RFR(m): 8220351: Cross-modifying code

[Andrew Haley]

On 3/19/19 4:52 PM, Doerr, Martin wrote:
> Not sure if the inline assembler code on x86 necessarily needs a "clobber memory" effect.
> I don't know what a C++ compiler is allowed to do if it doesn't know that the code has some kind of memory effect.

Leave the memory clobber. No memory clobber means that you are telling the
compiler that this operation has no memory effect, which means that the
compiler can move the asm *before* you wrote out the changes to memory.

-- 
Andrew Haley
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
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