In http://reviews.llvm.org/D8989#173790, @hfinkel wrote:

> GCC, to combine the x86 and PPC options, accepts the keys all, default, div 
> (for both divf and divd), divf, divd, rsqrt (for both rsqrtf and rsqrtd), 
> rsqrtf, rsqrtd, and then these same things with the 'vec-' prefix. '!' is 
> used as the prefix to indicate disabling (not '-' as you have here).
>
> I'm fine with the :<n> syntax extension, but I'd rather use GCC's syntax here 
> as a base for compatibility.


Ok - I missed the f/d shortcut. I wasn't sure if compatibility with GCC (the 
'!') trumped the existing enable/disable (+/-) syntax that we use for target 
features. Let me know if we should keep the +/- for the llc command-line or 
switch that to ! as well.


http://reviews.llvm.org/D8989

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