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scudo: Simplify AtomicOptions::setFillContentsMode. NFCI.

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Differential Revision: https://reviews.llvm.org/D88747
This commit is contained in:
Peter Collingbourne
2020-10-02 10:20:31 -07:00
parent eb55735073
commit a8938f3da3
1 changed files with 5 additions and 7 deletions
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12
compiler-rt/lib/scudo/standalone/options.h
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@@ -54,16 +54,14 @@ public:
}
void setFillContentsMode(FillContentsMode FillContents) {
while (1) {
u32 Opts = atomic_load(&Val, memory_order_relaxed);
u32 NewOpts = Opts;
u32 Opts = atomic_load(&Val, memory_order_relaxed), NewOpts;
do {
NewOpts = Opts;
NewOpts &= ~(3U << static_cast<u32>(OptionBit::FillContents0of2));
NewOpts |= static_cast<u32>(FillContents)
<< static_cast<u32>(OptionBit::FillContents0of2);
if (atomic_compare_exchange_strong(&Val, &Opts, NewOpts,
memory_order_relaxed))
break;
}
} while (!atomic_compare_exchange_strong(&Val, &Opts, NewOpts,
memory_order_relaxed));
}
};