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1 //===---- MipsCCState.cpp - CCState with Mips specific extensions ---------===//
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 
10 #include "MipsCCState.h"
11 #include "MipsSubtarget.h"
12 #include "llvm/IR/Module.h"
13 
14 using namespace llvm;
15 
16 /// This function returns true if CallSym is a long double emulation routine.
isF128SoftLibCall(const char * CallSym)17 static bool isF128SoftLibCall(const char *CallSym) {
18   const char *const LibCalls[] = {
19       "__addtf3",      "__divtf3",     "__eqtf2",       "__extenddftf2",
20       "__extendsftf2", "__fixtfdi",    "__fixtfsi",     "__fixtfti",
21       "__fixunstfdi",  "__fixunstfsi", "__fixunstfti",  "__floatditf",
22       "__floatsitf",   "__floattitf",  "__floatunditf", "__floatunsitf",
23       "__floatuntitf", "__getf2",      "__gttf2",       "__letf2",
24       "__lttf2",       "__multf3",     "__netf2",       "__powitf2",
25       "__subtf3",      "__trunctfdf2", "__trunctfsf2",  "__unordtf2",
26       "ceill",         "copysignl",    "cosl",          "exp2l",
27       "expl",          "floorl",       "fmal",          "fmodl",
28       "log10l",        "log2l",        "logl",          "nearbyintl",
29       "powl",          "rintl",        "roundl",        "sinl",
30       "sqrtl",         "truncl"};
31 
32   // Check that LibCalls is sorted alphabetically.
33   auto Comp = [](const char *S1, const char *S2) { return strcmp(S1, S2) < 0; };
34   assert(std::is_sorted(std::begin(LibCalls), std::end(LibCalls), Comp));
35   return std::binary_search(std::begin(LibCalls), std::end(LibCalls),
36                             CallSym, Comp);
37 }
38 
39 /// This function returns true if Ty is fp128, {f128} or i128 which was
40 /// originally a fp128.
originalTypeIsF128(Type * Ty,const SDNode * CallNode)41 static bool originalTypeIsF128(Type *Ty, const SDNode *CallNode) {
42   if (Ty->isFP128Ty())
43     return true;
44 
45   if (Ty->isStructTy() && Ty->getStructNumElements() == 1 &&
46       Ty->getStructElementType(0)->isFP128Ty())
47     return true;
48 
49   const ExternalSymbolSDNode *ES =
50       dyn_cast_or_null<const ExternalSymbolSDNode>(CallNode);
51 
52   // If the Ty is i128 and the function being called is a long double emulation
53   // routine, then the original type is f128.
54   return (ES && Ty->isIntegerTy(128) && isF128SoftLibCall(ES->getSymbol()));
55 }
56 
57 MipsCCState::SpecialCallingConvType
getSpecialCallingConvForCallee(const SDNode * Callee,const MipsSubtarget & Subtarget)58 MipsCCState::getSpecialCallingConvForCallee(const SDNode *Callee,
59                                             const MipsSubtarget &Subtarget) {
60   MipsCCState::SpecialCallingConvType SpecialCallingConv = NoSpecialCallingConv;
61   if (Subtarget.inMips16HardFloat()) {
62     if (const GlobalAddressSDNode *G =
63             dyn_cast<const GlobalAddressSDNode>(Callee)) {
64       llvm::StringRef Sym = G->getGlobal()->getName();
65       Function *F = G->getGlobal()->getParent()->getFunction(Sym);
66       if (F && F->hasFnAttribute("__Mips16RetHelper")) {
67         SpecialCallingConv = Mips16RetHelperConv;
68       }
69     }
70   }
71   return SpecialCallingConv;
72 }
73 
PreAnalyzeCallResultForF128(const SmallVectorImpl<ISD::InputArg> & Ins,const TargetLowering::CallLoweringInfo & CLI)74 void MipsCCState::PreAnalyzeCallResultForF128(
75     const SmallVectorImpl<ISD::InputArg> &Ins,
76     const TargetLowering::CallLoweringInfo &CLI) {
77   for (unsigned i = 0; i < Ins.size(); ++i) {
78     OriginalArgWasF128.push_back(
79         originalTypeIsF128(CLI.RetTy, CLI.Callee.getNode()));
80     OriginalArgWasFloat.push_back(CLI.RetTy->isFloatingPointTy());
81   }
82 }
83 
84 /// Identify lowered values that originated from f128 arguments and record
85 /// this for use by RetCC_MipsN.
PreAnalyzeReturnForF128(const SmallVectorImpl<ISD::OutputArg> & Outs)86 void MipsCCState::PreAnalyzeReturnForF128(
87     const SmallVectorImpl<ISD::OutputArg> &Outs) {
88   const MachineFunction &MF = getMachineFunction();
89   for (unsigned i = 0; i < Outs.size(); ++i) {
90     OriginalArgWasF128.push_back(
91         originalTypeIsF128(MF.getFunction()->getReturnType(), nullptr));
92     OriginalArgWasFloat.push_back(
93         MF.getFunction()->getReturnType()->isFloatingPointTy());
94   }
95 }
96 
97 /// Identify lowered values that originated from f128 arguments and record
98 /// this.
PreAnalyzeCallOperands(const SmallVectorImpl<ISD::OutputArg> & Outs,std::vector<TargetLowering::ArgListEntry> & FuncArgs,const SDNode * CallNode)99 void MipsCCState::PreAnalyzeCallOperands(
100     const SmallVectorImpl<ISD::OutputArg> &Outs,
101     std::vector<TargetLowering::ArgListEntry> &FuncArgs,
102     const SDNode *CallNode) {
103   for (unsigned i = 0; i < Outs.size(); ++i) {
104     OriginalArgWasF128.push_back(
105         originalTypeIsF128(FuncArgs[Outs[i].OrigArgIndex].Ty, CallNode));
106     OriginalArgWasFloat.push_back(
107         FuncArgs[Outs[i].OrigArgIndex].Ty->isFloatingPointTy());
108     CallOperandIsFixed.push_back(Outs[i].IsFixed);
109   }
110 }
111 
112 /// Identify lowered values that originated from f128 arguments and record
113 /// this.
PreAnalyzeFormalArgumentsForF128(const SmallVectorImpl<ISD::InputArg> & Ins)114 void MipsCCState::PreAnalyzeFormalArgumentsForF128(
115     const SmallVectorImpl<ISD::InputArg> &Ins) {
116   const MachineFunction &MF = getMachineFunction();
117   for (unsigned i = 0; i < Ins.size(); ++i) {
118     Function::const_arg_iterator FuncArg = MF.getFunction()->arg_begin();
119 
120     // SRet arguments cannot originate from f128 or {f128} returns so we just
121     // push false. We have to handle this specially since SRet arguments
122     // aren't mapped to an original argument.
123     if (Ins[i].Flags.isSRet()) {
124       OriginalArgWasF128.push_back(false);
125       OriginalArgWasFloat.push_back(false);
126       continue;
127     }
128 
129     assert(Ins[i].getOrigArgIndex() < MF.getFunction()->arg_size());
130     std::advance(FuncArg, Ins[i].getOrigArgIndex());
131 
132     OriginalArgWasF128.push_back(
133         originalTypeIsF128(FuncArg->getType(), nullptr));
134     OriginalArgWasFloat.push_back(FuncArg->getType()->isFloatingPointTy());
135   }
136 }
137