Hi,
this patch does not do any functional changes, it merely moves
top-down propagation in the IPA-SRA WPA phase before bottom-up one.
This also meant moving some preliminary checks from the latter to the
former - where they need to be in their own loop over each SCC because
the subsequent one looks at callers.
Currently the propagations are independent (top-down is used for
return value rermoval, bottom-up for parameter removal and splitting)
but subsequent patches will introduce flags about parameters which
should be propagated from callers first and used in splitting. I
separated this change to test ir independently and make those
subsequent patches cleaner.
While at it, I also replaced couple of FOR_EACH_VEC_ELT macros with
C++11 style iteration.
Bootstrapped and tested on x86_64-linux. OK for master?
Thanks,
Martin
gcc/ChangeLog:
2022-11-11 Martin Jambor <mjam...@suse.cz>
* ipa-sra.c (ipa_sra_analysis): Move top-down analysis before
bottom-up analysis. Replace FOR_EACH_VEC_ELT with C++11 iteration.
gcc/testsuite/ChangeLog:
2021-12-14 Martin Jambor <mjam...@suse.cz>
* gcc.dg/ipa/ipa-sra-25.c: New test
---
gcc/ipa-sra.cc | 145 +++++++++++++-------------
gcc/testsuite/gcc.dg/ipa/ipa-sra-25.c | 17 +++
2 files changed, 89 insertions(+), 73 deletions(-)
create mode 100644 gcc/testsuite/gcc.dg/ipa/ipa-sra-25.c
diff --git a/gcc/ipa-sra.cc b/gcc/ipa-sra.cc
index e8a4cd47429..fa5a01ec07c 100644
--- a/gcc/ipa-sra.cc
+++ b/gcc/ipa-sra.cc
@@ -3925,95 +3925,28 @@ ipa_sra_analysis (void)
auto_vec <cgraph_node *, 16> stack;
int node_scc_count = ipa_reduced_postorder (order, true, NULL);
- /* One sweep from callees to callers for parameter removal and splitting. */
- for (int i = 0; i < node_scc_count; i++)
+ /* One sweep from callers to callees for return value removal. */
+ for (int i = node_scc_count - 1; i >= 0 ; i--)
{
cgraph_node *scc_rep = order[i];
vec<cgraph_node *> cycle_nodes = ipa_get_nodes_in_cycle (scc_rep);
- unsigned j;
- /* Preliminary IPA function level checks and first step of parameter
- removal. */
- cgraph_node *v;
- FOR_EACH_VEC_ELT (cycle_nodes, j, v)
+ /* Preliminary IPA function level checks. */
+ for (cgraph_node *v : cycle_nodes)
{
isra_func_summary *ifs = func_sums->get (v);
if (!ifs || !ifs->m_candidate)
continue;
if (!ipa_sra_ipa_function_checks (v)
|| check_all_callers_for_issues (v))
- {
- ifs->zap ();
- continue;
- }
- if (disable_unavailable_parameters (v, ifs))
- continue;
- for (cgraph_edge *cs = v->indirect_calls; cs; cs = cs->next_callee)
- process_edge_to_unknown_caller (cs);
- for (cgraph_edge *cs = v->callees; cs; cs = cs->next_callee)
- if (!ipa_edge_within_scc (cs))
- param_removal_cross_scc_edge (cs);
+ ifs->zap ();
}
- /* Look at edges within the current SCC and propagate used-ness across
- them, pushing onto the stack all notes which might need to be
- revisited. */
- FOR_EACH_VEC_ELT (cycle_nodes, j, v)
- v->call_for_symbol_thunks_and_aliases (propagate_used_to_scc_callers,
- &stack, true);
-
- /* Keep revisiting and pushing until nothing changes. */
- while (!stack.is_empty ())
- {
- cgraph_node *v = stack.pop ();
- isra_func_summary *ifs = func_sums->get (v);
- gcc_checking_assert (ifs && ifs->m_queued);
- ifs->m_queued = false;
-
- v->call_for_symbol_thunks_and_aliases (propagate_used_to_scc_callers,
- &stack, true);
- }
-
- /* Parameter splitting. */
- bool repeat_scc_access_propagation;
- do
- {
- repeat_scc_access_propagation = false;
- FOR_EACH_VEC_ELT (cycle_nodes, j, v)
- {
- isra_func_summary *ifs = func_sums->get (v);
