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// Copyright 2021 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/transform/remove_phonies.h"
#include <memory>
#include <utility>
#include <vector>
#include "src/transform/test_helper.h"
namespace tint {
namespace transform {
namespace {
using RemovePhoniesTest = TransformTest;
TEST_F(RemovePhoniesTest, EmptyModule) {
auto* src = "";
auto* expect = "";
auto got = Run<RemovePhonies>(src);
EXPECT_EQ(expect, str(got));
}
TEST_F(RemovePhoniesTest, NoSideEffects) {
auto* src = R"(
[[group(0), binding(0)]] var t : texture_2d<f32>;
fn f() {
var v : i32;
_ = &v;
_ = 1;
_ = 1 + 2;
_ = t;
_ = u32(3.0);
_ = f32(i32(4u));
_ = vec2<f32>(5.0);
_ = vec3<i32>(6, 7, 8);
_ = mat2x2<f32>(9.0, 10.0, 11.0, 12.0);
}
)";
auto* expect = R"(
[[group(0), binding(0)]] var t : texture_2d<f32>;
fn f() {
var v : i32;
}
)";
auto got = Run<RemovePhonies>(src);
EXPECT_EQ(expect, str(got));
}
TEST_F(RemovePhoniesTest, SingleSideEffects) {
auto* src = R"(
fn neg(a : i32) -> i32 {
return -(a);
}
fn add(a : i32, b : i32) -> i32 {
return (a + b);
}
fn f() {
_ = neg(1);
_ = add(2, 3);
_ = add(neg(4), neg(5));
_ = u32(neg(6));
_ = f32(add(7, 8));
_ = vec2<f32>(f32(neg(9)));
_ = vec3<i32>(1, neg(10), 3);
_ = mat2x2<f32>(1.0, f32(add(11, 12)), 3.0, 4.0);
}
)";
auto* expect = R"(
fn neg(a : i32) -> i32 {
return -(a);
}
fn add(a : i32, b : i32) -> i32 {
return (a + b);
}
fn f() {
neg(1);
add(2, 3);
add(neg(4), neg(5));
neg(6);
add(7, 8);
neg(9);
neg(10);
add(11, 12);
}
)";
auto got = Run<RemovePhonies>(src);
EXPECT_EQ(expect, str(got));
}
TEST_F(RemovePhoniesTest, MultipleSideEffects) {
auto* src = R"(
fn neg(a : i32) -> i32 {
return -(a);
}
fn add(a : i32, b : i32) -> i32 {
return (a + b);
}
fn xor(a : u32, b : u32) -> u32 {
return (a ^ b);
}
fn f() {
_ = (1 + add(2 + add(3, 4), 5)) * add(6, 7) * neg(8);
_ = add(9, neg(10)) + neg(11);
_ = xor(12u, 13u) + xor(14u, 15u);
_ = neg(16) / neg(17) + add(18, 19);
}
)";
auto* expect = R"(
fn neg(a : i32) -> i32 {
return -(a);
}
fn add(a : i32, b : i32) -> i32 {
return (a + b);
}
fn xor(a : u32, b : u32) -> u32 {
return (a ^ b);
}
fn phony_sink(p0 : i32, p1 : i32, p2 : i32) {
}
fn phony_sink_1(p0 : i32, p1 : i32) {
}
fn phony_sink_2(p0 : u32, p1 : u32) {
}
fn f() {
phony_sink(add((2 + add(3, 4)), 5), add(6, 7), neg(8));
phony_sink_1(add(9, neg(10)), neg(11));
phony_sink_2(xor(12u, 13u), xor(14u, 15u));
phony_sink(neg(16), neg(17), add(18, 19));
}
)";
auto got = Run<RemovePhonies>(src);
EXPECT_EQ(expect, str(got));
}
TEST_F(RemovePhoniesTest, ForLoop) {
auto* src = R"(
struct S {
arr : array<i32>;
};
[[group(0), binding(0)]] var<storage, read_write> s : S;
fn x() -> i32 {
return 0;
}
fn y() -> i32 {
return 0;
}
fn z() -> i32 {
return 0;
}
fn f() {
for (_ = &s.arr; ;_ = &s.arr) {
break;
}
for (_ = x(); ;_ = y() + z()) {
break;
}
}
)";
auto* expect = R"(
struct S {
arr : array<i32>;
};
[[group(0), binding(0)]] var<storage, read_write> s : S;
fn x() -> i32 {
return 0;
}
fn y() -> i32 {
return 0;
}
fn z() -> i32 {
return 0;
}
fn phony_sink(p0 : i32, p1 : i32) {
}
fn f() {
for(; ; ) {
break;
}
for(x(); ; phony_sink(y(), z())) {
break;
}
}
)";
auto got = Run<RemovePhonies>(src);
EXPECT_EQ(expect, str(got));
}
} // namespace
} // namespace transform
} // namespace tint