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| author | Jia Tan <jiat0218@gmail.com> | 2023-06-28 20:22:38 +0800 |
|---|---|---|
| committer | Jia Tan <jiat0218@gmail.com> | 2023-06-28 23:59:51 +0800 |
| commit | e3356a204c5ae02db3ec4552b6c1be354e9b6142 (patch) | |
| tree | 865dfc90da970ac4bf88a5d35bf8f0ef89583208 /src/liblzma/common/memcmplen.h | |
| parent | CI: Add test with -fsanitize=address,undefined. (diff) | |
| download | xz-e3356a204c5ae02db3ec4552b6c1be354e9b6142.tar.xz | |
liblzma: Prevent warning for MSYS2 Windows build.
In lzma_memcmplen(), the <intrin.h> header file is only included if
_MSC_VER and _M_X64 are both defined but _BitScanForward64() was
previously used if _M_X64 was defined. GCC for MSYS2 defines _M_X64 but
not _MSC_VER so _BitScanForward64() was used without including
<intrin.h>.
Now, lzma_memcmplen() will use __builtin_ctzll() for MSYS2 GCC builds as
expected.
Diffstat (limited to 'src/liblzma/common/memcmplen.h')
| -rw-r--r-- | src/liblzma/common/memcmplen.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/src/liblzma/common/memcmplen.h b/src/liblzma/common/memcmplen.h index db3fff60..4392c1cf 100644 --- a/src/liblzma/common/memcmplen.h +++ b/src/liblzma/common/memcmplen.h @@ -69,11 +69,13 @@ lzma_memcmplen(const uint8_t *buf1, const uint8_t *buf2, while (len < limit) { const uint64_t x = read64ne(buf1 + len) - read64ne(buf2 + len); if (x != 0) { -# if defined(_M_X64) // MSVC or Intel C compiler on Windows + // MSVC or Intel C compiler on Windows +# if defined(_M_X64) && defined(_MSC_VER) unsigned long tmp; _BitScanForward64(&tmp, x); len += (uint32_t)tmp >> 3; -# else // GCC, clang, or Intel C compiler + // GCC, clang, or Intel C compiler +# else len += (uint32_t)__builtin_ctzll(x) >> 3; # endif return my_min(len, limit); |