Load Barrier Assembly

[Thomas Schatzl]

Hi,

On Thu, 2019-04-04 at 09:40 +0200, Aleksey Shipilev wrote:
> On 4/4/19 9:04 AM, Simone Bordet wrote:
> > test %rsi, 0x20(%r15)
> > jne slow_path
> > 
> > 
[...]
> The greater idea to eliminate barrier costs is to use nmethod entry
> barriers to hot-patch the code (e.g. nop them out) eliminating
> barrier overhead altogether. I don't think it was actually tried for
> either G1, Shenandoah or ZGC.
> 

  hasn't been tried but thought about for a long time for G1; also
nmethod barrier functionality is not that recent :)

Thanks,
  Thomas