| // Copyright 2023 The Tint Authors. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include "src/tint/lang/wgsl/ast/transform/fold_trivial_lets.h" |
| |
| #include "src/tint/lang/wgsl/ast/transform/helper_test.h" |
| |
| namespace tint::ast::transform { |
| namespace { |
| |
| using FoldTrivialLetsTest = TransformTest; |
| |
| TEST_F(FoldTrivialLetsTest, Fold_IdentInitializer_AssignRHS) { |
| auto* src = R"( |
| fn f() { |
| var v = 42; |
| let x = v; |
| v = (x + 1); |
| } |
| )"; |
| |
| auto* expect = R"( |
| fn f() { |
| var v = 42; |
| v = (v + 1); |
| } |
| )"; |
| |
| auto got = Run<FoldTrivialLets>(src); |
| |
| EXPECT_EQ(expect, str(got)); |
| } |
| |
| TEST_F(FoldTrivialLetsTest, Fold_IdentInitializer_IfCondition) { |
| auto* src = R"( |
| fn f() { |
| var v = 42; |
| let x = v; |
| if (x > 0) { |
| v = 0; |
| } |
| } |
| )"; |
| |
| auto* expect = R"( |
| fn f() { |
| var v = 42; |
| if ((v > 0)) { |
| v = 0; |
| } |
| } |
| )"; |
| |
| auto got = Run<FoldTrivialLets>(src); |
| |
| EXPECT_EQ(expect, str(got)); |
| } |
| |
| TEST_F(FoldTrivialLetsTest, NoFold_IdentInitializer_StoreBeforeUse) { |
| auto* src = R"( |
| fn f() { |
| var v = 42; |
| let x = v; |
| v = 0; |
| v = (x + 1); |
| } |
| )"; |
| |
| auto* expect = src; |
| |
| auto got = Run<FoldTrivialLets>(src); |
| |
| EXPECT_EQ(expect, str(got)); |
| } |
| |
| TEST_F(FoldTrivialLetsTest, NoFold_IdentInitializer_SideEffectsInUseExpression) { |
| auto* src = R"( |
| var<private> v = 42; |
| |
| fn g() -> i32 { |
| v = 0; |
| return 1; |
| } |
| |
| fn f() { |
| let x = v; |
| v = (g() + x); |
| } |
| )"; |
| |
| auto* expect = src; |
| |
| auto got = Run<FoldTrivialLets>(src); |
| |
| EXPECT_EQ(expect, str(got)); |
| } |
| |
| TEST_F(FoldTrivialLetsTest, Fold_IdentInitializer_MultiUse) { |
| auto* src = R"( |
| fn f() { |
| var v = 42; |
| let x = v; |
| v = (x + x); |
| } |
| )"; |
| |
| auto* expect = R"( |
| fn f() { |
| var v = 42; |
| v = (v + v); |
| } |
| )"; |
| |
| auto got = Run<FoldTrivialLets>(src); |
| |
| EXPECT_EQ(expect, str(got)); |
| } |
| |
| TEST_F(FoldTrivialLetsTest, Fold_IdentInitializer_MultiUse_OnlySomeInlineable) { |
| auto* src = R"( |
| fn f() { |
| var v = 42; |
| let x = v; |
| v = (x + x); |
| if (x > 0) { |
| v = 0; |
| } |
| } |
| )"; |
| |
| auto* expect = R"( |
| fn f() { |
| var v = 42; |
| let x = v; |
| v = (v + v); |
| if ((x > 0)) { |
| v = 0; |
| } |
| } |
| )"; |
| |
| auto got = Run<FoldTrivialLets>(src); |
| |
| EXPECT_EQ(expect, str(got)); |
| } |
| |
| TEST_F(FoldTrivialLetsTest, Fold_ComplexInitializer_SingleUse) { |
| auto* src = R"( |
| fn f(idx : i32) { |
| var v = array<vec4i, 4>(); |
| let x = v[idx].y; |
| v[0].x = (x + 1); |
| } |
| )"; |
| |
| auto* expect = R"( |
| fn f(idx : i32) { |
| var v = array<vec4i, 4>(); |
| v[0].x = (v[idx].y + 1); |
| } |
| )"; |
| |
| auto got = Run<FoldTrivialLets>(src); |
| |
| EXPECT_EQ(expect, str(got)); |
| } |
| |
| TEST_F(FoldTrivialLetsTest, NoFold_ComplexInitializer_SingleUseWithSideEffects) { |
| auto* src = R"( |
| var<private> i = 0; |
| |
| fn bar() -> i32 { |
| i++; |
| return i; |
| } |
| |
| fn f() -> i32 { |
| var v = array<vec4i, 4>(); |
| let x = v[bar()].y; |
| return (i + x); |
| } |
| )"; |
| |
| auto* expect = src; |
| |
| auto got = Run<FoldTrivialLets>(src); |
| |
| EXPECT_EQ(expect, str(got)); |
| } |
| |
| TEST_F(FoldTrivialLetsTest, NoFold_ComplexInitializer_MultiUse) { |
| auto* src = R"( |
| fn f(idx : i32) { |
| var v = array<vec4i, 4>(); |
| let x = v[idx].y; |
| v[0].x = (x + x); |
| } |
| )"; |
| |
| auto* expect = src; |
| |
| auto got = Run<FoldTrivialLets>(src); |
| |
| EXPECT_EQ(expect, str(got)); |
| } |
| |
| TEST_F(FoldTrivialLetsTest, Fold_ComplexInitializer_SingleUseViaSimpleLet) { |
| auto* src = R"( |
| fn f(a : i32, b : i32, c : i32) -> i32 { |
| let x = ((a * b) + c); |
| let y = x; |
| return y; |
| } |
| )"; |
| |
| auto* expect = R"( |
| fn f(a : i32, b : i32, c : i32) -> i32 { |
| let y = ((a * b) + c); |
| return y; |
| } |
| )"; |
| |
| auto got = Run<FoldTrivialLets>(src); |
| |
| EXPECT_EQ(expect, str(got)); |
| } |
| |
| TEST_F(FoldTrivialLetsTest, Fold_ComplexInitializer_SingleUseViaSimpleLetUsedTwice) { |
| auto* src = R"( |
| fn f(a : i32, b : i32, c : i32) -> i32 { |
| let x = (a * b) + c; |
| let y = x; |
| let z = y + y; |
| return z; |
| } |
| )"; |
| |
| auto* expect = R"( |
| fn f(a : i32, b : i32, c : i32) -> i32 { |
| let x = ((a * b) + c); |
| let z = (x + x); |
| return z; |
| } |
| )"; |
| |
| auto got = Run<FoldTrivialLets>(src); |
| |
| EXPECT_EQ(expect, str(got)); |
| } |
| |
| TEST_F(FoldTrivialLetsTest, Fold_ComplexInitializer_MultiUseUseDifferentLets) { |
| auto* src = R"( |
| fn f(a : i32, b : i32, c : i32) -> i32 { |
| let x = (a * b) + c; |
| let y = x; |
| let z = x + y; |
| return z; |
| } |
| )"; |
| |
| auto* expect = R"( |
| fn f(a : i32, b : i32, c : i32) -> i32 { |
| let x = ((a * b) + c); |
| let z = (x + x); |
| return z; |
| } |
| )"; |
| |
| auto got = Run<FoldTrivialLets>(src); |
| |
| EXPECT_EQ(expect, str(got)); |
| } |
| |
| } // namespace |
| } // namespace tint::ast::transform |