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pick better umul_overflow variant based on intptr size

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daan 2019-10-17 09:47:12 -07:00
parent 08d83cc33d
commit 4609537b8a
1 changed files with 5 additions and 2 deletions
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7
include/mimalloc-internal.h
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@ -156,10 +156,13 @@ bool _mi_page_is_valid(mi_page_t* page);
#define MI_MUL_NO_OVERFLOW ((size_t)1 << (4*sizeof(size_t))) // sqrt(SIZE_MAX)
static inline bool mi_mul_overflow(size_t count, size_t size, size_t* total) {
#if __has_builtin(__builtin_umul_overflow) || __GNUC__ >= 5
#if (MI_INTPTR_SIZE == 4)
#include <limits.h> // INT_MAX, LONG_MAX
#if (INTPTR_MAX == INT_MAX)
return __builtin_umul_overflow(count, size, total);
#else
#elif (INTPTR_MAX == LONG_MAX)
return __builtin_umull_overflow(count, size, total);
#else
return __builtin_umulll_overflow(count, size, total);
#endif
#else /* __builtin_umul_overflow is unavailable */
*total = count * size;