[Bug middle-end/59990] [4.7/4.8/4.9 regression] incorrect memcpy optimization

[ebotcazou at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59990

--- Comment #7 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> If it is ok that thiscase aborts and the #c0 should not, then the bug would
> be in fold-const.c and we should use integral types instead of floating
> point types to fold the copy.  If this testcase shouldn't abort too, then it
> is a target issue, where it should avoid the i387 loads if the result isn't
> used in some arithmetic instruction.

I disagree, using FP types to implement memcpy in the middle-end is a no-no,
i387 isn't the only architecture which can fiddle with FP values.