[Bug rtl-optimization/78546] [6/7 Regression] wrong code at -O2 and above

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78546

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |mpolacek at gcc dot gnu.org

--- Comment #10 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #9)
> Testing
> 
> diff --git a/gcc/match.pd b/gcc/match.pd
> index 2d4e019..9e5df64 100644
> --- a/gcc/match.pd
> +++ b/gcc/match.pd
> @@ -1216,6 +1216,13 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
>       (if (cst && !TREE_OVERFLOW (cst))
>        (minus { cst; } @0)))))
>  
> +  /* CST - (CST - A) -> CST - A  */

Shouldn't this be just -> -A?