diff options
| author | Jia Tan <jiat0218@gmail.com> | 2023-06-28 20:22:38 +0800 |
|---|---|---|
| committer | Lasse Collin <lasse.collin@tukaani.org> | 2023-07-18 14:03:08 +0300 |
| commit | 64ee0caaea06654b28afaee850fb187a11bf9cb2 (patch) | |
| tree | 42f5c4e5604ce40d3cfc10cf0c8dc416f5a9a08b /src/liblzma/common/memcmplen.h | |
| parent | Docs: Add a new section to INSTALL for Tests. (diff) | |
| download | xz-64ee0caaea06654b28afaee850fb187a11bf9cb2.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 '')
| -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); |