1 //===-- SIRegisterInfo.h - SI Register Info Interface ----------*- C++ -*--===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
11 /// \brief Interface definition for SIRegisterInfo
13 //===----------------------------------------------------------------------===//
16 #ifndef LLVM_LIB_TARGET_R600_SIREGISTERINFO_H
17 #define LLVM_LIB_TARGET_R600_SIREGISTERINFO_H
19 #include "AMDGPURegisterInfo.h"
20 #include "AMDGPUSubtarget.h"
21 #include "llvm/Support/Debug.h"
25 struct SIRegisterInfo : public AMDGPURegisterInfo {
27 void reserveRegisterTuples(BitVector &, unsigned Reg) const;
32 BitVector getReservedRegs(const MachineFunction &MF) const override;
34 unsigned getRegPressureSetLimit(const MachineFunction &MF,
35 unsigned Idx) const override;
37 bool requiresRegisterScavenging(const MachineFunction &Fn) const override;
39 void eliminateFrameIndex(MachineBasicBlock::iterator MI, int SPAdj,
40 unsigned FIOperandNum,
41 RegScavenger *RS) const override;
43 unsigned getHWRegIndex(unsigned Reg) const override;
45 /// \brief Return the 'base' register class for this register.
46 /// e.g. SGPR0 => SReg_32, VGPR => VGPR_32 SGPR0_SGPR1 -> SReg_32, etc.
47 const TargetRegisterClass *getPhysRegClass(unsigned Reg) const;
49 /// \returns true if this class contains only SGPR registers
50 bool isSGPRClass(const TargetRegisterClass *RC) const {
54 /// \returns true if this class ID contains only SGPR registers
55 bool isSGPRClassID(unsigned RCID) const {
56 return isSGPRClass(getRegClass(RCID));
59 /// \returns true if this class contains VGPR registers.
60 bool hasVGPRs(const TargetRegisterClass *RC) const;
62 /// returns true if this is a pseudoregister class combination of VGPRs and
63 /// SGPRs for operand modeling. FIXME: We should set isAllocatable = 0 on
65 static bool isPseudoRegClass(const TargetRegisterClass *RC) {
66 return RC == &AMDGPU::VS_32RegClass || RC == &AMDGPU::VS_64RegClass;
69 /// \returns A VGPR reg class with the same width as \p SRC
70 const TargetRegisterClass *getEquivalentVGPRClass(
71 const TargetRegisterClass *SRC) const;
73 /// \returns The register class that is used for a sub-register of \p RC for
74 /// the given \p SubIdx. If \p SubIdx equals NoSubRegister, \p RC will
76 const TargetRegisterClass *getSubRegClass(const TargetRegisterClass *RC,
77 unsigned SubIdx) const;
79 bool shouldRewriteCopySrc(const TargetRegisterClass *DefRC,
81 const TargetRegisterClass *SrcRC,
82 unsigned SrcSubReg) const override;
84 /// \p Channel This is the register channel (e.g. a value from 0-16), not the
86 /// \returns The sub-register of Reg that is in Channel.
87 unsigned getPhysRegSubReg(unsigned Reg, const TargetRegisterClass *SubRC,
88 unsigned Channel) const;
90 /// \returns True if operands defined with this operand type can accept
91 /// a literal constant (i.e. any 32-bit immediate).
92 bool opCanUseLiteralConstant(unsigned OpType) const;
94 /// \returns True if operands defined with this operand type can accept
95 /// an inline constant. i.e. An integer value in the range (-16, 64) or
96 /// -4.0f, -2.0f, -1.0f, -0.5f, 0.0f, 0.5f, 1.0f, 2.0f, 4.0f.
97 bool opCanUseInlineConstant(unsigned OpType) const;
101 PRIVATE_SEGMENT_BUFFER = 0,
104 KERNARG_SEGMENT_PTR = 3,
108 PRIVATE_SEGMENT_WAVE_BYTE_OFFSET = 14,
111 FIRST_VGPR_VALUE = 15,
112 WORKITEM_ID_X = FIRST_VGPR_VALUE,
117 /// \brief Returns the physical register that \p Value is stored in.
118 unsigned getPreloadedValue(const MachineFunction &MF,
119 enum PreloadedValue Value) const;
121 /// \brief Give the maximum number of VGPRs that can be used by \p WaveCount
122 /// concurrent waves.
123 unsigned getNumVGPRsAllowed(unsigned WaveCount) const;
125 /// \brief Give the maximum number of SGPRs that can be used by \p WaveCount
126 /// concurrent waves.
127 unsigned getNumSGPRsAllowed(AMDGPUSubtarget::Generation gen,
128 unsigned WaveCount) const;
130 unsigned findUnusedRegister(const MachineRegisterInfo &MRI,
131 const TargetRegisterClass *RC) const;
134 void buildScratchLoadStore(MachineBasicBlock::iterator MI,
135 unsigned LoadStoreOp, unsigned Value,
136 unsigned ScratchRsrcReg, unsigned ScratchOffset,
137 int64_t Offset, RegScavenger *RS) const;
140 } // End namespace llvm