[x86,PATCH] Simple performance tuning for SLM.

[Yuri Rumyantsev]

Hi All,

Here is a simple fix which improves SLM performance by avoiding memory
operand in conditional move instructions. Our measurements have shown
significant speedup (~+10%) for routelookup bench from eembc2.0 suite.

Bootstrapping and regression testing were successful for x86-64.

Is it OK for trunk?

ChangeLog:

2013-09-10  Yuri Rumyantsev  <ysrumyan@gmail.com>

* config/i386/x86-tune.def: Turn on X86_TUNE_AVOID_MEM_OPND_FOR_CMOVE
for SLM.
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