[PATCH] Use memcpy in memmove when possible

[Maxim Kuvyrkov]

Several architectures, e.g., MIPS, have well-optimized memcpy implementations, which can also be used for either forward or backward direction in memmove.  This patch adds an option for ports to define MEMCPY_OK_FOR_{FWD,BWD}_MEMMOVE macros to make generic memmove use memcpy when safe to do so.

This patch speeds up forward-direction memmove on MIPS by 50%.  Tested with no regressions.

OK to apply?

--
Maxim Kuvyrkov
CodeSourcery / Mentor Graphics


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