131 lines
4.6 KiB
C++
131 lines
4.6 KiB
C++
//===-- SystemZCallingConv.h - Calling conventions for SystemZ --*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZCALLINGCONV_H
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#define LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZCALLINGCONV_H
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/CodeGen/CallingConvLower.h"
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#include "llvm/MC/MCRegisterInfo.h"
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namespace llvm {
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namespace SystemZ {
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const unsigned NumArgGPRs = 5;
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extern const MCPhysReg ArgGPRs[NumArgGPRs];
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const unsigned NumArgFPRs = 4;
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extern const MCPhysReg ArgFPRs[NumArgFPRs];
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} // end namespace SystemZ
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class SystemZCCState : public CCState {
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private:
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/// Records whether the value was a fixed argument.
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/// See ISD::OutputArg::IsFixed.
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SmallVector<bool, 4> ArgIsFixed;
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/// Records whether the value was widened from a short vector type.
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SmallVector<bool, 4> ArgIsShortVector;
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// Check whether ArgVT is a short vector type.
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bool IsShortVectorType(EVT ArgVT) {
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return ArgVT.isVector() && ArgVT.getStoreSize() <= 8;
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}
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public:
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SystemZCCState(CallingConv::ID CC, bool isVarArg, MachineFunction &MF,
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SmallVectorImpl<CCValAssign> &locs, LLVMContext &C)
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: CCState(CC, isVarArg, MF, locs, C) {}
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void AnalyzeFormalArguments(const SmallVectorImpl<ISD::InputArg> &Ins,
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CCAssignFn Fn) {
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// Formal arguments are always fixed.
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ArgIsFixed.clear();
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for (unsigned i = 0; i < Ins.size(); ++i)
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ArgIsFixed.push_back(true);
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// Record whether the call operand was a short vector.
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ArgIsShortVector.clear();
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for (unsigned i = 0; i < Ins.size(); ++i)
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ArgIsShortVector.push_back(IsShortVectorType(Ins[i].ArgVT));
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CCState::AnalyzeFormalArguments(Ins, Fn);
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}
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void AnalyzeCallOperands(const SmallVectorImpl<ISD::OutputArg> &Outs,
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CCAssignFn Fn) {
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// Record whether the call operand was a fixed argument.
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ArgIsFixed.clear();
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for (unsigned i = 0; i < Outs.size(); ++i)
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ArgIsFixed.push_back(Outs[i].IsFixed);
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// Record whether the call operand was a short vector.
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ArgIsShortVector.clear();
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for (unsigned i = 0; i < Outs.size(); ++i)
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ArgIsShortVector.push_back(IsShortVectorType(Outs[i].ArgVT));
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CCState::AnalyzeCallOperands(Outs, Fn);
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}
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// This version of AnalyzeCallOperands in the base class is not usable
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// since we must provide a means of accessing ISD::OutputArg::IsFixed.
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void AnalyzeCallOperands(const SmallVectorImpl<MVT> &Outs,
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SmallVectorImpl<ISD::ArgFlagsTy> &Flags,
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CCAssignFn Fn) = delete;
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bool IsFixed(unsigned ValNo) { return ArgIsFixed[ValNo]; }
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bool IsShortVector(unsigned ValNo) { return ArgIsShortVector[ValNo]; }
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};
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// Handle i128 argument types. These need to be passed by implicit
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// reference. This could be as simple as the following .td line:
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// CCIfType<[i128], CCPassIndirect<i64>>,
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// except that i128 is not a legal type, and therefore gets split by
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// common code into a pair of i64 arguments.
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inline bool CC_SystemZ_I128Indirect(unsigned &ValNo, MVT &ValVT,
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MVT &LocVT,
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CCValAssign::LocInfo &LocInfo,
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ISD::ArgFlagsTy &ArgFlags,
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CCState &State) {
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SmallVectorImpl<CCValAssign> &PendingMembers = State.getPendingLocs();
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// ArgFlags.isSplit() is true on the first part of a i128 argument;
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// PendingMembers.empty() is false on all subsequent parts.
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if (!ArgFlags.isSplit() && PendingMembers.empty())
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return false;
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// Push a pending Indirect value location for each part.
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LocVT = MVT::i64;
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LocInfo = CCValAssign::Indirect;
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PendingMembers.push_back(CCValAssign::getPending(ValNo, ValVT,
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LocVT, LocInfo));
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if (!ArgFlags.isSplitEnd())
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return true;
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// OK, we've collected all parts in the pending list. Allocate
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// the location (register or stack slot) for the indirect pointer.
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// (This duplicates the usual i64 calling convention rules.)
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unsigned Reg = State.AllocateReg(SystemZ::ArgGPRs);
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unsigned Offset = Reg ? 0 : State.AllocateStack(8, 8);
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// Use that same location for all the pending parts.
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for (auto &It : PendingMembers) {
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if (Reg)
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It.convertToReg(Reg);
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else
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It.convertToMem(Offset);
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State.addLoc(It);
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}
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PendingMembers.clear();
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return true;
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}
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} // end namespace llvm
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#endif
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