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/*========================== begin_copyright_notice ============================
Copyright (C) 2018-2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
#include "FixSampleDInputs.h"
#include "common/LLVMWarningsPush.hpp"
#include <llvm/IR/Instruction.h>
#include <llvm/IR/BasicBlock.h>
#include "common/LLVMWarningsPop.hpp"
#include "GenISAIntrinsics/GenIntrinsics.h"
#include "GenISAIntrinsics/GenIntrinsicInst.h"
#include "Compiler/CodeGenPublic.h"
#include "Compiler/IGCPassSupport.h"
using namespace llvm;
namespace IGC
{
class FixSampleDInputsPass : public FunctionPass
{
public:
FixSampleDInputsPass() :
FunctionPass(ID)
{ }
virtual bool runOnFunction(Function& F) override;
virtual void getAnalysisUsage(AnalysisUsage& AU) const override
{
AU.addRequired<CodeGenContextWrapper>();
AU.setPreservesCFG();
}
virtual StringRef getPassName() const override { return "FixSampleDInputs"; }
static char ID;
};
#define PASS_FLAG "igc-fix-sampled-inputs"
#define PASS_DESCRIPTION "Fix sample_d inputs"
#define PASS_CFG_ONLY false
#define PASS_ANALYSIS false
IGC_INITIALIZE_PASS_BEGIN(FixSampleDInputsPass, PASS_FLAG, PASS_DESCRIPTION, PASS_CFG_ONLY, PASS_ANALYSIS)
IGC_INITIALIZE_PASS_DEPENDENCY(CodeGenContextWrapper)
IGC_INITIALIZE_PASS_END(FixSampleDInputsPass, PASS_FLAG, PASS_DESCRIPTION, PASS_CFG_ONLY, PASS_ANALYSIS)
bool FixSampleDInputsPass::runOnFunction(Function& F)
{
bool changed = false;
Module* M = F.getParent();
Type* volumeTextureType = GetResourceDimensionType(*M, RESOURCE_DIMENSION_TYPE::DIM_3D_TYPE);
Type* cubeTextureType = GetResourceDimensionType(*M, RESOURCE_DIMENSION_TYPE::DIM_CUBE_TYPE);
Type* cubeArrayTextureType = GetResourceDimensionType(*M, RESOURCE_DIMENSION_TYPE::DIM_CUBE_ARRAY_TYPE);
for (BasicBlock& BB : F)
{
for (Instruction& inst : BB)
{
SampleIntrinsic* sampleInst = dyn_cast<SampleIntrinsic>(&inst);
Type* textureType = sampleInst ? IGCLLVM::getNonOpaquePtrEltTy(sampleInst->getTextureValue()->getType()) : nullptr;
// 3D/Cube/CubeArray access is emulated in CodeGen, see EmitPass::emulateSampleD()
if (sampleInst &&
(textureType != volumeTextureType && textureType != cubeTextureType && textureType != cubeArrayTextureType))
{
Value* zero = ConstantFP::get(sampleInst->getArgOperand(0)->getType(), 0.0);
if (sampleInst->getIntrinsicID() == GenISAIntrinsic::GenISA_sampleDptr)
{
// (1) Message format with 3D/Cube/CubeArray support
// sample_d u dudx dudy v dvdx dvdy r drdx drdy ai mlod
// (2) Message format without 3D/Cube/CubeArray support
// sample_d u dudx dudy u dvdx dvdy r mlod
// Copy MLOD param to the place expected in the 1D/2D/2DArray message format (2)
changed = true;
sampleInst->setArgOperand(7, sampleInst->getArgOperand(10));
sampleInst->setArgOperand(10, zero);
}
else if (sampleInst->getIntrinsicID() == GenISAIntrinsic::GenISA_sampleDCMlodptr)
{
// Combine the array index and mlod for 2DArray textures
// and place it in the mlod_r param for other texture
// types just copy mlod over to the mlod_r.
// Intrinsic parameters support all dimensions, HW
// message supports only 1D, 1DArray, 2D and 2DArray.
// Emulation is done in EmitPass::emulateSampleD().
// Intrinsic params:
// sample_d_c_mlod ref u dudx dudy v dvdx dvdy r drdx drdy ai mlod
// Message format
// sample_d_c_mlod ref u dudx dudy u dvdx dvdy mlod_r
uint mlod_rParamIndex = 7;
uint mlodParamIndex = 11;
Value* mlod_r = sampleInst->getArgOperand(mlodParamIndex); // MLOD
Type* type2DArray = GetResourceDimensionType(*M, RESOURCE_DIMENSION_TYPE::DIM_2D_ARRAY_TYPE);
Type* typeTex = IGCLLVM::getNonOpaquePtrEltTy(sampleInst->getTextureValue()->getType());
if (typeTex == type2DArray)
{
// combine MLOD and R
uint numBits = 12; // number of bits to use to encode AI into MLOD
IRBuilder<> builder(sampleInst);
mlod_r = CombineSampleOrGather4Params(
builder,
sampleInst->getArgOperand(mlod_rParamIndex), // R
sampleInst->getArgOperand(mlodParamIndex), // MLOD
numBits,
std::string("R"),
std::string("MLOD"));
}
sampleInst->setArgOperand(mlod_rParamIndex, mlod_r);
// clear mlod intrinsic params
sampleInst->setArgOperand(mlodParamIndex, zero);
changed = true;
} else if (sampleInst->getIntrinsicID() == GenISAIntrinsic::GenISA_samplePODptr)
{
// Message format for sample_po_d is similar to sample_d format without 3D/Cube/CubeArray support
// sample_po_d u dudx dudy u dvdx dvdy offuvr_r mlod
// Copy MLOD param to the place expected in sample_po_d
changed = true;
sampleInst->setArgOperand(7, sampleInst->getArgOperand(9));
sampleInst->setArgOperand(9, zero);
}
}
}
}
return changed;
}
char FixSampleDInputsPass::ID = 0;
FunctionPass* createFixSampleDInputsPass()
{
return new FixSampleDInputsPass();
}
}
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