superfluous TEST instruction
fweimer at bfk.de
Mon Mar 22 10:19:29 PDT 2010
* 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.
Florian Weimer <fweimer at bfk.de>
BFK edv-consulting GmbH http://www.bfk.de/
Kriegsstraße 100 tel: +49-721-96201-1
D-76133 Karlsruhe fax: +49-721-96201-99
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