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

[Martin Jambor]

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  <mjam...@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;
+}