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1 //=====-- SPUFrameLowering.h - SPU Frame Lowering stuff -*- 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 // This file contains CellSPU frame information that doesn't fit anywhere else
11 // cleanly...
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #ifndef SPU_FRAMEINFO_H
16 #define SPU_FRAMEINFO_H
17 
18 #include "SPURegisterInfo.h"
19 #include "llvm/Target/TargetFrameLowering.h"
20 #include "llvm/Target/TargetMachine.h"
21 
22 namespace llvm {
23   class SPUSubtarget;
24 
25   class SPUFrameLowering: public TargetFrameLowering {
26     const SPUSubtarget &Subtarget;
27     std::pair<unsigned, int> LR[1];
28 
29   public:
30     SPUFrameLowering(const SPUSubtarget &sti);
31 
32     //! Determine the frame's layour
33     void determineFrameLayout(MachineFunction &MF) const;
34 
35     /// emitProlog/emitEpilog - These methods insert prolog and epilog code into
36     /// the function.
37     void emitPrologue(MachineFunction &MF) const;
38     void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
39 
40     //! Prediate: Target has dedicated frame pointer
41     bool hasFP(const MachineFunction &MF) const;
42 
43     void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
44                                               RegScavenger *RS = NULL) const;
45 
46     //! Return a function's saved spill slots
47     /*!
48       For CellSPU, a function's saved spill slots is just the link register.
49      */
50     const std::pair<unsigned, int> *
51     getCalleeSaveSpillSlots(unsigned &NumEntries) const;
52 
53     //! Stack slot size (16 bytes)
stackSlotSize()54     static int stackSlotSize() {
55       return 16;
56     }
57     //! Maximum frame offset representable by a signed 10-bit integer
58     /*!
59       This is the maximum frame offset that can be expressed as a 10-bit
60       integer, used in D-form addresses.
61      */
maxFrameOffset()62     static int maxFrameOffset() {
63       return ((1 << 9) - 1) * stackSlotSize();
64     }
65     //! Minimum frame offset representable by a signed 10-bit integer
minFrameOffset()66     static int minFrameOffset() {
67       return -(1 << 9) * stackSlotSize();
68     }
69     //! Minimum frame size (enough to spill LR + SP)
minStackSize()70     static int minStackSize() {
71       return (2 * stackSlotSize());
72     }
73     //! Convert frame index to stack offset
FItoStackOffset(int frame_index)74     static int FItoStackOffset(int frame_index) {
75       return frame_index * stackSlotSize();
76     }
77   };
78 }
79 
80 #endif
81