organicmaps/fast_double_parser
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Merge pull request #56 from lemire/issue49

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Patch for legacy systems
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Daniel Lemire 2021-05-18 14:40:50 -04:00 • committed by GitHub
commit 715cf49f1a
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2 changed files with 10 additions and 4 deletions
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6
.appveyor.yml
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@ -22,9 +22,9 @@ build_script:
- mkdir build
- cd build
- cmake --version
- cmake %CMAKE_ARGS% --parallel ..
- cmake %CMAKE_ARGS% ..
- cmake ..
- cmake --build . --config %Configuration% --verbose --parallel
- cmake --build . --config %Configuration% --verbose
for:
-
@ -33,7 +33,7 @@ for:
- job_name: VS2019ARM
test_script:
- ctest --output-on-failure -C %Configuration% --verbose %CTEST_ARGS% --parallel
- ctest --output-on-failure -C %Configuration% --verbose %CTEST_ARGS%
clone_folder: c:\projects\fast_double_parser

8
include/fast_double_parser.h
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@ -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