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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@351636 91177308-0d34-0410-b5e6-96231b3b80d8
66 lines
1.9 KiB
C++
66 lines
1.9 KiB
C++
//===----------------------- AMDGPUFrameLowering.cpp ----------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//==-----------------------------------------------------------------------===//
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//
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// Interface to describe a layout of a stack frame on a AMDGPU target machine.
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//
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//===----------------------------------------------------------------------===//
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#include "AMDGPUFrameLowering.h"
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using namespace llvm;
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AMDGPUFrameLowering::AMDGPUFrameLowering(StackDirection D, unsigned StackAl,
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int LAO, unsigned TransAl)
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: TargetFrameLowering(D, StackAl, LAO, TransAl) { }
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AMDGPUFrameLowering::~AMDGPUFrameLowering() = default;
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unsigned AMDGPUFrameLowering::getStackWidth(const MachineFunction &MF) const {
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// XXX: Hardcoding to 1 for now.
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//
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// I think the StackWidth should stored as metadata associated with the
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// MachineFunction. This metadata can either be added by a frontend, or
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// calculated by a R600 specific LLVM IR pass.
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//
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// The StackWidth determines how stack objects are laid out in memory.
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// For a vector stack variable, like: int4 stack[2], the data will be stored
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// in the following ways depending on the StackWidth.
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//
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// StackWidth = 1:
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//
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// T0.X = stack[0].x
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// T1.X = stack[0].y
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// T2.X = stack[0].z
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// T3.X = stack[0].w
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// T4.X = stack[1].x
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// T5.X = stack[1].y
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// T6.X = stack[1].z
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// T7.X = stack[1].w
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//
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// StackWidth = 2:
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//
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// T0.X = stack[0].x
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// T0.Y = stack[0].y
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// T1.X = stack[0].z
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// T1.Y = stack[0].w
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// T2.X = stack[1].x
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// T2.Y = stack[1].y
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// T3.X = stack[1].z
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// T3.Y = stack[1].w
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//
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// StackWidth = 4:
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// T0.X = stack[0].x
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// T0.Y = stack[0].y
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// T0.Z = stack[0].z
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// T0.W = stack[0].w
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// T1.X = stack[1].x
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// T1.Y = stack[1].y
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// T1.Z = stack[1].z
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// T1.W = stack[1].w
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return 1;
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}
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