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This optimization is extracted from cortex-strings and bionic-ized,
and applied to arm-v7a cpus (a7, a9, a15, a53, denver, krait).
I ran stringbench[1] on ARM Juno, this optimization could outperform
origin C implementation by 77%.
[1] https://android.git.linaro.org/gitweb/platform/external/stringbench.git
Change-Id: I1c3fb0c89ce2b3ee7e44f492367b6caf6db58ccf
Signed-off-by: Yingshiuan Pan <yingshiuan.pan@linaro.org>
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Add an optimized memset that is ~20% faster for cortex-a7 and
cortex-a53.
Add a 32 bit optimized cortex-a53 memcpy that is about ~20% faster
on cached data.
Fix the cortex-a15 __str{cat,cpy}_chk.S, memcpy_base.S to remove
the phony functions, since they aren't needed any more. Then add
a direct include of these for cortex-a53.
Verified the new functions by stepping through all of the major
paths and verifying the backtrace is still correct.
Bug: 22696180
Change-Id: Iec92a3f82d51243cca76c9aff9f35d920ff865ae
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