| // Copyright 2023 The Dawn & Tint Authors |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are met: |
| // |
| // 1. Redistributions of source code must retain the above copyright notice, this |
| // list of conditions and the following disclaimer. |
| // |
| // 2. Redistributions in binary form must reproduce the above copyright notice, |
| // this list of conditions and the following disclaimer in the documentation |
| // and/or other materials provided with the distribution. |
| // |
| // 3. Neither the name of the copyright holder nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #include "src/tint/lang/spirv/reader/ast_lower/fold_trivial_lets.h" |
| |
| #include "src/tint/lang/wgsl/ast/transform/helper_test.h" |
| |
| namespace tint::spirv::reader { |
| namespace { |
| |
| using FoldTrivialLetsTest = ast::transform::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::spirv::reader |