src/tint/utils/containers/bitset_test.cc

// Copyright 2022 The Dawn & Tint Authors
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#include "src/tint/utils/containers/bitset.h"

#include "gtest/gtest.h"

namespace tint {
namespace {

TEST(Bitset, Length) {
    Bitset<8> bits;
    EXPECT_EQ(bits.Length(), 0u);
    bits.Resize(100u);
    EXPECT_EQ(bits.Length(), 100u);
}

TEST(Bitset, AllBitsZero) {
    Bitset<8> bits;
    EXPECT_TRUE(bits.AllBitsZero());

    bits.Resize(4u);
    EXPECT_TRUE(bits.AllBitsZero());

    bits.Resize(100u);
    EXPECT_TRUE(bits.AllBitsZero());

    bits[63] = true;
    EXPECT_FALSE(bits.AllBitsZero());

    bits.Resize(60);
    EXPECT_TRUE(bits.AllBitsZero());

    bits.Resize(64);
    EXPECT_TRUE(bits.AllBitsZero());

    bits[4] = true;
    EXPECT_FALSE(bits.AllBitsZero());

    bits.Resize(8);
    EXPECT_FALSE(bits.AllBitsZero());
}

TEST(Bitset, InitCleared_NoSpill) {
    Bitset<256> bits;
    bits.Resize(256);
    for (size_t i = 0; i < 256; i++) {
        EXPECT_FALSE(bits[i]);
    }
}

TEST(Bitset, InitCleared_Spill) {
    Bitset<64> bits;
    bits.Resize(256);
    for (size_t i = 0; i < 256; i++) {
        EXPECT_FALSE(bits[i]);
    }
}

TEST(Bitset, ReadWrite_NoSpill) {
    Bitset<256> bits;
    bits.Resize(256);
    for (size_t i = 0; i < 256; i++) {
        bits[i] = (i & 0x2) == 0;
    }
    for (size_t i = 0; i < 256; i++) {
        EXPECT_EQ(bits[i], (i & 0x2) == 0);
    }
}

TEST(Bitset, ReadWrite_Spill) {
    Bitset<64> bits;
    bits.Resize(256);
    for (size_t i = 0; i < 256; i++) {
        bits[i] = (i & 0x2) == 0;
    }
    for (size_t i = 0; i < 256; i++) {
        EXPECT_EQ(bits[i], (i & 0x2) == 0);
    }
}

TEST(Bitset, ShinkGrowAlignedClears_NoSpill) {
    Bitset<256> bits;
    bits.Resize(256);
    for (size_t i = 0; i < 256; i++) {
        bits[i] = true;
    }
    bits.Resize(64);
    bits.Resize(256);
    for (size_t i = 0; i < 256; i++) {
        EXPECT_EQ(bits[i], i < 64u);
    }
}

TEST(Bitset, ShinkGrowAlignedClears_Spill) {
    Bitset<64> bits;
    bits.Resize(256);
    for (size_t i = 0; i < 256; i++) {
        bits[i] = true;
    }
    bits.Resize(64);
    bits.Resize(256);
    for (size_t i = 0; i < 256; i++) {
        EXPECT_EQ(bits[i], i < 64u);
    }
}
TEST(Bitset, ShinkGrowMisalignedClears_NoSpill) {
    Bitset<256> bits;
    bits.Resize(256);
    for (size_t i = 0; i < 256; i++) {
        bits[i] = true;
    }
    bits.Resize(42);
    bits.Resize(256);
    for (size_t i = 0; i < 256; i++) {
        EXPECT_EQ(bits[i], i < 42u);
    }
}

TEST(Bitset, ShinkGrowMisalignedClears_Spill) {
    Bitset<64> bits;
    bits.Resize(256);
    for (size_t i = 0; i < 256; i++) {
        bits[i] = true;
    }
    bits.Resize(42);
    bits.Resize(256);
    for (size_t i = 0; i < 256; i++) {
        EXPECT_EQ(bits[i], i < 42u);
    }
}

}  // namespace
}  // namespace tint