gcc/

	PR rtl-optimization/28634
	* reorg.c (fill_slots_from_thread): Do not assume A + X - X == A
	for floating-point modes unless flag_unsafe_math_optimizations.

gcc/testsuite/
	PR rtl-optimization/28634
	* gcc.c-torture/execute/ieee/pr28634.c: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@116124 138bc75d-0d04-0410-961f-82ee72b054a4