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//===---- MipsCCState.cpp - CCState with Mips specific extensions ---------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#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", "fmaxl",
"fmodl", "log10l", "log2l", "logl",
"nearbyintl", "powl", "rintl", "roundl",
"sinl", "sqrtl", "truncl"};
// Check that LibCalls is sorted alphabetically.
auto Comp = [](const char *S1, const char *S2) { return strcmp(S1, S2) < 0; };
assert(std::is_sorted(std::begin(LibCalls), std::end(LibCalls), Comp));
return std::binary_search(std::begin(LibCalls), std::end(LibCalls),
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 char *Func) {
if (Ty->isFP128Ty())
return true;
if (Ty->isStructTy() && Ty->getStructNumElements() == 1 &&
Ty->getStructElementType(0)->isFP128Ty())
return true;
// If the Ty is i128 and the function being called is a long double emulation
// routine, then the original type is f128.
return (Func && Ty->isIntegerTy(128) && isF128SoftLibCall(Func));
}
/// Return true if the original type was vXfXX.
static bool originalEVTTypeIsVectorFloat(EVT Ty) {
if (Ty.isVector() && Ty.getVectorElementType().isFloatingPoint())
return true;
return false;
}
/// Return true if the original type was vXfXX / vXfXX.
static bool originalTypeIsVectorFloat(const Type * Ty) {
if (Ty->isVectorTy() && Ty->isFPOrFPVectorTy())
return true;
return false;
}
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 Type *RetTy, const char *Call) {
for (unsigned i = 0; i < Ins.size(); ++i) {
OriginalArgWasF128.push_back(
originalTypeIsF128(RetTy, Call));
OriginalArgWasFloat.push_back(RetTy->isFloatingPointTy());
}
}
/// Identify lowered values that originated from f128 or float 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 lower values that originated from vXfXX and record
/// this.
void MipsCCState::PreAnalyzeCallResultForVectorFloat(
const SmallVectorImpl<ISD::InputArg> &Ins, const Type *RetTy) {
for (unsigned i = 0; i < Ins.size(); ++i) {
OriginalRetWasFloatVector.push_back(originalTypeIsVectorFloat(RetTy));
}
}
/// Identify lowered values that originated from vXfXX arguments and record
/// this.
void MipsCCState::PreAnalyzeReturnForVectorFloat(
const SmallVectorImpl<ISD::OutputArg> &Outs) {
for (unsigned i = 0; i < Outs.size(); ++i) {
ISD::OutputArg Out = Outs[i];
OriginalRetWasFloatVector.push_back(
originalEVTTypeIsVectorFloat(Out.ArgVT));
}
}
/// Identify lowered values that originated from f128, float and sret to vXfXX
/// arguments and record this.
void MipsCCState::PreAnalyzeCallOperands(
const SmallVectorImpl<ISD::OutputArg> &Outs,
std::vector<TargetLowering::ArgListEntry> &FuncArgs,
const char *Func) {
for (unsigned i = 0; i < Outs.size(); ++i) {
TargetLowering::ArgListEntry FuncArg = FuncArgs[Outs[i].OrigArgIndex];
OriginalArgWasF128.push_back(originalTypeIsF128(FuncArg.Ty, Func));
OriginalArgWasFloat.push_back(FuncArg.Ty->isFloatingPointTy());
OriginalArgWasFloatVector.push_back(FuncArg.Ty->isVectorTy());
CallOperandIsFixed.push_back(Outs[i].IsFixed);
}
}
/// Identify lowered values that originated from f128, float and vXfXX 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);
OriginalArgWasFloatVector.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());
// The MIPS vector ABI exhibits a corner case of sorts or quirk; if the
// first argument is actually an SRet pointer to a vector, then the next
// argument slot is $a2.
OriginalArgWasFloatVector.push_back(FuncArg->getType()->isVectorTy());
}
}
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