memory/jemalloc/src/include/msvc_compat/strings.h@b8a032363ba2 (annotated)
memory/jemalloc/src/include/msvc_compat/strings.h
Thu, 22 Jan 2015 13:21:57 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 22 Jan 2015 13:21:57 +0100
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
- permissions
- -rw-r--r--
Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6
| michael@0 | 1 | #ifndef strings_h |
| michael@0 | 2 | #define strings_h |
| michael@0 | 3 | |
| michael@0 | 4 | /* MSVC doesn't define ffs/ffsl. This dummy strings.h header is provided |
| michael@0 | 5 | * for both */ |
| michael@0 | 6 | #include <intrin.h> |
| michael@0 | 7 | #pragma intrinsic(_BitScanForward) |
| michael@0 | 8 | static __forceinline int ffsl(long x) |
| michael@0 | 9 | { |
| michael@0 | 10 | unsigned long i; |
| michael@0 | 11 | |
| michael@0 | 12 | if (_BitScanForward(&i, x)) |
| michael@0 | 13 | return (i + 1); |
| michael@0 | 14 | return (0); |
| michael@0 | 15 | } |
| michael@0 | 16 | |
| michael@0 | 17 | static __forceinline int ffs(int x) |
| michael@0 | 18 | { |
| michael@0 | 19 | |
| michael@0 | 20 | return (ffsl(x)); |
| michael@0 | 21 | } |
| michael@0 | 22 | |
| michael@0 | 23 | #endif |
