src/tint/writer/spirv/ir/generator_impl_ir_if_test.cc

// 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/writer/spirv/ir/test_helper_ir.h"

using namespace tint::number_suffixes;  // NOLINT

namespace tint::writer::spirv {
namespace {

TEST_F(SpvGeneratorImplTest, If_TrueEmpty_FalseEmpty) {
    auto* func = b.CreateFunction("foo", mod.Types().void_());

    auto* i = b.CreateIf(b.Constant(true));
    i->True()->SetInstructions(utils::Vector{b.Branch(i->Merge())});
    i->False()->SetInstructions(utils::Vector{b.Branch(i->Merge())});
    i->Merge()->SetInstructions(utils::Vector{b.Branch(func->EndTarget())});

    func->StartTarget()->SetInstructions(utils::Vector{i});

    generator_.EmitFunction(func);
    EXPECT_EQ(DumpModule(generator_.Module()), R"(OpName %1 "foo"
%2 = OpTypeVoid
%3 = OpTypeFunction %2
%7 = OpTypeBool
%6 = OpConstantTrue %7
%1 = OpFunction %2 None %3
%4 = OpLabel
OpSelectionMerge %5 None
OpBranchConditional %6 %5 %5
%5 = OpLabel
OpReturn
OpFunctionEnd
)");
}

TEST_F(SpvGeneratorImplTest, If_FalseEmpty) {
    auto* func = b.CreateFunction("foo", mod.Types().void_());

    auto* i = b.CreateIf(b.Constant(true));
    i->False()->SetInstructions(utils::Vector{b.Branch(i->Merge())});
    i->Merge()->SetInstructions(utils::Vector{b.Branch(func->EndTarget())});

    auto* true_block = i->True();
    true_block->SetInstructions(utils::Vector{
        b.Add(mod.Types().i32(), b.Constant(1_i), b.Constant(1_i)), b.Branch(i->Merge())});

    func->StartTarget()->SetInstructions(utils::Vector{i});

    generator_.EmitFunction(func);
    EXPECT_EQ(DumpModule(generator_.Module()), R"(OpName %1 "foo"
%2 = OpTypeVoid
%3 = OpTypeFunction %2
%8 = OpTypeBool
%7 = OpConstantTrue %8
%10 = OpTypeInt 32 1
%11 = OpConstant %10 1
%1 = OpFunction %2 None %3
%4 = OpLabel
OpSelectionMerge %5 None
OpBranchConditional %7 %6 %5
%6 = OpLabel
%9 = OpIAdd %10 %11 %11
OpBranch %5
%5 = OpLabel
OpReturn
OpFunctionEnd
)");
}

TEST_F(SpvGeneratorImplTest, If_TrueEmpty) {
    auto* func = b.CreateFunction("foo", mod.Types().void_());

    auto* i = b.CreateIf(b.Constant(true));
    i->True()->SetInstructions(utils::Vector{b.Branch(i->Merge())});
    i->Merge()->SetInstructions(utils::Vector{b.Branch(func->EndTarget())});

    auto* false_block = i->False();
    false_block->SetInstructions(utils::Vector{
        b.Add(mod.Types().i32(), b.Constant(1_i), b.Constant(1_i)), b.Branch(i->Merge())});

    func->StartTarget()->SetInstructions(utils::Vector{i});

    generator_.EmitFunction(func);
    EXPECT_EQ(DumpModule(generator_.Module()), R"(OpName %1 "foo"
%2 = OpTypeVoid
%3 = OpTypeFunction %2
%8 = OpTypeBool
%7 = OpConstantTrue %8
%10 = OpTypeInt 32 1
%11 = OpConstant %10 1
%1 = OpFunction %2 None %3
%4 = OpLabel
OpSelectionMerge %5 None
OpBranchConditional %7 %5 %6
%6 = OpLabel
%9 = OpIAdd %10 %11 %11
OpBranch %5
%5 = OpLabel
OpReturn
OpFunctionEnd
)");
}

TEST_F(SpvGeneratorImplTest, If_BothBranchesReturn) {
    auto* func = b.CreateFunction("foo", mod.Types().void_());

    auto* i = b.CreateIf(b.Constant(true));
    i->True()->SetInstructions(utils::Vector{b.Branch(func->EndTarget())});
    i->False()->SetInstructions(utils::Vector{b.Branch(func->EndTarget())});

    func->StartTarget()->SetInstructions(utils::Vector{i});

    generator_.EmitFunction(func);
    EXPECT_EQ(DumpModule(generator_.Module()), R"(OpName %1 "foo"
%2 = OpTypeVoid
%3 = OpTypeFunction %2
%9 = OpTypeBool
%8 = OpConstantTrue %9
%1 = OpFunction %2 None %3
%4 = OpLabel
OpSelectionMerge %5 None
OpBranchConditional %8 %6 %7
%6 = OpLabel
OpReturn
%7 = OpLabel
OpReturn
%5 = OpLabel
OpUnreachable
OpFunctionEnd
)");
}

}  // namespace
}  // namespace tint::writer::spirv