[PATCH] [i386] Refine predicate of peephole2 to general_reg_operand. [PR target/101743]

Uros Bizjak ubizjak@gmail.com
Wed Aug 4 09:30:48 GMT 2021


On Wed, Aug 4, 2021 at 5:33 AM liuhongt <hongtao.liu@intel.com> wrote:
>
> Hi:
>   The define_peephole2 which is added by r12-2640-gf7bf03cf69ccb7dc
> should only work on general registers, considering that x86 also
> supports mov instructions between gpr, sse reg, mask reg, limiting the
> peephole2 predicate to general_reg_operand.
>   I failed to contruct a testcase, but I believe that the PR problem
> should be solved by this patch.
>
>   Bootstrapped and regtested on x86_64-linux-gnu{-m32,}.
>   Ok for trunk?
>
> gcc/ChangeLog:
>
>         PR target/101743
>         * config/i386/i386.md (peephole2): Refine predicate from
>         register_operand to general_reg_operand.

OK.

Thanks,
Uros.

> ---
>  gcc/config/i386/i386.md | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
> index 0c23ddb8d1f..51e8b475bca 100644
> --- a/gcc/config/i386/i386.md
> +++ b/gcc/config/i386/i386.md
> @@ -19423,11 +19423,11 @@ (define_peephole2
>  ;; Eliminate a reg-reg mov by inverting the condition of a cmov (#1).
>  ;; mov r0,r1; dec r0; mov r2,r3; cmov r0,r2 -> dec r1; mov r0,r3; cmov r0, r1
>  (define_peephole2
> - [(set (match_operand:SWI248 0 "register_operand")
> -       (match_operand:SWI248 1 "register_operand"))
> + [(set (match_operand:SWI248 0 "general_reg_operand")
> +       (match_operand:SWI248 1 "general_reg_operand"))
>    (parallel [(set (reg FLAGS_REG) (match_operand 5))
>              (set (match_dup 0) (match_operand:SWI248 6))])
> -  (set (match_operand:SWI248 2 "register_operand")
> +  (set (match_operand:SWI248 2 "general_reg_operand")
>         (match_operand:SWI248 3))
>    (set (match_dup 0)
>         (if_then_else:SWI248 (match_operator 4 "ix86_comparison_operator"
> @@ -19455,10 +19455,10 @@ (define_peephole2
>  ;; Eliminate a reg-reg mov by inverting the condition of a cmov (#2).
>  ;; mov r2,r3; mov r0,r1; dec r0; cmov r0,r2 -> dec r1; mov r0,r3; cmov r0, r1
>  (define_peephole2
> - [(set (match_operand:SWI248 2 "register_operand")
> + [(set (match_operand:SWI248 2 "general_reg_operand")
>         (match_operand:SWI248 3))
> -  (set (match_operand:SWI248 0 "register_operand")
> -       (match_operand:SWI248 1 "register_operand"))
> +  (set (match_operand:SWI248 0 "general_reg_operand")
> +       (match_operand:SWI248 1 "general_reg_operand"))
>    (parallel [(set (reg FLAGS_REG) (match_operand 5))
>              (set (match_dup 0) (match_operand:SWI248 6))])
>    (set (match_dup 0)
> --
> 2.27.0
>


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