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[FuzzerUtil] Partially revert D38481 on FuzzerUtil

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This is because lib/Fuzzer doesn't really depend on llvm infrastucture.
It's not easy to access the llvm hardware_concurrency here.

Differential Reivision: https://reviews.llvm.org/D38481

llvm-svn: 314870
This commit is contained in:
Tim Shen 2017-10-04 01:05:34 +00:00
parent d7b3a5d1ff
commit 8fdf405e3b
1 changed files with 9 additions and 1 deletions
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10
lib/Fuzzer/FuzzerUtil.cpp
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@ -195,7 +195,15 @@ void PrintPC(const char *SymbolizedFMT, const char *FallbackFMT, uintptr_t PC) {
Printf(FallbackFMT, PC);
}
unsigned NumberOfCpuCores() { return hardware_concurrency(); }
unsigned NumberOfCpuCores() {
unsigned N = std::thread::hardware_concurrency();
if (!N) {
Printf("WARNING: std::thread::hardware_concurrency not well defined for "
"your platform. Assuming CPU count of 1.\n");
N = 1;
}
return N;
}
size_t SimpleFastHash(const uint8_t *Data, size_t Size) {
size_t Res = 0;