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* builtins.c (expand_builtin_memset, expand_builtin_memcpy,
expand_builtin_strcpy): Additional arguments TARGET and MODE.
(expand_builtin_bzero, expand_builtin_strcpy,
expand_builtin_strncpy, expand_builtin_bzero): Pass additional
TARGET and MODE parameters to the above functions.
(expand_builtin_memset, expand_builtin_memcpy): Optimize the
case where the LEN parameter is constant zero.
(expand_builtin_memcmp): No longer conditional on
HAVE_cmpstrsi. Take an additional mode parameter. Optimize
the cases where len is either constant zero or one.
Optimize to call to memcpy, even if the memcpy isn't inlined.
(expand_builtin_strncpy): Optimize to call memcpy, even if the
memcpy isn't inlined.
(expand_builtin_strcmp, expand_builtin_strncmp): Always attempt
to optimize to a call to memcmp.
(expand_builtin): expand_builtin_memcmp can always be called,
and pass the required parameters to expand_builtin_memcmp,
expand_builtin_memset, expand_builtin_memcpy and
expand_builtin_strcpy.
* gcc.c-torture/execute/string-opt-14.c: New test case.
* gcc.c-torture/execute/string-opt-15.c: New test case.
From-SVN: r47960
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