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//===---- MipsCCState.cpp - CCState with Mips specific extensions ---------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "MipsCCState.h"
#include "MipsSubtarget.h"
#include "llvm/IR/Module.h"
using namespace llvm;
/// This function returns true if CallSym is a long double emulation routine.
static bool isF128SoftLibCall(const char *CallSym) {
const char *const LibCalls[] = {
"__addtf3", "__divtf3", "__eqtf2", "__extenddftf2",
"__extendsftf2", "__fixtfdi", "__fixtfsi", "__fixtfti",
"__fixunstfdi", "__fixunstfsi", "__fixunstfti", "__floatditf",
"__floatsitf", "__floattitf", "__floatunditf", "__floatunsitf",
"__floatuntitf", "__getf2", "__gttf2", "__letf2",
"__lttf2", "__multf3", "__netf2", "__powitf2",
"__subtf3", "__trunctfdf2", "__trunctfsf2", "__unordtf2",
"ceill", "copysignl", "cosl", "exp2l",
"expl", "floorl", "fmal", "fmodl",
"log10l", "log2l", "logl", "nearbyintl",
"powl", "rintl", "sinl", "sqrtl",
"truncl"};
const char *const *End = LibCalls + array_lengthof(LibCalls);
// Check that LibCalls is sorted alphabetically.
MipsTargetLowering::LTStr Comp;
#ifndef NDEBUG
for (const char *const *I = LibCalls; I < End - 1; ++I)
assert(Comp(*I, *(I + 1)));
#endif
return std::binary_search(LibCalls, End, CallSym, Comp);
}
/// This function returns true if Ty is fp128, {f128} or i128 which was
/// originally a fp128.
static bool originalTypeIsF128(const Type *Ty, const SDNode *CallNode) {
if (Ty->isFP128Ty())
return true;
if (Ty->isStructTy() && Ty->getStructNumElements() == 1 &&
Ty->getStructElementType(0)->isFP128Ty())
return true;
const ExternalSymbolSDNode *ES =
dyn_cast_or_null<const ExternalSymbolSDNode>(CallNode);
// If the Ty is i128 and the function being called is a long double emulation
// routine, then the original type is f128.
return (ES && Ty->isIntegerTy(128) && isF128SoftLibCall(ES->getSymbol()));
}
MipsCCState::SpecialCallingConvType
MipsCCState::getSpecialCallingConvForCallee(const SDNode *Callee,
const MipsSubtarget &Subtarget) {
MipsCCState::SpecialCallingConvType SpecialCallingConv = NoSpecialCallingConv;
if (Subtarget.inMips16HardFloat()) {
if (const GlobalAddressSDNode *G =
dyn_cast<const GlobalAddressSDNode>(Callee)) {
llvm::StringRef Sym = G->getGlobal()->getName();
Function *F = G->getGlobal()->getParent()->getFunction(Sym);
if (F && F->hasFnAttribute("__Mips16RetHelper")) {
SpecialCallingConv = Mips16RetHelperConv;
}
}
}
return SpecialCallingConv;
}
void MipsCCState::PreAnalyzeCallResultForF128(
const SmallVectorImpl<ISD::InputArg> &Ins,
const TargetLowering::CallLoweringInfo &CLI) {
for (unsigned i = 0; i < Ins.size(); ++i) {
OriginalArgWasF128.push_back(
originalTypeIsF128(CLI.RetTy, CLI.Callee.getNode()));
OriginalArgWasFloat.push_back(CLI.RetTy->isFloatingPointTy());
}
}
/// Identify lowered values that originated from f128 arguments and record
/// this for use by RetCC_MipsN.
void MipsCCState::PreAnalyzeReturnForF128(
const SmallVectorImpl<ISD::OutputArg> &Outs) {
const MachineFunction &MF = getMachineFunction();
for (unsigned i = 0; i < Outs.size(); ++i) {
OriginalArgWasF128.push_back(
originalTypeIsF128(MF.getFunction()->getReturnType(), nullptr));
OriginalArgWasFloat.push_back(
MF.getFunction()->getReturnType()->isFloatingPointTy());
}
}
/// Identify lowered values that originated from f128 arguments and record
/// this.
void MipsCCState::PreAnalyzeCallOperands(
const SmallVectorImpl<ISD::OutputArg> &Outs,
std::vector<TargetLowering::ArgListEntry> &FuncArgs,
const SDNode *CallNode) {
for (unsigned i = 0; i < Outs.size(); ++i) {
OriginalArgWasF128.push_back(
originalTypeIsF128(FuncArgs[Outs[i].OrigArgIndex].Ty, CallNode));
OriginalArgWasFloat.push_back(
FuncArgs[Outs[i].OrigArgIndex].Ty->isFloatingPointTy());
CallOperandIsFixed.push_back(Outs[i].IsFixed);
}
}
/// Identify lowered values that originated from f128 arguments and record
/// this.
void MipsCCState::PreAnalyzeFormalArgumentsForF128(
const SmallVectorImpl<ISD::InputArg> &Ins) {
const MachineFunction &MF = getMachineFunction();
for (unsigned i = 0; i < Ins.size(); ++i) {
Function::const_arg_iterator FuncArg = MF.getFunction()->arg_begin();
// SRet arguments cannot originate from f128 or {f128} returns so we just
// push false. We have to handle this specially since SRet arguments
// aren't mapped to an original argument.
if (Ins[i].Flags.isSRet()) {
OriginalArgWasF128.push_back(false);
OriginalArgWasFloat.push_back(false);
continue;
}
assert(Ins[i].getOrigArgIndex() < MF.getFunction()->arg_size());
std::advance(FuncArg, Ins[i].getOrigArgIndex());
OriginalArgWasF128.push_back(
originalTypeIsF128(FuncArg->getType(), nullptr));
OriginalArgWasFloat.push_back(FuncArg->getType()->isFloatingPointTy());
}
}
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