bool ValueTypeByHwMode::operator< (const ValueTypeByHwMode &T) const {
55   assert(isValid() && T.isValid() && "Invalid type in comparison");
56   // Default order for maps.
57   return Map < T.Map;
58 }
59 
60 MVT &ValueTypeByHwMode::getOrCreateTypeForMode(unsigned Mode, MVT Type) {
61   auto F = Map.find(Mode);
62   if (F != Map.end())
63     return F->second;
64   // If Mode is not in the map, look up the default mode. If it exists,
65   // make a copy of it for Mode and return it.
66   auto D = Map.find(DefaultMode);
67   if (D != Map.end())
68     return Map.insert(std::make_pair(Mode, D->second)).first->second;
69   // If default mode is not present either, use provided Type.
70   return Map.insert(std::make_pair(Mode, Type)).first->second;
71 }
72 
73 StringRef ValueTypeByHwMode::getMVTName(MVT T) {
74   StringRef N = llvm::getEnumName(T.SimpleTy);
75   N.consume_front("MVT::");
76   return N;
77 }
78 
79 void ValueTypeByHwMode::writeToStream(raw_ostream &OS) const {
80   if (isSimple()) {
81     OS << getMVTName(getSimple());
82     return;
83   }
84 
85   std::vector<const PairType*> Pairs;
86   for (const auto &P : Map)
87     Pairs.push_back(&P);
88   std::sort(Pairs.begin(), Pairs.end(), deref<std::less<PairType>>());
89 
90   OS << '{';
91   for (unsigned i = 0, e = Pairs.size(); i != e; ++i) {
92     const PairType *P = Pairs[i];
93     OS << '(' << getModeName(P->first)
94        << ':' << getMVTName(P->second).str() << ')';
95     if (i != e-1)
96       OS << ',';
97   }
98   OS << '}';
99 }
100 
101 LLVM_DUMP_METHOD
102 void ValueTypeByHwMode::dump() const {
103   dbgs() << *this << '\n';
104 }
105 
106 ValueTypeByHwMode llvm::getValueTypeByHwMode(Record *Rec,
107                                              const CodeGenHwModes &CGH) {
108 #ifndef NDEBUG
109   if (!Rec->isSubClassOf("ValueType"))
110     Rec->dump();
111 #endif
112   assert(Rec->isSubClassOf("ValueType") &&
113          "Record must be derived from ValueType");
114   if (Rec->isSubClassOf("HwModeSelect"))
115     return ValueTypeByHwMode(Rec, CGH);
116   return ValueTypeByHwMode(llvm::getValueType(Rec));
117 }
118 
119 RegSizeInfo::RegSizeInfo(Record *R, const CodeGenHwModes &CGH) {
120   RegSize = R->getValueAsInt("RegSize");
121   SpillSize = R->getValueAsInt("SpillSize");
122   SpillAlignment = R->getValueAsInt("SpillAlignment");
123 }
124 
125 bool RegSizeInfo::operator< (const RegSizeInfo &I) const {
126   return std::tie(RegSize, SpillSize, SpillAlignment) <
127          std::tie(I.RegSize, I.SpillSize, I.SpillAlignment);
128 }
129 
130 bool RegSizeInfo::isSubClassOf(const RegSizeInfo &I) const {
131   return RegSize <= I.RegSize &&
132          SpillAlignment && I.SpillAlignment % SpillAlignment == 0 &&
133          SpillSize <= I.SpillSize;
134 }
135 
136 void RegSizeInfo::writeToStream(raw_ostream &OS) const {
137   OS << "[R=" << RegSize << ",S=" << SpillSize
138      << ",A=" << SpillAlignment << ']';
139 }
140 
141 RegSizeInfoByHwMode::RegSizeInfoByHwMode(Record *R,
142       const CodeGenHwModes &CGH) {
143   const HwModeSelect &MS = CGH.getHwModeSelect(R);
144   for (const HwModeSelect::PairType &P : MS.Items) {
145     auto I = Map.insert({P.first, RegSizeInfo(P.second, CGH)});
146     assert(I.second && "Duplicate entry?");
147     (void)I;
148   }
149 }
150 
151 bool RegSizeInfoByHwMode::operator< (const RegSizeInfoByHwMode &I) const {
152   unsigned M0 = Map.begin()->first;
153   return get(M0) < I.get(M0);
154 }
155 
156 bool RegSizeInfoByHwMode::operator== (const RegSizeInfoByHwMode &I) const {
157   unsigned M0 = Map.begin()->first;
158   return get(M0) == I.get(M0);
159 }
160 
161 bool RegSizeInfoByHwMode::isSubClassOf(const RegSizeInfoByHwMode &I) const {
162   unsigned M0 = Map.begin()->first;
163   return get(M0).isSubClassOf(I.get(M0));
164 }
165 
166 bool RegSizeInfoByHwMode::hasStricterSpillThan(const RegSizeInfoByHwMode &I)
167       const {
168   unsigned M0 = Map.begin()->first;
169   const RegSizeInfo &A0 = get(M0);
170   const RegSizeInfo &B0 = I.get(M0);
171   return std::tie(A0.SpillSize, A0.SpillAlignment) >
172          std::tie(B0.SpillSize, B0.SpillAlignment);
173 }
174 
175 void RegSizeInfoByHwMode::writeToStream(raw_ostream &OS) const {
176   typedef typename decltype(Map)::value_type PairType;
177   std::vector<const PairType*> Pairs;
178   for (const auto &P : Map)
179     Pairs.push_back(&P);
180   std::sort(Pairs.begin(), Pairs.end(), deref<std::less<PairType>>());
181 
182   OS << '{';
183   for (unsigned i = 0, e = Pairs.size(); i != e; ++i) {
184     const PairType *P = Pairs[i];
185     OS << '(' << getModeName(P->first) << ':' << P->second << ')';
186     if (i != e-1)
187       OS << ',';
188   }
189   OS << '}';
190 }
191 
192 namespace llvm {
193   raw_ostream &operator<<(raw_ostream &OS, const ValueTypeByHwMode &T) {
194     T.writeToStream(OS);
195     return OS;
196   }
197 
198   raw_ostream &operator<<(raw_ostream &OS, const RegSizeInfo &T) {
199     T.writeToStream(OS);
200     return OS;
201   }
202 
203   raw_ostream &operator<<(raw_ostream &OS, const RegSizeInfoByHwMode &T) {
204     T.writeToStream(OS);
205     return OS;
206   }
207 }
208