superfluous TEST instruction
Vladimir.Kozlov at Sun.COM
Mon Mar 22 11:01:15 PDT 2010
You are right, but I talked about "new" cpus :)
Florian Weimer wrote:
> * Vladimir Kozlov:
>> It was filed before we start work in open.
>> Anyway, currently it is not the problem since new x86 cpus fuse
>> test+jcc instructions into one so there is no performance loss,
>> only code size is affected.
> I don't think Core 2s/pre-Nehalem Xeons perform this type of fusion in
> 64 bit mode, only in 32 bit mode.
More information about the hotspot-compiler-dev