[PATCH] powerpc: Optimized strncat for POWER7/PPC64

[Ondřej Bílka]

On Wed, Dec 24, 2014 at 10:17:17AM -0200, Adhemerval Zanella wrote:
> Hi
> 
> The commit 3eb38795dbbbd816 (Simplify strncat) implements a new 
> strncat algorithm that uses strlen, strnlen, and memcpy.  This is 
> faster than POWER7 current implementation, especially for unaligned 
> strings (where POWER7 code uses byte-byte operations).
> 
> This patch removes the assembly implementation and uses a multiarch
> especialization based on default algorithm calling optimized POWER7
> symbols. Benchtests results in attachments (ran on a POWER8 machine).
> 
> Tested on powerpc64 and powerpc64le.
> 
Should be ok, assembly implementation is lot slower in practice as its
rarely called at all and so is unlikely in cache.