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| author | Gunnar Sletta <gunnar@trolltech.com> | 2009-10-23 05:13:34 (GMT) |
|---|---|---|
| committer | Gunnar Sletta <gunnar@trolltech.com> | 2009-10-23 05:13:34 (GMT) |
| commit | aab648826f0a11a93341f29e88c46902d5f31e4d (patch) | |
| tree | 11d26e0f7353c66a92c7af23a67bf32782f19332 /src/3rdparty/webkit/JavaScriptCore/wtf/RandomNumber.cpp | |
| parent | 5de213210ef4f14e698c3fd970cf7e6c5b27c72d (diff) | |
| parent | eeb116b56f9555458438dfe235b16488db9b1494 (diff) | |
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Merge branch '4.6' of git@scm.dev.nokia.troll.no:qt/qt into 4.6
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); |