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/*
* Copyright © 2014 Intel Corporation
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
* This pass is to solve the __gen_ocl_sampler_need_fix() and
* __gen_ocl_sampler_need_rounding_fix(), as for some special
* sampler type, we need some extra work around operations to
* make sure to get correct pixel value. But for some other
* sampler, we don't need those work around code.
*/
#include "llvm/IR/Instructions.h"
#include "llvm/Pass.h"
#include "llvm/PassManager.h"
#include "llvm/Config/llvm-config.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/PostOrderIterator.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/InstrTypes.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/Module.h"
#include "llvm/Pass.h"
#include "llvm/IR/IRBuilder.h"
#if LLVM_VERSION_MINOR >= 5
#include "llvm/IR/CFG.h"
#else
#include "llvm/Support/CFG.h"
#endif
#include "llvm/Analysis/ConstantsScanner.h"
#include "llvm_gen_backend.hpp"
#include "ocl_common_defines.h"
using namespace llvm;
namespace gbe {
class SamplerFix : public FunctionPass {
public:
SamplerFix() : FunctionPass(ID) {
#if LLVM_VERSION_MAJOR == 3 && LLVM_VERSION_MINOR >= 5
initializeDominatorTreeWrapperPassPass(*PassRegistry::getPassRegistry());
#else
initializeDominatorTreePass(*PassRegistry::getPassRegistry());
#endif
}
bool visitCallInst(CallInst *I) {
Value *Callee = I->getCalledValue();
const std::string fnName = Callee->getName();
bool changed = false;
Type *boolTy = IntegerType::get(I->getContext(), 1);
Type *i32Ty = IntegerType::get(I->getContext(), 32);
if (fnName.compare("__gen_ocl_sampler_need_fix") == 0) {
// return (((sampler & __CLK_ADDRESS_MASK) == CLK_ADDRESS_CLAMP) &&
// ((sampler & __CLK_FILTER_MASK) == CLK_FILTER_NEAREST));
bool needFix = true;
Value *needFixVal;
if (dyn_cast<ConstantInt>(I->getOperand(0))) {
const ConstantInt *ci = dyn_cast<ConstantInt>(I->getOperand(0));
uint32_t samplerInt = ci->getZExtValue();
needFix = ((samplerInt & __CLK_ADDRESS_MASK) == CLK_ADDRESS_CLAMP &&
(samplerInt & __CLK_FILTER_MASK) == CLK_FILTER_NEAREST);
needFixVal = ConstantInt::get(boolTy, needFix);
} else {
IRBuilder<> Builder(I->getParent());
Builder.SetInsertPoint(I);
Value *addressMask = ConstantInt::get(i32Ty, __CLK_ADDRESS_MASK);
Value *addressMode = Builder.CreateAnd(I->getOperand(0), addressMask);
Value *clampInt = ConstantInt::get(i32Ty, CLK_ADDRESS_CLAMP);
Value *isClampMode = Builder.CreateICmpEQ(addressMode, clampInt);
Value *filterMask = ConstantInt::get(i32Ty, __CLK_FILTER_MASK);
Value *filterMode = Builder.CreateAnd(I->getOperand(0), filterMask);
Value *nearestInt = ConstantInt::get(i32Ty, CLK_FILTER_NEAREST);
Value *isNearestMode = Builder.CreateICmpEQ(filterMode, nearestInt);
needFixVal = Builder.CreateAnd(isClampMode, isNearestMode);
}
I->replaceAllUsesWith(needFixVal);
changed = true;
} else if (fnName.compare("__gen_ocl_sampler_need_rounding_fix") == 0) {
// return ((sampler & CLK_NORMALIZED_COORDS_TRUE) == 0);
bool needFix = true;
Value *needFixVal;
if (dyn_cast<ConstantInt>(I->getOperand(0))) {
const ConstantInt *ci = dyn_cast<ConstantInt>(I->getOperand(0));
uint32_t samplerInt = ci->getZExtValue();
needFix = samplerInt & CLK_NORMALIZED_COORDS_TRUE;
needFixVal = ConstantInt::get(boolTy, needFix);
} else {
IRBuilder<> Builder(I->getParent());
Builder.SetInsertPoint(I);
Value *normalizeMask = ConstantInt::get(i32Ty, CLK_NORMALIZED_COORDS_TRUE);
Value *normalizeMode = Builder.CreateAnd(I->getOperand(0), normalizeMask);
needFixVal = Builder.CreateICmpEQ(normalizeMode, ConstantInt::get(i32Ty, 0));
}
I->replaceAllUsesWith(needFixVal);
changed = true;
}
return changed;
}
bool runOnFunction(Function& F) {
bool changed = false;
std::set<Instruction*> deadInsnSet;
for (inst_iterator I = inst_begin(&F), E = inst_end(&F); I != E; ++I) {
if (dyn_cast<CallInst>(&*I)) {
if (visitCallInst(dyn_cast<CallInst>(&*I))) {
changed = true;
deadInsnSet.insert(&*I);
}
}
}
for (auto it: deadInsnSet)
it->eraseFromParent();
return changed;
}
static char ID;
};
FunctionPass* createSamplerFixPass() {
return new SamplerFix();
}
char SamplerFix::ID = 0;
};
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