organicmaps/fast_double_parser
13
Fork 0
mirror of https://github.com/lemire/fast_double_parser.git synced 2025-04-03 20:04:57 +00:00
Code Issues 1 Projects Releases Wiki Activity Actions

Patch.

Browse source
This commit is contained in:
Daniel Lemire 2021-05-18 14:31:23 -04:00
parent 2cc127528c
commit 70f4b8fac1
1 changed files with 7 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
include/fast_double_parser.h
View file

@ -190,10 +190,10 @@ really_inline value128 full_multiplication(uint64_t value1, uint64_t value2) {
return answer;
}
/* result might be undefined when input_num is zero */
inline int leading_zeroes(uint64_t input_num) {
#ifdef _MSC_VER
#if defined(_M_X64) || defined(_M_ARM64) || defined (_M_IA64)
unsigned long leading_zero = 0;
// Search the mask data from most significant bit (MSB)
// to least significant bit (LSB) for a set bit (1).
@ -201,6 +201,12 @@ inline int leading_zeroes(uint64_t input_num) {
return (int)(63 - leading_zero);
else
return 64;
#else
unsigned long x1 = (unsigned long)(x >> 32), top, bottom;
_BitScanReverse(&top, x1);
_BitScanReverse(&bottom, (unsigned long)x);
return x1 ? top + 32 : bottom;
#endif // defined(_M_X64) || defined(_M_ARM64) || defined (_M_IA64)
#else
return __builtin_clzll(input_num);
#endif // _MSC_VER