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", "sinl", "sqrtl",
30 "truncl"};
31
32 const char *const *End = LibCalls + array_lengthof(LibCalls);
33
34 // Check that LibCalls is sorted alphabetically.
35 MipsTargetLowering::LTStr Comp;
36
37 #ifndef NDEBUG
38 for (const char *const *I = LibCalls; I < End - 1; ++I)
39 assert(Comp(*I, *(I + 1)));
40 #endif
41
42 return std::binary_search(LibCalls, End, CallSym, Comp);
43 }
44
45 /// This function returns true if Ty is fp128, {f128} or i128 which was
46 /// originally a fp128.
originalTypeIsF128(const Type * Ty,const SDNode * CallNode)47 static bool originalTypeIsF128(const Type *Ty, const SDNode *CallNode) {
48 if (Ty->isFP128Ty())
49 return true;
50
51 if (Ty->isStructTy() && Ty->getStructNumElements() == 1 &&
52 Ty->getStructElementType(0)->isFP128Ty())
53 return true;
54
55 const ExternalSymbolSDNode *ES =
56 dyn_cast_or_null<const ExternalSymbolSDNode>(CallNode);
57
58 // If the Ty is i128 and the function being called is a long double emulation
59 // routine, then the original type is f128.
60 return (ES && Ty->isIntegerTy(128) && isF128SoftLibCall(ES->getSymbol()));
61 }
62
63 MipsCCState::SpecialCallingConvType
getSpecialCallingConvForCallee(const SDNode * Callee,const MipsSubtarget & Subtarget)64 MipsCCState::getSpecialCallingConvForCallee(const SDNode *Callee,
65 const MipsSubtarget &Subtarget) {
66 MipsCCState::SpecialCallingConvType SpecialCallingConv = NoSpecialCallingConv;
67 if (Subtarget.inMips16HardFloat()) {
68 if (const GlobalAddressSDNode *G =
69 dyn_cast<const GlobalAddressSDNode>(Callee)) {
70 llvm::StringRef Sym = G->getGlobal()->getName();
71 Function *F = G->getGlobal()->getParent()->getFunction(Sym);
72 if (F && F->hasFnAttribute("__Mips16RetHelper")) {
73 SpecialCallingConv = Mips16RetHelperConv;
74 }
75 }
76 }
77 return SpecialCallingConv;
78 }
79
PreAnalyzeCallResultForF128(const SmallVectorImpl<ISD::InputArg> & Ins,const TargetLowering::CallLoweringInfo & CLI)80 void MipsCCState::PreAnalyzeCallResultForF128(
81 const SmallVectorImpl<ISD::InputArg> &Ins,
82 const TargetLowering::CallLoweringInfo &CLI) {
83 for (unsigned i = 0; i < Ins.size(); ++i) {
84 OriginalArgWasF128.push_back(
85 originalTypeIsF128(CLI.RetTy, CLI.Callee.getNode()));
86 OriginalArgWasFloat.push_back(CLI.RetTy->isFloatingPointTy());
87 }
88 }
89
90 /// Identify lowered values that originated from f128 arguments and record
91 /// this for use by RetCC_MipsN.
PreAnalyzeReturnForF128(const SmallVectorImpl<ISD::OutputArg> & Outs)92 void MipsCCState::PreAnalyzeReturnForF128(
93 const SmallVectorImpl<ISD::OutputArg> &Outs) {
94 const MachineFunction &MF = getMachineFunction();
95 for (unsigned i = 0; i < Outs.size(); ++i) {
96 OriginalArgWasF128.push_back(
97 originalTypeIsF128(MF.getFunction()->getReturnType(), nullptr));
98 OriginalArgWasFloat.push_back(
99 MF.getFunction()->getReturnType()->isFloatingPointTy());
100 }
101 }
102
103 /// Identify lowered values that originated from f128 arguments and record
104 /// this.
PreAnalyzeCallOperands(const SmallVectorImpl<ISD::OutputArg> & Outs,std::vector<TargetLowering::ArgListEntry> & FuncArgs,const SDNode * CallNode)105 void MipsCCState::PreAnalyzeCallOperands(
106 const SmallVectorImpl<ISD::OutputArg> &Outs,
107 std::vector<TargetLowering::ArgListEntry> &FuncArgs,
108 const SDNode *CallNode) {
109 for (unsigned i = 0; i < Outs.size(); ++i) {
110 OriginalArgWasF128.push_back(
111 originalTypeIsF128(FuncArgs[Outs[i].OrigArgIndex].Ty, CallNode));
112 OriginalArgWasFloat.push_back(
113 FuncArgs[Outs[i].OrigArgIndex].Ty->isFloatingPointTy());
114 CallOperandIsFixed.push_back(Outs[i].IsFixed);
115 }
116 }
117
118 /// Identify lowered values that originated from f128 arguments and record
119 /// this.
PreAnalyzeFormalArgumentsForF128(const SmallVectorImpl<ISD::InputArg> & Ins)120 void MipsCCState::PreAnalyzeFormalArgumentsForF128(
121 const SmallVectorImpl<ISD::InputArg> &Ins) {
122 const MachineFunction &MF = getMachineFunction();
123 for (unsigned i = 0; i < Ins.size(); ++i) {
124 Function::const_arg_iterator FuncArg = MF.getFunction()->arg_begin();
125
126 // SRet arguments cannot originate from f128 or {f128} returns so we just
127 // push false. We have to handle this specially since SRet arguments
128 // aren't mapped to an original argument.
129 if (Ins[i].Flags.isSRet()) {
130 OriginalArgWasF128.push_back(false);
131 OriginalArgWasFloat.push_back(false);
132 continue;
133 }
134
135 assert(Ins[i].getOrigArgIndex() < MF.getFunction()->arg_size());
136 std::advance(FuncArg, Ins[i].getOrigArgIndex());
137
138 OriginalArgWasF128.push_back(
139 originalTypeIsF128(FuncArg->getType(), nullptr));
140 OriginalArgWasFloat.push_back(FuncArg->getType()->isFloatingPointTy());
141 }
142 }
143