Rafael Espindola 3d52fe3ef3 call libc memcpy/memset if array size is bigger then threshold.
Coping 100MB array (after a warmup) shows that glibc 2.6.1 implementation on
x86-64 (core 2) is 30% faster (from 0.270917s to 0.188079s)

llvm-svn: 41479
2007-08-27 10:18:20 +00:00
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