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Remove FMT_BUILTIN_CTZ

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This commit is contained in:
Victor Zverovich 2024-10-27 10:18:24 -07:00
parent 27110bc474
commit 7d4662f7ab
1 changed files with 8 additions and 29 deletions
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37
include/fmt/format.h
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@ -185,42 +185,32 @@ FMT_END_NAMESPACE
# endif
#endif
// __builtin_ctz is broken in Intel Compiler Classic on Windows:
// https://github.com/fmtlib/fmt/issues/2510.
#ifndef __ICL
# if FMT_HAS_BUILTIN(__builtin_ctz) || FMT_GCC_VERSION || FMT_ICC_VERSION || \
defined(__NVCOMPILER)
# define FMT_BUILTIN_CTZ(n) __builtin_ctz(n)
# endif
#endif
// Some compilers masquerade as both MSVC and GCC-likes but otherwise support
// Some compilers masquerade as both MSVC and GCC but otherwise support
// __builtin_clz and __builtin_clzll, so only define FMT_BUILTIN_CLZ using the
// MSVC intrinsics if the clz and clzll builtins are not available.
#if FMT_MSC_VERSION && !defined(FMT_BUILTIN_CLZLL)
FMT_BEGIN_NAMESPACE
namespace detail {
// Avoid Clang with Microsoft CodeGen's -Wunknown-pragmas warning.
# if !defined(__clang__)
# pragma intrinsic(_BitScanForward)
# ifndef __clang__
# pragma intrinsic(_BitScanReverse)
# if defined(_WIN64)
# ifdef _WIN64
# pragma intrinsic(_BitScanReverse64)
# endif
# endif
inline auto clz(uint32_t x) -> int {
FMT_ASSERT(x != 0, "");
FMT_MSC_WARNING(suppress : 6102) // Suppress a bogus static analysis warning.
unsigned long r = 0;
_BitScanReverse(&r, x);
FMT_ASSERT(x != 0, "");
// Static analysis complains about using uninitialized data "r", but this can
// only happen if `x` is 0, which the callers guarantee to not happen.
FMT_MSC_WARNING(suppress : 6102)
return 31 ^ static_cast<int>(r);
}
# define FMT_BUILTIN_CLZ(n) detail::clz(n)
inline auto clzll(uint64_t x) -> int {
FMT_ASSERT(x != 0, "");
FMT_MSC_WARNING(suppress : 6102) // Suppress a bogus static analysis warning.
unsigned long r = 0;
# ifdef _WIN64
_BitScanReverse64(&r, x);
@ -231,23 +221,12 @@ inline auto clzll(uint64_t x) -> int {
// Scan the low 32 bits.
_BitScanReverse(&r, static_cast<uint32_t>(x));
# endif
FMT_ASSERT(x != 0, "");
FMT_MSC_WARNING(suppress : 6102) // Suppress a bogus static analysis warning.
return 63 ^ static_cast<int>(r);
}
# define FMT_BUILTIN_CLZLL(n) detail::clzll(n)
inline auto ctz(uint32_t x) -> int {
unsigned long r = 0;
_BitScanForward(&r, x);
FMT_ASSERT(x != 0, "");
FMT_MSC_WARNING(suppress : 6102) // Suppress a bogus static analysis warning.
return static_cast<int>(r);
}
# define FMT_BUILTIN_CTZ(n) detail::ctz(n)
} // namespace detail
FMT_END_NAMESPACE
#endif
#endif // FMT_MSC_VERSION && !defined(FMT_BUILTIN_CLZLL)
FMT_BEGIN_NAMESPACE