Re: [PATCH 1/3] tree-ssa-sink: do not sink to in front of setjmp

[Florian Weimer <fweimer@redhat.com>]

* Alexander Monakov via Gcc-patches:

> diff --git a/gcc/testsuite/gcc.dg/setjmp-7.c b/gcc/testsuite/gcc.dg/setjmp-7.c
> new file mode 100644
> index 000000000..44b5bcbfa
> --- /dev/null
> +++ b/gcc/testsuite/gcc.dg/setjmp-7.c
> @@ -0,0 +1,13 @@
> +/* { dg-do compile } */
> +/* { dg-options "-O2 -fno-guess-branch-probability -w" } */
> +/* { dg-require-effective-target indirect_jumps } */
> +
> +struct __jmp_buf_tag { };
> +typedef struct __jmp_buf_tag jmp_buf[1];
> +struct globals { jmp_buf listingbuf; };
> +extern struct globals *const ptr_to_globals;
> +void foo()
> +{
> +    if ( _setjmp ( ((*ptr_to_globals).listingbuf )))
> +	;
> +}

Is the implicit declaration of _setjmp important to this test?
Could we declare it explicitly instead?

Thanks,
Florian