Clear the destination buffer updated by the previous run in bench-memcpy.c
and test-memcpy.c to catch the error when the following implementations do
not copy anything.
[BZ #19907]
* benchtests/bench-memcpy.c (do_one_test): Clear the destination
buffer updated by the previous run.
* string/test-memcpy.c (do_one_test): Likewise.
* benchtests/bench-memmove.c (do_one_test): Add a comment.
* string/test-memmove.c (do_one_test): Likewise.
Check wheter the compiler has the option -fno-tree-loop-distribute-patterns
to inhibit loop transformation to library calls and uses it on memset
and memmove default implementation to avoid recursive calls.
* string/test-strlen.c: New file.
* string/test-string.h: New file.
* string/test-strcmp.c: New file.
* string/test-strchr.c: New file.
* string/test-strrchr.c: New file.
* string/test-strcpy.c: New file.
* string/test-stpcpy.c: New file.
* string/test-strncpy.c: New file.
* string/test-stpncpy.c: New file.
* string/test-strpbrk.c: New file.
* string/test-strcspn.c: New file.
* string/test-strspn.c: New file.
* string/test-strcat.c: New file.
* string/test-strncmp.c: New file.
* string/test-memchr.c: New file.
* string/test-memcmp.c: New file.
* string/test-memset.c: New file.
* string/test-memcpy.c: New file.
* string/test-mempcpy.c: New file.
* string/test-memmove.c: New file.
* string/Makefile (strop-tests): New variable.
(tests): Add strop-tests.
(distribute): Add test-string.h.