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Merge pull request #27969 from famiu/refactor/misc/xctz

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refactor(misc): use MSVC compiler builtin for `xctz()`
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bfredl 2024-03-21 21:29:11 +01:00 committed by GitHub
commit 2289ecd22e
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1 changed files with 8 additions and 0 deletions
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src/nvim/math.c
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@ -4,6 +4,10 @@
#include <stdint.h> #include <stdint.h>
#include <string.h> #include <string.h>
#ifdef _MSC_VER
# include <intrin.h> // Required for _BitScanForward64
#endif
#include "nvim/math.h" #include "nvim/math.h"
#ifdef INCLUDE_GENERATED_DECLARATIONS #ifdef INCLUDE_GENERATED_DECLARATIONS
@ -52,6 +56,10 @@ int xctz(uint64_t x)
// Use compiler builtin if possible. // Use compiler builtin if possible.
#if defined(__clang__) || (defined(__GNUC__) && (__GNUC__ >= 4)) #if defined(__clang__) || (defined(__GNUC__) && (__GNUC__ >= 4))
return __builtin_ctzll(x); return __builtin_ctzll(x);
#elif defined(_MSC_VER)
unsigned long index;
_BitScanForward64(&index, x);
return (int)index;
#else #else
int count = 0; int count = 0;
// Set x's trailing zeroes to ones and zero the rest. // Set x's trailing zeroes to ones and zero the rest.