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// Copyright 2023 The Dawn & Tint Authors
//
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// this list of conditions and the following disclaimer in the documentation
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#include "src/tint/lang/spirv/writer/raise/handle_matrix_arithmetic.h"
#include <utility>
#include "src/tint/lang/core/fluent_types.h"
#include "src/tint/lang/core/ir/builder.h"
#include "src/tint/lang/core/ir/module.h"
#include "src/tint/lang/core/ir/validator.h"
#include "src/tint/lang/core/type/matrix.h"
#include "src/tint/lang/spirv/ir/builtin_call.h"
#include "src/tint/utils/ice/ice.h"
using namespace tint::core::number_suffixes; // NOLINT
using namespace tint::core::fluent_types; // NOLINT
namespace tint::spirv::writer::raise {
namespace {
void Run(core::ir::Module& ir) {
core::ir::Builder b{ir};
// Find the instructions that need to be modified.
Vector<core::ir::CoreBinary*, 4> binary_worklist;
Vector<core::ir::Convert*, 4> convert_worklist;
for (auto* inst : ir.instructions.Objects()) {
if (!inst->Alive()) {
continue;
}
if (auto* binary = inst->As<core::ir::CoreBinary>()) {
TINT_ASSERT(binary->Operands().Length() == 2);
if (binary->LHS()->Type()->Is<core::type::Matrix>() ||
binary->RHS()->Type()->Is<core::type::Matrix>()) {
binary_worklist.Push(binary);
}
} else if (auto* convert = inst->As<core::ir::Convert>()) {
if (convert->Result(0)->Type()->Is<core::type::Matrix>()) {
convert_worklist.Push(convert);
}
}
}
// Replace the matrix arithmetic instructions that we found.
for (auto* binary : binary_worklist) {
auto* lhs = binary->LHS();
auto* rhs = binary->RHS();
auto* lhs_ty = lhs->Type();
auto* rhs_ty = rhs->Type();
auto* ty = binary->Result(0)->Type();
// Helper to replace the instruction with a new one.
auto replace = [&](core::ir::Instruction* inst) {
if (auto name = ir.NameOf(binary)) {
ir.SetName(inst->Result(0), name);
}
binary->Result(0)->ReplaceAllUsesWith(inst->Result(0));
binary->ReplaceWith(inst);
binary->Destroy();
};
// Helper to replace the instruction with a column-wise operation.
auto column_wise = [&](auto op) {
auto* mat = ty->As<core::type::Matrix>();
Vector<core::ir::Value*, 4> args;
for (uint32_t col = 0; col < mat->columns(); col++) {
b.InsertBefore(binary, [&] {
auto* lhs_col = b.Access(mat->ColumnType(), lhs, u32(col));
auto* rhs_col = b.Access(mat->ColumnType(), rhs, u32(col));
auto* add = b.Binary(op, mat->ColumnType(), lhs_col, rhs_col);
args.Push(add->Result(0));
});
}
replace(b.Construct(ty, std::move(args)));
};
switch (binary->Op()) {
case core::BinaryOp::kAdd:
column_wise(core::BinaryOp::kAdd);
break;
case core::BinaryOp::kSubtract:
column_wise(core::BinaryOp::kSubtract);
break;
case core::BinaryOp::kMultiply:
// Select the SPIR-V intrinsic that corresponds to the operation being performed.
if (lhs_ty->Is<core::type::Matrix>()) {
if (rhs_ty->Is<core::type::Scalar>()) {
replace(b.Call<spirv::ir::BuiltinCall>(
ty, spirv::BuiltinFn::kMatrixTimesScalar, lhs, rhs));
} else if (rhs_ty->Is<core::type::Vector>()) {
replace(b.Call<spirv::ir::BuiltinCall>(
ty, spirv::BuiltinFn::kMatrixTimesVector, lhs, rhs));
} else if (rhs_ty->Is<core::type::Matrix>()) {
replace(b.Call<spirv::ir::BuiltinCall>(
ty, spirv::BuiltinFn::kMatrixTimesMatrix, lhs, rhs));
}
} else {
if (lhs_ty->Is<core::type::Scalar>()) {
replace(b.Call<spirv::ir::BuiltinCall>(
ty, spirv::BuiltinFn::kMatrixTimesScalar, rhs, lhs));
} else if (lhs_ty->Is<core::type::Vector>()) {
replace(b.Call<spirv::ir::BuiltinCall>(
ty, spirv::BuiltinFn::kVectorTimesMatrix, lhs, rhs));
}
}
break;
default:
TINT_UNREACHABLE() << "unhandled matrix arithmetic instruction";
break;
}
}
// Replace the matrix convert instructions that we found.
for (auto* convert : convert_worklist) {
auto* arg = convert->Args()[core::ir::Convert::kValueOperandOffset];
auto* in_mat = arg->Type()->As<core::type::Matrix>();
auto* out_mat = convert->Result(0)->Type()->As<core::type::Matrix>();
// Extract and convert each column separately.
Vector<core::ir::Value*, 4> args;
for (uint32_t c = 0; c < out_mat->columns(); c++) {
b.InsertBefore(convert, [&] {
auto* col = b.Access(in_mat->ColumnType(), arg, u32(c));
auto* new_col = b.Convert(out_mat->ColumnType(), col);
args.Push(new_col->Result(0));
});
}
// Reconstruct the result matrix from the converted columns.
auto* construct = b.Construct(out_mat, std::move(args));
if (auto name = ir.NameOf(convert)) {
ir.SetName(construct->Result(0), name);
}
convert->Result(0)->ReplaceAllUsesWith(construct->Result(0));
convert->ReplaceWith(construct);
convert->Destroy();
}
}
} // namespace
Result<SuccessType> HandleMatrixArithmetic(core::ir::Module& ir) {
auto result = ValidateAndDumpIfNeeded(ir, "HandleMatrixArithmetic transform");
if (result != Success) {
return result.Failure();
}
Run(ir);
return Success;
}
} // namespace tint::spirv::writer::raise