why no shortcut operation for comparion on _Complex operands

[Richard Guenther]

On Sun, Mar 25, 2012 at 2:42 PM, Bin.Cheng <amker.cheng@gmail.com> wrote:
> Hi,
> In tree-complex.c's function expand_complex_comparison, gcc just
> expand comparison on complex
> operands into comparisons on inner type, like:
>
>  D.5375_17 = REALPART_EXPR <g2>;
>  D.5376_18 = IMAGPART_EXPR <g2>;
>  g2.1_5 = COMPLEX_EXPR <D.5375_17, D.5376_18>;
>  D.5377_19 = REALPART_EXPR <g3>;
>  D.5378_20 = IMAGPART_EXPR <g3>;
>  g3.2_6 = COMPLEX_EXPR <D.5377_19, D.5378_20>;
>  D.5379_21 = D.5375_17 == D.5377_19;
>  D.5380_22 = D.5376_18 == D.5378_20;
>  D.5381_23 = D.5379_21 & D.5380_22;
>  if (D.5381_23 == 1)
>    goto <bb 3>;
>  else
>    goto <bb 4>;
>
> So is it possible to do shortcut operation for the "&" on the
> real/imag part of complex data?

Sure.  Does the RTL expander not do that for your target?

Richard.

> Thanks
>
> --
> Best Regards.