diff options
| author | Chris Robinson <[email protected]> | 2018-01-27 11:19:59 -0800 |
|---|---|---|
| committer | Chris Robinson <[email protected]> | 2018-01-27 14:34:05 -0800 |
| commit | f76ab02bd4fc13d6648d839374da966ef12201fd (patch) | |
| tree | b049aca85a332f798806443b635438ff8b9febf3 /CMakeLists.txt | |
| parent | 4d392a8b870818662572ff2784e8ebab07714218 (diff) | |
Add a ctz64 fallback using _BitScanForward when available
Diffstat (limited to 'CMakeLists.txt')
| -rw-r--r-- | CMakeLists.txt | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/CMakeLists.txt b/CMakeLists.txt index 8e3ee808..b5c65c55 100644 --- a/CMakeLists.txt +++ b/CMakeLists.txt @@ -494,6 +494,13 @@ IF(HAVE_INTRIN_H) _BitScanForward64(&idx, 1); return idx; }" HAVE_BITSCANFORWARD64_INTRINSIC) + CHECK_C_SOURCE_COMPILES("#include <intrin.h> + int main() + { + unsigned long idx = 0; + _BitScanForward(&idx, 1); + return idx; + }" HAVE_BITSCANFORWARD_INTRINSIC) ENDIF() CHECK_SYMBOL_EXISTS(sysconf unistd.h HAVE_SYSCONF) |