SystemZCallingConv.h revision 288943 
1//===-- SystemZCallingConv.h - Calling conventions for SystemZ --*- C++ -*-===//
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#ifndef LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZCALLINGCONV_H
11#define LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZCALLINGCONV_H
12
13#include "llvm/ADT/SmallVector.h"
14#include "llvm/CodeGen/CallingConvLower.h"
15
16namespace llvm {
17namespace SystemZ {
18  const unsigned NumArgGPRs = 5;
19  extern const unsigned ArgGPRs[NumArgGPRs];
20
21  const unsigned NumArgFPRs = 4;
22  extern const unsigned ArgFPRs[NumArgFPRs];
23} // end namespace SystemZ
24
25class SystemZCCState : public CCState {
26private:
27  /// Records whether the value was a fixed argument.
28  /// See ISD::OutputArg::IsFixed.
29  SmallVector<bool, 4> ArgIsFixed;
30
31  /// Records whether the value was widened from a short vector type.
32  SmallVector<bool, 4> ArgIsShortVector;
33
34  // Check whether ArgVT is a short vector type.
35  bool IsShortVectorType(EVT ArgVT) {
36    return ArgVT.isVector() && ArgVT.getStoreSize() <= 8;
37  }
38
39public:
40  SystemZCCState(CallingConv::ID CC, bool isVarArg, MachineFunction &MF,
41                 SmallVectorImpl<CCValAssign> &locs, LLVMContext &C)
42      : CCState(CC, isVarArg, MF, locs, C) {}
43
44  void AnalyzeFormalArguments(const SmallVectorImpl<ISD::InputArg> &Ins,
45                              CCAssignFn Fn) {
46    // Formal arguments are always fixed.
47    ArgIsFixed.clear();
48    for (unsigned i = 0; i < Ins.size(); ++i)
49      ArgIsFixed.push_back(true);
50    // Record whether the call operand was a short vector.
51    ArgIsShortVector.clear();
52    for (unsigned i = 0; i < Ins.size(); ++i)
53      ArgIsShortVector.push_back(IsShortVectorType(Ins[i].ArgVT));
54
55    CCState::AnalyzeFormalArguments(Ins, Fn);
56  }
57
58  void AnalyzeCallOperands(const SmallVectorImpl<ISD::OutputArg> &Outs,
59                           CCAssignFn Fn) {
60    // Record whether the call operand was a fixed argument.
61    ArgIsFixed.clear();
62    for (unsigned i = 0; i < Outs.size(); ++i)
63      ArgIsFixed.push_back(Outs[i].IsFixed);
64    // Record whether the call operand was a short vector.
65    ArgIsShortVector.clear();
66    for (unsigned i = 0; i < Outs.size(); ++i)
67      ArgIsShortVector.push_back(IsShortVectorType(Outs[i].ArgVT));
68
69    CCState::AnalyzeCallOperands(Outs, Fn);
70  }
71
72  // This version of AnalyzeCallOperands in the base class is not usable
73  // since we must provide a means of accessing ISD::OutputArg::IsFixed.
74  void AnalyzeCallOperands(const SmallVectorImpl<MVT> &Outs,
75                           SmallVectorImpl<ISD::ArgFlagsTy> &Flags,
76                           CCAssignFn Fn) = delete;
77
78  bool IsFixed(unsigned ValNo) { return ArgIsFixed[ValNo]; }
79  bool IsShortVector(unsigned ValNo) { return ArgIsShortVector[ValNo]; }
80};
81
82} // end namespace llvm
83
84#endif
85