[PATCH v2] testsuite: Add test for r11-4123

[Marek Polacek <polacek@redhat.com>]

On Mon, Aug 22, 2022 at 10:16:23AM -0700, Andrew Pinski wrote:
> On Mon, Aug 22, 2022 at 9:58 AM Marek Polacek via Gcc-patches
> <gcc-patches@gcc.gnu.org> wrote:
> >
> > r11-4123 came without a test but I happened upon a nice test case that
> > got fixed by that revision.  So I think it'd be good to add it.  The
> > ICE was:
> >
> > phi-1.C: In constructor 'ElementManager::ElementManager()':
> > phi-1.C:28:1: error: missing definition
> >    28 | ElementManager::ElementManager() : array_(makeArray()) {}
> >       | ^~~~~~~~~~~~~~
> > for SSA_NAME: _12 in statement:
> > _10 = PHI <_12(3), _11(5)>
> > PHI argument
> > _12
> > for PHI node
> > _10 = PHI <_12(3), _11(5)>
> > during GIMPLE pass: fixup_cfg
> > phi-1.C:28:1: internal compiler error: verify_ssa failed
> >
> > Incidentally, do you think it's safe to backport r11-4123 to GCC 8
> > (downstream)?  Thanks.
> >
> > Tested on x86_64-pc-linux-gnu, ok for trunk?
> >
> > gcc/testsuite/ChangeLog:
> >
> >         * g++.dg/tree-ssa/phi-1.C: New test.
> > ---
> >  gcc/testsuite/g++.dg/tree-ssa/phi-1.C | 28 +++++++++++++++++++++++++++
> >  1 file changed, 28 insertions(+)
> >  create mode 100644 gcc/testsuite/g++.dg/tree-ssa/phi-1.C
> >
> > diff --git a/gcc/testsuite/g++.dg/tree-ssa/phi-1.C b/gcc/testsuite/g++.dg/tree-ssa/phi-1.C
> > new file mode 100644
> > index 00000000000..26cade052e3
> > --- /dev/null
> > +++ b/gcc/testsuite/g++.dg/tree-ssa/phi-1.C
> > @@ -0,0 +1,28 @@
> > +// { dg-do compile { target c++11 } }
> > +// { dg-options "-O --param early-inlining-insns=14" }
> 
> It seems better to put it in g++.dg/torture and remove -O part.
> And then it will be tested for more than before.

Sure, I can move it.

> Maybe even just mark makeArray as always_inline/inline and you might
> be able to remove the param also.

I can't, it doesn't reproduce the issue then.

-- >8 --
r11-4123 came without a test but I happened upon a nice test case that
got fixed by that revision.  So I think it'd be good to add it.  The
ICE was:

phi-1.C: In constructor 'ElementManager::ElementManager()':
phi-1.C:28:1: error: missing definition
   28 | ElementManager::ElementManager() : array_(makeArray()) {}
      | ^~~~~~~~~~~~~~
for SSA_NAME: _12 in statement:
_10 = PHI <_12(3), _11(5)>
PHI argument
_12
for PHI node
_10 = PHI <_12(3), _11(5)>
during GIMPLE pass: fixup_cfg
phi-1.C:28:1: internal compiler error: verify_ssa failed

gcc/testsuite/ChangeLog:

	* g++.dg/torture/phi-1.C: New test.
---
 gcc/testsuite/g++.dg/torture/phi-1.C | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 gcc/testsuite/g++.dg/torture/phi-1.C

diff --git a/gcc/testsuite/g++.dg/torture/phi-1.C b/gcc/testsuite/g++.dg/torture/phi-1.C
new file mode 100644
index 00000000000..69fb3d7ba38
--- /dev/null
+++ b/gcc/testsuite/g++.dg/torture/phi-1.C
@@ -0,0 +1,28 @@
+// { dg-do compile { target c++11 } }
+// { dg-options "--param early-inlining-insns=14" }
+
+struct Element;
+template <int _Nm> struct __array_traits { typedef Element _Type[_Nm]; };
+template <int _Nm> struct array {
+  typename __array_traits<_Nm>::_Type _M_elems;
+};
+bool logLevel();
+struct LogCapture {
+  void stream();
+};
+struct Element {
+  Element();
+  long data_;
+};
+using ElementArray = array<6>;
+struct ElementManager {
+  ElementManager();
+  ElementArray array_;
+};
+static ElementArray makeArray() {
+  if (logLevel())
+    LogCapture().stream();
+  ElementArray foo;
+  return foo;
+}
+ElementManager::ElementManager() : array_(makeArray()) {}

base-commit: b6316324fceaef431799a8b386de5cc9881d6898
-- 
2.37.2