How to forbid register allocator to overlap bewteen DEST and SOURCE

[jiejie_rong@c-sky.com]

Hi,

	GCC seems to overlap register bewteen DEST and SOURCE in different machine mode,

	Is there any target hooks to control this feature ?

	I use <Constraint Modifier> ‘&’ to forbid register allocator to overlap bewteen DEST and SOURCE,

	but there are some redundancy instructions in the result code :(

	Thanks a lot

—Jojo