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// 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/spirv/writer/common/helper_test.h"
namespace tint::spirv::writer {
namespace {
using namespace tint::core::fluent_types; // NOLINT
using namespace tint::core::number_suffixes; // NOLINT
TEST_F(SpirvWriterTest, Discard) {
auto* buffer = b.Var("buffer", ty.ptr<storage, i32>());
buffer->SetBindingPoint(0, 0);
b.RootBlock()->Append(buffer);
auto* front_facing = b.FunctionParam("front_facing", ty.bool_());
front_facing->SetBuiltin(core::ir::FunctionParam::Builtin::kFrontFacing);
auto* ep = b.Function("ep", ty.f32(), core::ir::Function::PipelineStage::kFragment);
ep->SetParams({front_facing});
ep->SetReturnLocation(0_u, {});
b.Append(ep->Block(), [&] {
auto* ifelse = b.If(front_facing);
b.Append(ifelse->True(), [&] { //
b.Discard();
b.ExitIf(ifelse);
});
b.Store(buffer, 42_i);
b.Return(ep, 0.5_f);
});
ASSERT_TRUE(Generate()) << Error() << output_;
EXPECT_INST(R"(
%ep_inner = OpFunction %float None %16
%front_facing = OpFunctionParameter %bool
%17 = OpLabel
OpSelectionMerge %18 None
OpBranchConditional %front_facing %19 %18
%19 = OpLabel
OpStore %continue_execution %false
OpBranch %18
%18 = OpLabel
%21 = OpAccessChain %_ptr_StorageBuffer_int %1 %uint_0
%25 = OpLoad %bool %continue_execution
OpSelectionMerge %26 None
OpBranchConditional %25 %27 %26
%27 = OpLabel
OpStore %21 %int_42
OpBranch %26
%26 = OpLabel
%29 = OpLoad %bool %continue_execution
%30 = OpLogicalEqual %bool %29 %false
OpSelectionMerge %31 None
OpBranchConditional %30 %32 %31
%32 = OpLabel
OpKill
%31 = OpLabel
OpReturnValue %float_0_5
OpFunctionEnd
)");
}
} // namespace
} // namespace tint::spirv::writer