Re: [Xen-devel] [PATCH v3 2/3] xen/string: Use compiler __builtin_*() where possible

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 12.05.17 at 19:35, <andrew.cooper3@xxxxxxxxxx> wrote:
> The use of -fno-builtin inhibits these automatic transformations.  This causes
> constructs such as strlen("literal") to be evaluated at compile time, and
> certain simple operations to be replaced with repeated string operations.
> 
> To avoid the macro altering the function names, use the method recommended by
> the C specification by enclosing the function name in brackets to avoid the
> macro being expanded.  This means that optimisation opportunities continue to
> work in the rest of the translation unit.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>


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