Coverage Report

Created: 2019-07-24 05:18

/Users/buildslave/jenkins/workspace/clang-stage2-coverage-R/llvm/lib/Target/AMDGPU/AMDGPUFrameLowering.cpp
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//===----------------------- 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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}