On Thu, 20 Jul 2023 at 10:28, Gerd Hoffmann <kra...@redhat.com> wrote: > > > > > mReservedMemBitmap &= (UINT32)(~MapInfo->ReservedMemBitmap); > > > > > > I'd expect modern compilers optimize that to a single instruction, > > > > You mean something along the lines of > > > > andl %reg, mReservedMemBitmap(%rip) > > > > right? > > Yes. > > > > but > > > yes, it's not guaranteed to happen, the compiler can choose to generate > > > a series of load + and + store instructions instead. > > > > That is sadly all we have on ARM, unless you use LSE atomics, which > > are optional in the architecture so we never use those in EDK2. > > ARM means v7 only or both v7+v8? >
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