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//===- SPIRVLegalizeImplicitBinding.cpp - Legalize implicit bindings ----*- C++
//-*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This pass legalizes the @llvm.spv.resource.handlefromimplicitbinding
// intrinsic by replacing it with a call to
// @llvm.spv.resource.handlefrombinding.
//
//===----------------------------------------------------------------------===//
#include "SPIRV.h"
#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/InstVisitor.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/IntrinsicsSPIRV.h"
#include "llvm/IR/Module.h"
#include "llvm/Pass.h"
#include <algorithm>
#include <vector>
using namespace llvm;
namespace {
class SPIRVLegalizeImplicitBinding : public ModulePass {
public:
static char ID;
SPIRVLegalizeImplicitBinding() : ModulePass(ID) {}
bool runOnModule(Module &M) override;
private:
void collectBindingInfo(Module &M);
uint32_t getAndReserveFirstUnusedBinding(uint32_t DescSet);
void replaceImplicitBindingCalls(Module &M);
// A map from descriptor set to a bit vector of used binding numbers.
std::vector<BitVector> UsedBindings;
// A list of all implicit binding calls, to be sorted by order ID.
SmallVector<CallInst *, 16> ImplicitBindingCalls;
};
struct BindingInfoCollector : public InstVisitor<BindingInfoCollector> {
std::vector<BitVector> &UsedBindings;
SmallVector<CallInst *, 16> &ImplicitBindingCalls;
BindingInfoCollector(std::vector<BitVector> &UsedBindings,
SmallVector<CallInst *, 16> &ImplicitBindingCalls)
: UsedBindings(UsedBindings), ImplicitBindingCalls(ImplicitBindingCalls) {
}
void visitCallInst(CallInst &CI) {
if (CI.getIntrinsicID() == Intrinsic::spv_resource_handlefrombinding) {
const uint32_t DescSet =
cast<ConstantInt>(CI.getArgOperand(0))->getZExtValue();
const uint32_t Binding =
cast<ConstantInt>(CI.getArgOperand(1))->getZExtValue();
if (UsedBindings.size() <= DescSet) {
UsedBindings.resize(DescSet + 1);
UsedBindings[DescSet].resize(64);
}
if (UsedBindings[DescSet].size() <= Binding) {
UsedBindings[DescSet].resize(2 * Binding + 1);
}
UsedBindings[DescSet].set(Binding);
} else if (CI.getIntrinsicID() ==
Intrinsic::spv_resource_handlefromimplicitbinding) {
ImplicitBindingCalls.push_back(&CI);
}
}
};
void SPIRVLegalizeImplicitBinding::collectBindingInfo(Module &M) {
BindingInfoCollector InfoCollector(UsedBindings, ImplicitBindingCalls);
InfoCollector.visit(M);
// Sort the collected calls by their order ID.
std::sort(
ImplicitBindingCalls.begin(), ImplicitBindingCalls.end(),
[](const CallInst *A, const CallInst *B) {
const uint32_t OrderIdArgIdx = 0;
const uint32_t OrderA =
cast<ConstantInt>(A->getArgOperand(OrderIdArgIdx))->getZExtValue();
const uint32_t OrderB =
cast<ConstantInt>(B->getArgOperand(OrderIdArgIdx))->getZExtValue();
return OrderA < OrderB;
});
}
uint32_t SPIRVLegalizeImplicitBinding::getAndReserveFirstUnusedBinding(
uint32_t DescSet) {
if (UsedBindings.size() <= DescSet) {
UsedBindings.resize(DescSet + 1);
UsedBindings[DescSet].resize(64);
}
int NewBinding = UsedBindings[DescSet].find_first_unset();
if (NewBinding == -1) {
NewBinding = UsedBindings[DescSet].size();
UsedBindings[DescSet].resize(2 * NewBinding + 1);
}
UsedBindings[DescSet].set(NewBinding);
return NewBinding;
}
void SPIRVLegalizeImplicitBinding::replaceImplicitBindingCalls(Module &M) {
for (CallInst *OldCI : ImplicitBindingCalls) {
IRBuilder<> Builder(OldCI);
const uint32_t DescSet =
cast<ConstantInt>(OldCI->getArgOperand(1))->getZExtValue();
const uint32_t NewBinding = getAndReserveFirstUnusedBinding(DescSet);
SmallVector<Value *, 8> Args;
Args.push_back(Builder.getInt32(DescSet));
Args.push_back(Builder.getInt32(NewBinding));
// Copy the remaining arguments from the old call.
for (uint32_t i = 2; i < OldCI->arg_size(); ++i) {
Args.push_back(OldCI->getArgOperand(i));
}
Function *NewFunc = Intrinsic::getOrInsertDeclaration(
&M, Intrinsic::spv_resource_handlefrombinding, OldCI->getType());
CallInst *NewCI = Builder.CreateCall(NewFunc, Args);
NewCI->setCallingConv(OldCI->getCallingConv());
OldCI->replaceAllUsesWith(NewCI);
OldCI->eraseFromParent();
}
}
bool SPIRVLegalizeImplicitBinding::runOnModule(Module &M) {
collectBindingInfo(M);
if (ImplicitBindingCalls.empty()) {
return false;
}
replaceImplicitBindingCalls(M);
return true;
}
} // namespace
char SPIRVLegalizeImplicitBinding::ID = 0;
INITIALIZE_PASS(SPIRVLegalizeImplicitBinding, "legalize-spirv-implicit-binding",
"Legalize SPIR-V implicit bindings", false, false)
ModulePass *llvm::createSPIRVLegalizeImplicitBindingPass() {
return new SPIRVLegalizeImplicitBinding();
}
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