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docs/ -> docs/tint/ fuzzers/ -> src/tint/fuzzers/ samples/ -> src/tint/cmd/ src/ -> src/tint/ test/ -> test/tint/ BUG=tint:1418,tint:1433 Change-Id: Id2aa79f989aef3245b80ef4aa37a27ff16cd700b Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/80482 Kokoro: Kokoro <noreply+kokoro@google.com> Reviewed-by: Ben Clayton <bclayton@google.com> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
69 lines
2.3 KiB
C++
69 lines
2.3 KiB
C++
// Copyright 2022 The Tint Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "src/tint/transform/var_for_dynamic_index.h"
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#include "src/tint/program_builder.h"
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#include "src/tint/transform/utils/hoist_to_decl_before.h"
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namespace tint::transform {
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VarForDynamicIndex::VarForDynamicIndex() = default;
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VarForDynamicIndex::~VarForDynamicIndex() = default;
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void VarForDynamicIndex::Run(CloneContext& ctx,
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const DataMap&,
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DataMap&) const {
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HoistToDeclBefore hoist_to_decl_before(ctx);
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// Extracts array and matrix values that are dynamically indexed to a
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// temporary `var` local that is then indexed.
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auto dynamic_index_to_var =
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[&](const ast::IndexAccessorExpression* access_expr) {
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auto* index_expr = access_expr->index;
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auto* object_expr = access_expr->object;
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auto& sem = ctx.src->Sem();
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if (sem.Get(index_expr)->ConstantValue()) {
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// Index expression resolves to a compile time value.
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// As this isn't a dynamic index, we can ignore this.
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return true;
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}
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auto* indexed = sem.Get(object_expr);
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if (!indexed->Type()->IsAnyOf<sem::Array, sem::Matrix>()) {
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// We only care about array and matrices.
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return true;
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}
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// TODO(bclayton): group multiple accesses in the same object.
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// e.g. arr[i] + arr[i+1] // Don't create two vars for this
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return hoist_to_decl_before.Add(indexed, object_expr, false,
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"var_for_index");
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};
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for (auto* node : ctx.src->ASTNodes().Objects()) {
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if (auto* access_expr = node->As<ast::IndexAccessorExpression>()) {
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if (!dynamic_index_to_var(access_expr)) {
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return;
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}
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}
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}
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hoist_to_decl_before.Apply();
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ctx.Clone();
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}
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} // namespace tint::transform
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