Re: [PATCH] ipa-cp: Fix check for exceeding param_ipa_cp_value_list_size (PR 113490)

[Martin Jambor <mjambor@suse.cz>]

Hi,

On Mon, Jan 22 2024, Jan Hubicka wrote:
>> Hi,
>> 
>> When the check for exceeding param_ipa_cp_value_list_size limit was
>> modified to be ignored for generating values from self-recursive
>> calls, it should have been changed from equal to, to equals toor is
>> greater than.  This omission manifests itself as PR 113490.
>> 
>> When I examined the condition I also noticed that the parameter should
>> come from the callee rather than the caller, since the value list is
>> associated with the former and not the latter.  In practice the limit
>> is of course very likely to be the same, but I fixed this aspect of
>> the condition too.  I briefly audited all other uses of opt_for_fn in
>> ipa-cp.cc and all the others looked OK.
>> 
>> Bootstrapped and tested on x86_64-linux.  OK for master?
>> 
>> Thanks,
>> 
>> Martin
>> 
>> 
>> gcc/ChangeLog:
>> 
>> 2024-01-19  Martin Jambor  <mjambor@suse.cz>
>> 
>> 	PR ipa/113490
>> 	* ipa-cp.cc (ipcp_lattice<valtype>::add_value): Bail out if value
>> 	count is equal or greater than the limit.  Use the limit from the
>> 	callee.
>> 
>> gcc/testsuite/ChangeLog:
>> 
>> 2024-01-19  Martin Jambor  <mjambor@suse.cz>
>> 
>> 	PR ipa/113490
>> 	* gcc.dg/ipa/pr113490.c: New test.
> OK,
> thanks!

thank you, I have pushed the following, which has a tweak in the added
test so that it is only run on targets which support the required vectors.

Martin




When the check for exceeding param_ipa_cp_value_list_size limit was
modified to be ignored for generating values from self-recursive
calls, it should have been changed from equal to, to equals to or is
greater than.  This omission manifests itself as PR 113490.

When I examined the condition I also noticed that the parameter should
come from the callee rather than the caller, since the value list is
associated with the former and not the latter.  In practice the limit
is of course very likely to be the same, but I fixed this aspect of
the condition too.  I briefly audited all other uses of opt_for_fn in
ipa-cp.cc and all the others looked OK.

gcc/ChangeLog:

2024-01-19  Martin Jambor  <mjambor@suse.cz>

	PR ipa/113490
	* ipa-cp.cc (ipcp_lattice<valtype>::add_value): Bail out if value
	count is equal or greater than the limit.  Use the limit from the
	callee.

gcc/testsuite/ChangeLog:

2024-01-22  Martin Jambor  <mjambor@suse.cz>

	PR ipa/113490
	* gcc.dg/ipa/pr113490.c: New test.
---
 gcc/ipa-cp.cc                       |  2 +-
 gcc/testsuite/gcc.dg/ipa/pr113490.c | 31 +++++++++++++++++++++++++++++
 2 files changed, 32 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/gcc.dg/ipa/pr113490.c

diff --git a/gcc/ipa-cp.cc b/gcc/ipa-cp.cc
index b1e2a3a829a..e85477df32d 100644
--- a/gcc/ipa-cp.cc
+++ b/gcc/ipa-cp.cc
@@ -2298,7 +2298,7 @@ ipcp_lattice<valtype>::add_value (valtype newval, cgraph_edge *cs,
 	return false;
       }
 
-  if (!same_lat_gen_level && values_count == opt_for_fn (cs->caller->decl,
+  if (!same_lat_gen_level && values_count >= opt_for_fn (cs->callee->decl,
 						param_ipa_cp_value_list_size))
     {
       /* We can only free sources, not the values themselves, because sources
diff --git a/gcc/testsuite/gcc.dg/ipa/pr113490.c b/gcc/testsuite/gcc.dg/ipa/pr113490.c
new file mode 100644
index 00000000000..526e22b3787
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/ipa/pr113490.c
@@ -0,0 +1,31 @@
+/* { dg-do compile { target int128 } } */
+/* { dg-options "-O3 -Wno-psabi"  } */
+
+typedef char A __attribute__((vector_size (64)));
+typedef short B __attribute__((vector_size (64)));
+typedef unsigned C __attribute__((vector_size (64)));
+typedef long D __attribute__((vector_size (64)));
+typedef __int128 E __attribute__((vector_size (64)));
+
+D bar1_D_0;
+E bar4 (A, D);
+
+E
+bar1 (C C_0)
+{
+  C_0 >>= 1;
+  bar4 ((A) C_0, bar1_D_0);
+  bar4 ((A) (E) {~0 }, (D) (A){ ~0 });
+  bar4 ((A) (B) { ~0 }, (D) (C) { ~0 });
+  bar1 ((C) (D)	{ 0, ~0});
+  bar4 ((A) C_0, bar1_D_0);
+  (A) { bar1 ((C) { 7})[5] - C_0[63], bar4 ((A) (D) {~0}, (D) (C) { 0, ~0})[3]};
+}
+
+E
+bar4 (A A_0, D D_0)
+{
+  bar1 ((C) A_0);
+  bar1 ((C) {5});
+  bar1 ((C) D_0);
+}
-- 
2.43.0