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aa6ec15caf
SGPRs are spilled into VGPRs using the {READ,WRITE}LANE_B32 instructions.
v2:
- Fix encoding of Lane Mask
- Use correct register flags, so we don't overwrite the low dword
when restoring multi-dword registers.
v3:
- Register spilling seems to hang the GPU, so replace all shaders
that need spilling with a dummy shader.
v4:
- Fix *LANE definitions
- Change destination reg class for 32-bit SMRD instructions
v5:
- Remove small optimization that was crashing Serious Sam 3.
https://bugs.freedesktop.org/show_bug.cgi?id=68224
https://bugs.freedesktop.org/show_bug.cgi?id=71285
NOTE: This is a candidate for the 3.4 branch.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@195880 91177308-0d34-0410-b5e6-96231b3b80d8
56 lines
1.6 KiB
C++
56 lines
1.6 KiB
C++
//===-- SIMachineFunctionInfo.cpp - SI Machine Function Info -------===//
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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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/// \file
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//===----------------------------------------------------------------------===//
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#include "SIMachineFunctionInfo.h"
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#include "SIRegisterInfo.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#define MAX_LANES 64
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using namespace llvm;
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// Pin the vtable to this file.
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void SIMachineFunctionInfo::anchor() {}
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SIMachineFunctionInfo::SIMachineFunctionInfo(const MachineFunction &MF)
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: AMDGPUMachineFunction(MF),
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PSInputAddr(0),
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SpillTracker() { }
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static unsigned createLaneVGPR(MachineRegisterInfo &MRI) {
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return MRI.createVirtualRegister(&AMDGPU::VReg_32RegClass);
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}
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unsigned SIMachineFunctionInfo::RegSpillTracker::getNextLane(MachineRegisterInfo &MRI) {
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if (!LaneVGPR) {
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LaneVGPR = createLaneVGPR(MRI);
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} else {
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CurrentLane++;
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if (CurrentLane == MAX_LANES) {
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CurrentLane = 0;
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LaneVGPR = createLaneVGPR(MRI);
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}
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}
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return CurrentLane;
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}
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void SIMachineFunctionInfo::RegSpillTracker::addSpilledReg(unsigned FrameIndex,
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unsigned Reg,
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int Lane) {
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SpilledRegisters[FrameIndex] = SpilledReg(Reg, Lane);
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}
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const SIMachineFunctionInfo::SpilledReg&
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SIMachineFunctionInfo::RegSpillTracker::getSpilledReg(unsigned FrameIndex) {
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return SpilledRegisters[FrameIndex];
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}
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