src/tint/lang/spirv/reader/lower/lower.cc

// Copyright 2024 The Dawn & Tint Authors
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#include "src/tint/lang/spirv/reader/lower/lower.h"

#include "src/tint/lang/core/ir/transform/dead_code_elimination.h"
#include "src/tint/lang/core/ir/transform/remove_terminator_args.h"
#include "src/tint/lang/core/ir/validator.h"
#include "src/tint/lang/spirv/reader/lower/atomics.h"
#include "src/tint/lang/spirv/reader/lower/builtins.h"
#include "src/tint/lang/spirv/reader/lower/decompose_strided_array.h"
#include "src/tint/lang/spirv/reader/lower/decompose_strided_matrix.h"
#include "src/tint/lang/spirv/reader/lower/shader_io.h"
#include "src/tint/lang/spirv/reader/lower/texture.h"
#include "src/tint/lang/spirv/reader/lower/transpose_row_major.h"
#include "src/tint/lang/spirv/reader/lower/vector_element_pointer.h"

namespace tint::spirv::reader {

Result<SuccessType> Lower(core::ir::Module& mod) {
    TINT_CHECK_RESULT(core::ir::transform::DeadCodeElimination(mod));
    TINT_CHECK_RESULT(lower::VectorElementPointer(mod));
    TINT_CHECK_RESULT(lower::ShaderIO(mod));
    TINT_CHECK_RESULT(lower::Builtins(mod));

    // TransposeRowMajor must come before DecomposeStridedMatrix as we need to convert the matrices
    // first.
    TINT_CHECK_RESULT(lower::TransposeRowMajor(mod));
    // DecomposeStridedMatrix must come before DecomposeStridedArray, as it introduces strided
    // arrays that need to be replaced.
    TINT_CHECK_RESULT(lower::DecomposeStridedMatrix(mod));
    TINT_CHECK_RESULT(lower::DecomposeStridedArray(mod));
    TINT_CHECK_RESULT(lower::Atomics(mod));
    TINT_CHECK_RESULT(lower::Texture(mod));

    // Remove the terminator args at this point. There are no logical short-circuiting operators in
    // SPIR-V that we will lose track of, all the terminators are for hoisted values. We don't do
    // this on WGSL raise because `RemoveTerminatorArgs` loses the ability to determine logical `&&`
    // and `||` operators based on the terminators. Moving the logical detection to a separate
    // transform is also complicated because of the way it currently detects multi element `&&` and
    // `||` statements.
    TINT_CHECK_RESULT(core::ir::transform::RemoveTerminatorArgs(mod));

    TINT_CHECK_RESULT(
        core::ir::ValidateAndDumpIfNeeded(mod, "spirv.Lower",
                                          core::ir::Capabilities{
                                              core::ir::Capability::kAllowMultipleEntryPoints,
                                              core::ir::Capability::kAllowOverrides,
                                          },
                                          "after"));

    return Success;
}

}  // namespace tint::spirv::reader