This is the mail archive of the gcc@gcc.gnu.org mailing list for the GCC project.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: ARM peephole2 from 2003 never merged, still valid

On Sat, Jun 01, 2019 at 11:41:30PM +0000, Fredrik Hederstierna wrote:
> +(define_peephole2
> +  [(set (match_operand:SI 0 "arm_general_register_operand" "")
> +       (match_operand:SI 1 "arm_general_register_operand" ""))
> +   (set (reg:CC CC_REGNUM)
> +       (compare:CC (match_dup 0) (const_int 0)))]
> +  "TARGET_ARM"
> +  [(parallel [(set (reg:CC CC_REGNUM) (compare:CC (match_dup 1) (const_int 0)))
> +             (set (match_dup 0) (match_dup 1))])]
> +  ""
> +)

Hi Fredrik,

Do you have a testcase for this?  I wonder if it would be better handled
during combine, and what that then tried; or perhaps these opportunities
are created later, making a peephole a more attractive solution.


Segher
Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]