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| author | Denis Dzyubenko <denis.dzyubenko@nokia.com> | 2009-10-26 10:41:56 (GMT) |
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| committer | Denis Dzyubenko <denis.dzyubenko@nokia.com> | 2009-10-26 10:41:56 (GMT) |
| commit | 968f7c0e65a293a7d7b9a87601e853894d9794ed (patch) | |
| tree | 3a86b71dd69cf4b759bb20b62c18cfeb02a28ef0 /src/3rdparty/webkit/JavaScriptCore/wtf/RandomNumber.cpp | |
| parent | 3481db791c3b48e28f1a9531b247adf6562edb71 (diff) | |
| parent | e2ef97128c006ac2a5c99c67bb54eebaa3b45720 (diff) | |
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Merge branch '4.6' into 4.6-platform
Diffstat (limited to 'src/3rdparty/webkit/JavaScriptCore/wtf/RandomNumber.cpp')
| -rw-r--r-- | src/3rdparty/webkit/JavaScriptCore/wtf/RandomNumber.cpp | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/src/3rdparty/webkit/JavaScriptCore/wtf/RandomNumber.cpp b/src/3rdparty/webkit/JavaScriptCore/wtf/RandomNumber.cpp index 0e6e208..52fb130 100644 --- a/src/3rdparty/webkit/JavaScriptCore/wtf/RandomNumber.cpp +++ b/src/3rdparty/webkit/JavaScriptCore/wtf/RandomNumber.cpp @@ -82,6 +82,23 @@ double randomNumber() return static_cast<double>(fullRandom)/static_cast<double>(1LL << 53); #elif PLATFORM(WINCE) return genrand_res53(); +#elif PLATFORM(WIN_OS) + uint32_t part1 = rand() & (RAND_MAX - 1); + uint32_t part2 = rand() & (RAND_MAX - 1); + uint32_t part3 = rand() & (RAND_MAX - 1); + uint32_t part4 = rand() & (RAND_MAX - 1); + // rand only provides 15 bits on Win32 + uint64_t fullRandom = part1; + fullRandom <<= 15; + fullRandom |= part2; + fullRandom <<= 15; + fullRandom |= part3; + fullRandom <<= 15; + fullRandom |= part4; + + // Mask off the low 53bits + fullRandom &= (1LL << 53) - 1; + return static_cast<double>(fullRandom)/static_cast<double>(1LL << 53); #else uint32_t part1 = rand() & (RAND_MAX - 1); uint32_t part2 = rand() & (RAND_MAX - 1); |