- if (!ifs
- || !ifs->m_candidate
- || vec_safe_is_empty (ifs->m_parameters))
- continue;
- for (cgraph_edge *cs = v->callees; cs; cs = cs->next_callee)
- if (param_splitting_across_edge (cs))
- repeat_scc_access_propagation = true;
- }
- }
- while (repeat_scc_access_propagation);
-
- if (flag_checking)
- FOR_EACH_VEC_ELT (cycle_nodes, j, v)
- verify_splitting_accesses (v, true);
-
- cycle_nodes.release ();
- }
-
- /* One sweep from caller to callees for result removal. */
- for (int i = node_scc_count - 1; i >= 0 ; i--)
- {
- cgraph_node *scc_rep = order[i];
- vec<cgraph_node *> cycle_nodes = ipa_get_nodes_in_cycle (scc_rep);
- unsigned j;
-
- cgraph_node *v;
- FOR_EACH_VEC_ELT (cycle_nodes, j, v)
+ for (cgraph_node *v : cycle_nodes)
{
isra_func_summary *ifs = func_sums->get (v);
if (!ifs || !ifs->m_candidate)
continue;
-
bool return_needed
= (ifs->m_returns_value
&& (!dbg_cnt (ipa_sra_retvalues)
@@ -4048,6 +3981,72 @@ ipa_sra_analysis (void)
cycle_nodes.release ();
}
+ /* One sweep from callees to callers for parameter removal and splitting. */
+ for (int i = 0; i < node_scc_count; i++)
+ {
+ cgraph_node *scc_rep = order[i];
+ vec<cgraph_node *> cycle_nodes = ipa_get_nodes_in_cycle (scc_rep);
+
+ /* First step of parameter removal. */
+ for (cgraph_node *v : cycle_nodes)
+ {
+ isra_func_summary *ifs = func_sums->get (v);
+ if (!ifs || !ifs->m_candidate)
+ continue;
+ if (disable_unavailable_parameters (v, ifs))
+ continue;
+ for (cgraph_edge *cs = v->indirect_calls; cs; cs = cs->next_callee)
+ process_edge_to_unknown_caller (cs);
+ for (cgraph_edge *cs = v->callees; cs; cs = cs->next_callee)
+ if (!ipa_edge_within_scc (cs))
+ param_removal_cross_scc_edge (cs);
+ }
+
+ /* Look at edges within the current SCC and propagate used-ness across
+ them, pushing onto the stack all notes which might need to be
+ revisited. */
+ for (cgraph_node *v : cycle_nodes)
+ v->call_for_symbol_thunks_and_aliases (propagate_used_to_scc_callers,
+ &stack, true);
+
+ /* Keep revisiting and pushing until nothing changes. */
+ while (!stack.is_empty ())
+ {
+ cgraph_node *v = stack.pop ();
+ isra_func_summary *ifs = func_sums->get (v);
+ gcc_checking_assert (ifs && ifs->m_queued);
+ ifs->m_queued = false;
+
+ v->call_for_symbol_thunks_and_aliases (propagate_used_to_scc_callers,
+ &stack, true);
+ }
+
+ /* Parameter splitting. */
+ bool repeat_scc_access_propagation;
+ do
+ {
+ repeat_scc_access_propagation = false;
+ for (cgraph_node *v : cycle_nodes)
+ {
+ isra_func_summary *ifs = func_sums->get (v);
+ if (!ifs
+ || !ifs->m_candidate
+ || vec_safe_is_empty (ifs->m_parameters))
+ continue;
+ for (cgraph_edge *cs = v->callees; cs; cs = cs->next_callee)
+ if (param_splitting_across_edge (cs))
+ repeat_scc_access_propagation = true;
+ }
+ }
+ while (repeat_scc_access_propagation);
+
+ if (flag_checking)
+ for (cgraph_node *v : cycle_nodes)
+ verify_splitting_accesses (v, true);
+
+ cycle_nodes.release ();
+ }
+
ipa_free_postorder_info ();
free (order);
diff --git a/gcc/testsuite/gcc.dg/ipa/ipa-sra-25.c
b/gcc/testsuite/gcc.dg/ipa/ipa-sra-25.c
new file mode 100644
index 00000000000..46fc1a54571
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/ipa/ipa-sra-25.c
@@ -0,0 +1,17 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -Wmaybe-uninitialized -Werror" } */
+
+int cbos();
+static int aos() {
+ cbos();
+ return 0;
+}
+int cbos_ptr;
+long cbos_psize;
+int cbos() {
+ if (cbos_ptr)
+ return aos();
+ if (cbos_psize)
+ return 1;
+ return 0;
+}
--
2.38.0
