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//===- DXILResourceImplicitBinding.cpp -----------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "DXILResourceImplicitBinding.h"
#include "DirectX.h"
#include "llvm/ADT/APInt.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Analysis/DXILResource.h"
#include "llvm/IR/Analysis.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DiagnosticInfo.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/IntrinsicsDirectX.h"
#include "llvm/IR/Module.h"
#include "llvm/InitializePasses.h"
#include <cstdint>
#define DEBUG_TYPE "dxil-resource-implicit-binding"
using namespace llvm;
using namespace llvm::dxil;
namespace {
static void diagnoseImplicitBindingNotFound(CallInst *ImplBindingCall) {
Function *F = ImplBindingCall->getFunction();
LLVMContext &Context = F->getParent()->getContext();
// FIXME: include the name of the resource in the error message
// (llvm/llvm-project#137868)
Context.diagnose(
DiagnosticInfoGenericWithLoc("resource cannot be allocated", *F,
ImplBindingCall->getDebugLoc(), DS_Error));
}
static bool assignBindings(Module &M, DXILResourceBindingInfo &DRBI,
DXILResourceTypeMap &DRTM) {
struct ImplicitBindingCall {
int OrderID;
CallInst *Call;
ImplicitBindingCall(int OrderID, CallInst *Call)
: OrderID(OrderID), Call(Call) {}
};
SmallVector<ImplicitBindingCall> Calls;
SmallVector<Function *> FunctionsToMaybeRemove;
// collect all of the llvm.dx.resource.handlefromImplicitbinding calls
for (Function &F : M.functions()) {
if (!F.isDeclaration())
continue;
if (F.getIntrinsicID() != Intrinsic::dx_resource_handlefromimplicitbinding)
continue;
for (User *U : F.users()) {
if (CallInst *CI = dyn_cast<CallInst>(U)) {
int OrderID = cast<ConstantInt>(CI->getArgOperand(0))->getZExtValue();
Calls.emplace_back(OrderID, CI);
}
}
FunctionsToMaybeRemove.emplace_back(&F);
}
// sort all the collected implicit bindings by OrderID
llvm::stable_sort(
Calls, [](auto &LHS, auto &RHS) { return LHS.OrderID < RHS.OrderID; });
// iterate over sorted calls, find binding for each new OrderID and replace
// each call with dx_resource_handlefrombinding using the new binding
int LastOrderID = -1;
llvm::TargetExtType *HandleTy = nullptr;
ConstantInt *RegSlotOp = nullptr;
bool AllBindingsAssigned = true;
bool Changed = false;
for (ImplicitBindingCall &IB : Calls) {
IRBuilder<> Builder(IB.Call);
if (IB.OrderID != LastOrderID) {
LastOrderID = IB.OrderID;
HandleTy = cast<TargetExtType>(IB.Call->getType());
ResourceTypeInfo &RTI = DRTM[HandleTy];
uint32_t Space =
cast<ConstantInt>(IB.Call->getArgOperand(1))->getZExtValue();
int32_t Size =
cast<ConstantInt>(IB.Call->getArgOperand(2))->getZExtValue();
std::optional<uint32_t> RegSlot =
DRBI.findAvailableBinding(RTI.getResourceClass(), Space, Size);
if (!RegSlot) {
diagnoseImplicitBindingNotFound(IB.Call);
AllBindingsAssigned = false;
continue;
}
RegSlotOp = ConstantInt::get(Builder.getInt32Ty(), RegSlot.value());
}
if (!RegSlotOp)
continue;
auto *NewCall = Builder.CreateIntrinsic(
HandleTy, Intrinsic::dx_resource_handlefrombinding,
{IB.Call->getOperand(1), /* space */
RegSlotOp, /* register slot */
IB.Call->getOperand(2), /* size */
IB.Call->getOperand(3), /* index */
IB.Call->getOperand(4), /* non-uniform flag */
IB.Call->getOperand(5)}); /* name */
IB.Call->replaceAllUsesWith(NewCall);
IB.Call->eraseFromParent();
Changed = true;
}
for (Function *F : FunctionsToMaybeRemove) {
if (F->user_empty()) {
F->eraseFromParent();
Changed = true;
}
}
DRBI.setHasImplicitBinding(!AllBindingsAssigned);
return Changed;
}
} // end anonymous namespace
PreservedAnalyses DXILResourceImplicitBinding::run(Module &M,
ModuleAnalysisManager &AM) {
DXILResourceBindingInfo &DRBI = AM.getResult<DXILResourceBindingAnalysis>(M);
DXILResourceTypeMap &DRTM = AM.getResult<DXILResourceTypeAnalysis>(M);
if (!DRBI.hasImplicitBinding())
return PreservedAnalyses::all();
if (!assignBindings(M, DRBI, DRTM))
return PreservedAnalyses::all();
PreservedAnalyses PA;
PA.preserve<DXILResourceBindingAnalysis>();
PA.preserve<DXILResourceTypeAnalysis>();
return PA;
}
namespace {
class DXILResourceImplicitBindingLegacy : public ModulePass {
public:
DXILResourceImplicitBindingLegacy() : ModulePass(ID) {}
bool runOnModule(Module &M) override {
DXILResourceTypeMap &DRTM =
getAnalysis<DXILResourceTypeWrapperPass>().getResourceTypeMap();
DXILResourceBindingInfo &DRBI =
getAnalysis<DXILResourceBindingWrapperPass>().getBindingInfo();
if (DRBI.hasImplicitBinding())
return assignBindings(M, DRBI, DRTM);
return false;
}
static char ID; // Pass identification.
void getAnalysisUsage(llvm::AnalysisUsage &AU) const override {
AU.addRequired<DXILResourceTypeWrapperPass>();
AU.addRequired<DXILResourceBindingWrapperPass>();
AU.addPreserved<DXILResourceTypeWrapperPass>();
AU.addPreserved<DXILResourceBindingWrapperPass>();
}
};
char DXILResourceImplicitBindingLegacy::ID = 0;
} // end anonymous namespace
INITIALIZE_PASS_BEGIN(DXILResourceImplicitBindingLegacy, DEBUG_TYPE,
"DXIL Resource Implicit Binding", false, false)
INITIALIZE_PASS_DEPENDENCY(DXILResourceTypeWrapperPass)
INITIALIZE_PASS_DEPENDENCY(DXILResourceBindingWrapperPass)
INITIALIZE_PASS_END(DXILResourceImplicitBindingLegacy, DEBUG_TYPE,
"DXIL Resource Implicit Binding", false, false)
ModulePass *llvm::createDXILResourceImplicitBindingLegacyPass() {
return new DXILResourceImplicitBindingLegacy();
}
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