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// Copyright 2023 The Dawn & Tint Authors
//
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// modification, are permitted provided that the following conditions are met:
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// 1. Redistributions of source code must retain the above copyright notice, this
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#include "src/tint/lang/core/ir/transform/combine_access_instructions.h"
#include <utility>
#include "src/tint/lang/core/ir/builder.h"
#include "src/tint/lang/core/ir/module.h"
#include "src/tint/lang/core/ir/validator.h"
using namespace tint::core::fluent_types; // NOLINT
using namespace tint::core::number_suffixes; // NOLINT
namespace tint::core::ir::transform {
namespace {
/// PIMPL state for the transform.
struct State {
/// The IR module.
Module& ir;
/// Process the module.
void Process() {
// Loop over every instruction looking for access instructions.
for (auto* inst : ir.Instructions()) {
if (auto* access = inst->As<ir::Access>()) {
// Look for places where the result of this access instruction is used as a base
// pointer for another access instruction.
access->Result(0)->ForEachUse([&](Usage use) {
auto* child = use.instruction->As<ir::Access>();
if (child && use.operand_index == ir::Access::kObjectOperandOffset) {
// Push the indices of the parent access instruction into the child.
Vector<ir::Value*, 4> operands;
operands.Push(access->Object());
for (auto* idx : access->Indices()) {
operands.Push(idx);
}
for (auto* idx : child->Indices()) {
operands.Push(idx);
}
child->SetOperands(std::move(operands));
}
});
// If there are no other uses of the access instruction, remove it.
if (access->Result(0)->Usages().IsEmpty()) {
access->Destroy();
}
}
}
}
};
} // namespace
Result<SuccessType> CombineAccessInstructions(Module& ir) {
auto result = ValidateAndDumpIfNeeded(ir, "CombineAccessInstructions transform");
if (result != Success) {
return result;
}
State{ir}.Process();
return Success;
}
} // namespace tint::core::ir::transform