Add bit manip tests

Author: AntoinePrv

test/CMakeLists.txt

@@ -164,6 +164,7 @@ set(XSIMD_TESTS
     test_sum.cpp
     test_traits.cpp
     test_trigonometric.cpp
+    test_utils_bits.cpp
     test_xsimd_api.cpp
     test_utils.hpp
 )

test/test_utils_bits.cpp

@@ -0,0 +1,120 @@
+/***************************************************************************
+ * Copyright (c) Johan Mabille, Sylvain Corlay, Wolf Vollprecht and         *
+ * Martin Renou                                                             *
+ * Copyright (c) QuantStack                                                 *
+ * Copyright (c) Serge Guelton                                              *
+ *                                                                          *
+ * Distributed under the terms of the BSD 3-Clause License.                 *
+ *                                                                          *
+ * The full license is in the file LICENSE, distributed with this software. *
+ ***************************************************************************/
+
+#include "xsimd/utils/bits.hpp"
+
+#include "test_utils.hpp"
+
+TEST_CASE("[utils::make_bit_mask] single bit")
+{
+    CHECK_EQ(xsimd::utils::make_bit_mask<uint8_t>(0), 0x01);
+    CHECK_EQ(xsimd::utils::make_bit_mask<uint8_t>(7), 0x80);
+    CHECK_EQ(xsimd::utils::make_bit_mask<uint32_t>(0), 0x01u);
+    CHECK_EQ(xsimd::utils::make_bit_mask<uint32_t>(31), 0x80000000u);
+    CHECK_EQ(xsimd::utils::make_bit_mask<int32_t>(0), 0x01);
+    CHECK_EQ(xsimd::utils::make_bit_mask<int32_t>(16), 0x00010000);
+}
+
+TEST_CASE("[utils::make_bit_mask] multiple bits")
+{
+    CHECK_EQ(xsimd::utils::make_bit_mask(0, 1), 0b11);
+    CHECK_EQ(xsimd::utils::make_bit_mask<uint8_t>(0, 2, 4), 0b00010101);
+}
+
+TEST_CASE("[utils::all_bits_set] basic")
+{
+    CHECK(xsimd::utils::all_bits_set<0>(0x01));
+    CHECK(xsimd::utils::all_bits_set<7>(0x80));
+    CHECK_FALSE(xsimd::utils::all_bits_set<0>(0x00));
+    CHECK_FALSE(xsimd::utils::all_bits_set<1>(0x01));
+}
+
+TEST_CASE("[utils::all_bits_set] multiple bits")
+{
+    CHECK((xsimd::utils::all_bits_set<0, 1>(0x03)));
+    CHECK((xsimd::utils::all_bits_set<0, 1>(0xFF)));
+    CHECK_FALSE((xsimd::utils::all_bits_set<0, 1>(0x01)));
+}
+
+TEST_CASE("[utils::set_bit]")
+{
+    CHECK_EQ(xsimd::utils::set_bit<0>(0), 0x01);
+    CHECK_EQ(xsimd::utils::set_bit<3>(0), 0x08);
+    // Idempotent: setting an already-set bit
+    CHECK_EQ(xsimd::utils::set_bit<0>(0x01), 0x01);
+    // Does not clear other bits
+    CHECK_EQ(xsimd::utils::set_bit<1>(0b1101), 0b1111);
+}
+
+TEST_CASE("[utils::make_low_mask]")
+{
+    CHECK_EQ(xsimd::utils::make_low_mask<uint8_t>(0), 0x00);
+    CHECK_EQ(xsimd::utils::make_low_mask<uint8_t>(1), 0x01);
+    CHECK_EQ(xsimd::utils::make_low_mask<uint8_t>(4), 0x0F);
+    CHECK_EQ(xsimd::utils::make_low_mask<uint8_t>(7), 0x7F);
+    // Full width
+    CHECK_EQ(xsimd::utils::make_low_mask<uint8_t>(8), 0xFF);
+    CHECK_EQ(xsimd::utils::make_low_mask<uint32_t>(32), 0xFFFFFFFFu);
+    CHECK_EQ(xsimd::utils::make_low_mask<uint64_t>(64), 0xFFFFFFFFFFFFFFFFu);
+}
+
+enum class flag : uint32_t
+{
+    A = 0,
+    B = 1,
+    C = 4,
+    D = 31,
+};
+
+TEST_CASE("[utils::uint_bitset] default construction")
+{
+    xsimd::utils::uint_bitset<flag, uint32_t> bs;
+    CHECK_FALSE(bs.bit_is_set<flag::A>());
+    CHECK_FALSE(bs.bit_is_set<flag::B>());
+}
+
+TEST_CASE("[utils::uint_bitset] construction from raw value")
+{
+    xsimd::utils::uint_bitset<flag, uint32_t> bs(0b11);
+    CHECK(bs.bit_is_set<flag::A>());
+    CHECK(bs.bit_is_set<flag::B>());
+    CHECK_FALSE(bs.bit_is_set<flag::C>());
+}
+
+TEST_CASE("[utils::uint_bitset] set_bit")
+{
+    xsimd::utils::uint_bitset<flag, uint32_t> bs;
+    bs.set_bit<flag::A>();
+    CHECK(bs.bit_is_set<flag::A>());
+    CHECK_FALSE(bs.bit_is_set<flag::B>());
+    bs.set_bit<flag::D>();
+    CHECK(bs.bit_is_set<flag::D>());
+}
+
+TEST_CASE("[utils::uint_bitset] all_bits_set")
+{
+    xsimd::utils::uint_bitset<flag, uint32_t> bs(0b11);
+    CHECK((bs.all_bits_set<flag::A, flag::B>()));
+    CHECK_FALSE((bs.all_bits_set<flag::A, flag::C>()));
+}
+
+TEST_CASE("[utils::uint_bitset] get_range")
+{
+    enum class rk : uint32_t
+    {
+        lo = 0,
+        mid = 4,
+        hi = 8
+    };
+    xsimd::utils::uint_bitset<rk, uint32_t> bs(0b10101011);
+    CHECK_EQ((bs.get_range<rk::lo, rk::mid>()), 0b1011);
+    CHECK_EQ((bs.get_range<rk::mid, rk::hi>()), 0b1010);
+}