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Load string scan words with memcpy and use MSVC bit-scan intrinsics

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Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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Niels Lohmann committed 2026-10-09 16:01:48 +02:00
1 parent 43c75bef51
commit 0e729be261
2 files changed
+26 -4
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tests/src/unit-class_lexer.cpp
+7
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@@ -1792,4 +1792,11 @@ TEST_CASE("string scanning kernels")
CHECK(nlohmann::detail::count_trailing_zeros(bit) == k);
CHECK(nlohmann::detail::count_trailing_zeros(bit | (bit << 1u) | 0x8000000000000000u) == k);
}
// eight bytes as a little-endian word, at any alignment
const unsigned char bytes[16] = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0xFF};
CHECK(nlohmann::detail::read_eight_bytes(bytes) == 0x0807060504030201u);
CHECK(nlohmann::detail::read_eight_bytes(bytes + 1) == 0x0908070605040302u);
CHECK(nlohmann::detail::read_eight_bytes(bytes + 8) == 0xFF0F0E0D0C0B0A09u);
CHECK(nlohmann::detail::read_eight_bytes(reinterpret_cast<const char*>(bytes) + 3) == 0x0B0A090807060504u);
}