Re: 3.3 error when inlining

[Michael S. Zick <mszick at goquest dot com>]

On Thursday 12 June 2003 10:16 am, Ulrich Weigand wrote:
> Hello,
>
> when compiling the reduced testcase below with -O3 on gcc 3.3, I'm getting
> the following error message:
>
> scopebug.i: In function `outer':
> scopebug.i:13: error: jump to `label' invalidly jumps into binding contour
>
> With -O2, the testcase compiles fine.  CVS head compiles it without error
> either with -O2 or -O3.
>
> From my reading of the standard, the testcase should be correct C,
> so I guess the 3.3 inliner may get confused about scopes ...
>
Note that the "label" is "if (0)" out - it shouldn't exist - regardless of -O?
Compiling with gcc-2.95 the optimization made is "inner" is a leaf function;
With optimization, "outer" jumps to "inner" (there is no "label")
Without optimization, "outer" calls to "inner" (there is no "label")

So the confusion must be about "dead code removal - take the label
with you when you go" - or prehaps the scope of dead code.

Mike
>
> static void
> inner (int len)
> {
>   {
>     char buf[len];
>
>     if (0)
>       {
>         label:
>           return;
>       }
>
>     goto label;
>   }
> }
>
> void
> outer (int len)
> {
>   inner (len);
> }