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Memcpy in assembly tuned for ARM Cortex-M3/Cortex-M4, with tremendous speed-up comparing to C implementation. For aligned copy it is 45% faster in average. For unaligned copy it is up to 8x faster. Tested on Cortex-M3/Cortex-M4 boards and qemu. No regression. OK to newlib trunk? ChangeLog: 2013-06-03 Joey Ye <joey.ye@arm.com> memcpy for armv7m/armv7em. * libc/machine/arm/Makefile.in: Add dependence. * newlib/libc/machine/arm/memcpy-stub.c: Exclude armv7-m/armv7e-m. * newlib/libc/machine/arm/memcpy.S: Include architecture specific implementations. Original file renamed to ... * newlib/libc/machine/arm/memcpy-armv7a.S: ... this. Remove architecture check. * newlib/libc/machine/arm/memcpy-armv7m.S: New.
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