src/tint/lang/hlsl/writer/loop_test.cc

// Copyright 2024 The Dawn & Tint Authors
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#include "src/tint/lang/hlsl/writer/helper_test.h"

using namespace tint::core::fluent_types;     // NOLINT
using namespace tint::core::number_suffixes;  // NOLINT

namespace tint::hlsl::writer {
namespace {

TEST_F(HlslWriterTest, Loop) {
    auto* func = b.Function("a", ty.void_(), core::ir::Function::PipelineStage::kCompute);
    func->SetWorkgroupSize(1, 1, 1);

    b.Append(func->Block(), [&] {
        auto* l = b.Loop();
        b.Append(l->Body(), [&] { b.ExitLoop(l); });
        b.Append(l->Continuing(), [&] { b.NextIteration(l); });
        b.Return(func);
    });

    ASSERT_TRUE(Generate()) << err_ << output_.hlsl;
    EXPECT_EQ(output_.hlsl, R"(
[numthreads(1, 1, 1)]
void a() {
  {
    while(true) {
      break;
    }
  }
}

)");
}

TEST_F(HlslWriterTest, LoopContinueAndBreakIf) {
    auto* func = b.Function("a", ty.void_(), core::ir::Function::PipelineStage::kCompute);
    func->SetWorkgroupSize(1, 1, 1);

    b.Append(func->Block(), [&] {
        auto* l = b.Loop();
        b.Append(l->Body(), [&] { b.Continue(l); });
        b.Append(l->Continuing(), [&] { b.BreakIf(l, true); });
        b.Return(func);
    });

    ASSERT_TRUE(Generate()) << err_ << output_.hlsl;
    EXPECT_EQ(output_.hlsl, R"(
[numthreads(1, 1, 1)]
void a() {
  {
    while(true) {
      {
        if (true) { break; }
      }
      continue;
    }
  }
}

)");
}

TEST_F(HlslWriterTest, LoopBodyVarInContinue) {
    auto* func = b.Function("a", ty.void_(), core::ir::Function::PipelineStage::kCompute);
    func->SetWorkgroupSize(1, 1, 1);

    b.Append(func->Block(), [&] {
        auto* l = b.Loop();
        b.Append(l->Body(), [&] {
            auto* v = b.Var("v", true);
            b.Continue(l);

            b.Append(l->Continuing(), [&] { b.BreakIf(l, v); });
        });
        b.Return(func);
    });

    ASSERT_TRUE(Generate()) << err_ << output_.hlsl;
    EXPECT_EQ(output_.hlsl, R"(
[numthreads(1, 1, 1)]
void a() {
  {
    while(true) {
      bool v = true;
      {
        if (v) { break; }
      }
      continue;
    }
  }
}

)");
}

TEST_F(HlslWriterTest, LoopInitializer) {
    auto* func = b.Function("a", ty.void_(), core::ir::Function::PipelineStage::kCompute);
    func->SetWorkgroupSize(1, 1, 1);

    b.Append(func->Block(), [&] {
        auto* l = b.Loop();
        b.Append(l->Initializer(), [&] {
            auto* v = b.Var("v", true);
            b.NextIteration(l);

            b.Append(l->Body(), [&] { b.Continue(l); });
            b.Append(l->Continuing(), [&] { b.BreakIf(l, v); });
        });
        b.Return(func);
    });

    ASSERT_TRUE(Generate()) << err_ << output_.hlsl;
    EXPECT_EQ(output_.hlsl, R"(
[numthreads(1, 1, 1)]
void a() {
  {
    bool v = true;
    while(true) {
      {
        if (v) { break; }
      }
      continue;
    }
  }
}

)");
}

}  // namespace
}  // namespace tint::hlsl::writer