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Merge pull request #256 from mwinterb/clang_ms_clz

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Fixed macro redefinition warnings when compiling with clang-cl.
This commit is contained in:
Victor Zverovich 2016-01-06 06:46:17 -08:00
commit 3943803412
1 changed files with 30 additions and 3 deletions
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33
format.h
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@ -75,7 +75,7 @@ typedef __int64 intmax_t;
# define FMT_API # define FMT_API
#endif #endif
#ifdef _MSC_VER #if defined(_MSC_VER)
# include <intrin.h> // _BitScanReverse, _BitScanReverse64 # include <intrin.h> // _BitScanReverse, _BitScanReverse64
namespace fmt { namespace fmt {
@ -84,9 +84,14 @@ namespace internal {
inline uint32_t clz(uint32_t x) { inline uint32_t clz(uint32_t x) {
unsigned long r = 0; unsigned long r = 0;
_BitScanReverse(&r, x); _BitScanReverse(&r, x);
assert(x != 0);
// Static analysis complains about using uninitialized data
// "r", but the only way that can happen is if "x" is 0,
// which the callers guarantee to not happen.
#pragma warning(suppress: 6102)
return 31 - r; return 31 - r;
} }
# define FMT_BUILTIN_CLZ(n) fmt::internal::clz(n)
# ifdef _WIN64 # ifdef _WIN64
# pragma intrinsic(_BitScanReverse64) # pragma intrinsic(_BitScanReverse64)
@ -104,9 +109,14 @@ inline uint32_t clzll(uint64_t x) {
// Scan the low 32 bits. // Scan the low 32 bits.
_BitScanReverse(&r, static_cast<uint32_t>(x)); _BitScanReverse(&r, static_cast<uint32_t>(x));
# endif # endif
assert(x != 0);
// Static analysis complains about using uninitialized data
// "r", but the only way that can happen is if "x" is 0,
// which the callers guarantee to not happen.
#pragma warning(suppress: 6102)
return 63 - r; return 63 - r;
} }
# define FMT_BUILTIN_CLZLL(n) fmt::internal::clzll(n)
} }
} }
#endif #endif
@ -801,6 +811,23 @@ typedef BasicData<> Data;
# define FMT_BUILTIN_CLZLL(n) __builtin_clzll(n) # define FMT_BUILTIN_CLZLL(n) __builtin_clzll(n)
#endif #endif
#if defined(_MSC_VER)
// Some compilers masquerade as both MSVC and GCC-likes or
// 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 !defined(FMT_BUILTIN_CLZ)
# define FMT_BUILTIN_CLZ(n) fmt::internal::clz(n)
#endif
#if !defined(FMT_BUILTIN_CLZLL)
# define FMT_BUILTIN_CLZLL(n) fmt::internal::clzll(n)
#endif
#endif
#ifdef FMT_BUILTIN_CLZLL #ifdef FMT_BUILTIN_CLZLL
// Returns the number of decimal digits in n. Leading zeros are not counted // Returns the number of decimal digits in n. Leading zeros are not counted
// except for n == 0 in which case count_digits returns 1. // except for n == 0 in which case count_digits returns 1.