On 3/23/19 11:46 AM, 钟云德 wrote: > hi, all > I am a new guy work on this GCC Bugzilla, and need some help to review > patch detailed showed on > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83855, thanks! > I'd need to see the machine description you're working with. It may be better to avoid match_dup and instead use a matching constraint. The latter will give the majority of RTL passes more freedom to optimize and the register allocator & reloader will handle forming 2-operand formats (assuming this is what you're trying to accomplish).
jeff
