[PR,62015] Clear aggregate values intersection when jump function flag require us to punt

Hi,

this PR revealed that the aggregate value intersection code in IPA-CP
has one more problem in it, namely when jump function flags show that
a PASS_THROUGH jump function cannot be used at all, it must also clear
the intersection when punting.  Fixed thusly.

Bootstrapped and tested on x86_64-linux (so far only on trunk, testing
on branches in progress).  OK for trunk and all the problematic
branches (IIRC both 4.9 and 4.8)?

Thanks,

Martin


2014-09-02  Martin Jambor  <mjambor@suse.cz>
    
    	PR ipa/62015
    	* ipa-cp.c (intersect_aggregates_with_edge): Handle impermissible
    	pass-trough jump functions correctly.
    
testsuite/
    	* g++.dg/ipa/pr62015.C: New test.

On Wed, Sep 3, 2014 at 10:47 AM, Martin Jambor <mjambor@suse.cz> wrote:
> Hi,
>
> this PR revealed that the aggregate value intersection code in IPA-CP
> has one more problem in it, namely when jump function flags show that
> a PASS_THROUGH jump function cannot be used at all, it must also clear
> the intersection when punting.  Fixed thusly.
>
> Bootstrapped and tested on x86_64-linux (so far only on trunk, testing
> on branches in progress).  OK for trunk and all the problematic
> branches (IIRC both 4.9 and 4.8)?

Ok.

Thanks,
Richard.

> Thanks,
>
> Martin
>
>
> 2014-09-02  Martin Jambor  <mjambor@suse.cz>
>
>         PR ipa/62015
>         * ipa-cp.c (intersect_aggregates_with_edge): Handle impermissible
>         pass-trough jump functions correctly.
>
> testsuite/
>         * g++.dg/ipa/pr62015.C: New test.
>
> diff --git a/gcc/ipa-cp.c b/gcc/ipa-cp.c
> index 44d4c9a..afbec25 100644
> --- a/gcc/ipa-cp.c
> +++ b/gcc/ipa-cp.c
> @@ -3048,6 +3048,11 @@ intersect_aggregates_with_edge (struct cgraph_edge *cs, int index,
>                 intersect_with_agg_replacements (cs->caller, src_idx,
>                                                  &inter, 0);
>             }
> +         else
> +           {
> +             inter.release ();
> +             return vNULL;
> +           }
>         }
>        else
>         {
> @@ -3063,6 +3068,11 @@ intersect_aggregates_with_edge (struct cgraph_edge *cs, int index,
>               else
>                 intersect_with_plats (src_plats, &inter, 0);
>             }
> +         else
> +           {
> +             inter.release ();
> +             return vNULL;
> +           }
>         }
>      }
>    else if (jfunc->type == IPA_JF_ANCESTOR
> diff --git a/gcc/testsuite/g++.dg/ipa/pr62015.C b/gcc/testsuite/g++.dg/ipa/pr62015.C
> new file mode 100644
> index 0000000..950b46e
> --- /dev/null
> +++ b/gcc/testsuite/g++.dg/ipa/pr62015.C
> @@ -0,0 +1,55 @@
> +/* { dg-do run } */
> +/* { dg-options "-O3 -std=c++11"  } */
> +
> +
> +extern "C" int printf(const char *fmt, ...);
> +extern "C" void abort(void);
> +
> +struct Side {
> +    enum _Value { Left, Right, Invalid };
> +
> +    constexpr Side() : _value(Invalid) {}
> +    constexpr Side(_Value value) : _value(value) {}
> +    operator _Value() const { return (_Value)_value; }
> +
> +  private:
> +    char _value;
> +};
> +
> +struct A {
> +    void init();
> +    void adjust(Side side, bool final);
> +    void move(Side side);
> +};
> +
> +void A::init()
> +{
> +    adjust(Side::Invalid, false);
> +}
> +
> +static void __attribute__((noinline))
> +check (int v, int final)
> +{
> +    if (v != 0)
> +      abort();
> +}
> +
> +
> +__attribute__((noinline))
> +void A::adjust(Side side, bool final)
> +{
> +  check ((int)side, final);
> +}
> +
> +void A::move(Side side)
> +{
> +    adjust(side, false);
> +    adjust(side, true);
> +}
> +
> +int main()
> +{
> +    A t;
> +    t.move(Side::Left);
> +    return 0;
> +}